Merge lp:~cjwatson/launchpad/codehosting-breezy into lp:launchpad

[Colin Watson]

Port codehosting to Breezy.

Most of this is relatively mechanical: bzrlib imports become breezy imports, some things move around a little more (mainly to breezy.bzr), bzrdir becomes controldir in many cases, I tightened up some bytes/text handling, and there were a couple of other minor API changes.

Due to problems with subvertpy, codeimport remains on Bazaar for now. This entails some fiddly code to allow Bazaar and Breezy to coexist in the same codebase.

DirectBranchCommit.commit needs a new call to self.transform_preview.fixup_new_roots. I think this may technically have been needed by Bazaar too, since bzrlib.transform._alter_files calls it, but it no longer seems to be possible to get away without it.

We have to explicitly initialize Breezy in lib/lp/codehosting/__init__.py, as otherwise it initializes itself with a terminal-oriented UI, causing some unexpected output to appear in logs.

We have to disable some plugins that are now built into Breezy and likely to cause trouble if invoked, although unfortunately we have no very elegant way to do that. cvs, darcs, email, and mtn are disabled using BRZ_DISABLE_PLUGINS. git requires more work: we can't allow Breezy to even import this until codeimport is also ported, since it requires a newer version of dulwich which is incompatible with bzr-git (and that isn't particularly straightforward to fix), so I ended up stubbing it in sys.modules so that importing it has no effect. Fortunately Breezy currently only imports breezy.git and relies on it to register its own formats, so this crude strategy works.

The hack in scripts/mirror-branch.py to force bzr to use urllib is no longer required: Breezy removed pycurl support.

[Colin Watson (cjwatson)]

Superseded by https://code.launchpad.net/~cjwatson/launchpad/+git/launchpad/+merge/373805.

Unmerged revisions

19054. By Colin Watson on 2019-09-19

Port codehosting to Breezy.

Most of this is relatively mechanical: bzrlib imports become breezy imports,
some things move around a little more (mainly to breezy.bzr), bzrdir becomes
controldir in many cases, I tightened up some bytes/text handling, and there
were a couple of other minor API changes.

Due to problems with subvertpy, codeimport remains on Bazaar for now. This
entails some fiddly code to allow Bazaar and Breezy to coexist in the same
codebase.

DirectBranchCommit.commit needs a new call to
self.transform_preview.fixup_new_roots. I think this may technically have
been needed by Bazaar too, since bzrlib.transform._alter_files calls it, but
it no longer seems to be possible to get away without it.

We have to explicitly initialize Breezy in lib/lp/codehosting/__init__.py,
as otherwise it initializes itself with a terminal-oriented UI, causing some
unexpected output to appear in logs.

We have to disable some plugins that are now built into Breezy and likely to
cause trouble if invoked, although unfortunately we have no very elegant way
to do that. cvs, darcs, email, and mtn are disabled using
BRZ_DISABLE_PLUGINS. git requires more work: we can't allow Breezy to even
import this until codeimport is also ported, since it requires a newer
version of dulwich which is incompatible with bzr-git (and that isn't
particularly straightforward to fix), so I ended up stubbing it in
sys.modules so that importing it has no effect. Fortunately Breezy
currently only imports breezy.git and relies on it to register its own
formats, so this crude strategy works.

The hack in scripts/mirror-branch.py to force bzr to use urllib is no longer
required: Breezy removed pycurl support.

=== modified file 'Makefile'
--- Makefile	2019-05-22 14:57:45 +0000
+++ Makefile	2019-09-19 21:35:23 +0000
@@ -306,10 +306,10 @@
 	memcached,rabbitmq -i $(LPCONFIG)
 
 run_codebrowse: compile
-	BZR_PLUGIN_PATH=bzrplugins $(PY) scripts/start-loggerhead.py
+	BRZ_PLUGIN_PATH=brzplugins $(PY) scripts/start-loggerhead.py
 
 start_codebrowse: compile
-	BZR_PLUGIN_PATH=$(shell pwd)/bzrplugins $(PY) scripts/start-loggerhead.py --daemon
+	BRZ_PLUGIN_PATH=$(shell pwd)/brzplugins $(PY) scripts/start-loggerhead.py --daemon
 
 stop_codebrowse:
 	$(PY) scripts/stop-loggerhead.py

=== added directory 'brzplugins'
=== added symlink 'brzplugins/builder'
=== target is u'../sourcecode/brz-builder/brzbuildrecipe'
=== added symlink 'brzplugins/difftacular'
=== target is u'../sourcecode/difftacular'
=== added symlink 'brzplugins/loom'
=== target is u'../sourcecode/brz-loom'
=== renamed directory 'bzrplugins/lpserve' => 'brzplugins/lpserve'
=== modified file 'brzplugins/lpserve/__init__.py'
--- bzrplugins/lpserve/__init__.py	2012-06-29 08:40:05 +0000
+++ brzplugins/lpserve/__init__.py	2019-09-19 21:35:23 +0000
@@ -28,7 +28,7 @@
 import threading
 import time
 
-from bzrlib import (
+from breezy import (
     commands,
     errors,
     lockdir,
@@ -36,15 +36,15 @@
     trace,
     ui,
     )
-from bzrlib.commands import (
+from breezy.commands import (
     Command,
     register_command,
     )
-from bzrlib.option import (
+from breezy.option import (
     Option,
     RegistryOption,
     )
-from bzrlib.transport import (
+from breezy.transport import (
     get_transport,
     transport_server_registry,
     )
@@ -88,7 +88,7 @@
             type=unicode),
         RegistryOption(
             'protocol', help="Protocol to serve.",
-            lazy_registry=('bzrlib.transport', 'transport_server_registry'),
+            lazy_registry=('breezy.transport', 'transport_server_registry'),
             value_switches=True),
         ]
 
@@ -192,7 +192,7 @@
             that should be reset.
 
             fork-env allows you to supply environment variables such as
-            "BZR_EMAIL: [e-mail]" which will be set in os.environ before
+            "BRZ_EMAIL: [e-mail]" which will be set in os.environ before
             the command is run.
     """
 
@@ -301,9 +301,9 @@
     #       don't know any way to *remove* a function registered via
     #       'atexit()' so if the forking service has some state, we my try to
     #       clean it up incorrectly.
-    #       Note that the bzr script itself uses sys.exitfunc(); os._exit() in
-    #       the 'bzr' main script, as the teardown time of all the python
-    #       state was quite noticeable in real-world runtime. As such, bzrlib
+    #       Note that the brz script itself uses sys.exitfunc(); os._exit() in
+    #       the 'brz' main script, as the teardown time of all the python
+    #       state was quite noticeable in real-world runtime. As such, breezy
     #       should be pretty safe, or it would have been failing for people
     #       already.
     # [Decision #7]
@@ -483,7 +483,7 @@
         os.rmdir(base_path)
 
     def _bind_child_file_descriptors(self, base_path):
-        # Note: by this point bzrlib has opened stderr for logging
+        # Note: by this point breezy has opened stderr for logging
         # (as part of starting the service process in the first place).
         # As such, it has a stream handler that writes to stderr.
         # logging tries to flush and close that, but the file is already
@@ -975,16 +975,16 @@
 # manually, and observe what was expensive to import.  It doesn't seem
 # very easy to get this right automatically.
 libraries_to_preload = [
-    'bzrlib.errors',
-    'bzrlib.repofmt.groupcompress_repo',
-    'bzrlib.repository',
-    'bzrlib.smart',
-    'bzrlib.smart.protocol',
-    'bzrlib.smart.request',
-    'bzrlib.smart.server',
-    'bzrlib.smart.vfs',
-    'bzrlib.transport.local',
-    'bzrlib.transport.readonly',
+    'breezy.bzr.groupcompress_repo',
+    'breezy.bzr.smart',
+    'breezy.bzr.smart.protocol',
+    'breezy.bzr.smart.request',
+    'breezy.bzr.smart.server',
+    'breezy.bzr.smart.vfs',
+    'breezy.errors',
+    'breezy.repository',
+    'breezy.transport.local',
+    'breezy.transport.readonly',
     'lp.codehosting.bzrutils',
     'lp.codehosting.vfs',
     'lp.codehosting.vfs.branchfs',

=== modified file 'brzplugins/lpserve/test_lpserve.py'
--- bzrplugins/lpserve/test_lpserve.py	2018-01-02 10:54:31 +0000
+++ brzplugins/lpserve/test_lpserve.py	2019-09-19 21:35:23 +0000
@@ -11,18 +11,18 @@
 import threading
 import time
 
-from bzrlib import (
+from breezy import (
     errors,
     osutils,
     tests,
     trace,
     )
-from bzrlib.plugins import lpserve
+from breezy.plugins import lpserve
 from testtools import content
 
 from lp.codehosting import (
-    get_bzr_path,
-    get_BZR_PLUGIN_PATH_for_subprocess,
+    get_brz_path,
+    get_BRZ_PLUGIN_PATH_for_subprocess,
     )
 from lp.testing.fakemethod import FakeMethod
 
@@ -187,13 +187,13 @@
         self.assertEnv({}, 'end\n')
 
     def test_one_entries(self):
-        self.assertEnv({'BZR_EMAIL': '[e-mail]'},
-                       'BZR_EMAIL: [e-mail]\n'
+        self.assertEnv({'BRZ_EMAIL': '[e-mail]'},
+                       'BRZ_EMAIL: [e-mail]\n'
                        'end\n')
 
     def test_two_entries(self):
-        self.assertEnv({'BZR_EMAIL': '[e-mail]', 'BAR': 'foo'},
-                       'BZR_EMAIL: [e-mail]\n'
+        self.assertEnv({'BRZ_EMAIL': '[e-mail]', 'BAR': 'foo'},
+                       'BRZ_EMAIL: [e-mail]\n'
                        'BAR: foo\n'
                        'end\n')
 
@@ -201,10 +201,10 @@
         self.assertInvalid('')
 
     def test_invalid_end(self):
-        self.assertInvalid("BZR_EMAIL: [e-mail]\n")
+        self.assertInvalid("BRZ_EMAIL: [e-mail]\n")
 
     def test_invalid_entry(self):
-        self.assertInvalid("BZR_EMAIL [e-mail]\nend\n")
+        self.assertInvalid("BRZ_EMAIL [e-mail]\nend\n")
 
 
 class TestLPForkingService(TestCaseWithLPForkingService):
@@ -238,19 +238,19 @@
     def test_send_fork_env_with_env(self):
         response = self.send_message_to_service(
             'fork-env rocks\n'
-            'BZR_EMAIL: [e-mail]\n'
+            'BRZ_EMAIL: [e-mail]\n'
             'end\n')
         self.assertEqual('ok\nfake forking\n', response)
-        self.assertEqual([(['rocks'], {'BZR_EMAIL': '[e-mail]'})],
+        self.assertEqual([(['rocks'], {'BRZ_EMAIL': '[e-mail]'})],
                          self.service.fork_log)
 
     def test_send_fork_env_slowly(self):
         response = self.send_message_to_service(
             'fork-env rocks\n'
-            'BZR_EMAIL: [e-mail]\n'
+            'BRZ_EMAIL: [e-mail]\n'
             'end\n', one_byte_at_a_time=True)
         self.assertEqual('ok\nfake forking\n', response)
-        self.assertEqual([(['rocks'], {'BZR_EMAIL': '[e-mail]'})],
+        self.assertEqual([(['rocks'], {'BRZ_EMAIL': '[e-mail]'})],
                          self.service.fork_log)
 
     def test_send_incomplete_fork_env_timeout(self):
@@ -258,7 +258,7 @@
         # content
         response = self.send_message_to_service(
             'fork-env rocks\n'
-            'BZR_EMAIL: [e-mail]\n',
+            'BRZ_EMAIL: [e-mail]\n',
             one_byte_at_a_time=True)
         # Note that we *don't* send a final 'end\n'
         self.assertStartsWith(response, 'FAILURE\n')
@@ -315,24 +315,24 @@
     The launchpad infrastructure requires a fair amount of configuration to
     get paths, etc correct. This provides a "start_bzr_subprocess" command
     that has all of those paths appropriately set, but otherwise functions the
-    same as the bzrlib.tests.TestCase version.
+    same as the breezy.tests.TestCase version.
     """
 
     def start_bzr_subprocess(self, process_args, env_changes=None,
                              working_dir=None):
         """Start bzr in a subprocess for testing.
 
-        Copied and modified from `bzrlib.tests.TestCase.start_bzr_subprocess`.
+        Copied and modified from `breezy.tests.TestCase.start_bzr_subprocess`.
         This version removes some of the skipping stuff, some of the
         irrelevant comments (e.g. about win32) and uses Launchpad's own
-        mechanisms for getting the path to 'bzr'.
+        mechanisms for getting the path to 'brz'.
 
         Comments starting with 'LAUNCHPAD' are comments about our
         modifications.
         """
         if env_changes is None:
             env_changes = {}
-        env_changes['BZR_PLUGIN_PATH'] = get_BZR_PLUGIN_PATH_for_subprocess()
+        env_changes['BRZ_PLUGIN_PATH'] = get_BRZ_PLUGIN_PATH_for_subprocess()
         old_env = {}
 
         def cleanup_environment():
@@ -348,12 +348,12 @@
             cwd = osutils.getcwd()
             os.chdir(working_dir)
 
-        # LAUNCHPAD: We can't use self.get_bzr_path(), since it'll find
-        # lib/bzrlib, rather than the path to bin/bzr.
-        bzr_path = get_bzr_path()
+        # LAUNCHPAD: We can't use self.get_brz_path(), since it'll find
+        # lib/breezy, rather than the path to bin/brz.
+        brz_path = get_brz_path()
         try:
             cleanup_environment()
-            command = [bzr_path]
+            command = [brz_path]
             command.extend(process_args)
             process = self._popen(
                 command, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
@@ -464,8 +464,8 @@
         # The service wants to create this file as a socket.
         os.remove(path)
         env_changes = {
-            'BZR_PLUGIN_PATH': lpserve.__path__[0],
-            'BZR_LOG': tempname,
+            'BRZ_PLUGIN_PATH': lpserve.__path__[0],
+            'BRZ_LOG': tempname,
             }
         proc = self._start_subprocess(path, env_changes)
         return proc, path
@@ -579,7 +579,7 @@
 
     def test_fork_respects_env_vars(self):
         path, pid, sock = self.send_fork_request('whoami',
-            env={'BZR_EMAIL': '[e-mail]'})
+            env={'BRZ_EMAIL': '[e-mail]'})
         stdout_content, stderr_content = self.communicate_with_fork(path)
         self.assertEqual('', stderr_content)
         self.assertEqual('[e-mail]\n', stdout_content)

=== removed symlink 'bzrplugins/builder'
=== target was u'../sourcecode/bzr-builder/'
=== removed symlink 'bzrplugins/difftacular'
=== target was u'../sourcecode/difftacular/'
=== removed symlink 'bzrplugins/loom'
=== target was u'../sourcecode/bzr-loom'
=== modified file 'constraints.txt'
--- constraints.txt	2019-08-23 11:40:51 +0000
+++ constraints.txt	2019-09-19 21:35:23 +0000
@@ -233,6 +233,8 @@
 BeautifulSoup==3.2.1
 beautifulsoup4[lxml]==4.7.1
 billiard==3.5.0.5
+bleach==3.1.0
+breezy==3.0.1
 bson==0.3.3
 # lp:~launchpad/bzr/lp
 bzr==2.6.0.lp.4
@@ -241,6 +243,7 @@
 cffi==1.11.2
 Chameleon==2.11
 chardet==3.0.4
+configobj==5.0.6
 constantly==15.1.0
 cookies==2.2.1
 cryptography==2.7
@@ -257,6 +260,7 @@
 enum34==1.1.6
 epydoc==3.0.1
 extras==1.0.0
+fastimport==0.9.8
 feedparser==5.2.1
 feedvalidator==0.0.0DEV-r1049
 fixtures==3.0.0
@@ -381,6 +385,7 @@
 vine==1.1.4
 virtualenv-tools3==2.0.0
 wadllib==1.3.2
+webencodings==0.5.1
 wheel==0.29.0
 wsgiref==0.1.2
 z3c.pt==2.2.3

=== modified file 'lib/launchpad_loggerhead/app.py'
--- lib/launchpad_loggerhead/app.py	2019-06-13 10:14:15 +0000
+++ lib/launchpad_loggerhead/app.py	2019-09-19 21:35:23 +0000
@@ -8,13 +8,13 @@
 import urlparse
 import xmlrpclib
 
-from bzrlib import (
+from breezy import (
     errors,
     lru_cache,
     urlutils,
     )
-from bzrlib.transport import get_transport
-from bzrlib.url_policy_open import open_only_scheme
+from breezy.transport import get_transport
+from breezy.url_policy_open import open_only_scheme
 from loggerhead.apps import (
     favicon_app,
     static_app,

=== modified file 'lib/launchpad_loggerhead/wsgi.py'
--- lib/launchpad_loggerhead/wsgi.py	2018-06-25 09:16:49 +0000
+++ lib/launchpad_loggerhead/wsgi.py	2019-09-19 21:35:23 +0000
@@ -153,16 +153,16 @@
         cfg.update(self.options)
         return cfg
 
-    def _load_bzr_plugins(self):
-        from bzrlib.plugin import load_plugins
+    def _load_brz_plugins(self):
+        from breezy.plugin import load_plugins
         load_plugins()
 
-        import bzrlib.plugins
-        if getattr(bzrlib.plugins, "loom", None) is None:
+        import breezy.plugins
+        if getattr(breezy.plugins, "loom", None) is None:
             log.error("Loom plugin loading failed.")
 
     def load(self):
-        self._load_bzr_plugins()
+        self._load_brz_plugins()
 
         with open(os.path.join(
                 config.root, config.codebrowse.secret_path)) as secret_file:

=== modified file 'lib/lp/app/browser/stringformatter.py'
--- lib/lp/app/browser/stringformatter.py	2016-06-20 21:19:21 +0000
+++ lib/lp/app/browser/stringformatter.py	2019-09-19 21:35:23 +0000
@@ -21,7 +21,7 @@
 import re
 import sys
 
-from bzrlib.patches import hunk_from_header
+from breezy.patches import hunk_from_header
 from lxml import html
 import markdown
 from zope.component import getUtility

=== modified file 'lib/lp/code/browser/bazaar.py'
--- lib/lp/code/browser/bazaar.py	2012-01-01 02:58:52 +0000
+++ lib/lp/code/browser/bazaar.py	2019-09-19 21:35:23 +0000
@@ -12,7 +12,7 @@
 
 from datetime import datetime
 
-import bzrlib
+import breezy
 from zope.component import getUtility
 
 from lp.code.enums import CodeImportReviewStatus
@@ -51,8 +51,8 @@
             review_status=CodeImportReviewStatus.REVIEWED).count()
 
     @property
-    def bzr_version(self):
-        return bzrlib.__version__
+    def brz_version(self):
+        return breezy.__version__
 
     def _precacheViewPermissions(self, branches):
         """Precache the launchpad.View permissions on the branches."""

=== modified file 'lib/lp/code/browser/sourcepackagerecipe.py'
--- lib/lp/code/browser/sourcepackagerecipe.py	2018-07-16 00:49:00 +0000
+++ lib/lp/code/browser/sourcepackagerecipe.py	2019-09-19 21:35:23 +0000
@@ -17,7 +17,7 @@
 
 import itertools
 
-from bzrlib.plugins.builder.recipe import (
+from breezy.plugins.builder.recipe import (
     ForbiddenInstructionError,
     RecipeParseError,
     )

=== modified file 'lib/lp/code/bzr.py'
--- lib/lp/code/bzr.py	2019-06-08 05:06:08 +0000
+++ lib/lp/code/bzr.py	2019-09-19 21:35:23 +0000
@@ -24,53 +24,53 @@
 # Silence lint warning.
 lp.codehosting
 
-from bzrlib.branch import (
+from breezy.branch import UnstackableBranchFormat
+from breezy.bzr.branch import (
     BranchReferenceFormat,
     BzrBranchFormat6,
     BzrBranchFormat7,
     )
-from bzrlib.branchfmt.fullhistory import BzrBranchFormat5
-from bzrlib.bzrdir import (
+from breezy.bzr.bzrdir import (
     BzrDirMetaFormat1,
     BzrDirMetaFormat1Colo,
     )
-from bzrlib.errors import (
+from breezy.bzr.fullhistory import BzrBranchFormat5
+from breezy.bzr.groupcompress_repo import RepositoryFormat2a
+from breezy.bzr.knitpack_repo import (
+    RepositoryFormatKnitPack1,
+    RepositoryFormatKnitPack3,
+    RepositoryFormatKnitPack4,
+    RepositoryFormatKnitPack5,
+    )
+from breezy.bzr.knitrepo import (
+    RepositoryFormatKnit1,
+    RepositoryFormatKnit3,
+    RepositoryFormatKnit4,
+    )
+from breezy.errors import (
     NotStacked,
     NoSuchRevision,
-    UnstackableBranchFormat,
     )
-from bzrlib.plugins.loom.branch import (
+from breezy.plugins.loom.branch import (
     BzrBranchLoomFormat1,
     BzrBranchLoomFormat6,
     )
-from bzrlib.plugins.weave_fmt.branch import BzrBranchFormat4
-from bzrlib.plugins.weave_fmt.bzrdir import (
+from breezy.plugins.weave_fmt.branch import BzrBranchFormat4
+from breezy.plugins.weave_fmt.bzrdir import (
     BzrDirFormat4,
     BzrDirFormat5,
     BzrDirFormat6,
     )
-from bzrlib.plugins.weave_fmt.repository import (
+from breezy.plugins.weave_fmt.repository import (
     RepositoryFormat4,
     RepositoryFormat5,
     RepositoryFormat6,
     RepositoryFormat7,
     )
-from bzrlib.repofmt.groupcompress_repo import RepositoryFormat2a
-from bzrlib.repofmt.knitpack_repo import (
-    RepositoryFormatKnitPack1,
-    RepositoryFormatKnitPack3,
-    RepositoryFormatKnitPack4,
-    RepositoryFormatKnitPack5,
-    )
-from bzrlib.revision import (
+from breezy.revision import (
     is_null,
     NULL_REVISION,
     )
-from bzrlib.repofmt.knitrepo import (
-    RepositoryFormatKnit1,
-    RepositoryFormatKnit3,
-    RepositoryFormatKnit4,
-    )
 from lazr.enum import (
     DBEnumeratedType,
     DBItem,
@@ -305,7 +305,7 @@
 
     :returns: tuple of (ControlFormat, BranchFormat, RepositoryFormat)
     """
-    control_string = bzr_branch.bzrdir._format.get_format_string()
+    control_string = bzr_branch.controldir._format.get_format_string()
     branch_string = bzr_branch._format.get_format_string()
     repository_string = bzr_branch.repository._format.get_format_string()
     return (ControlFormat.get_enum(control_string),

=== modified file 'lib/lp/code/configure.zcml'
--- lib/lp/code/configure.zcml	2019-04-15 11:17:52 +0000
+++ lib/lp/code/configure.zcml	2019-09-19 21:35:23 +0000
@@ -1191,19 +1191,19 @@
        />
   </class>
   <class
-     class="bzrlib.plugins.builder.recipe.BaseRecipeBranch">
+     class="breezy.plugins.builder.recipe.BaseRecipeBranch">
     <allow attributes="name url revspec revid child_branches deb_version __str__" />
   </class>
   <class
-     class="bzrlib.plugins.builder.recipe.RecipeBranch">
+     class="breezy.plugins.builder.recipe.RecipeBranch">
     <allow attributes="name url revspec revid child_branches __str__" />
   </class>
   <class
-     class="bzrlib.plugins.builder.recipe.MergeInstruction">
+     class="breezy.plugins.builder.recipe.MergeInstruction">
     <allow attributes="as_tuple recipe_branch nest_path" />
   </class>
   <class
-     class="bzrlib.plugins.builder.recipe.NestInstruction">
+     class="breezy.plugins.builder.recipe.NestInstruction">
     <allow attributes="as_tuple recipe_branch nest_path" />
   </class>
 

=== modified file 'lib/lp/code/errors.py'
--- lib/lp/code/errors.py	2018-08-17 11:46:36 +0000
+++ lib/lp/code/errors.py	2019-09-19 21:35:23 +0000
@@ -66,7 +66,7 @@
 
 import httplib
 
-from bzrlib.plugins.builder.recipe import RecipeParseError
+from breezy.plugins.builder.recipe import RecipeParseError
 from lazr.restful.declarations import error_status
 
 from lp.app.errors import (

=== modified file 'lib/lp/code/interfaces/branch.py'
--- lib/lp/code/interfaces/branch.py	2019-06-08 05:06:08 +0000
+++ lib/lp/code/interfaces/branch.py	2019-09-19 21:35:23 +0000
@@ -512,7 +512,7 @@
 
         They are ordered with the most recent revision first, and the list
         only contains those in the "leftmost tree", or in other words
-        the revisions that match the revision history from bzrlib for this
+        the revisions that match the revision history from breezy for this
         branch.
 
         The revisions are listed as tuples of (`BranchRevision`, `Revision`).
@@ -719,7 +719,7 @@
         """Construct a URL for this branch in codebrowse.
 
         :param extras: Zero or more path segments that will be joined onto the
-            end of the URL (with `bzrlib.urlutils.join`).
+            end of the URL (with `breezy.urlutils.join`).
         """
 
     browse_source_url = Attribute(
@@ -993,7 +993,7 @@
         :return: tuple of three items.
             1. Ancestry set of bzr revision-ids.
             2. History list of bzr revision-ids. Similar to the result of
-               bzrlib.Branch.revision_history().
+               breezy.Branch.revision_history().
             3. Dictionnary mapping bzr bzr revision-ids to the database ids of
                the corresponding BranchRevision rows for this branch.
         """
@@ -1012,7 +1012,7 @@
         You can only call this if a server returned by `get_ro_server` or
         `get_rw_server` is running.
 
-        :raise bzrlib.url_policy_open.BadUrl: If the branch is stacked
+        :raise breezy.url_policy_open.BadUrl: If the branch is stacked
             on or a reference to an unacceptable URL.
         """
 

=== modified file 'lib/lp/code/interfaces/tests/test_branch.py'
--- lib/lp/code/interfaces/tests/test_branch.py	2011-09-26 07:33:00 +0000
+++ lib/lp/code/interfaces/tests/test_branch.py	2019-09-19 21:35:23 +0000
@@ -5,9 +5,9 @@
 
 __metaclass__ = type
 
-from bzrlib.branch import format_registry as branch_format_registry
-from bzrlib.bzrdir import BzrProber
-from bzrlib.repository import format_registry as repo_format_registry
+from breezy.branch import format_registry as branch_format_registry
+from breezy.bzr import BzrProber
+from breezy.repository import format_registry as repo_format_registry
 
 from lp.code.bzr import (
     BranchFormat,
@@ -27,21 +27,21 @@
     """
 
     def test_control_format_complement(self):
-        self.bzrlib_is_subset(BzrProber.formats.keys(), ControlFormat)
+        self.breezy_is_subset(BzrProber.formats.keys(), ControlFormat)
 
     def test_branch_format_complement(self):
-        self.bzrlib_is_subset(branch_format_registry.keys(), BranchFormat)
+        self.breezy_is_subset(branch_format_registry.keys(), BranchFormat)
 
     def test_repository_format_complement(self):
-        self.bzrlib_is_subset(repo_format_registry.keys(), RepositoryFormat)
+        self.breezy_is_subset(repo_format_registry.keys(), RepositoryFormat)
 
-    def bzrlib_is_subset(self, bzrlib_formats, launchpad_enum):
-        """Ensure the bzr format marker list is a subset of launchpad."""
-        bzrlib_format_strings = set(bzrlib_formats)
+    def breezy_is_subset(self, breezy_formats, launchpad_enum):
+        """Ensure the Breezy format marker list is a subset of Launchpad."""
+        breezy_format_strings = set(breezy_formats)
         launchpad_format_strings = set(format.title for format
                                        in launchpad_enum.items)
         self.assertEqual(
-            set(), bzrlib_format_strings.difference(launchpad_format_strings))
+            set(), breezy_format_strings.difference(launchpad_format_strings))
 
     def test_repositoryDescriptions(self):
         self.checkDescriptions(RepositoryFormat)

=== modified file 'lib/lp/code/mail/codereviewcomment.py'
--- lib/lp/code/mail/codereviewcomment.py	2019-09-13 23:47:20 +0000
+++ lib/lp/code/mail/codereviewcomment.py	2019-09-19 21:35:23 +0000
@@ -10,7 +10,7 @@
     'CodeReviewCommentMailer',
     ]
 
-from bzrlib.patches import BinaryPatch
+from breezy.patches import BinaryPatch
 from zope.component import getUtility
 from zope.security.proxy import removeSecurityProxy
 
@@ -174,9 +174,9 @@
     """Returns a list of correctly formatted comment(s)."""
     comment_lines = []
     if comment is not None:
-        comment_lines.append('')
+        comment_lines.append(b'')
         comment_lines.extend(comment.splitlines())
-        comment_lines.append('')
+        comment_lines.append(b'')
     return comment_lines
 
 
@@ -201,7 +201,7 @@
 
         if isinstance(patch, dict) and 'dirty_head' in patch:
             for line in patch['dirty_head']:
-                dirty_head.append(u'> %s' % line.rstrip('\n'))
+                dirty_head.append(b'> %s' % line.rstrip(b'\n'))
                 line_count += 1  # inc for dirty headers
                 comment = comments.get(str(line_count))
                 if comment:
@@ -213,7 +213,7 @@
         if type(patch) is BinaryPatch:
             if dirty_comment:
                 result_lines.extend(dirty_head)
-                result_lines.append(u'> %s' % str(patch).rstrip('\n'))
+                result_lines.append(b'> %s' % patch.as_bytes().rstrip(b'\n'))
             line_count += 1
             comment = comments.get(str(line_count))
             if comment:
@@ -224,7 +224,7 @@
             line_count += 1  # inc patch headers
             comment = comments.get(str(line_count))
 
-            patch_lines.append('> {0}'.format(ph))
+            patch_lines.append(b'> %s' % ph)
             if comment:
                 patch_lines.extend(format_comment(comment))
                 patch_comment = True
@@ -236,8 +236,7 @@
 
             # add context line (hunk header)
             line_count += 1  # inc hunk context line
-            hunk_lines.append(u'> %s' % hunk.get_header().rstrip('\n').decode(
-                'utf-8', 'replace'))
+            hunk_lines.append(b'> %s' % hunk.get_header().rstrip(b'\n'))
 
             # comment for context line (hunk header)
             comment = comments.get(str(line_count))
@@ -248,11 +247,9 @@
             for hunk_line in hunk.lines:
                 # A single HunkLine can actually represent multiple
                 # lines in the "No newline at end of file" case.
-                hunk_line = str(hunk_line)
-                for line in hunk_line.splitlines():
+                for line in hunk_line.as_bytes().splitlines():
                     line_count += 1  # inc hunk lines
-                    hunk_lines.append(u'> %s' % line.rstrip('\n').decode(
-                        'utf-8', 'replace'))
+                    hunk_lines.append(b'> %s' % line.rstrip(b'\n'))
                     comment = comments.get(str(line_count))
                     if comment:
                         hunk_lines.extend(format_comment(comment))
@@ -270,5 +267,5 @@
         elif dirty_comment:
             result_lines.extend(dirty_head)
 
-    result_text = '\n'.join(result_lines)
+    result_text = b'\n'.join(result_lines).decode('UTF-8', errors='replace')
     return '\n\nDiff comments:\n\n%s\n\n' % result_text

=== modified file 'lib/lp/code/mail/patches.py'
--- lib/lp/code/mail/patches.py	2019-09-13 23:47:20 +0000
+++ lib/lp/code/mail/patches.py	2019-09-19 21:35:23 +0000
@@ -1,4 +1,4 @@
-# This file was partially cloned from bzr-2.6.0-lp-3 (bzrlib.patches) and
+# This file was partially cloned from breezy 3.0.0 (breezy.patches) and
 # customised for LP.
 #
 # Copyright (C) 2005-2010 Aaron Bentley, Canonical Ltd
@@ -20,7 +20,7 @@
 
 from __future__ import absolute_import
 
-from bzrlib.patches import (
+from breezy.patches import (
     binary_files_re,
     hunk_from_header,
     parse_patch,
@@ -50,10 +50,10 @@
     beginning = True
     in_git_patch = False
 
-    dirty_headers = ('=== ', 'diff ', 'index ')
+    dirty_headers = (b'=== ', b'diff ', b'index ')
     for line in iter_lines:
         # preserve bzr modified/added headers and blank lines
-        if line.startswith(dirty_headers) or not line.strip('\n'):
+        if line.startswith(dirty_headers) or not line.strip(b'\n'):
             if len(saved_lines) > 0:
                 if keep_dirty and len(dirty_head) > 0:
                     yield {'saved_lines': saved_lines,
@@ -63,7 +63,7 @@
                     yield saved_lines
                 in_git_patch = False
                 saved_lines = []
-            if line.startswith('diff --git'):
+            if line.startswith(b'diff --git'):
                 in_git_patch = True
             dirty_head.append(line)
             continue
@@ -73,14 +73,14 @@
             # in the patch before the next "diff" header line can do so.
             dirty_head.append(line)
             continue
-        if line.startswith('*** '):
+        if line.startswith(b'*** '):
             continue
-        if line.startswith('#'):
+        if line.startswith(b'#'):
             continue
         elif orig_range > 0:
-            if line.startswith('-') or line.startswith(' '):
+            if line.startswith(b'-') or line.startswith(b' '):
                 orig_range -= 1
-        elif line.startswith('--- ') or regex.match(line):
+        elif line.startswith(b'--- ') or regex.match(line):
             if allow_dirty and beginning:
                 # Patches can have "junk" at the beginning
                 # Stripping junk from the end of patches is handled when we
@@ -95,7 +95,7 @@
                     yield saved_lines
                 in_git_patch = False
             saved_lines = []
-        elif line.startswith('@@'):
+        elif line.startswith(b'@@'):
             hunk = hunk_from_header(line)
             orig_range = hunk.orig_range
         saved_lines.append(line)
@@ -116,12 +116,11 @@
     :kwarg keep_dirty: If True, returns a dict of patches with dirty headers.
         Default False.
     '''
-    patches = []
     for patch_lines in iter_file_patch(iter_lines, allow_dirty, keep_dirty):
         if 'dirty_head' in patch_lines:
-            patches.append({'patch': parse_patch(
-                patch_lines['saved_lines'], allow_dirty),
-                'dirty_head': patch_lines['dirty_head']})
+            yield {
+                'patch': parse_patch(patch_lines['saved_lines'], allow_dirty),
+                'dirty_head': patch_lines['dirty_head'],
+                }
         else:
-            patches.append(parse_patch(patch_lines, allow_dirty))
-    return patches
+            yield parse_patch(patch_lines, allow_dirty)

=== modified file 'lib/lp/code/model/branch.py'
--- lib/lp/code/model/branch.py	2019-06-13 08:54:49 +0000
+++ lib/lp/code/model/branch.py	2019-09-19 21:35:23 +0000
@@ -14,9 +14,9 @@
 import operator
 import os.path
 
-from bzrlib import urlutils
-from bzrlib.revision import NULL_REVISION
-from bzrlib.url_policy_open import open_only_scheme
+from breezy import urlutils
+from breezy.revision import NULL_REVISION
+from breezy.url_policy_open import open_only_scheme
 from lazr.lifecycle.event import ObjectCreatedEvent
 import pytz
 import six

=== modified file 'lib/lp/code/model/branchjob.py'
--- lib/lp/code/model/branchjob.py	2018-03-30 20:42:14 +0000
+++ lib/lp/code/model/branchjob.py	2019-09-19 21:35:23 +0000
@@ -19,20 +19,20 @@
 from StringIO import StringIO
 import tempfile
 
-from bzrlib.branch import Branch as BzrBranch
-from bzrlib.diff import show_diff_trees
-from bzrlib.errors import (
+from breezy.branch import Branch as BzrBranch
+from breezy.diff import show_diff_trees
+from breezy.errors import (
     NoSuchFile,
     NotBranchError,
     )
-from bzrlib.log import (
+from breezy.log import (
     log_formatter,
     show_log,
     )
-from bzrlib.revision import NULL_REVISION
-from bzrlib.revisionspec import RevisionInfo
-from bzrlib.transport import get_transport
-from bzrlib.upgrade import upgrade
+from breezy.revision import NULL_REVISION
+from breezy.revisionspec import RevisionInfo
+from breezy.transport import get_transport
+from breezy.upgrade import upgrade
 from lazr.delegates import delegate_to
 from lazr.enum import (
     DBEnumeratedType,
@@ -533,7 +533,7 @@
         repository = self.bzr_branch.repository
         added_revisions = repository.get_graph().find_unique_ancestors(
             self.last_revision_id, [self.last_scanned_id])
-        # Avoid hitting the database since bzrlib makes it easy to check.
+        # Avoid hitting the database since breezy makes it easy to check.
         # There are possibly more efficient ways to get the mainline
         # revisions, but this is simple and it works.
         history = branch_revision_history(self.bzr_branch)
@@ -625,7 +625,7 @@
         """Determine which revisions were merged by this revision.
 
         :param revision_id: ID of the revision to examine.
-        :param graph: a bzrlib.graph.Graph.
+        :param graph: a breezy.graph.Graph.
         :return: a set of revision IDs.
         """
         parents = graph.get_parent_map([revision_id])[revision_id]
@@ -901,7 +901,7 @@
                             continue
                         file_id, (from_path, to_path) = changed_file[:2]
                         changed_files.append((
-                            to_path, to_tree.get_file_text(file_id)))
+                            to_path, to_tree.get_file_text(to_path)))
             finally:
                 from_tree.unlock()
         finally:

=== modified file 'lib/lp/code/model/branchlookup.py'
--- lib/lp/code/model/branchlookup.py	2015-09-29 15:00:10 +0000
+++ lib/lp/code/model/branchlookup.py	2019-09-19 21:35:23 +0000
@@ -9,7 +9,7 @@
 __all__ = []
 
 
-from bzrlib.urlutils import escape
+from breezy.urlutils import escape
 from lazr.enum import DBItem
 from lazr.uri import (
     InvalidURIError,

=== modified file 'lib/lp/code/model/diff.py'
--- lib/lp/code/model/diff.py	2016-07-01 20:07:09 +0000
+++ lib/lp/code/model/diff.py	2019-09-19 21:35:23 +0000
@@ -16,14 +16,14 @@
 import sys
 from uuid import uuid1
 
-from bzrlib import trace
-from bzrlib.diff import show_diff_trees
-from bzrlib.merge import Merge3Merger
-from bzrlib.patches import (
+from breezy import trace
+from breezy.diff import show_diff_trees
+from breezy.merge import Merge3Merger
+from breezy.patches import (
     parse_patches,
     Patch,
     )
-from bzrlib.plugins.difftacular.generate_diff import diff_ignore_branches
+from breezy.plugins.difftacular.generate_diff import diff_ignore_branches
 from lazr.delegates import delegate_to
 import simplejson
 from sqlobject import (

=== modified file 'lib/lp/code/model/directbranchcommit.py'
--- lib/lp/code/model/directbranchcommit.py	2013-06-20 05:50:00 +0000
+++ lib/lp/code/model/directbranchcommit.py	2019-09-19 21:35:23 +0000
@@ -12,9 +12,9 @@
 
 import os.path
 
-from bzrlib.generate_ids import gen_file_id
-from bzrlib.revision import NULL_REVISION
-from bzrlib.transform import (
+from breezy.bzr.generate_ids import gen_file_id
+from breezy.revision import NULL_REVISION
+from breezy.transform import (
     ROOT_PARENT,
     TransformPreview,
     )
@@ -226,10 +226,11 @@
             if rev_id == NULL_REVISION:
                 if list(self.transform_preview.iter_changes()) == []:
                     return
+            self.transform_preview.fixup_new_roots()
             committer_id = self.getBzrCommitterID()
             # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
             # required to generate the revision-id.
-            with override_environ(BZR_EMAIL=committer_id):
+            with override_environ(BRZ_EMAIL=committer_id):
                 new_rev_id = self.transform_preview.commit(
                     self.bzrbranch, commit_message, self.merge_parents,
                     committer=committer_id)

=== modified file 'lib/lp/code/model/gitrepository.py'
--- lib/lp/code/model/gitrepository.py	2019-09-16 09:05:01 +0000
+++ lib/lp/code/model/gitrepository.py	2019-09-19 21:35:23 +0000
@@ -27,7 +27,7 @@
 from operator import attrgetter
 from urllib import quote_plus
 
-from bzrlib import urlutils
+from breezy import urlutils
 from lazr.enum import DBItem
 from lazr.lifecycle.event import ObjectModifiedEvent
 from lazr.lifecycle.snapshot import Snapshot

=== modified file 'lib/lp/code/model/revision.py'
--- lib/lp/code/model/revision.py	2015-09-28 17:38:45 +0000
+++ lib/lp/code/model/revision.py	2019-09-19 21:35:23 +0000
@@ -16,7 +16,7 @@
     )
 import email
 
-from bzrlib.revision import NULL_REVISION
+from breezy.revision import NULL_REVISION
 import pytz
 from sqlobject import (
     BoolCol,
@@ -322,7 +322,7 @@
         This works around a bug in Python that causes datetime.fromtimestamp
         to raise an exception if it is given a negative, fractional timestamp.
 
-        :param timestamp: A timestamp from a bzrlib.revision.Revision
+        :param timestamp: A timestamp from a breezy.revision.Revision
         :type timestamp: float
 
         :return: A datetime corresponding to the given timestamp.

=== modified file 'lib/lp/code/model/sourcepackagerecipedata.py'
--- lib/lp/code/model/sourcepackagerecipedata.py	2018-07-23 17:15:40 +0000
+++ lib/lp/code/model/sourcepackagerecipedata.py	2019-09-19 21:35:23 +0000
@@ -13,7 +13,7 @@
 
 import re
 
-from bzrlib.plugins.builder.recipe import (
+from breezy.plugins.builder.recipe import (
     BaseRecipeBranch,
     MergeInstruction,
     NestInstruction,

=== modified file 'lib/lp/code/model/tests/test_branch.py'
--- lib/lp/code/model/tests/test_branch.py	2019-06-08 05:06:08 +0000
+++ lib/lp/code/model/tests/test_branch.py	2019-09-19 21:35:23 +0000
@@ -13,10 +13,10 @@
     )
 import json
 
-from bzrlib.branch import Branch
-from bzrlib.bzrdir import BzrDir
-from bzrlib.revision import NULL_REVISION
-from bzrlib.url_policy_open import BadUrl
+from breezy.branch import Branch
+from breezy.bzr.bzrdir import BzrDir
+from breezy.revision import NULL_REVISION
+from breezy.url_policy_open import BadUrl
 from pytz import UTC
 from sqlobject import SQLObjectNotFound
 from storm.exceptions import LostObjectError
@@ -2257,7 +2257,7 @@
     def test_tip_revision_when_no_revisions(self):
         # When a branch has no revisions but does have Bazaar data, its tip
         # revision is None and its last_scanned_id is
-        # bzrlib.revision.NULL_REVISION.
+        # breezy.revision.NULL_REVISION.
         branch = self.factory.makeBranch()
         branch.updateScannedDetails(None, 0)
         self.assertEqual(NULL_REVISION, branch.last_scanned_id)
@@ -3276,7 +3276,7 @@
         db_branch, tree = self.create_branch_and_tree()
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             revid = tree.commit('')
         bzr_branch = db_branch.getBzrBranch()
         self.assertEqual(revid, bzr_branch.last_revision())

=== modified file 'lib/lp/code/model/tests/test_branchjob.py'
--- lib/lp/code/model/tests/test_branchjob.py	2018-03-30 20:42:14 +0000
+++ lib/lp/code/model/tests/test_branchjob.py	2019-09-19 21:35:23 +0000
@@ -11,11 +11,11 @@
 import os
 import shutil
 
-from bzrlib import errors as bzr_errors
-from bzrlib.branch import Branch
-from bzrlib.bzrdir import BzrDir
-from bzrlib.revision import NULL_REVISION
-from bzrlib.transport import get_transport
+from breezy import errors as bzr_errors
+from breezy.branch import Branch
+from breezy.bzr.bzrdir import BzrDir
+from breezy.revision import NULL_REVISION
+from breezy.transport import get_transport
 from fixtures import MockPatch
 import pytz
 from sqlobject import SQLObjectNotFound
@@ -149,7 +149,7 @@
         db_branch, bzr_tree = self.create_branch_and_tree()
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             bzr_tree.commit('First commit', rev_id=b'rev1')
             bzr_tree.commit('Second commit', rev_id=b'rev2')
             bzr_tree.commit('Third commit', rev_id=b'rev3')
@@ -177,7 +177,7 @@
         db_branch, bzr_tree = self.create_branch_and_tree()
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             bzr_tree.commit('First commit', rev_id=b'rev1')
             LaunchpadZopelessLayer.commit()
 
@@ -198,7 +198,7 @@
         private_bug = self.factory.makeBug(
             target=product, information_type=InformationType.USERDATA)
         bug_line = b'https://launchpad.net/bugs/%s fixed' % private_bug.id
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             bzr_tree.commit(
                 'First commit', rev_id=b'rev1', revprops={b'bugs': bug_line})
         job = BranchScanJob.create(db_branch)
@@ -314,7 +314,7 @@
         db_branch, tree = self.create_branch_and_tree()
         branch2 = BzrDir.create_branch_convenience('.')
         tree.branch.set_stacked_on_url(branch2.base)
-        branch2.bzrdir.destroy_branch()
+        branch2.controldir.destroy_branch()
         # Create BranchUpgradeJob manually, because we're trying to upgrade a
         # branch that doesn't need upgrading.
         requester = self.factory.makePerson()
@@ -463,7 +463,7 @@
         try:
             # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
             # required to generate the revision-id.
-            with override_environ(BZR_EMAIL='[e-mail]'):
+            with override_environ(BRZ_EMAIL='[e-mail]'):
                 tree.commit('rev1', rev_id=b'rev1')
                 tree.commit('rev2', rev_id=b'rev2')
                 tree.commit('rev3', rev_id=b'rev3')
@@ -492,7 +492,7 @@
         tree.add_parent_tree_id(b'rev3')
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit('rev3a', rev_id=b'rev3a')
         self.updateDBRevisions(branch, tree.branch, [b'rev3', b'rev3a'])
         job = RevisionsAddedJob.create(branch, 'rev1', 'rev3', '')
@@ -533,7 +533,7 @@
         self.addCleanup(tree.unlock)
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit(
                 'rev1', rev_id=b'rev1', timestamp=1000, timezone=0,
                 committer='J. Random Hacker <[e-mail]>')
@@ -552,14 +552,14 @@
         tree.branch.nick = 'nicholas'
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit('rev1')
-            tree2 = tree.bzrdir.sprout('tree2').open_workingtree()
+            tree2 = tree.controldir.sprout('tree2').open_workingtree()
             tree2.commit('rev2a', rev_id=b'rev2a-id', committer='foo@')
             tree2.commit('rev3', rev_id=b'rev3-id',
                          authors=['bar@', '[e-mail]'])
             tree.merge_from_branch(tree2.branch)
-            tree3 = tree.bzrdir.sprout('tree3').open_workingtree()
+            tree3 = tree.controldir.sprout('tree3').open_workingtree()
             tree3.commit('rev2b', rev_id=b'rev2b-id', committer='qux@')
             tree.merge_from_branch(tree3.branch, force=True)
             if include_ghost:
@@ -808,17 +808,17 @@
         self.useBzrBranches(direct_database=True)
         db_branch, tree = self.create_branch_and_tree()
         first_revision = b'rev-1'
-        tree.bzrdir.root_transport.put_bytes('hello.txt', 'Hello World\n')
+        tree.controldir.root_transport.put_bytes('hello.txt', b'Hello World\n')
         tree.add('hello.txt')
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit(
                 rev_id=first_revision, message="Log message",
                 committer="Joe Bloggs <[e-mail]>",
                 timestamp=1000000000.0, timezone=0)
-            tree.bzrdir.root_transport.put_bytes(
-                'hello.txt', 'Hello World\n\nFoo Bar\n')
+            tree.controldir.root_transport.put_bytes(
+                'hello.txt', b'Hello World\n\nFoo Bar\n')
             second_revision = b'rev-2'
             tree.commit(
                 rev_id=second_revision, message="Extended contents",
@@ -864,7 +864,7 @@
         rev_id = b'rev-1'
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit(
                 rev_id=rev_id, message="Non ASCII: \xe9",
                 committer="Non ASCII: \xed", timestamp=1000000000.0,
@@ -971,8 +971,9 @@
             except IndexError:
                 file_content = self.factory.getUniqueString()
             dname = os.path.dirname(file_name)
-            self.tree.bzrdir.root_transport.clone(dname).create_prefix()
-            self.tree.bzrdir.root_transport.put_bytes(file_name, file_content)
+            self.tree.controldir.root_transport.clone(dname).create_prefix()
+            self.tree.controldir.root_transport.put_bytes(
+                file_name, file_content)
         if len(files) > 0:
             self.tree.smart_add(
                 [self.tree.abspath(file_pair[0]) for file_pair in files])
@@ -980,7 +981,7 @@
             commit_message = self.factory.getUniqueString('commit')
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             revision_id = self.tree.commit(commit_message)
         self.branch.last_scanned_id = revision_id
         self.branch.last_mirrored_id = revision_id
@@ -1076,7 +1077,7 @@
         # An empty POT cannot be uploaded, if if the product series is
         # configured for template import.
         entries = self._runJobWithFile(
-            TranslationsBranchImportMode.IMPORT_TEMPLATES, 'empty.pot', '')
+            TranslationsBranchImportMode.IMPORT_TEMPLATES, 'empty.pot', b'')
         self.assertEqual(entries, [])
 
     def test_upload_hidden_pot(self):
@@ -1103,7 +1104,7 @@
     def test_upload_pot_content(self):
         # The content of the uploaded file is stored in the librarian.
         # The uploader of a POT is the series owner.
-        POT_CONTENT = "pot content\n"
+        POT_CONTENT = b"pot content\n"
         self._runJobWithFile(
             TranslationsBranchImportMode.IMPORT_TEMPLATES,
             'foo.pot', POT_CONTENT)

=== modified file 'lib/lp/code/model/tests/test_branchmergeproposaljobs.py'
--- lib/lp/code/model/tests/test_branchmergeproposaljobs.py	2019-06-20 13:16:35 +0000
+++ lib/lp/code/model/tests/test_branchmergeproposaljobs.py	2019-09-19 21:35:23 +0000
@@ -190,7 +190,7 @@
         target_branch, tree = self.create_branch_and_tree()
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit('test')
         source_branch = self.factory.makeProductBranch(
             product=target_branch.product)
@@ -212,7 +212,7 @@
         tree = self.create_branch_and_tree(db_branch=bmp.target_branch)[1]
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit('Initial commit')
         self.createBzrBranch(bmp.source_branch, tree.branch)
         self.factory.makeRevisionsForBranch(bmp.source_branch, count=1)

=== modified file 'lib/lp/code/model/tests/test_diff.py'
--- lib/lp/code/model/tests/test_diff.py	2017-10-04 01:49:22 +0000
+++ lib/lp/code/model/tests/test_diff.py	2019-09-19 21:35:23 +0000
@@ -12,8 +12,8 @@
 import logging
 from textwrap import dedent
 
-from bzrlib import trace
-from bzrlib.patches import (
+from breezy import trace
+from breezy.patches import (
     InsertLine,
     parse_patches,
     RemoveLine,
@@ -565,7 +565,7 @@
         reload(trace)
         bmp, source_rev_id, target_rev_id = self.createExampleBzrMerge()
         handler = RecordLister()
-        logger = logging.getLogger('bzr')
+        logger = logging.getLogger('brz')
         logger.addHandler(handler)
         try:
             PreviewDiff.fromBranchMergeProposal(bmp)

=== modified file 'lib/lp/code/model/tests/test_gitref.py'
--- lib/lp/code/model/tests/test_gitref.py	2019-05-22 14:57:45 +0000
+++ lib/lp/code/model/tests/test_gitref.py	2019-09-19 21:35:23 +0000
@@ -14,7 +14,7 @@
 import hashlib
 import json
 
-from bzrlib import urlutils
+from breezy import urlutils
 import pytz
 import responses
 from storm.store import Store

=== modified file 'lib/lp/code/model/tests/test_gitrepository.py'
--- lib/lp/code/model/tests/test_gitrepository.py	2019-09-16 09:05:01 +0000
+++ lib/lp/code/model/tests/test_gitrepository.py	2019-09-19 21:35:23 +0000
@@ -16,7 +16,7 @@
 import hashlib
 import json
 
-from bzrlib import urlutils
+from breezy import urlutils
 from fixtures import MockPatch
 from lazr.lifecycle.event import ObjectModifiedEvent
 from pymacaroons import Macaroon

=== modified file 'lib/lp/code/model/tests/test_sourcepackagerecipe.py'
--- lib/lp/code/model/tests/test_sourcepackagerecipe.py	2019-01-25 11:47:20 +0000
+++ lib/lp/code/model/tests/test_sourcepackagerecipe.py	2019-09-19 21:35:23 +0000
@@ -13,7 +13,7 @@
     )
 import textwrap
 
-from bzrlib.plugins.builder.recipe import ForbiddenInstructionError
+from breezy.plugins.builder.recipe import ForbiddenInstructionError
 from pytz import UTC
 from storm.locals import Store
 from testtools.matchers import Equals

=== modified file 'lib/lp/code/scripts/tests/test_scan_branches.py'
--- lib/lp/code/scripts/tests/test_scan_branches.py	2017-09-14 03:59:29 +0000
+++ lib/lp/code/scripts/tests/test_scan_branches.py	2019-09-19 21:35:23 +0000
@@ -39,7 +39,7 @@
         target, target_tree = self.create_branch_and_tree(db_branch=db_branch)
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             target_tree.commit('First commit', rev_id='rev1')
             target_tree.commit('Second commit', rev_id='rev2')
             target_tree.commit('Third commit', rev_id='rev3')

=== modified file 'lib/lp/code/scripts/tests/test_sendbranchmail.py'
--- lib/lp/code/scripts/tests/test_sendbranchmail.py	2013-07-04 07:18:21 +0000
+++ lib/lp/code/scripts/tests/test_sendbranchmail.py	2019-09-19 21:35:23 +0000
@@ -32,12 +32,12 @@
             BranchSubscriptionDiffSize.WHOLEDIFF,
             CodeReviewNotificationLevel.FULL,
             branch.registrant)
-        transport = tree.bzrdir.root_transport
-        transport.put_bytes('foo', 'bar')
+        transport = tree.controldir.root_transport
+        transport.put_bytes('foo', b'bar')
         tree.add('foo')
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit('Added foo.', rev_id='rev1')
         return branch, tree
 
@@ -65,10 +65,10 @@
         """RevisionsAddedJobs are run by sendbranchmail."""
         self.useBzrBranches()
         branch, tree = self.createBranch()
-        tree.bzrdir.root_transport.put_bytes('foo', 'baz')
+        tree.controldir.root_transport.put_bytes('foo', b'baz')
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             tree.commit('Added foo.', rev_id='rev2')
         job = RevisionsAddedJob.create(
             branch, 'rev1', 'rev2', '[e-mail]')

=== modified file 'lib/lp/code/scripts/tests/test_upgrade_branches.py'
--- lib/lp/code/scripts/tests/test_upgrade_branches.py	2013-07-04 06:54:18 +0000
+++ lib/lp/code/scripts/tests/test_upgrade_branches.py	2019-09-19 21:35:23 +0000
@@ -4,7 +4,7 @@
 """Test the upgrade_branches script."""
 
 
-from bzrlib.branch import Branch as BzrBranch
+from breezy.branch import Branch as BzrBranch
 import transaction
 
 from lp.code.model.branch import (

=== modified file 'lib/lp/code/stories/branches/xx-bazaar-home.txt'
--- lib/lp/code/stories/branches/xx-bazaar-home.txt	2019-05-22 14:57:45 +0000
+++ lib/lp/code/stories/branches/xx-bazaar-home.txt	2019-09-19 21:35:23 +0000
@@ -1,15 +1,15 @@
 The Launchpad Code front page
 =============================
 
-First we manually set the Bazaar version, so that this document will not need
-updating when Launchpad upgrades Bazaar.
-
-    >>> import bzrlib
-    >>> bzrlib_version = bzrlib.__version__
-    >>> bzrlib.__version__ = '0.92.0'
-
-
-Check that the Bazaar home page works.
+First we manually set the Breezy version, so that this document will not need
+updating when Launchpad upgrades Breezy.
+
+    >>> import breezy
+    >>> breezy_version = breezy.__version__
+    >>> breezy.__version__ = '3.0.0'
+
+
+Check that the Code home page works.
 
     >>> browser.open('http://code.launchpad.test/')
     >>> footer = find_tag_by_id(browser.contents, 'application-footer')
@@ -18,12 +18,12 @@
     30 branches registered in
     6 projects
     1 imported branches
-    Launchpad uses Bazaar 0.92.0.
-
-
-Restore the original Bazaar version:
-
-    >>> bzrlib.__version__ = bzrlib_version
+    Launchpad uses Breezy 3.0.0.
+
+
+Restore the original Breezy version:
+
+    >>> breezy.__version__ = breezy_version
 
 
 The main code home page now has a subset of the project tag cloud,

=== modified file 'lib/lp/code/stories/webservice/xx-branch.txt'
--- lib/lp/code/stories/webservice/xx-branch.txt	2019-04-16 10:53:13 +0000
+++ lib/lp/code/stories/webservice/xx-branch.txt	2019-09-19 21:35:23 +0000
@@ -3,7 +3,7 @@
 
 Launchpad provides two ways to programmatically interact with your
 branches. You can either interact with the branches themselves using
-`bzrlib`, or you can use Launchpad's webservice APIs to explore
+`breezy`, or you can use Launchpad's webservice APIs to explore
 information about the branches and how they relate to the rest of
 the things on Launchpad.
 

=== modified file 'lib/lp/code/templates/bazaar-index.pt'
--- lib/lp/code/templates/bazaar-index.pt	2012-10-08 02:24:51 +0000
+++ lib/lp/code/templates/bazaar-index.pt	2019-09-19 21:35:23 +0000
@@ -128,8 +128,8 @@
           </a>
         </div>
         <div>
-          Launchpad uses <a href="http://bazaar.canonical.com/">Bazaar</a>
-          <tal:version tal:content="view/bzr_version">2.0</tal:version>.
+          Launchpad uses <a href="https://www.breezy-vcs.org/">Breezy</a>
+          <tal:version tal:content="view/brz_version">3.0.0</tal:version>.
         </div>
       </div>
 

=== modified file 'lib/lp/code/tests/helpers.py'
--- lib/lp/code/tests/helpers.py	2018-09-07 13:43:50 +0000
+++ lib/lp/code/tests/helpers.py	2019-09-19 21:35:23 +0000
@@ -26,7 +26,7 @@
 from difflib import unified_diff
 from itertools import count
 
-from bzrlib.plugins.builder.recipe import RecipeParser
+from breezy.plugins.builder.recipe import RecipeParser
 import fixtures
 import transaction
 from zope.component import getUtility

=== modified file 'lib/lp/code/tests/test_bzr.py'
--- lib/lp/code/tests/test_bzr.py	2018-01-02 16:10:26 +0000
+++ lib/lp/code/tests/test_bzr.py	2019-09-19 21:35:23 +0000
@@ -7,12 +7,13 @@
 
 __metaclass__ = type
 
-from bzrlib.errors import NoSuchRevision
-from bzrlib.revision import NULL_REVISION
-from bzrlib.tests import (
+from breezy.errors import NoSuchRevision
+from breezy.revision import NULL_REVISION
+from breezy.tests import (
     TestCaseInTempDir,
     TestCaseWithTransport,
     )
+import six
 
 from lp.code.bzr import (
     branch_revision_history,
@@ -49,7 +50,7 @@
 
     def test_get_branch_format_2a(self):
         # Test the 2a branch format.
-        branch = self.make_branch('test', '2a')
+        branch = self.make_branch('test', six.ensure_str('2a'))
         formats = get_branch_formats(branch)
         self.assertEqual(ControlFormat.BZR_METADIR_1, formats[0])
         self.assertEqual(BranchFormat.BZR_BRANCH_7, formats[1])
@@ -57,7 +58,7 @@
 
     def test_get_branch_format_1_9(self):
         # Test the 1.9 branch format.
-        branch = self.make_branch('test', '1.9')
+        branch = self.make_branch('test', six.ensure_str('1.9'))
         formats = get_branch_formats(branch)
         self.assertEqual(ControlFormat.BZR_METADIR_1, formats[0])
         self.assertEqual(BranchFormat.BZR_BRANCH_7, formats[1])
@@ -65,7 +66,7 @@
 
     def test_get_branch_format_packs(self):
         # Test the packs branch format.
-        branch = self.make_branch('test', 'pack-0.92')
+        branch = self.make_branch('test', six.ensure_str('pack-0.92'))
         formats = get_branch_formats(branch)
         self.assertEqual(ControlFormat.BZR_METADIR_1, formats[0])
         self.assertEqual(BranchFormat.BZR_BRANCH_6, formats[1])
@@ -73,7 +74,7 @@
 
     def test_get_branch_format_knits(self):
         # Test the knits branch format.
-        branch = self.make_branch('test', 'knit')
+        branch = self.make_branch('test', six.ensure_str('knit'))
         formats = get_branch_formats(branch)
         self.assertEqual(ControlFormat.BZR_METADIR_1, formats[0])
         self.assertEqual(BranchFormat.BZR_BRANCH_5, formats[1])
@@ -89,7 +90,7 @@
 
     def test_some_commits(self):
         branch = self.make_branch('test')
-        tree = branch.bzrdir.create_workingtree()
+        tree = branch.controldir.create_workingtree()
         tree.commit('acommit', rev_id=b'A')
         tree.commit('bcommit', rev_id=b'B')
         tree.commit('ccommit', rev_id=b'C')
@@ -109,7 +110,7 @@
     def test_some(self):
         # Verify ancestors are included.
         branch = self.make_branch('test')
-        tree = branch.bzrdir.create_workingtree()
+        tree = branch.controldir.create_workingtree()
         tree.commit('msg a', rev_id=b'A')
         tree.commit('msg b', rev_id=b'B')
         tree.commit('msg c', rev_id=b'C')
@@ -123,7 +124,7 @@
     def test_children(self):
         # Verify non-mainline children are included.
         branch = self.make_branch('test')
-        tree = branch.bzrdir.create_workingtree()
+        tree = branch.controldir.create_workingtree()
         tree.commit('msg a', rev_id=b'A')
         branch.generate_revision_history(NULL_REVISION)
         tree.set_parent_ids([])

=== modified file 'lib/lp/code/xmlrpc/branch.py'
--- lib/lp/code/xmlrpc/branch.py	2017-05-23 12:42:38 +0000
+++ lib/lp/code/xmlrpc/branch.py	2019-09-19 21:35:23 +0000
@@ -12,7 +12,7 @@
 
 from xmlrpclib import Fault
 
-from bzrlib import urlutils
+from breezy import urlutils
 from zope.component import getUtility
 from zope.interface import (
     implementer,

=== modified file 'lib/lp/code/xmlrpc/codehosting.py'
--- lib/lp/code/xmlrpc/codehosting.py	2018-12-10 13:54:34 +0000
+++ lib/lp/code/xmlrpc/codehosting.py	2019-09-19 21:35:23 +0000
@@ -13,7 +13,7 @@
 
 import datetime
 
-from bzrlib.urlutils import (
+from breezy.urlutils import (
     escape,
     unescape,
     )

=== modified file 'lib/lp/code/xmlrpc/tests/test_branch.py'
--- lib/lp/code/xmlrpc/tests/test_branch.py	2019-05-22 14:57:45 +0000
+++ lib/lp/code/xmlrpc/tests/test_branch.py	2019-09-19 21:35:23 +0000
@@ -8,7 +8,7 @@
 import os
 import xmlrpclib
 
-from bzrlib import urlutils
+from breezy import urlutils
 from lazr.uri import URI
 from zope.security.proxy import removeSecurityProxy
 

=== modified file 'lib/lp/code/xmlrpc/tests/test_codehosting.py'
--- lib/lp/code/xmlrpc/tests/test_codehosting.py	2019-05-22 14:57:45 +0000
+++ lib/lp/code/xmlrpc/tests/test_codehosting.py	2019-09-19 21:35:23 +0000
@@ -8,8 +8,8 @@
 import datetime
 import os
 
-from bzrlib import bzrdir
-from bzrlib.urlutils import escape
+from breezy import controldir
+from breezy.urlutils import escape
 import pytz
 from testscenarios import (
     load_tests_apply_scenarios,
@@ -659,7 +659,7 @@
             branch, 'next_mirror_time', UTC_NOW)
 
     def getFormatStringsForFormatName(self, format_name):
-        default_format = bzrdir.format_registry.get(format_name)()
+        default_format = controldir.format_registry.get(format_name)()
         control_string = default_format.get_format_string()
         branch_string = default_format.get_branch_format().get_format_string()
         repository_string = \

=== modified file 'lib/lp/codehosting/__init__.py'
--- lib/lp/codehosting/__init__.py	2017-12-19 12:32:57 +0000
+++ lib/lp/codehosting/__init__.py	2019-09-19 21:35:23 +0000
@@ -9,16 +9,21 @@
 
 __metaclass__ = type
 __all__ = [
-    'get_bzr_path',
+    'get_brz_path',
     'get_BZR_PLUGIN_PATH_for_subprocess',
     ]
 
 
 import os
 
-import bzrlib
-from bzrlib.branch import Branch
-from bzrlib.plugin import load_plugins
+import breezy
+from breezy import ui as brz_ui
+from breezy.branch import Branch
+from breezy.library_state import BzrLibraryState as BrzLibraryState
+from breezy.plugin import load_plugins as brz_load_plugins
+# This import is needed so that brz's logger gets registered.
+import breezy.trace
+from bzrlib.plugin import load_plugins as bzr_load_plugins
 # This import is needed so that bzr's logger gets registered.
 import bzrlib.trace
 from zope.security import checker
@@ -26,9 +31,9 @@
 from lp.services.config import config
 
 
-def get_bzr_path():
-    """Find the path to the copy of Bazaar for this rocketfuel instance"""
-    return os.path.join(config.root, 'bin', 'bzr')
+def get_brz_path():
+    """Find the path to the copy of Breezy for this rocketfuel instance"""
+    return os.path.join(config.root, 'bin', 'brz')
 
 
 def _get_bzr_plugins_path():
@@ -48,23 +53,50 @@
     return ":".join((_get_bzr_plugins_path(), "-site"))
 
 
+def _get_brz_plugins_path():
+    """Find the path to the Breezy plugins for this rocketfuel instance."""
+    return os.path.join(config.root, 'brzplugins')
+
+
+def get_BRZ_PLUGIN_PATH_for_subprocess():
+    """Calculate the appropriate value for the BRZ_PLUGIN_PATH environment.
+
+    The '-site' token tells breezy not to include the 'site specific plugins
+    directory' (which is usually something like
+    /usr/lib/pythonX.Y/dist-packages/breezy/plugins/) in the plugin search
+    path, which would be inappropriate for Launchpad, which may have an
+    incompatible version of breezy in its virtualenv.
+    """
+    return ":".join((_get_brz_plugins_path(), "-site"))
+
+
+# We must explicitly initialize Breezy, as otherwise it will initialize
+# itself with a terminal-oriented UI.
+if breezy._global_state is None:
+    brz_state = BrzLibraryState(
+        ui=brz_ui.SilentUIFactory(), trace=breezy.trace.Config())
+    brz_state._start()
+
+
+# XXX cjwatson 2019-06-13: Remove BZR_PLUGIN_PATH and supporting code once
+# all of Launchpad has been ported to Breezy.
 os.environ['BZR_PLUGIN_PATH'] = get_BZR_PLUGIN_PATH_for_subprocess()
+os.environ['BRZ_PLUGIN_PATH'] = get_BRZ_PLUGIN_PATH_for_subprocess()
+
+# Disable some Breezy plugins that are likely to cause trouble if used on
+# the server.  (Unfortunately there doesn't seem to be a good way to load
+# only explicitly-specified plugins at the moment.)
+os.environ['BRZ_DISABLE_PLUGINS'] = ':'.join([
+    'cvs',
+    'darcs',
+    'email',
+    'mtn',
+    ])
 
 # We want to have full access to Launchpad's Bazaar plugins throughout the
 # codehosting package.
-load_plugins([_get_bzr_plugins_path()])
-
-
-def load_bundled_plugin(plugin_name):
-    """Load a plugin bundled with Bazaar."""
-    from bzrlib.plugin import get_core_plugin_path
-    from bzrlib import plugins
-    if get_core_plugin_path() not in plugins.__path__:
-        plugins.__path__.append(get_core_plugin_path())
-    __import__("bzrlib.plugins.%s" % plugin_name)
-
-
-load_bundled_plugin("weave_fmt")
+bzr_load_plugins([_get_bzr_plugins_path()])
+brz_load_plugins()
 
 
 def dont_wrap_class_and_subclasses(cls):
@@ -75,6 +107,6 @@
 
 # Don't wrap Branch or its subclasses in Zope security proxies.  Make sure
 # the various LoomBranch classes are present first.
-import bzrlib.plugins.loom.branch
-bzrlib.plugins.loom.branch
+import breezy.plugins.loom.branch
+breezy.plugins.loom.branch
 dont_wrap_class_and_subclasses(Branch)

=== modified file 'lib/lp/codehosting/bzrutils.py'
--- lib/lp/codehosting/bzrutils.py	2015-07-10 06:06:59 +0000
+++ lib/lp/codehosting/bzrutils.py	2019-09-19 21:35:23 +0000
@@ -1,10 +1,10 @@
 # Copyright 2009 Canonical Ltd.  This software is licensed under the
 # GNU Affero General Public License version 3 (see the file LICENSE).
 
-"""Utilities for dealing with Bazaar.
+"""Utilities for dealing with Breezy.
 
 Much of the code in here should be submitted upstream. The rest is code that
-integrates between Bazaar's infrastructure and Launchpad's infrastructure.
+integrates between Breezy's infrastructure and Launchpad's infrastructure.
 """
 
 __metaclass__ = type
@@ -28,30 +28,30 @@
 import os
 import sys
 
-from bzrlib import (
+from breezy import (
     config,
     trace,
     )
-from bzrlib.errors import (
+from breezy.branch import UnstackableBranchFormat
+from breezy.bzr.remote import (
+    RemoteBranch,
+    RemoteBzrDir,
+    RemoteRepository,
+    )
+from breezy.errors import (
     AppendRevisionsOnlyViolation,
     ConnectionTimeout,
     GhostRevisionsHaveNoRevno,
     NotStacked,
-    UnstackableBranchFormat,
     UnstackableRepositoryFormat,
     UnsupportedProtocol,
     )
-from bzrlib.remote import (
-    RemoteBranch,
-    RemoteBzrDir,
-    RemoteRepository,
-    )
-from bzrlib.transport import (
+from breezy.transport import (
     get_transport,
     register_transport,
     unregister_transport,
     )
-from bzrlib.transport.local import LocalTransport
+from breezy.transport.local import LocalTransport
 from lazr.uri import URI
 
 from lp.services.webapp.errorlog import (
@@ -221,7 +221,7 @@
     """A LocalTransport that works using http URLs.
 
     We have this because the Launchpad database has constraints on URLs for
-    branches, disallowing file:/// URLs. bzrlib itself disallows
+    branches, disallowing file:/// URLs. breezy itself disallows
     file://localhost/ URLs.
     """
 
@@ -287,7 +287,7 @@
     if isinstance(repository, RemoteRepository):
         repository._ensure_real()
         repository = repository._real_repository
-    bzrdir = branch.bzrdir
+    bzrdir = branch.controldir
     if isinstance(bzrdir, RemoteBzrDir):
         bzrdir._ensure_real()
         bzrdir = bzrdir._real_bzrdir
@@ -325,7 +325,7 @@
     # XXX: Aaron Bentley 2008-06-13
     # Bazaar does not provide a public API for learning about
     # format markers.  Fix this in Bazaar, then here.
-    info['control_string'] = branch.bzrdir._format.get_format_string()
+    info['control_string'] = branch.controldir._format.get_format_string()
     info['branch_string'] = branch._format.get_format_string()
     info['repository_string'] = branch.repository._format.get_format_string()
     return info

=== modified file 'lib/lp/codehosting/codeimport/tests/test_worker.py'
--- lib/lp/codehosting/codeimport/tests/test_worker.py	2019-07-09 11:42:39 +0000
+++ lib/lp/codehosting/codeimport/tests/test_worker.py	2019-09-19 21:35:23 +0000
@@ -438,7 +438,7 @@
         remote_name = '%08x.tar.gz' % (source_details.target_id,)
         local_name = '%s.tar.gz' % (self.factory.getUniqueString(),)
         transport = self.get_transport()
-        transport.put_bytes(remote_name, '')
+        transport.put_bytes(remote_name, b'')
         store = ImportDataStore(transport, source_details)
         ret = store.fetch(local_name)
         self.assertTrue(ret)
@@ -496,7 +496,7 @@
         local_name = '%s.tar.gz' % (self.factory.getUniqueString(),)
         subdir_name = self.factory.getUniqueString()
         source_details = self.factory.makeCodeImportSourceDetails()
-        get_transport('.').put_bytes(local_name, '')
+        get_transport('.').put_bytes(local_name, b'')
         transport = self.get_transport()
         store = ImportDataStore(transport.clone(subdir_name), source_details)
         store.put(local_name)

=== modified file 'lib/lp/codehosting/inmemory.py'
--- lib/lp/codehosting/inmemory.py	2018-12-10 13:54:34 +0000
+++ lib/lp/codehosting/inmemory.py	2019-09-19 21:35:23 +0000
@@ -12,7 +12,7 @@
 import operator
 from xmlrpclib import Fault
 
-from bzrlib.urlutils import (
+from breezy.urlutils import (
     escape,
     unescape,
     )

=== modified file 'lib/lp/codehosting/puller/scheduler.py'
--- lib/lp/codehosting/puller/scheduler.py	2013-01-07 02:40:55 +0000
+++ lib/lp/codehosting/puller/scheduler.py	2019-09-19 21:35:23 +0000
@@ -320,7 +320,7 @@
             self.default_stacked_on_url]
         self.logger.debug("executing %s", command)
         env = os.environ.copy()
-        env['BZR_EMAIL'] = get_lock_id_for_branch_id(self.branch_id)
+        env['BRZ_EMAIL'] = get_lock_id_for_branch_id(self.branch_id)
         reactor.spawnProcess(protocol, interpreter, command, env=env)
         return deferred
 

=== modified file 'lib/lp/codehosting/puller/tests/__init__.py'
--- lib/lp/codehosting/puller/tests/__init__.py	2012-06-28 09:50:36 +0000
+++ lib/lp/codehosting/puller/tests/__init__.py	2019-09-19 21:35:23 +0000
@@ -10,13 +10,13 @@
 import socket
 from StringIO import StringIO
 
-from bzrlib.tests import TestCaseWithTransport
-from bzrlib.tests.http_server import (
+from breezy.tests import TestCaseWithTransport
+from breezy.tests.http_server import (
     HttpServer,
     TestingHTTPServer,
     TestingThreadingHTTPServer,
     )
-from bzrlib.url_policy_open import AcceptAnythingPolicy
+from breezy.url_policy_open import AcceptAnythingPolicy
 
 from lp.codehosting.puller.worker import (
     BranchMirrorer,

=== modified file 'lib/lp/codehosting/puller/tests/test_acceptance.py'
--- lib/lp/codehosting/puller/tests/test_acceptance.py	2017-12-19 17:22:23 +0000
+++ lib/lp/codehosting/puller/tests/test_acceptance.py	2019-09-19 21:35:23 +0000
@@ -13,15 +13,15 @@
     Popen,
     )
 
-from bzrlib import errors
-from bzrlib.branch import Branch
-from bzrlib.bzrdir import BzrDir
-from bzrlib.upgrade import upgrade
-from bzrlib.urlutils import (
+from breezy import errors
+from breezy.branch import Branch
+from breezy.bzr.bzrdir import BzrDir
+from breezy.upgrade import upgrade
+from breezy.urlutils import (
     join as urljoin,
     local_path_from_url,
     )
-from bzrlib.workingtree import WorkingTree
+from breezy.workingtree import WorkingTree
 from fixtures import TempDir
 import transaction
 from zope.component import getUtility
@@ -284,7 +284,7 @@
         branch_url = urljoin(
             config.launchpad.bzr_imports_root_url, '%08x' % db_branch.id)
         branch = BzrDir.create_branch_convenience(branch_url)
-        tree = branch.bzrdir.open_workingtree()
+        tree = branch.controldir.open_workingtree()
         tree.commit('rev1')
 
         transaction.commit()

=== modified file 'lib/lp/codehosting/puller/tests/test_errors.py'
--- lib/lp/codehosting/puller/tests/test_errors.py	2019-06-08 05:06:08 +0000
+++ lib/lp/codehosting/puller/tests/test_errors.py	2019-09-19 21:35:23 +0000
@@ -11,14 +11,14 @@
 import tempfile
 import urllib2
 
-from bzrlib.errors import (
+from breezy.errors import (
     BzrError,
     NotBranchError,
     ParamikoNotPresent,
     UnknownFormatError,
     UnsupportedFormatError,
     )
-from bzrlib.url_policy_open import (
+from breezy.url_policy_open import (
     BranchLoopError,
     BranchReferenceForbidden,
     )

=== modified file 'lib/lp/codehosting/puller/tests/test_scheduler.py'
--- lib/lp/codehosting/puller/tests/test_scheduler.py	2018-02-14 11:13:47 +0000
+++ lib/lp/codehosting/puller/tests/test_scheduler.py	2019-09-19 21:35:23 +0000
@@ -7,12 +7,10 @@
 import os
 import textwrap
 
-from bzrlib.branch import Branch
-from bzrlib.bzrdir import (
-    BzrDir,
-    format_registry,
-    )
-from bzrlib.urlutils import join as urljoin
+from breezy.branch import Branch
+from breezy.bzr.bzrdir import BzrDir
+from breezy.controldir import format_registry
+from breezy.urlutils import join as urljoin
 from testtools.twistedsupport import (
     assert_fails_with,
     AsynchronousDeferredRunTest,
@@ -545,7 +543,7 @@
 (options, arguments) = parser.parse_args()
 (source_url, destination_url, branch_id, unique_name,
  branch_type_name, default_stacked_on_url) = arguments
-from bzrlib import branch
+from breezy import branch
 branch = branch.Branch.open(destination_url)
 protocol = PullerWorkerProtocol(sys.stdout)
 """
@@ -865,7 +863,7 @@
         # We have to use a custom worker script to lower the time we wait for
         # the lock for (the default is five minutes, too long for a test!)
         lower_timeout_script = """
-        from bzrlib import lockdir
+        from breezy import lockdir
         lockdir._DEFAULT_TIMEOUT_SECONDS = 2.0
         from lp.code.enums import BranchType
         from lp.codehosting.puller.worker import (

=== modified file 'lib/lp/codehosting/puller/tests/test_worker.py'
--- lib/lp/codehosting/puller/tests/test_worker.py	2019-07-09 11:42:39 +0000
+++ lib/lp/codehosting/puller/tests/test_worker.py	2019-09-19 21:35:23 +0000
@@ -8,21 +8,21 @@
 import gc
 from StringIO import StringIO
 
-import bzrlib.branch
-from bzrlib.branch import BranchReferenceFormat
-from bzrlib.bzrdir import BzrDir
-from bzrlib.errors import (
+import breezy.branch
+from breezy.bzr.branch import BranchReferenceFormat
+from breezy.bzr.bzrdir import BzrDir
+from breezy.errors import (
     IncompatibleRepositories,
     NotBranchError,
     NotStacked,
     )
-from bzrlib.revision import NULL_REVISION
-from bzrlib.tests import (
+from breezy.revision import NULL_REVISION
+from breezy.tests import (
     TestCaseInTempDir,
     TestCaseWithTransport,
     )
-from bzrlib.transport import get_transport
-from bzrlib.url_policy_open import (
+from breezy.transport import get_transport
+from breezy.url_policy_open import (
     AcceptAnythingPolicy,
     BadUrl,
     BranchOpener,
@@ -124,7 +124,7 @@
             source_tree.branch.base, self.get_url('dest'))
         source_tree.commit('commit message')
         to_mirror.mirrorWithoutChecks()
-        mirrored_branch = bzrlib.branch.Branch.open(to_mirror.dest)
+        mirrored_branch = breezy.branch.Branch.open(to_mirror.dest)
         self.assertEqual(
             source_tree.last_revision(), mirrored_branch.last_revision())
 
@@ -134,7 +134,7 @@
         to_mirror = self.makePullerWorker(
             source_branch.base, self.get_url('dest'))
         to_mirror.mirrorWithoutChecks()
-        mirrored_branch = bzrlib.branch.Branch.open(to_mirror.dest)
+        mirrored_branch = breezy.branch.Branch.open(to_mirror.dest)
         self.assertEqual(NULL_REVISION, mirrored_branch.last_revision())
 
     def testCanMirrorWhenDestDirExists(self):
@@ -150,9 +150,9 @@
         dest.mkdir('.bzr')
         # 'dest' is not a branch.
         self.assertRaises(
-            NotBranchError, bzrlib.branch.Branch.open, to_mirror.dest)
+            NotBranchError, breezy.branch.Branch.open, to_mirror.dest)
         to_mirror.mirrorWithoutChecks()
-        mirrored_branch = bzrlib.branch.Branch.open(to_mirror.dest)
+        mirrored_branch = breezy.branch.Branch.open(to_mirror.dest)
         self.assertEqual(
             source_tree.last_revision(), mirrored_branch.last_revision())
 
@@ -179,7 +179,7 @@
             source_branch.base, self.get_url('destdir'),
             policy=PrearrangedStackedBranchPolicy(stack_on.base))
         to_mirror.mirrorWithoutChecks()
-        dest = bzrlib.branch.Branch.open(self.get_url('destdir'))
+        dest = breezy.branch.Branch.open(self.get_url('destdir'))
         self.assertFalse(dest._format.supports_stacking())
 
     def test_defaultStackedOnBranchIncompatibleMirrorsOK(self):
@@ -192,7 +192,7 @@
             source_branch.base, self.get_url('destdir'),
             policy=PrearrangedStackedBranchPolicy(stack_on.base))
         to_mirror.mirrorWithoutChecks()
-        dest = bzrlib.branch.Branch.open(self.get_url('destdir'))
+        dest = breezy.branch.Branch.open(self.get_url('destdir'))
         self.assertRaises(NotStacked, dest.get_stacked_on_url)
 
     def testCanMirrorWithIncompatibleRepos(self):
@@ -212,7 +212,7 @@
         # IncompatibleRepositories.
         self.assertRaises(
             IncompatibleRepositories,
-            bzrlib.branch.Branch.open, 'dest/stacked')
+            breezy.branch.Branch.open, 'dest/stacked')
         source_branch = self.make_branch(
             'source-branch', format='2a')
         to_mirror = self.makePullerWorker(
@@ -220,7 +220,7 @@
         # The branch can be mirrored without errors and the destionation
         # location is upgraded to match the source format.
         to_mirror.mirrorWithoutChecks()
-        mirrored_branch = bzrlib.branch.Branch.open(to_mirror.dest)
+        mirrored_branch = breezy.branch.Branch.open(to_mirror.dest)
         self.assertEqual(
             source_branch.repository._format,
             mirrored_branch.repository._format)
@@ -286,7 +286,7 @@
         :return: file url to the created pure branch reference.
         """
         # XXX DavidAllouche 2007-09-12 bug=139109:
-        # We do this manually because the bzrlib API does not support creating
+        # We do this manually because the breezy API does not support creating
         # a branch reference without opening it.
         t = get_transport(self.get_url('.'))
         t.mkdir('reference')
@@ -314,7 +314,7 @@
 
         # Open the branch reference and check that the result is indeed the
         # branch we wanted it to point at.
-        opened_branch = bzrlib.branch.Branch.open(reference_url)
+        opened_branch = breezy.branch.Branch.open(reference_url)
         self.assertEqual(opened_branch.base, target_branch.base)
 
     def testFollowReferenceValue(self):
@@ -496,9 +496,9 @@
     def setUp(self):
         super(TestWorkerProgressReporting, self).setUp()
         BranchOpener.install_hook()
-        self.saved_factory = bzrlib.ui.ui_factory
+        self.saved_factory = breezy.ui.ui_factory
         self.disable_directory_isolation()
-        self.addCleanup(setattr, bzrlib.ui, 'ui_factory', self.saved_factory)
+        self.addCleanup(setattr, breezy.ui, 'ui_factory', self.saved_factory)
 
     def getHttpServerForCwd(self):
         """Get an `HttpServer` instance that serves from '.'."""
@@ -530,7 +530,7 @@
 
         p = self.StubProtocol()
         install_worker_ui_factory(p)
-        b2_http = bzrlib.branch.Branch.open(
+        b2_http = breezy.branch.Branch.open(
             http_server.get_url() + 'some-other-branch')
         b1.pull(b2_http)
         self.assertSubset([WORKER_ACTIVITY_NETWORK], p.calls)

=== modified file 'lib/lp/codehosting/puller/tests/test_worker_formats.py'
--- lib/lp/codehosting/puller/tests/test_worker_formats.py	2019-06-08 05:06:08 +0000
+++ lib/lp/codehosting/puller/tests/test_worker_formats.py	2019-09-19 21:35:23 +0000
@@ -5,19 +5,19 @@
 
 __metaclass__ = type
 
-from bzrlib.branch import Branch
-from bzrlib.bzrdir import BzrDirMetaFormat1
-from bzrlib.plugins.weave_fmt.bzrdir import BzrDirFormat6
-from bzrlib.plugins.weave_fmt.repository import (
+from breezy.branch import Branch
+from breezy.bzr.bzrdir import BzrDirMetaFormat1
+from breezy.bzr.knitpack_repo import RepositoryFormatKnitPack5
+from breezy.bzr.knitrepo import RepositoryFormatKnit1
+from breezy.plugins.weave_fmt.bzrdir import BzrDirFormat6
+from breezy.plugins.weave_fmt.repository import (
     RepositoryFormat6,
     RepositoryFormat7,
     )
-from bzrlib.repofmt.knitpack_repo import RepositoryFormatKnitPack5
-from bzrlib.repofmt.knitrepo import RepositoryFormatKnit1
-from bzrlib.tests.per_repository import TestCaseWithRepository
-from bzrlib.url_policy_open import BranchOpener
+from breezy.tests.per_repository import TestCaseWithRepository
+from breezy.url_policy_open import BranchOpener
 
-import lp.codehosting  # For bzr plugins.
+import lp.codehosting  # For brz plugins.
 from lp.codehosting.puller.tests import PullerWorkerMixin
 from lp.codehosting.tests.helpers import LoomTestMixin
 
@@ -27,7 +27,7 @@
 
     def setUp(self):
         TestCaseWithRepository.setUp(self)
-        # make_bzrdir relies on this being a relative filesystem path.
+        # make_controldir relies on this being a relative filesystem path.
         self._source_branch_path = 'source-branch'
         BranchOpener.install_hook()
         self.worker = self.makePullerWorker(
@@ -39,7 +39,8 @@
         """Make a source branch with the given formats."""
         if branch_format is not None:
             bzrdir_format.set_branch_format(branch_format)
-        bd = self.make_bzrdir(self._source_branch_path, format=bzrdir_format)
+        bd = self.make_controldir(
+            self._source_branch_path, format=bzrdir_format)
         repository_format.initialize(bd)
         branch = bd.create_branch()
         tree = branch.create_checkout('source-checkout')
@@ -58,8 +59,8 @@
             source_branch.repository._format.get_format_description(),
             dest_branch.repository._format.get_format_description())
         self.assertEqual(
-            source_branch.bzrdir._format.get_format_description(),
-            dest_branch.bzrdir._format.get_format_description())
+            source_branch.controldir._format.get_format_description(),
+            dest_branch.controldir._format.get_format_description())
 
     def _testMirrorWithFormats(self, repository_format, bzrdir_format):
         """Make a branch with certain formats, mirror it and check the mirror.
@@ -85,9 +86,8 @@
         self.assertMirrored(branch, mirrored_branch)
 
     # XXX: JonathanLange 2008-06-25: These next three tests should be
-    # implemented against all supported repository formats using bzrlib's test
-    # adaptation APIs. Unfortunately, this API changes between 1.5 and 1.6, so
-    # it'd be a bit silly to do the work now.
+    # implemented against all supported repository formats using breezy's test
+    # adaptation APIs.
     def testMirrorKnitAsKnit(self):
         # Create a source branch in knit format, and check that the mirror is
         # in knit format.

=== modified file 'lib/lp/codehosting/puller/worker.py'
--- lib/lp/codehosting/puller/worker.py	2019-07-25 15:00:18 +0000
+++ lib/lp/codehosting/puller/worker.py	2019-09-19 21:35:23 +0000
@@ -12,22 +12,25 @@
 # line below this comment.
 import lp.codehosting
 
-from bzrlib import (
+from breezy import (
     errors,
     urlutils,
     )
-from bzrlib.branch import Branch
-from bzrlib.plugins.loom.branch import LoomSupport
-from bzrlib.plugins.weave_fmt.branch import BzrBranchFormat4
-from bzrlib.plugins.weave_fmt.repository import (
+from breezy.branch import (
+    Branch,
+    UnstackableBranchFormat,
+    )
+from breezy.plugins.loom.branch import LoomSupport
+from breezy.plugins.weave_fmt.branch import BzrBranchFormat4
+from breezy.plugins.weave_fmt.repository import (
     RepositoryFormat4,
     RepositoryFormat5,
     RepositoryFormat6,
     )
-from bzrlib.transport import get_transport
-import bzrlib.ui
-from bzrlib.ui import SilentUIFactory
-from bzrlib.url_policy_open import (
+from breezy.transport import get_transport
+import breezy.ui
+from breezy.ui import SilentUIFactory
+from breezy.url_policy_open import (
     BadUrl,
     BranchLoopError,
     BranchOpener,
@@ -158,7 +161,7 @@
             revision_id = None
         else:
             revision_id = 'null:'
-        source_branch.bzrdir.clone_on_transport(
+        source_branch.controldir.clone_on_transport(
             dest_transport, revision_id=revision_id)
         return Branch.open(destination_url)
 
@@ -251,7 +254,7 @@
         try:
             dest_branch.set_stacked_on_url(stacked_on_url)
         except (errors.UnstackableRepositoryFormat,
-                errors.UnstackableBranchFormat,
+                UnstackableBranchFormat,
                 errors.IncompatibleRepositories):
             stacked_on_url = None
         if stacked_on_url is None:
@@ -448,7 +451,7 @@
             # XXX: Aaron Bentley 2008-06-13
             # Bazaar does not provide a public API for learning about
             # format markers.  Fix this in Bazaar, then here.
-            control_string = dest_branch.bzrdir._format.get_format_string()
+            control_string = dest_branch.controldir._format.get_format_string()
             if dest_branch._format.__class__ is BzrBranchFormat4:
                 branch_string = BranchFormat.BZR_BRANCH_4.title
             else:
@@ -488,8 +491,10 @@
     def confirm_action(self, prompt, confirmation_id, args):
         """If we're asked to break a lock like a stale lock of ours, say yes.
         """
-        assert confirmation_id == 'bzrlib.lockdir.break', \
-            "Didn't expect confirmation id %r" % (confirmation_id,)
+        if confirmation_id not in (
+                'bzrlib.lockdir.break', 'breezy.lockdir.break'):
+            raise AssertionError(
+                "Didn't expect confirmation id %r" % (confirmation_id,))
         branch_id = self.puller_worker_protocol.branch_id
         prompt = prompt % args
         if get_lock_id_for_branch_id(branch_id) in prompt:
@@ -518,7 +523,7 @@
     2) Break locks if and only if they appear to be stale locks
        created by another puller worker process.
     """
-    bzrlib.ui.ui_factory = PullerWorkerUIFactory(puller_worker_protocol)
+    breezy.ui.ui_factory = PullerWorkerUIFactory(puller_worker_protocol)
 
 
 class MirroredBranchPolicy(BranchMirrorerPolicy):
@@ -600,7 +605,7 @@
         Because we control the process that creates import branches, a
         vfs-level copy is safe and more efficient than a bzr fetch.
         """
-        source_transport = source_branch.bzrdir.root_transport
+        source_transport = source_branch.controldir.root_transport
         dest_transport = get_transport(destination_url)
         while True:
             # We loop until the remote file list before and after the copy is

=== modified file 'lib/lp/codehosting/rewrite.py'
--- lib/lp/codehosting/rewrite.py	2012-07-03 17:52:05 +0000
+++ lib/lp/codehosting/rewrite.py	2019-09-19 21:35:23 +0000
@@ -6,7 +6,7 @@
 
 import time
 
-from bzrlib import urlutils
+from breezy import urlutils
 from zope.component import getUtility
 from zope.security.interfaces import Unauthorized
 

=== modified file 'lib/lp/codehosting/scanner/buglinks.py'
--- lib/lp/codehosting/scanner/buglinks.py	2012-02-09 16:13:00 +0000
+++ lib/lp/codehosting/scanner/buglinks.py	2019-09-19 21:35:23 +0000
@@ -10,7 +10,7 @@
 
 import urlparse
 
-from bzrlib.errors import InvalidBugStatus
+from breezy.bugtracker import InvalidBugStatus
 from zope.component import getUtility
 
 from lp.app.errors import NotFoundError

=== modified file 'lib/lp/codehosting/scanner/bzrsync.py'
--- lib/lp/codehosting/scanner/bzrsync.py	2018-04-17 09:41:46 +0000
+++ lib/lp/codehosting/scanner/bzrsync.py	2019-09-19 21:35:23 +0000
@@ -16,8 +16,8 @@
 
 import logging
 
-from bzrlib.graph import DictParentsProvider
-from bzrlib.revision import NULL_REVISION
+from breezy.graph import DictParentsProvider
+from breezy.revision import NULL_REVISION
 import pytz
 import six
 from storm.locals import Store
@@ -91,7 +91,7 @@
         self.logger.info("    from %s", bzr_branch.base)
         # Get the history and ancestry from the branch first, to fail early
         # if something is wrong with the branch.
-        self.logger.info("Retrieving history from bzrlib.")
+        self.logger.info("Retrieving history from breezy.")
         bzr_history = branch_revision_history(bzr_branch)
         # The BranchRevision, Revision and RevisionParent tables are only
         # written to by the branch-scanner, so they are not subject to
@@ -197,7 +197,7 @@
 
     def planDatabaseChanges(self, bzr_branch, bzr_history, db_ancestry,
                             db_history):
-        """Plan database changes to synchronize with bzrlib data.
+        """Plan database changes to synchronize with breezy data.
 
         Use the data retrieved by `retrieveDatabaseAncestry` and
         `retrieveBranchDetails` to plan the changes to apply to the database.
@@ -240,7 +240,7 @@
     def getBazaarRevisions(self, bzr_branch, revisions):
         """Like ``get_revisions(revisions)`` but filter out ghosts first.
 
-        :param revisions: the set of Bazaar revision IDs to return bzrlib
+        :param revisions: the set of Breezy revision IDs to return breezy
             Revision objects for.
         """
         revisions = bzr_branch.repository.get_parent_map(revisions)
@@ -249,9 +249,9 @@
     def syncRevisions(self, bzr_branch, bzr_revisions, revids_to_insert):
         """Import the supplied revisions.
 
-        :param bzr_branch: The Bazaar branch that's being scanned.
+        :param bzr_branch: The Breezy branch that's being scanned.
         :param bzr_revisions: the revisions to import
-        :type bzr_revision: bzrlib.revision.Revision
+        :type bzr_revision: breezy.revision.Revision
         :param revids_to_insert: a dict of revision ids to integer
             revno. Non-mainline revisions will be mapped to None.
         """

=== modified file 'lib/lp/codehosting/scanner/mergedetection.py'
--- lib/lp/codehosting/scanner/mergedetection.py	2018-10-21 17:32:46 +0000
+++ lib/lp/codehosting/scanner/mergedetection.py	2019-09-19 21:35:23 +0000
@@ -9,7 +9,7 @@
     'auto_merge_proposals',
     ]
 
-from bzrlib.revision import NULL_REVISION
+from breezy.revision import NULL_REVISION
 from zope.component import getUtility
 
 from lp.code.adapters.branch import BranchMergeProposalNoPreviewDiffDelta

=== modified file 'lib/lp/codehosting/scanner/tests/test_buglinks.py'
--- lib/lp/codehosting/scanner/tests/test_buglinks.py	2019-05-22 14:57:45 +0000
+++ lib/lp/codehosting/scanner/tests/test_buglinks.py	2019-09-19 21:35:23 +0000
@@ -1,11 +1,11 @@
 # Copyright 2009 Canonical Ltd.  This software is licensed under the
 # GNU Affero General Public License version 3 (see the file LICENSE).
 
-"""Tests for creating BugBranch items based on Bazaar revisions."""
+"""Tests for creating BugBranch items based on Breezy revisions."""
 
 __metaclass__ = type
 
-from bzrlib.revision import Revision
+from breezy.revision import Revision
 from zope.component import getUtility
 from zope.event import notify
 
@@ -192,7 +192,7 @@
         author = self.factory.getUniqueString()
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             self.bzr_tree.commit(
                 u'common parent', committer=author, rev_id='r1',
                 allow_pointless=True)
@@ -253,7 +253,7 @@
         switch_dbuser("branchscanner")
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             revision_id = tree.commit('fix revision',
                 revprops={
                     'bugs': 'https://launchpad.net/bugs/%d fixed' % bug.id})

=== modified file 'lib/lp/codehosting/scanner/tests/test_bzrsync.py'
--- lib/lp/codehosting/scanner/tests/test_bzrsync.py	2019-07-09 12:32:22 +0000
+++ lib/lp/codehosting/scanner/tests/test_bzrsync.py	2019-09-19 21:35:23 +0000
@@ -8,13 +8,13 @@
 import random
 import time
 
-from bzrlib.revision import (
+from breezy.revision import (
     NULL_REVISION,
     Revision as BzrRevision,
     )
-from bzrlib.tests import TestCaseWithTransport
-from bzrlib.uncommit import uncommit
-from bzrlib.url_policy_open import BranchOpener
+from breezy.tests import TestCaseWithTransport
+from breezy.uncommit import uncommit
+from breezy.url_policy_open import BranchOpener
 from fixtures import (
     FakeLogger,
     TempDir,
@@ -191,7 +191,7 @@
             self.bzr_tree.add_pending_merge(*extra_parents)
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             return self.bzr_tree.commit(
                 message, committer=committer, rev_id=rev_id,
                 timestamp=timestamp, timezone=timezone, allow_pointless=True,
@@ -240,7 +240,7 @@
                 db_branch=db_branch)
             # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
             # required to generate the revision-id.
-            with override_environ(BZR_EMAIL='[e-mail]'):
+            with override_environ(BRZ_EMAIL='[e-mail]'):
                 trunk_tree.commit(u'base revision', rev_id=base_rev_id)
 
                 # Branch from the base revision.
@@ -572,7 +572,8 @@
         # deletion anyway.
         rev1_id = self.bzr_tree.commit(
             'initial commit', committer='[e-mail]')
-        merge_tree = self.bzr_tree.bzrdir.sprout('merge').open_workingtree()
+        merge_tree = self.bzr_tree.controldir.sprout(
+            'merge').open_workingtree()
         merge_id = merge_tree.commit(
             'mergeable commit', committer='[e-mail]')
         self.bzr_tree.merge_from_branch(merge_tree.branch)

=== modified file 'lib/lp/codehosting/scanner/tests/test_email.py'
--- lib/lp/codehosting/scanner/tests/test_email.py	2018-01-02 10:54:31 +0000
+++ lib/lp/codehosting/scanner/tests/test_email.py	2019-09-19 21:35:23 +0000
@@ -8,7 +8,7 @@
 import email
 import os
 
-from bzrlib.uncommit import uncommit
+from breezy.uncommit import uncommit
 from zope.component import getUtility
 from zope.event import notify
 

=== modified file 'lib/lp/codehosting/scanner/tests/test_mergedetection.py'
--- lib/lp/codehosting/scanner/tests/test_mergedetection.py	2018-04-10 21:41:45 +0000
+++ lib/lp/codehosting/scanner/tests/test_mergedetection.py	2019-09-19 21:35:23 +0000
@@ -7,7 +7,7 @@
 
 import logging
 
-from bzrlib.revision import NULL_REVISION
+from breezy.revision import NULL_REVISION
 from lazr.lifecycle.event import ObjectModifiedEvent
 import transaction
 from zope.component import getUtility
@@ -143,7 +143,7 @@
 
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             branch_tree.commit(u'another revision', rev_id='another-rev')
         current_proposal_status = proposal.queue_status
         self.assertNotEqual(
@@ -164,7 +164,7 @@
 
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             branch_tree.commit(u'another revision', rev_id='another-rev')
         current_proposal_status = proposal.queue_status
         self.assertNotEqual(

=== modified file 'lib/lp/codehosting/scripts/tests/test_upgrade_all_branches.py'
--- lib/lp/codehosting/scripts/tests/test_upgrade_all_branches.py	2012-03-26 22:45:24 +0000
+++ lib/lp/codehosting/scripts/tests/test_upgrade_all_branches.py	2019-09-19 21:35:23 +0000
@@ -8,7 +8,7 @@
 import os
 from os.path import dirname
 
-from bzrlib.repofmt.groupcompress_repo import RepositoryFormat2a
+from breezy.bzr.groupcompress_repo import RepositoryFormat2a
 from fixtures import TempDir
 import transaction
 

=== modified file 'lib/lp/codehosting/sftp.py'
--- lib/lp/codehosting/sftp.py	2015-10-19 10:56:16 +0000
+++ lib/lp/codehosting/sftp.py	2019-09-19 21:35:23 +0000
@@ -24,12 +24,12 @@
 import os
 import stat
 
-from bzrlib import (
+from breezy import (
     errors as bzr_errors,
     osutils,
     urlutils,
     )
-from bzrlib.transport.local import LocalTransport
+from breezy.transport.local import LocalTransport
 from lazr.sshserver.sftp import FileIsADirectory
 from twisted.conch.interfaces import (
     ISFTPFile,
@@ -160,7 +160,7 @@
     def _truncateFile(self):
         """Truncate this file."""
         self._written = True
-        return self.transport.put_bytes(self._escaped_path, '')
+        return self.transport.put_bytes(self._escaped_path, b'')
 
     @with_sftp_error
     def writeChunk(self, offset, data):
@@ -198,7 +198,7 @@
 
             Doing things this way around, by trying to read all the data
             requested and then handling the short read error, might be a bit
-            inefficient, but the bzrlib sftp transport doesn't read past the
+            inefficient, but the breezy sftp transport doesn't read past the
             end of files, so we don't need to worry too much about performance
             here.
             """

=== modified file 'lib/lp/codehosting/sshserver/session.py'
--- lib/lp/codehosting/sshserver/session.py	2016-12-22 16:32:38 +0000
+++ lib/lp/codehosting/sshserver/session.py	2019-09-19 21:35:23 +0000
@@ -26,7 +26,7 @@
 from zope.event import notify
 from zope.interface import implementer
 
-from lp.codehosting import get_bzr_path
+from lp.codehosting import get_brz_path
 from lp.services.config import config
 
 
@@ -141,16 +141,17 @@
 
         :return: The pid, communication directory, and request socket.
         """
-        assert executable == 'bzr', executable  # Maybe .endswith()
-        assert args[0] == 'bzr', args[0]
+        assert executable == 'brz', executable  # Maybe .endswith()
+        assert args[0] == 'brz', args[0]
         message = ['fork-env %s\n' % (' '.join(args[1:]),)]
         for key, value in environment.iteritems():
-            # XXX: Currently we only pass BZR_EMAIL, should we be passing
+            # XXX: Currently we only pass BRZ_EMAIL, should we be passing
             #      everything else? Note that many won't be handled properly,
             #      since the process is already running.
-            if key != 'BZR_EMAIL':
-                continue
-            message.append('%s: %s\n' % (key, value))
+            if key in ('BZR_EMAIL', 'BRZ_EMAIL'):
+                # Map both of these to BRZ_EMAIL, since we run brz on the
+                # server.
+                message.append('BRZ_EMAIL: %s\n' % (value,))
         message.append('end\n')
         message = ''.join(message)
         response, sock = self._sendMessageToService(message)
@@ -418,7 +419,7 @@
     def _simplifyEnvironment(self, env):
         """Pull out the bits of the environment we want to pass along."""
         env = {}
-        for env_var in ['BZR_EMAIL']:
+        for env_var in ['BRZ_EMAIL']:
             if env_var in self.environment:
                 env[env_var] = self.environment[env_var]
         return env
@@ -426,15 +427,15 @@
     def getCommandToFork(self, executable, arguments, env):
         assert executable.endswith('/bin/py')
         assert arguments[0] == executable
-        assert arguments[1].endswith('/bzr')
-        executable = 'bzr'
+        assert arguments[1].endswith('/brz')
+        executable = 'brz'
         arguments = arguments[1:]
-        arguments[0] = 'bzr'
+        arguments[0] = 'brz'
         env = self._simplifyEnvironment(env)
         return executable, arguments, env
 
     def _spawn(self, protocol, executable, arguments, env):
-        # When spawning, adapt the idea of "bin/py .../bzr" to just using "bzr"
+        # When spawning, adapt the idea of "bin/py .../brz" to just using "brz"
         # and the executable
         executable, arguments, env = self.getCommandToFork(executable,
                                                            arguments, env)
@@ -449,16 +450,18 @@
     :return: Command template
     :raise ForbiddenCommand: Raised when command isn't allowed
     """
-    python_command = "%(root)s/bin/py %(bzr)s" % {
+    python_command = "%(root)s/bin/py %(brz)s" % {
             'root': config.root,
-            'bzr': get_bzr_path(),
+            'brz': get_brz_path(),
             }
     args = " lp-serve --inet %(user_id)s"
     command_template = python_command + args
 
-    if command == 'bzr serve --inet --directory=/ --allow-writes':
+    if command in (
+            'bzr serve --inet --directory=/ --allow-writes',
+            'brz serve --inet --directory=/ --allow-writes'):
         return command_template
-    # At the moment, only bzr branch serving is allowed.
+    # At the moment, only bzr/brz branch serving is allowed.
     raise ForbiddenCommand("Not allowed to execute %r." % (command,))
 
 
@@ -469,7 +472,7 @@
 
     # Extract the hostname from the supermirror root config.
     hostname = urlparse.urlparse(config.codehosting.supermirror_root)[1]
-    environment['BZR_EMAIL'] = '%s@%s' % (avatar.username, hostname)
+    environment['BRZ_EMAIL'] = '%s@%s' % (avatar.username, hostname)
     # TODO: Use a FeatureFlag to enable this in a more fine-grained approach.
     #       If the forking daemon has been spawned, then we can use it if the
     #       feature is set to true for the given user, etc.

=== modified file 'lib/lp/codehosting/sshserver/tests/test_session.py'
--- lib/lp/codehosting/sshserver/tests/test_session.py	2019-05-22 14:57:45 +0000
+++ lib/lp/codehosting/sshserver/tests/test_session.py	2019-09-19 21:35:23 +0000
@@ -13,8 +13,8 @@
 from twisted.internet.protocol import ProcessProtocol
 
 from lp.codehosting import (
-    get_bzr_path,
-    get_BZR_PLUGIN_PATH_for_subprocess,
+    get_brz_path,
+    get_BRZ_PLUGIN_PATH_for_subprocess,
     )
 from lp.codehosting.sshserver.daemon import CodehostingAvatar
 from lp.codehosting.sshserver.session import (
@@ -382,18 +382,18 @@
             "ISession(avatar) doesn't adapt to ExecOnlySession. "
             "Got %r instead." % (session,))
         self.assertEqual(
-            get_BZR_PLUGIN_PATH_for_subprocess(),
-            session.environment['BZR_PLUGIN_PATH'])
+            get_BRZ_PLUGIN_PATH_for_subprocess(),
+            session.environment['BRZ_PLUGIN_PATH'])
         self.assertEqual(
             '[e-mail]' % self.avatar.username,
-            session.environment['BZR_EMAIL'])
+            session.environment['BRZ_EMAIL'])
 
         executable, arguments = session.getCommandToRun(
             'bzr serve --inet --directory=/ --allow-writes')
         interpreter = '%s/bin/py' % config.root
         self.assertEqual(interpreter, executable)
         self.assertEqual(
-            [interpreter, get_bzr_path(), 'lp-serve',
+            [interpreter, get_brz_path(), 'lp-serve',
              '--inet', str(self.avatar.user_id)],
             list(arguments))
         self.assertRaises(
@@ -422,9 +422,9 @@
             'bzr serve --inet --directory=/ --allow-writes')
         executable, arguments, env = session.getCommandToFork(
             executable, arguments, session.environment)
-        self.assertEqual('bzr', executable)
+        self.assertEqual('brz', executable)
         self.assertEqual(
-             ['bzr', 'lp-serve',
+             ['brz', 'lp-serve',
               '--inet', str(self.avatar.user_id)],
              list(arguments))
 
@@ -436,7 +436,14 @@
 
     def test_bzr(self):
         self.assertEqual(
-            config.root + '/bin/py ' + get_bzr_path() +
+            config.root + '/bin/py ' + get_brz_path() +
             ' lp-serve --inet %(user_id)s',
             lookup_command_template(
                 'bzr serve --inet --directory=/ --allow-writes'))
+
+    def test_brz(self):
+        self.assertEqual(
+            config.root + '/bin/py ' + get_brz_path() +
+            ' lp-serve --inet %(user_id)s',
+            lookup_command_template(
+                'brz serve --inet --directory=/ --allow-writes'))

=== modified file 'lib/lp/codehosting/tests/helpers.py'
--- lib/lp/codehosting/tests/helpers.py	2017-12-19 17:22:44 +0000
+++ lib/lp/codehosting/tests/helpers.py	2019-09-19 21:35:23 +0000
@@ -15,10 +15,9 @@
 
 import os
 
-from bzrlib.bzrdir import BzrDir
-from bzrlib.errors import FileExists
-from bzrlib.plugins.loom import branch as loom_branch
-from bzrlib.tests import (
+from breezy.errors import FileExists
+from breezy.plugins.loom import branch as loom_branch
+from breezy.tests import (
     TestNotApplicable,
     TestSkipped,
     )
@@ -60,7 +59,7 @@
             loom_branch.loomify(tree.branch)
         finally:
             tree.unlock()
-        loom_tree = tree.bzrdir.open_workingtree()
+        loom_tree = tree.controldir.open_workingtree()
         loom_tree.lock_write()
         loom_tree.branch.new_thread('bottom-thread')
         loom_tree.commit('this is a commit', rev_id='commit-1')
@@ -78,7 +77,7 @@
             loom_branch.loomify(tree.branch)
         finally:
             tree.unlock()
-        loom_tree = tree.bzrdir.open_workingtree()
+        loom_tree = tree.controldir.open_workingtree()
         loom_tree.lock_write()
         loom_tree.branch.new_thread('bottom-thread')
         loom_tree.commit('this is a commit', rev_id='commit-1')
@@ -100,6 +99,9 @@
 
 def create_branch_with_one_revision(branch_dir, format=None):
     """Create a dummy Bazaar branch at the given directory."""
+    # XXX cjwatson 2019-06-13: This still uses bzrlib until such time as the
+    # code import workers are ported to Breezy.
+    from bzrlib.bzrdir import BzrDir
     if not os.path.exists(branch_dir):
         os.makedirs(branch_dir)
     try:
@@ -124,7 +126,7 @@
 
 
 class TestResultWrapper:
-    """A wrapper for `TestResult` that knows about bzrlib's `TestSkipped`."""
+    """A wrapper for `TestResult` that knows about breezy's `TestSkipped`."""
 
     def __init__(self, result):
         self.result = result

=== modified file 'lib/lp/codehosting/tests/servers.py'
--- lib/lp/codehosting/tests/servers.py	2019-05-22 14:57:45 +0000
+++ lib/lp/codehosting/tests/servers.py	2019-09-19 21:35:23 +0000
@@ -15,7 +15,7 @@
 import shutil
 import tempfile
 
-from bzrlib.transport import (
+from breezy.transport import (
     get_transport,
     Server,
     )

=== modified file 'lib/lp/codehosting/tests/test_acceptance.py'
--- lib/lp/codehosting/tests/test_acceptance.py	2017-12-21 17:25:35 +0000
+++ lib/lp/codehosting/tests/test_acceptance.py	2019-09-19 21:35:23 +0000
@@ -14,11 +14,11 @@
 import urllib2
 import xmlrpclib
 
-import bzrlib.branch
-from bzrlib.tests import TestCaseWithTransport
-from bzrlib.tests.per_repository import all_repository_format_scenarios
-from bzrlib.urlutils import local_path_from_url
-from bzrlib.workingtree import WorkingTree
+import breezy.branch
+from breezy.tests import TestCaseWithTransport
+from breezy.tests.per_repository import all_repository_format_scenarios
+from breezy.urlutils import local_path_from_url
+from breezy.workingtree import WorkingTree
 from testscenarios import (
     load_tests_apply_scenarios,
     WithScenarios,
@@ -37,8 +37,8 @@
     get_non_existant_source_package_branch_unique_name,
     )
 from lp.codehosting import (
-    get_bzr_path,
-    get_BZR_PLUGIN_PATH_for_subprocess,
+    get_brz_path,
+    get_BRZ_PLUGIN_PATH_for_subprocess,
     )
 from lp.codehosting.bzrutils import DenyingServer
 from lp.codehosting.tests.helpers import LoomTestMixin
@@ -64,10 +64,10 @@
         self.socket_path = None
 
     def setUp(self):
-        bzr_path = get_bzr_path()
-        BZR_PLUGIN_PATH = get_BZR_PLUGIN_PATH_for_subprocess()
+        brz_path = get_brz_path()
+        BRZ_PLUGIN_PATH = get_BRZ_PLUGIN_PATH_for_subprocess()
         env = os.environ.copy()
-        env['BZR_PLUGIN_PATH'] = BZR_PLUGIN_PATH
+        env['BRZ_PLUGIN_PATH'] = BRZ_PLUGIN_PATH
         # TODO: We probably want to use a random disk path for
         #       forking_daemon_socket, but we need to update config so that
         #       the CodeHosting service can find it.
@@ -77,7 +77,7 @@
         #       settings, we have to somehow pass it a new config-on-disk to
         #       use.
         self.socket_path = config.codehosting.forking_daemon_socket
-        command = [sys.executable, bzr_path, 'launchpad-forking-service',
+        command = [sys.executable, brz_path, 'launchpad-forking-service',
                    '--path', self.socket_path, '-Derror']
         process = subprocess.Popen(
             command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
@@ -110,12 +110,12 @@
             print process.stderr.read()
             print "-" * 70
             raise RuntimeError(
-                'Bzr server did not start correctly.  See stdout and stderr '
-                'reported above. Command was "%s".  PYTHONPATH was "%s".  '
-                'BZR_PLUGIN_PATH was "%s".' %
+                'Breezy server did not start correctly.  See stdout and '
+                'stderr reported above. Command was "%s".  PYTHONPATH was '
+                '"%s".  BRZ_PLUGIN_PATH was "%s".' %
                 (' '.join(command),
                  env.get('PYTHONPATH'),
-                 env.get('BZR_PLUGIN_PATH')))
+                 env.get('BRZ_PLUGIN_PATH')))
 
     def tearDown(self):
         # SIGTERM is the graceful exit request, potentially we could wait a
@@ -234,8 +234,8 @@
         """
         return self.run_bzr_subprocess(
             args, env_changes={
-                'BZR_SSH': 'paramiko',
-                'BZR_PLUGIN_PATH': get_BZR_PLUGIN_PATH_for_subprocess()
+                'BRZ_SSH': 'paramiko',
+                'BRZ_PLUGIN_PATH': get_BRZ_PLUGIN_PATH_for_subprocess()
             },
             allow_plugins=True, retcode=retcode)
 
@@ -244,7 +244,7 @@
         """
         output, error = self._run_bzr(args, retcode=3)
         for line in error.splitlines():
-            if line.startswith("bzr: ERROR"):
+            if line.startswith("brz: ERROR"):
                 return line
         raise AssertionError(
             "Didn't find error line in output:\n\n%s\n" % error)
@@ -253,12 +253,12 @@
         """Branch from the given URL to a local directory."""
         self._run_bzr(['branch', remote_url, local_directory])
 
-    def get_bzr_path(self):
-        """See `bzrlib.tests.TestCase.get_bzr_path`.
+    def get_brz_path(self):
+        """See `breezy.tests.TestCase.get_brz_path`.
 
-        We override this to return the 'bzr' executable from sourcecode.
+        We override this to return our own 'brz' executable.
         """
-        return get_bzr_path()
+        return get_brz_path()
 
     def push(self, local_directory, remote_url, extra_args=None):
         """Push the local branch to the given URL."""
@@ -271,19 +271,19 @@
         """Check that we cannot push from 'local_directory' to 'remote_url'.
 
         In addition, if a list of messages is supplied as the error_messages
-        argument, check that the bzr client printed one of these messages
-        which shouldn't include the 'bzr: ERROR:' part of the message.
+        argument, check that the brz client printed one of these messages
+        which shouldn't include the 'brz: ERROR:' part of the message.
 
         :return: The last line of the stderr from the subprocess, which will
-            be the 'bzr: ERROR: <repr of Exception>' line.
+            be the 'brz: ERROR: <repr of Exception>' line.
         """
         error_line = self._run_bzr_error(
             ['push', '-d', local_directory, remote_url])
-        # This will be the will be the 'bzr: ERROR: <repr of Exception>' line.
+        # This will be the 'brz: ERROR: <repr of Exception>' line.
         if not error_messages:
             return error_line
         for msg in error_messages:
-            if error_line.startswith('bzr: ERROR: ' + msg):
+            if error_line.startswith('brz: ERROR: ' + msg):
                 return error_line
         self.fail(
             "Error message %r didn't match any of those supplied."
@@ -340,11 +340,11 @@
     """Smoke test for repository support."""
 
     excluded_scenarios = [
-        # RepositoryFormat4 is not initializable (bzrlib raises TestSkipped
+        # RepositoryFormat4 is not initializable (breezy raises TestSkipped
         # when you try).
         'RepositoryFormat4',
         # Fetching weave formats from the smart server is known to be broken.
-        # See bug 173807 and bzrlib.tests.test_repository.
+        # See bug 173807 and breezy.tests.test_repository.
         'RepositoryFormat5',
         'RepositoryFormat6',
         'RepositoryFormat7',
@@ -364,14 +364,14 @@
         self.second_tree = 'second'
 
     def make_branch_specifying_repo_format(self, relpath, repo_format):
-        bd = self.make_bzrdir(relpath, format=self.bzrdir_format)
+        bd = self.make_controldir(relpath, format=self.bzrdir_format)
         repo_format.initialize(bd)
         return bd.create_branch()
 
     def make_branch_and_tree(self, relpath):
         b = self.make_branch_specifying_repo_format(
             relpath, self.repository_format)
-        return b.bzrdir.create_workingtree()
+        return b.controldir.create_workingtree()
 
     def test_smoke(self):
         # Make a new branch
@@ -411,7 +411,7 @@
         error_line = self._run_bzr_error(
             ['cat-revision', '-r', 'branch:' + url])
         self.assertTrue(
-            error_line.startswith('bzr: ERROR: Not a branch:'),
+            error_line.startswith('brz: ERROR: Not a branch:'),
             'Expected "Not a branch", found %r' % error_line)
 
     def makeDatabaseBranch(self, owner_name, product_name, branch_name,
@@ -693,7 +693,7 @@
         # We can get information from a read-only branch.
         ro_branch_url = self.createBazaarBranch(
             'mark', '+junk', 'ro-branch')
-        revision = bzrlib.branch.Branch.open(ro_branch_url).last_revision()
+        revision = breezy.branch.Branch.open(ro_branch_url).last_revision()
         remote_revision = self.getLastRevision(
             self.getTransportURL('~mark/+junk/ro-branch'))
         self.assertEqual(revision, remote_revision)
@@ -715,7 +715,7 @@
         # Added to catch bug 126245.
         ro_branch_url = self.makeMirroredBranch(
             'testuser', 'firefox', 'mirror')
-        revision = bzrlib.branch.Branch.open(ro_branch_url).last_revision()
+        revision = breezy.branch.Branch.open(ro_branch_url).last_revision()
         remote_revision = self.getLastRevision(
             self.getTransportURL('~testuser/firefox/mirror'))
         self.assertEqual(revision, remote_revision)
@@ -724,7 +724,7 @@
         # Users should be able to read mirrored branches even if they don't
         # own those branches.
         ro_branch_url = self.makeMirroredBranch('mark', 'firefox', 'mirror')
-        revision = bzrlib.branch.Branch.open(ro_branch_url).last_revision()
+        revision = breezy.branch.Branch.open(ro_branch_url).last_revision()
         remote_revision = self.getLastRevision(
             self.getTransportURL('~mark/firefox/mirror'))
         self.assertEqual(revision, remote_revision)

=== renamed file 'lib/lp/codehosting/tests/test_bzrlib.py' => 'lib/lp/codehosting/tests/test_breezy.py'
--- lib/lp/codehosting/tests/test_bzrlib.py	2014-01-30 15:04:06 +0000
+++ lib/lp/codehosting/tests/test_breezy.py	2019-09-19 21:35:23 +0000
@@ -1,17 +1,17 @@
 # Copyright 2009 Canonical Ltd.  This software is licensed under the
 # GNU Affero General Public License version 3 (see the file LICENSE).
 
-"""Launchpad specific tests of bzrlib behaviour."""
+"""Launchpad-specific tests of Breezy behaviour."""
 
 __metaclass__ = type
 
 from lp.testing import TestCase
 
 
-class TestBzrlib(TestCase):
+class TestBreezy(TestCase):
     def test_has_cextensions(self):
-        """Ensure Bazaar C extensions are being used."""
+        """Ensure Breezy C extensions are being used."""
         try:
-            import bzrlib._dirstate_helpers_pyx
+            import breezy.bzr._dirstate_helpers_pyx
         except ImportError:
-            self.fail("Bzr not built with C extensions.")
+            self.fail("Breezy not built with C extensions.")

=== modified file 'lib/lp/codehosting/tests/test_bzrutils.py'
--- lib/lp/codehosting/tests/test_bzrutils.py	2018-01-02 10:54:31 +0000
+++ lib/lp/codehosting/tests/test_bzrutils.py	2019-09-19 21:35:23 +0000
@@ -8,20 +8,23 @@
 import gc
 import sys
 
-from bzrlib import (
+from breezy import (
     errors,
     trace,
     )
-from bzrlib.branch import Branch
-from bzrlib.bzrdir import format_registry
-from bzrlib.errors import AppendRevisionsOnlyViolation
-from bzrlib.remote import RemoteBranch
-from bzrlib.tests import (
+from breezy.branch import (
+    Branch,
+    UnstackableBranchFormat,
+    )
+from breezy.bzr.remote import RemoteBranch
+from breezy.controldir import format_registry
+from breezy.errors import AppendRevisionsOnlyViolation
+from breezy.tests import (
     test_server,
     TestCaseWithTransport,
     TestNotApplicable,
     )
-from bzrlib.tests.per_branch import (
+from breezy.tests.per_branch import (
     branch_scenarios,
     TestCaseWithControlDir,
     )
@@ -80,14 +83,14 @@
         stacked_branch = self.make_branch('stacked')
         try:
             stacked_branch.set_stacked_on_url('../stacked-on')
-        except errors.UnstackableBranchFormat:
+        except UnstackableBranchFormat:
             raise TestNotApplicable('This format does not support stacking.')
         # Deleting the stacked-on branch ensures that Bazaar will raise an
         # error if it tries to open the stacked-on branch.
         self.get_transport('.').delete_tree('stacked-on')
         self.assertEqual(
             '../stacked-on',
-            get_branch_stacked_on_url(stacked_branch.bzrdir))
+            get_branch_stacked_on_url(stacked_branch.controldir))
 
     def testGetBranchStackedOnUrlUnstackable(self):
         # get_branch_stacked_on_url raises UnstackableBranchFormat if it's
@@ -97,11 +100,11 @@
             branch.get_stacked_on_url()
         except errors.NotStacked:
             raise TestNotApplicable('This format supports stacked branches.')
-        except errors.UnstackableBranchFormat:
+        except UnstackableBranchFormat:
             pass
         self.assertRaises(
-            errors.UnstackableBranchFormat,
-            get_branch_stacked_on_url, branch.bzrdir)
+            UnstackableBranchFormat,
+            get_branch_stacked_on_url, branch.controldir)
 
     def testGetBranchStackedOnUrlNotStacked(self):
         # get_branch_stacked_on_url raises NotStacked if it's called on the
@@ -111,16 +114,16 @@
             branch.get_stacked_on_url()
         except errors.NotStacked:
             pass
-        except errors.UnstackableBranchFormat:
+        except UnstackableBranchFormat:
             raise TestNotApplicable(
                 'This format does not support stacked branches')
         self.assertRaises(
-            errors.NotStacked, get_branch_stacked_on_url, branch.bzrdir)
+            errors.NotStacked, get_branch_stacked_on_url, branch.controldir)
 
     def testGetBranchStackedOnUrlNoBranch(self):
         # get_branch_stacked_on_url raises a NotBranchError if it's called on
         # a bzrdir that's not got a branch.
-        a_bzrdir = self.make_bzrdir('source')
+        a_bzrdir = self.make_controldir('source')
         if a_bzrdir.has_branch():
             raise TestNotApplicable(
                 'This format does not support branchless bzrdirs.')

=== modified file 'lib/lp/codehosting/tests/test_format_comparison.py'
--- lib/lp/codehosting/tests/test_format_comparison.py	2018-01-02 10:54:31 +0000
+++ lib/lp/codehosting/tests/test_format_comparison.py	2019-09-19 21:35:23 +0000
@@ -45,7 +45,7 @@
 class StubBranch:
     """A stub branch object that just has formats."""
     def __init__(self, bzrdir_format, repo_format, branch_format):
-        self.bzrdir = StubObjectWithFormat(bzrdir_format)
+        self.controldir = StubObjectWithFormat(bzrdir_format)
         self.repository = StubObjectWithFormat(repo_format)
         self._format = branch_format
 

=== modified file 'lib/lp/codehosting/tests/test_lpserve.py'
--- lib/lp/codehosting/tests/test_lpserve.py	2012-01-01 02:58:52 +0000
+++ lib/lp/codehosting/tests/test_lpserve.py	2019-09-19 21:35:23 +0000
@@ -5,10 +5,10 @@
 
 __metaclass__ = type
 
-from bzrlib import errors
-from bzrlib.plugins.lpserve.test_lpserve import TestCaseWithSubprocess
-from bzrlib.smart import medium
-from bzrlib.transport import remote
+from breezy import errors
+from breezy.bzr.smart import medium
+from breezy.plugins.lpserve.test_lpserve import TestCaseWithSubprocess
+from breezy.transport import remote
 
 from lp.testing.fixture import CaptureOops
 from lp.testing.layers import LaunchpadLayer
@@ -112,8 +112,8 @@
 
 
 def test_suite():
-    from bzrlib import tests
-    from bzrlib.plugins import lpserve
+    from breezy import tests
+    from breezy.plugins import lpserve
 
     loader = tests.TestLoader()
     suite = loader.loadTestsFromName(__name__)

=== modified file 'lib/lp/codehosting/tests/test_sftp.py'
--- lib/lp/codehosting/tests/test_sftp.py	2017-12-19 17:22:44 +0000
+++ lib/lp/codehosting/tests/test_sftp.py	2019-09-19 21:35:23 +0000
@@ -6,13 +6,13 @@
 from contextlib import closing
 import os
 
-from bzrlib import (
+from breezy import (
     errors as bzr_errors,
     urlutils,
     )
-from bzrlib.tests import TestCaseInTempDir
-from bzrlib.transport import get_transport
-from bzrlib.transport.memory import MemoryTransport
+from breezy.tests import TestCaseInTempDir
+from breezy.transport import get_transport
+from breezy.transport.memory import MemoryTransport
 from lazr.sshserver.sftp import FileIsADirectory
 from testtools.twistedsupport import (
     assert_fails_with,
@@ -70,7 +70,7 @@
     def test_writeChunk(self):
         # writeChunk writes a chunk of data to a file at a given offset.
         filename = 'foo'
-        self.transport.put_bytes(filename, 'content')
+        self.transport.put_bytes(filename, b'content')
         self.transport.writeChunk(filename, 1, 'razy')
         self.assertEqual('crazynt', self.transport.get_bytes(filename))
 
@@ -612,7 +612,7 @@
     def test_openDirectoryMemory(self):
         """openDirectory works on MemoryTransport."""
         transport = MemoryTransport()
-        transport.put_bytes('hello', 'hello')
+        transport.put_bytes('hello', b'hello')
         sftp_server = TransportSFTPServer(AsyncTransport(transport))
         deferred = sftp_server.openDirectory('.')
 

=== modified file 'lib/lp/codehosting/tests/test_upgrade.py'
--- lib/lp/codehosting/tests/test_upgrade.py	2012-09-06 00:01:38 +0000
+++ lib/lp/codehosting/tests/test_upgrade.py	2019-09-19 21:35:23 +0000
@@ -7,18 +7,16 @@
 import logging
 from os.path import dirname
 
-from bzrlib.branch import Branch
-from bzrlib.bzrdir import (
-    BzrDir,
-    format_registry,
-    )
-from bzrlib.plugins.loom.branch import loomify
-from bzrlib.repofmt.groupcompress_repo import (
+from breezy.branch import Branch
+from breezy.bzr.bzrdir import BzrDir
+from breezy.bzr.groupcompress_repo import (
     RepositoryFormat2a,
     RepositoryFormat2aSubtree,
     )
-from bzrlib.revision import NULL_REVISION
-from bzrlib.transport import get_transport
+from breezy.controldir import format_registry
+from breezy.plugins.loom.branch import loomify
+from breezy.revision import NULL_REVISION
+from breezy.transport import get_transport
 from fixtures import TempDir
 
 from lp.code.bzr import (
@@ -51,7 +49,7 @@
             'foo', rev_id='prepare-commit', committer='[e-mail]')
         if loomify_branch:
             loomify(tree.branch)
-            bzr_branch = tree.bzrdir.open_branch()
+            bzr_branch = tree.controldir.open_branch()
         else:
             bzr_branch = tree.branch
         return self.getUpgrader(bzr_branch, branch)
@@ -76,8 +74,8 @@
         :param tree: A Bazaar WorkingTree to add a tree to.
         """
         sub_branch = BzrDir.create_branch_convenience(
-            tree.bzrdir.root_transport.clone('sub').base)
-        tree.add_reference(sub_branch.bzrdir.open_workingtree())
+            tree.controldir.root_transport.clone('sub').base)
+        tree.add_reference(sub_branch.controldir.open_workingtree())
         tree.commit('added tree reference', committer='[e-mail]')
 
     def check_branch(self, upgraded, branch_format=BranchFormat.BZR_BRANCH_7,
@@ -128,7 +126,7 @@
     def test_subtree_format_repo_format(self):
         """Even subtree formats use 2a if they don't have tree references."""
         self.useBzrBranches(direct_database=True)
-        format = format_registry.make_bzrdir('pack-0.92-subtree')
+        format = format_registry.make_controldir('pack-0.92-subtree')
         branch, tree = self.create_branch_and_tree(format=format)
         upgrader = self.getUpgrader(tree.branch, branch)
         with read_locked(upgrader.bzr_branch):
@@ -139,7 +137,7 @@
     def test_tree_reference_repo_format(self):
         """Repos with tree references get 2aSubtree."""
         self.useBzrBranches(direct_database=True)
-        format = format_registry.make_bzrdir('pack-0.92-subtree')
+        format = format_registry.make_controldir('pack-0.92-subtree')
         branch, tree = self.create_branch_and_tree(format=format)
         upgrader = self.getUpgrader(tree.branch, branch)
         self.addTreeReference(tree)
@@ -186,7 +184,7 @@
     def test_has_tree_references(self):
         """Detects whether repo contains actual tree references."""
         self.useBzrBranches(direct_database=True)
-        format = format_registry.make_bzrdir('pack-0.92-subtree')
+        format = format_registry.make_controldir('pack-0.92-subtree')
         branch, tree = self.create_branch_and_tree(format=format)
         upgrader = self.getUpgrader(tree.branch, branch)
         with read_locked(tree.branch.repository):
@@ -198,11 +196,11 @@
     def test_use_subtree_format_for_tree_references(self):
         """Subtree references cause RepositoryFormat2aSubtree to be used."""
         self.useBzrBranches(direct_database=True)
-        format = format_registry.make_bzrdir('pack-0.92-subtree')
+        format = format_registry.make_controldir('pack-0.92-subtree')
         branch, tree = self.create_branch_and_tree(format=format)
         sub_branch = BzrDir.create_branch_convenience(
-            tree.bzrdir.root_transport.clone('sub').base, format=format)
-        tree.add_reference(sub_branch.bzrdir.open_workingtree())
+            tree.controldir.root_transport.clone('sub').base, format=format)
+        tree.add_reference(sub_branch.controldir.open_workingtree())
         tree.commit('added tree reference', committer='[e-mail]')
         upgrader = self.getUpgrader(tree.branch, branch)
         with read_locked(tree.branch):

=== modified file 'lib/lp/codehosting/upgrade.py'
--- lib/lp/codehosting/upgrade.py	2019-06-13 08:53:02 +0000
+++ lib/lp/codehosting/upgrade.py	2019-09-19 21:35:23 +0000
@@ -18,18 +18,16 @@
 from shutil import rmtree
 from tempfile import mkdtemp
 
-from bzrlib.bzrdir import (
-    BzrDir,
-    format_registry,
-    )
-from bzrlib.errors import UpToDateFormat
-from bzrlib.plugins.loom import (
+from breezy.bzr.bzrdir import BzrDir
+from breezy.bzr.groupcompress_repo import RepositoryFormat2aSubtree
+from breezy.controldir import format_registry
+from breezy.errors import UpToDateFormat
+from breezy.plugins.loom import (
     NotALoom,
     require_loom_branch,
     )
-from bzrlib.repofmt.groupcompress_repo import RepositoryFormat2aSubtree
-from bzrlib.upgrade import upgrade
-from bzrlib.url_policy_open import (
+from breezy.upgrade import upgrade
+from breezy.url_policy_open import (
     BranchOpener,
     SingleSchemePolicy,
     )
@@ -75,7 +73,7 @@
         :param branch: The bzr branch to upgrade
         :return: A Metadir format instance.
         """
-        format = format_registry.make_bzrdir('2a')
+        format = format_registry.make_controldir('2a')
         try:
             require_loom_branch(self.bzr_branch)
         except NotALoom:
@@ -205,5 +203,5 @@
     def mirror_branch(self, bzr_branch, target_bd):
         """Mirror the actual branch from a bzr_branch to a target bzrdir."""
         target = target_bd.get_branch_transport(bzr_branch._format)
-        source = bzr_branch.bzrdir.get_branch_transport(bzr_branch._format)
+        source = bzr_branch.controldir.get_branch_transport(bzr_branch._format)
         source.copy_tree_to_transport(target)

=== modified file 'lib/lp/codehosting/vfs/branchfs.py'
--- lib/lp/codehosting/vfs/branchfs.py	2019-05-22 14:57:45 +0000
+++ lib/lp/codehosting/vfs/branchfs.py	2019-09-19 21:35:23 +0000
@@ -29,7 +29,7 @@
 `ITransportDispatch` object.
 
 We hook the `LaunchpadServer` into Bazaar by implementing a
-`AsyncVirtualTransport`, a `bzrlib.transport.Transport` that wraps all of its
+`AsyncVirtualTransport`, a `breezy.transport.Transport` that wraps all of its
 operations so that they are translated by an object that implements
 `translateVirtualPath`.  See transport.py for more information.
 
@@ -58,20 +58,18 @@
 import sys
 import xmlrpclib
 
-from bzrlib import urlutils
-from bzrlib.bzrdir import (
-    BzrDir,
-    BzrDirFormat,
-    )
-from bzrlib.config import TransportConfig
-from bzrlib.errors import (
+from breezy import urlutils
+from breezy.bzr.bzrdir import BzrDir
+from breezy.bzr.smart.request import jail_info
+from breezy.config import TransportConfig
+from breezy.controldir import ControlDirFormat
+from breezy.errors import (
     NoSuchFile,
     PermissionDenied,
     TransportNotPossible,
     )
-from bzrlib.smart.request import jail_info
-from bzrlib.transport import get_transport
-from bzrlib.transport.memory import MemoryServer
+from breezy.transport import get_transport
+from breezy.transport.memory import MemoryServer
 from lazr.uri import URI
 import six
 from twisted.internet import (
@@ -224,7 +222,7 @@
 
         :return: A transport and a path on that transport that point to a
             place that matches the one described in transport_tuple.
-        :rtype: (`bzrlib.transport.Transport`, str)
+        :rtype: (`breezy.transport.Transport`, str)
         """
 
 
@@ -333,7 +331,7 @@
         transport = get_transport(memory_server.get_url())
         if default_stack_on == '':
             return transport
-        format = BzrDirFormat.get_default_format()
+        format = ControlDirFormat.get_default_format()
         bzrdir = format.initialize_on_transport(transport)
         bzrdir.get_config().set_default_stack_on(
             urlutils.unescape(default_stack_on))

=== modified file 'lib/lp/codehosting/vfs/tests/test_branchfs.py'
--- lib/lp/codehosting/vfs/tests/test_branchfs.py	2019-05-22 14:57:45 +0000
+++ lib/lp/codehosting/vfs/tests/test_branchfs.py	2019-09-19 21:35:23 +0000
@@ -12,29 +12,27 @@
 import sys
 import xmlrpclib
 
-from bzrlib import errors
-from bzrlib.bzrdir import (
-    BzrDir,
-    format_registry,
-    )
-from bzrlib.tests import (
+from breezy import errors
+from breezy.bzr.bzrdir import BzrDir
+from breezy.controldir import format_registry
+from breezy.tests import (
     TestCase as BzrTestCase,
     TestCaseInTempDir,
     TestCaseWithTransport,
     )
-from bzrlib.transport import (
+from breezy.transport import (
     _get_protocol_handlers,
     get_transport,
     register_transport,
     Server,
     unregister_transport,
     )
-from bzrlib.transport.chroot import ChrootTransport
-from bzrlib.transport.memory import (
+from breezy.transport.chroot import ChrootTransport
+from breezy.transport.memory import (
     MemoryServer,
     MemoryTransport,
     )
-from bzrlib.urlutils import (
+from breezy.urlutils import (
     escape,
     local_path_to_url,
     )
@@ -142,7 +140,7 @@
             default_stack_on='/~foo/bar/baz')
         self.assertRaises(
             errors.TransportNotPossible,
-            transport.put_bytes, '.bzr/control.conf', 'data')
+            transport.put_bytes, '.bzr/control.conf', b'data')
 
     def test_control_conf_with_stacking(self):
         transport = self.factory._makeControlTransport(
@@ -159,7 +157,7 @@
         transport = self.factory._makeBranchTransport(id=5, writable=False)
         self.assertRaises(
             errors.TransportNotPossible, transport.put_bytes,
-            '.bzr/README', 'data')
+            '.bzr/README', b'data')
 
     def test_writable_implies_writable(self):
         transport = self.factory._makeBranchTransport(id=5, writable=True)
@@ -559,7 +557,7 @@
             transport.put_bytes,
             '~%s/%s/.bzr/control.conf' % (
                 branch.owner.name, branch.product.name),
-            'hello nurse!')
+            b'hello nurse!')
 
     def _makeOnBackingTransport(self, branch):
         """Make directories for 'branch' on the backing transport.
@@ -578,7 +576,7 @@
         branch = self.factory.makeAnyBranch(
             branch_type=BranchType.HOSTED, owner=self.requester)
         backing_transport = self._makeOnBackingTransport(branch)
-        backing_transport.put_bytes('hello.txt', 'Hello World!')
+        backing_transport.put_bytes('hello.txt', b'Hello World!')
         deferred = self._ensureDeferred(
             transport.get_bytes, '%s/.bzr/hello.txt' % branch.unique_name)
         return deferred.addCallback(self.assertEqual, 'Hello World!')
@@ -589,7 +587,7 @@
         branch = self.factory.makeAnyBranch(
             branch_type=BranchType.HOSTED, owner=self.requester)
         backing_transport = self._makeOnBackingTransport(branch)
-        backing_transport.put_bytes('hello.txt', 'Hello World!')
+        backing_transport.put_bytes('hello.txt', b'Hello World!')
         url = escape('%s/.bzr/hello.txt' % branch.unique_name)
         transport = self.getTransport()
         deferred = self._ensureDeferred(transport.get_bytes, url)
@@ -601,7 +599,7 @@
         branch = self.factory.makeAnyBranch(
             branch_type=BranchType.HOSTED, owner=self.requester)
         backing_transport = self._makeOnBackingTransport(branch)
-        data = 'Hello World!'
+        data = b'Hello World!'
         backing_transport.put_bytes('hello.txt', data)
         transport = self.getTransport()
         deferred = self._ensureDeferred(
@@ -622,7 +620,7 @@
         backing_transport = self._makeOnBackingTransport(branch)
         deferred = self._ensureDeferred(
             transport.put_bytes,
-            '%s/.bzr/goodbye.txt' % branch.unique_name, "Goodbye")
+            '%s/.bzr/goodbye.txt' % branch.unique_name, b"Goodbye")
 
         def check_bytes_written(ignored):
             self.assertEqual(
@@ -659,7 +657,7 @@
         branch = self.factory.makeAnyBranch(
             branch_type=BranchType.HOSTED, owner=self.requester)
         backing_transport = self._makeOnBackingTransport(branch)
-        backing_transport.put_bytes('hello.txt', 'Hello World!')
+        backing_transport.put_bytes('hello.txt', b'Hello World!')
         transport = transport.clone('~%s' % branch.owner.name)
         deferred = self._ensureDeferred(
             transport.get_bytes,
@@ -696,7 +694,7 @@
         branch = self.factory.makeAnyBranch(
             branch_type=BranchType.HOSTED, owner=self.requester)
         backing_transport = self._makeOnBackingTransport(branch)
-        backing_transport.put_bytes('hello.txt', 'Hello World!')
+        backing_transport.put_bytes('hello.txt', b'Hello World!')
 
         transport = self.getTransport().clone(branch.unique_name)
 
@@ -735,7 +733,7 @@
         branch = self.factory.makeAnyBranch(
             branch_type=BranchType.HOSTED, owner=self.requester)
         backing_transport = self._makeOnBackingTransport(branch)
-        backing_transport.put_bytes('hello.txt', 'Hello World!')
+        backing_transport.put_bytes('hello.txt', b'Hello World!')
         transport = self.getTransport().clone(branch.unique_name)
         backing_transport = self.backing_transport.clone(
             branch_to_path(branch))
@@ -985,7 +983,7 @@
 
     def assertFormatStringsPassed(self, branch):
         self.assertEqual(1, len(self._branch_changed_log))
-        control_string = branch.bzrdir._format.get_format_string()
+        control_string = branch.controldir._format.get_format_string()
         branch_string = branch._format.get_format_string()
         repository_string = branch.repository._format.get_format_string()
         self.assertEqual(
@@ -1130,7 +1128,7 @@
             self.requester.id, codehosting_api, backing_transport)
         self.lp_transport = get_transport(self.lp_server.get_url())
         self.lp_transport.mkdir(os.path.dirname(self.writable_file))
-        self.lp_transport.put_bytes(self.writable_file, 'Hello World!')
+        self.lp_transport.put_bytes(self.writable_file, b'Hello World!')
 
     def _setUpMemoryServer(self):
         memory_server = MemoryServer()

=== modified file 'lib/lp/codehosting/vfs/tests/test_filesystem.py'
--- lib/lp/codehosting/vfs/tests/test_filesystem.py	2018-01-02 10:54:31 +0000
+++ lib/lp/codehosting/vfs/tests/test_filesystem.py	2019-09-19 21:35:23 +0000
@@ -7,12 +7,12 @@
 
 import stat
 
-from bzrlib import errors
-from bzrlib.bzrdir import BzrDir
-from bzrlib.tests import TestCaseWithTransport
-from bzrlib.transport import get_transport
-from bzrlib.transport.memory import MemoryTransport
-from bzrlib.urlutils import escape
+from breezy import errors
+from breezy.bzr.bzrdir import BzrDir
+from breezy.tests import TestCaseWithTransport
+from breezy.transport import get_transport
+from breezy.transport.memory import MemoryTransport
+from breezy.urlutils import escape
 
 from lp.code.interfaces.branchtarget import IBranchTarget
 from lp.code.interfaces.codehosting import branch_id_alias
@@ -218,7 +218,7 @@
         transport.mkdir(branch_path)
         self.assertRaises(
             errors.PermissionDenied,
-            transport.put_bytes, '%s/README' % branch_path, 'Hello!')
+            transport.put_bytes, '%s/README' % branch_path, b'Hello!')
 
     def test_rename_to_non_bzr_directory_fails(self):
         # Users cannot create an allowed directory (e.g. '.bzr' or
@@ -296,7 +296,7 @@
         # unescape(path).encode('utf-8') != path.
         path = '%41%42%43'
         escaped_path = escape(path)
-        content = 'content'
+        content = b'content'
         transport.put_bytes(escaped_path, content)
 
         # We can use the escaped path to reach the file.

=== modified file 'lib/lp/codehosting/vfs/tests/test_transport.py'
--- lib/lp/codehosting/vfs/tests/test_transport.py	2011-08-12 11:37:08 +0000
+++ lib/lp/codehosting/vfs/tests/test_transport.py	2019-09-19 21:35:23 +0000
@@ -5,14 +5,14 @@
 
 __metaclass__ = type
 
-from bzrlib.tests import per_transport
-from bzrlib.transport import (
+from breezy.tests import per_transport
+from breezy.transport import (
     chroot,
     get_transport,
     Transport,
     )
-from bzrlib.transport.local import LocalTransport
-from bzrlib.urlutils import local_path_to_url
+from breezy.transport.local import LocalTransport
+from breezy.urlutils import local_path_to_url
 
 from lp.codehosting.inmemory import InMemoryFrontend
 from lp.codehosting.tests.helpers import TestResultWrapper

=== modified file 'lib/lp/codehosting/vfs/tests/test_transport_extensions.py'
--- lib/lp/codehosting/vfs/tests/test_transport_extensions.py	2011-08-12 11:37:08 +0000
+++ lib/lp/codehosting/vfs/tests/test_transport_extensions.py	2019-09-19 21:35:23 +0000
@@ -5,7 +5,7 @@
 
 __metaclass__ = type
 
-from bzrlib.transport.memory import MemoryTransport
+from breezy.transport.memory import MemoryTransport
 
 from lp.codehosting.vfs.transport import get_readonly_transport
 from lp.testing import TestCase

=== modified file 'lib/lp/codehosting/vfs/transport.py'
--- lib/lp/codehosting/vfs/transport.py	2019-06-08 05:06:08 +0000
+++ lib/lp/codehosting/vfs/transport.py	2019-09-19 21:35:23 +0000
@@ -5,7 +5,7 @@
 
 The code hosting filesystem is implemented using Bazaar transports. This
 module contains utilities for implementing virtual filesystems using
-bzrlib.transport classes.
+breezy.transport classes.
 """
 
 __metaclass__ = type
@@ -19,14 +19,14 @@
     ]
 
 
-from bzrlib import urlutils
-from bzrlib.errors import (
+from breezy import urlutils
+from breezy.errors import (
     BzrError,
     InProcessTransport,
     NoSuchFile,
     TransportNotPossible,
     )
-from bzrlib.transport import (
+from breezy.transport import (
     chroot,
     get_transport,
     register_transport,
@@ -113,7 +113,7 @@
         This method is called as an errback by `_call`. Use it to translate
         errors from the server into something that users of the transport
         might expect. This could include translating vfs-specific errors into
-        bzrlib errors (e.g. "couldn\'t translate" into `NoSuchFile`) or
+        breezy errors (e.g. "couldn\'t translate" into `NoSuchFile`) or
         translating underlying paths into virtual paths.
 
         :param failure: A `twisted.python.failure.Failure`.
@@ -276,105 +276,105 @@
         return self._async_transport.set_segment_parameter(name, value)
 
     def clone(self, offset=None):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         cloned_async = self._async_transport.clone(offset)
         return SynchronousAdapter(cloned_async)
 
     def external_url(self):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         raise InProcessTransport(self)
 
     def abspath(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return self._async_transport.abspath(relpath)
 
     def append_file(self, relpath, f, mode=None):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(
             self._async_transport.append_file(relpath, f, mode))
 
     def delete(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.delete(relpath))
 
     def delete_tree(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.delete_tree(relpath))
 
     def get(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.get(relpath))
 
     def get_bytes(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.get_bytes(relpath))
 
     def has(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.has(relpath))
 
     def iter_files_recursive(self):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(
             self._async_transport.iter_files_recursive())
 
     def listable(self):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.listable())
 
     def list_dir(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.list_dir(relpath))
 
     def lock_read(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.lock_read(relpath))
 
     def lock_write(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.lock_write(relpath))
 
     def mkdir(self, relpath, mode=None):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.mkdir(relpath, mode))
 
     def open_write_stream(self, relpath, mode=None):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(
             self._async_transport.open_write_stream(relpath, mode))
 
     def put_file(self, relpath, f, mode=None):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(
             self._async_transport.put_file(relpath, f, mode))
 
     def local_realPath(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `lp.codehosting.sftp.FatLocalTransport`."""
         return extract_result(
             self._async_transport.local_realPath(relpath))
 
     def readv(self, relpath, offsets, adjust_for_latency=False,
               upper_limit=None):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(
             self._async_transport.readv(
                 relpath, offsets, adjust_for_latency, upper_limit))
 
     def rename(self, rel_from, rel_to):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(
             self._async_transport.rename(rel_from, rel_to))
 
     def rmdir(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.rmdir(relpath))
 
     def stat(self, relpath):
-        """See `bzrlib.transport.Transport`."""
+        """See `breezy.transport.Transport`."""
         return extract_result(self._async_transport.stat(relpath))
 
     def writeChunk(self, relpath, offset, data):
-        """See `bzrlib.transport.Transport`."""
+        """See `lp.codehosting.sftp.FatLocalTransport`."""
         return extract_result(
             self._async_transport.writeChunk(relpath, offset, data))
 
@@ -394,7 +394,7 @@
 
         :param scheme: The URL scheme to use.
         """
-        # bzrlib's Server class does not have a constructor, so we cannot
+        # breezy's Server class does not have a constructor, so we cannot
         # safely upcall it.
         self._scheme = scheme
         self._is_started = False

=== modified file 'lib/lp/scripts/runlaunchpad.py'
--- lib/lp/scripts/runlaunchpad.py	2019-04-16 14:30:40 +0000
+++ lib/lp/scripts/runlaunchpad.py	2019-09-19 21:35:23 +0000
@@ -202,13 +202,13 @@
         # service.
         if not self.should_launch:
             return
-        from lp.codehosting import get_bzr_path
-        command = [config.root + '/bin/py', get_bzr_path(),
+        from lp.codehosting import get_brz_path
+        command = [config.root + '/bin/py', get_brz_path(),
                    'launchpad-forking-service',
                    '--path', config.codehosting.forking_daemon_socket,
                   ]
         env = dict(os.environ)
-        env['BZR_PLUGIN_PATH'] = config.root + '/bzrplugins'
+        env['BRZ_PLUGIN_PATH'] = config.root + '/brzplugins'
         logfile = self.logfile
         if logfile == '-':
             # This process uses a different logging infrastructure from the
@@ -216,7 +216,7 @@
             # as the logfile. So we just ignore this setting.
             pass
         else:
-            env['BZR_LOG'] = logfile
+            env['BRZ_LOG'] = logfile
         process = subprocess.Popen(command, env=env, stdin=subprocess.PIPE)
         self.addCleanup(stop_process, process)
         process.stdin.close()

=== modified file 'lib/lp/testing/__init__.py'
--- lib/lp/testing/__init__.py	2018-06-25 15:13:32 +0000
+++ lib/lp/testing/__init__.py	2019-09-19 21:35:23 +0000
@@ -81,12 +81,13 @@
 import time
 import unittest
 
-from bzrlib import trace
-from bzrlib.bzrdir import (
-    BzrDir,
+from breezy import trace
+from breezy.controldir import (
+    ControlDir,
     format_registry,
     )
-from bzrlib.transport import get_transport
+from breezy.transport import get_transport
+from bzrlib import trace as bzr_trace
 import fixtures
 from lazr.restful.testing.tales import test_tales
 from lazr.restful.testing.webservice import FakeRequest
@@ -832,11 +833,12 @@
         self._use_bzr_branch_called = False
         # XXX: JonathanLange 2010-12-24 bug=694140: Because of Launchpad's
         # messing with global log state (see
-        # lp.services.scripts.logger), trace._bzr_logger does not
-        # necessarily equal logging.getLogger('bzr'), so we have to explicitly
-        # make it so in order to avoid "No handlers for "bzr" logger'
+        # lp.services.scripts.logger), trace._brz_logger does not
+        # necessarily equal logging.getLogger('brz'), so we have to explicitly
+        # make it so in order to avoid "No handlers for "brz" logger'
         # messages.
-        trace._bzr_logger = logging.getLogger('bzr')
+        trace._brz_logger = logging.getLogger('brz')
+        bzr_trace._bzr_logger = logging.getLogger('bzr')
 
     def getUserBrowser(self, url=None, user=None):
         """Return a Browser logged in as a fresh user, maybe opened at `url`.
@@ -874,8 +876,7 @@
         """
         if format is not None and isinstance(format, basestring):
             format = format_registry.get(format)()
-        return BzrDir.create_branch_convenience(
-            branch_url, format=format)
+        return ControlDir.create_branch_convenience(branch_url, format=format)
 
     def create_branch_and_tree(self, tree_location=None, product=None,
                                db_branch=None, format=None,
@@ -935,6 +936,7 @@
         self.useTempDir()
         # Avoid leaking local user configuration into tests.
         self.useContext(override_environ(
+            BRZ_HOME=os.getcwd(), BRZ_EMAIL=None,
             BZR_HOME=os.getcwd(), BZR_EMAIL=None, EMAIL=None,
             ))
 
@@ -1392,7 +1394,7 @@
             for entry in entries:
                 file_path, file_name, file_type = entry[:3]
                 if file_type == 'file':
-                    stored_file = tree.get_file_by_path(file_path)
+                    stored_file = tree.get_file(file_path)
                     contents[file_path] = stored_file.read()
     finally:
         tree.unlock()

=== modified file 'lib/lp/testing/factory.py'
--- lib/lp/testing/factory.py	2019-09-05 13:23:34 +0000
+++ lib/lp/testing/factory.py	2019-09-19 21:35:23 +0000
@@ -46,8 +46,8 @@
 import uuid
 import warnings
 
-from bzrlib.plugins.builder.recipe import BaseRecipeBranch
-from bzrlib.revision import Revision as BzrRevision
+from breezy.plugins.builder.recipe import BaseRecipeBranch
+from breezy.revision import Revision as BzrRevision
 from cryptography.utils import int_to_bytes
 from lazr.jobrunner.jobrunner import SuspendJobException
 import pytz
@@ -3033,7 +3033,7 @@
         If no branches are passed, return a recipe text that references an
         arbitrary branch.
         """
-        from bzrlib.plugins.builder.recipe import RecipeParser
+        from breezy.plugins.builder.recipe import RecipeParser
         parser = RecipeParser(self.makeRecipeText(*branches))
         return parser.parse()
 

=== modified file 'lib/lp/translations/browser/productseries.py'
--- lib/lp/translations/browser/productseries.py	2018-07-16 00:51:23 +0000
+++ lib/lp/translations/browser/productseries.py	2019-09-19 21:35:23 +0000
@@ -18,7 +18,7 @@
 
 import os.path
 
-from bzrlib.revision import NULL_REVISION
+from breezy.revision import NULL_REVISION
 from zope.component import getUtility
 from zope.publisher.browser import FileUpload
 

=== modified file 'lib/lp/translations/pottery/detect_intltool.py'
--- lib/lp/translations/pottery/detect_intltool.py	2010-10-26 15:47:24 +0000
+++ lib/lp/translations/pottery/detect_intltool.py	2019-09-19 21:35:23 +0000
@@ -26,7 +26,7 @@
 
     Currently this just checks for the existence of POTFILES.in.
 
-    :param tree: A bzrlib.Tree object to search for the intltool structure.
+    :param tree: A breezy.Tree object to search for the intltool structure.
     :returns: True if signs of an intltool structure were found.
     """
     with read_lock_tree(tree):

=== modified file 'lib/lp/translations/pottery/tests/test_detect_intltool.py'
--- lib/lp/translations/pottery/tests/test_detect_intltool.py	2017-05-10 12:43:40 +0000
+++ lib/lp/translations/pottery/tests/test_detect_intltool.py	2019-09-19 21:35:23 +0000
@@ -7,7 +7,7 @@
 import os
 import tarfile
 
-from bzrlib.bzrdir import BzrDir
+from breezy.controldir import ControlDir
 
 from lp.testing import TestCase
 from lp.translations.pottery.detect_intltool import is_intltool_structure
@@ -56,7 +56,7 @@
 class TestDetectIntltoolInBzrTree(TestCase, SetupTestPackageMixin):
 
     def prepare_tree(self):
-        return BzrDir.create_standalone_workingtree(".")
+        return ControlDir.create_standalone_workingtree(".")
 
     def test_detect_intltool_structure(self):
         # Detect a simple intltool structure.

=== modified file 'lib/lp/translations/scripts/tests/test_translations_to_branch.py'
--- lib/lp/translations/scripts/tests/test_translations_to_branch.py	2018-01-02 16:10:26 +0000
+++ lib/lp/translations/scripts/tests/test_translations_to_branch.py	2019-09-19 21:35:23 +0000
@@ -7,7 +7,7 @@
 import re
 from textwrap import dedent
 
-from bzrlib.errors import NotBranchError
+from breezy.errors import NotBranchError
 import pytz
 from testtools.matchers import MatchesRegex
 import transaction
@@ -193,7 +193,7 @@
         self.assertTrue("GruesomeException" in message)
 
     def test_exportToBranches_handles_unpushed_branches(self):
-        # bzrlib raises NotBranchError when accessing a nonexistent
+        # breezy raises NotBranchError when accessing a nonexistent
         # branch.  The exporter deals with that by calling
         # _handleUnpushedBranch.
         exporter = ExportTranslationsToBranch(test_args=[])

=== modified file 'lib/lp/translations/scripts/translations_to_branch.py'
--- lib/lp/translations/scripts/translations_to_branch.py	2019-07-25 15:00:18 +0000
+++ lib/lp/translations/scripts/translations_to_branch.py	2019-09-19 21:35:23 +0000
@@ -17,8 +17,8 @@
 # line below this comment.
 import lp.codehosting
 
-from bzrlib.errors import NotBranchError
-from bzrlib.revision import NULL_REVISION
+from breezy.errors import NotBranchError
+from breezy.revision import NULL_REVISION
 import pytz
 from storm.expr import (
     And,

=== modified file 'lib/lp/translations/tests/test_rosetta_branches_script.py'
--- lib/lp/translations/tests/test_rosetta_branches_script.py	2013-07-04 06:28:58 +0000
+++ lib/lp/translations/tests/test_rosetta_branches_script.py	2019-09-19 21:35:23 +0000
@@ -9,7 +9,7 @@
 
 __metaclass__ = type
 
-from bzrlib.revision import NULL_REVISION
+from breezy.revision import NULL_REVISION
 import transaction
 from zope.component import getUtility
 
@@ -43,11 +43,11 @@
         self.useBzrBranches()
         pot_content = self.factory.getUniqueString()
         branch, tree = self.create_branch_and_tree()
-        tree.bzrdir.root_transport.put_bytes(pot_path, pot_content)
+        tree.controldir.root_transport.put_bytes(pot_path, pot_content)
         tree.add(pot_path)
         # XXX: AaronBentley 2010-08-06 bug=614404: a bzr username is
         # required to generate the revision-id.
-        with override_environ(BZR_EMAIL='[e-mail]'):
+        with override_environ(BRZ_EMAIL='[e-mail]'):
             revision_id = tree.commit("first commit")
         branch.last_scanned_id = revision_id
         branch.last_mirrored_id = revision_id

=== modified file 'lib/lp_sitecustomize.py'
--- lib/lp_sitecustomize.py	2019-03-09 09:26:01 +0000
+++ lib/lp_sitecustomize.py	2019-09-19 21:35:23 +0000
@@ -77,11 +77,12 @@
     amqp_logger.propagate = False
 
 
-def silence_bzr_logger():
-    """Install the NullHandler on the bzr logger to silence logs."""
-    bzr_logger = logging.getLogger('bzr')
-    bzr_logger.addHandler(logging.NullHandler())
-    bzr_logger.propagate = False
+def silence_bzr_loggers():
+    """Install the NullHandler on the bzr/brz loggers to silence logs."""
+    for logger_name in ('bzr', 'brz'):
+        logger = logging.getLogger(logger_name)
+        logger.addHandler(logging.NullHandler())
+        logger.propagate = False
 
 
 def silence_swiftclient_logger():
@@ -154,7 +155,7 @@
     logging between tests.
     """
     silence_amqp_logger()
-    silence_bzr_logger()
+    silence_bzr_loggers()
     silence_zcml_logger()
     silence_transaction_logger()
     silence_swiftclient_logger()
@@ -185,3 +186,9 @@
     # through actually using itertools.groupby.
     grouper = type(list(itertools.groupby([0]))[0][1])
     checker.BasicTypes[grouper] = checker._iteratorChecker
+
+    # XXX 2019-09-17: git must be disabled until codeimport is upgraded,
+    # since the required dulwich versions for our current version of bzr-git
+    # and for Breezy are incompatible in both directions.
+    import types
+    sys.modules['breezy.git'] = types.ModuleType('breezy.git')

=== modified file 'scripts/mirror-branch.py'
--- scripts/mirror-branch.py	2013-01-07 02:40:55 +0000
+++ scripts/mirror-branch.py	2019-09-19 21:35:23 +0000
@@ -33,7 +33,7 @@
 import resource
 import sys
 
-import bzrlib.repository
+import breezy.repository
 
 from lp.code.enums import BranchType
 from lp.codehosting.puller.worker import (
@@ -54,24 +54,7 @@
     # XXX DavidAllouche 2006-01-29:
     # Quick hack to disable the deprecation warning for old repository
     # formats.
-    bzrlib.repository._deprecation_warning_done = True
-
-
-def force_bzr_to_use_urllib():
-    # These lines prevent bzr from using pycurl to connect to http: urls.  We
-    # want this for two reasons:
-    # 1) pycurl rejects self signed certificates, which prevents a significant
-    #    number of mirror branchs from updating, and
-    # 2) the script sometimes hangs inside pycurl, preventing all mirrors from
-    #    being updated until the script is restarted.
-    # There is no test for this (it would involve a great number of moving
-    # parts) but it has been verified to work on production.  Also see
-    # https://bugs.launchpad.net/bzr/+bug/82086
-    from bzrlib.transport import register_lazy_transport
-    register_lazy_transport('http://', 'bzrlib.transport.http._urllib',
-                            'HttpTransport_urllib')
-    register_lazy_transport('https://', 'bzrlib.transport.http._urllib',
-                            'HttpTransport_urllib')
+    breezy.repository._deprecation_warning_done = True
 
 
 if __name__ == '__main__':
@@ -86,7 +69,6 @@
     section_name = 'supermirror_%s_puller' % branch_type_map[branch_type]
     globalErrorUtility.configure(section_name)
     shut_up_deprecation_warning()
-    force_bzr_to_use_urllib()
 
     resource.setrlimit(resource.RLIMIT_AS, (1500000000, 1500000000))
 

=== modified file 'scripts/update-stacked-on.py'
--- scripts/update-stacked-on.py	2013-01-07 02:40:55 +0000
+++ scripts/update-stacked-on.py	2019-09-19 21:35:23 +0000
@@ -23,9 +23,10 @@
 from collections import namedtuple
 import sys
 
-from bzrlib import errors
-from bzrlib.bzrdir import BzrDir
-from bzrlib.config import TransportConfig
+from breezy import errors
+from breezy.branch import UnstackableBranchFormat
+from breezy.bzr.bzrdir import BzrDir
+from breezy.config import TransportConfig
 
 from lp.code.interfaces.codehosting import branch_id_alias
 from lp.codehosting.bzrutils import get_branch_stacked_on_url
@@ -109,7 +110,7 @@
             self.logger.warn(
                 "Branch for %r at %r is not stacked at all. Giving up."
                 % (branch_id, bzr_branch_url))
-        except errors.UnstackableBranchFormat:
+        except UnstackableBranchFormat:
             self.logger.error(
                 "Branch for %r at %r is unstackable. Giving up."
                 % (branch_id, bzr_branch_url))

=== modified file 'setup.py'
--- setup.py	2019-08-23 10:06:34 +0000
+++ setup.py	2019-09-19 21:35:23 +0000
@@ -149,6 +149,7 @@
         'backports.lzma',
         'BeautifulSoup',
         'beautifulsoup4[lxml]',
+        'breezy',
         'bzr',
         'celery',
         'cssselect',
@@ -277,6 +278,7 @@
         'zope.vocabularyregistry',
         # Loggerhead dependencies. These should be removed once
         # bug 383360 is fixed and we include it as a source dist.
+        'bleach',
         'Paste',
         'PasteDeploy',
         'SimpleTAL',

=== modified file 'utilities/create-lp-wadl-and-apidoc.py'
--- utilities/create-lp-wadl-and-apidoc.py	2016-09-14 11:13:06 +0000
+++ utilities/create-lp-wadl-and-apidoc.py	2019-09-19 21:35:23 +0000
@@ -18,8 +18,8 @@
 import subprocess
 import sys
 
-import bzrlib
-from bzrlib.branch import Branch
+import breezy
+from breezy.branch import Branch
 from lazr.restful.interfaces import IWebServiceConfiguration
 from z3c.ptcompat import PageTemplateFile
 from zope.component import getUtility
@@ -144,7 +144,7 @@
             ["git", "log", "-1", "--format=%ct", "HEAD"],
             universal_newlines=True))
     else:
-        with bzrlib.initialize():
+        with breezy.get_global_state():
             branch = Branch.open(top)
             timestamp = branch.repository.get_revision(
                 branch.last_revision()).timestamp

=== modified file 'utilities/sourcedeps.cache'
--- utilities/sourcedeps.cache	2019-07-09 12:32:22 +0000
+++ utilities/sourcedeps.cache	2019-09-19 21:35:23 +0000
@@ -1,16 +1,16 @@
 {
-    "bzr-builder": [
-        70, 
-        "[e-mail]-20111114140506-6bmt9isw6lcud7yt"
+    "brz-builder": [
+        180, 
+        "[e-mail]-20180624153632-1f0weftl0pawz6wj"
+    ], 
+    "brz-loom": [
+        164, 
+        "[e-mail]-20190613193059-rmsz6mcj33cj1rod"
     ], 
     "bzr-git": [
         280, 
         "[e-mail]-20171222005919-u98ut0f5z2g618um"
     ], 
-    "bzr-loom": [
-        55, 
-        "[e-mail]-20120830090804-cg49kky93htwax7s"
-    ], 
     "bzr-svn": [
         2725, 
         "[e-mail]-20130816045016-wzr810hu2z459t4y"
@@ -24,8 +24,8 @@
         "[e-mail]-20190614154330-091l9edcnubsjmsx"
     ], 
     "loggerhead": [
-        493, 
-        "[e-mail]-20190621112125-3aaxj3hrmty19lr6"
+        494, 
+        "[e-mail]-20190919081036-q1symc2h2iedtlh3"
     ], 
     "mailman": [
         977, 

=== modified file 'utilities/sourcedeps.conf'
--- utilities/sourcedeps.conf	2019-07-09 12:32:22 +0000
+++ utilities/sourcedeps.conf	2019-09-19 21:35:23 +0000
@@ -7,13 +7,13 @@
 ####  DEPRECATED. NO NEW ITEMS. NO NO NO NO NO NONONONONO
 #########################################################
 
-bzr-builder lp:~launchpad-pqm/bzr-builder/trunk;revno=70
+brz-builder lp:~jelmer/brz-builder/trunk;revno=180
+brz-loom lp:~jelmer/brz-loom/trunk;revno=164
 bzr-git lp:~launchpad-pqm/bzr-git/devel;revno=280
-bzr-loom lp:~launchpad-pqm/bzr-loom/trunk;revno=55
 bzr-svn lp:~launchpad-pqm/bzr-svn/devel;revno=2725
 cscvs lp:~launchpad-pqm/launchpad-cscvs/devel;revno=433
 difftacular lp:~launchpad/difftacular/trunk;revno=11
-loggerhead lp:~loggerhead-team/loggerhead/trunk-rich;revno=493
+loggerhead lp:~loggerhead-team/loggerhead/trunk-rich;revno=494
 mailman lp:~launchpad-pqm/mailman/2.1;revno=977
 old_xmlplus lp:~launchpad-pqm/dtdparser/trunk;revno=4
 pygettextpo lp:~launchpad-pqm/pygettextpo/trunk;revno=25