Merge lp:~cjwatson/launchpad/bugzilla-without-credentials into lp:launchpad

[Colin Watson]

Don't attempt comment pushing or back-linking for BugzillaAPI instances without credentials.

[William Grant (wgrant)]

review: Approve (code)

=== modified file 'lib/lp/bugs/doc/externalbugtracker-bugzilla-api.txt'
--- lib/lp/bugs/doc/externalbugtracker-bugzilla-api.txt	2017-10-20 11:07:01 +0000
+++ lib/lp/bugs/doc/externalbugtracker-bugzilla-api.txt	2017-10-24 18:14:16 +0000
@@ -595,6 +595,15 @@
     >>> verifyObject(ISupportsCommentPushing, bugzilla)
     True
 
+If an instance of BugzillaAPI does not have suitable credentials set up,
+then that instance does not provide ISupportsCommentPushing.
+
+    >>> verifyObject(ISupportsCommentPushing, BugzillaAPI(
+    ...     'http://unknown.example.com/', xmlrpc_transport=test_transport))
+    Traceback (most recent call last):
+    ...
+    DoesNotImplement: ...
+
 ISupportsCommentPushing.addRemoteComment() is the method used to push a
 comment to the remote server. It takes three parameters: the remote bug
 ID, the body of the comment to push and the rfc822msgid of the comment
@@ -647,6 +656,15 @@
     >>> verifyObject(ISupportsBackLinking, bugzilla)
     True
 
+If an instance of BugzillaAPI does not have suitable credentials set up,
+then that instance does not provide ISupportsBackLinking.
+
+    >>> verifyObject(ISupportsBackLinking, BugzillaAPI(
+    ...     'http://unknown.example.com/', xmlrpc_transport=test_transport))
+    Traceback (most recent call last):
+    ...
+    DoesNotImplement: ...
+
 BugzillaAPI.setLaunchpadBugId() can be used to set the Launchpad bug ID
 for a given bug.
 
 
=== modified file 'lib/lp/bugs/externalbugtracker/bugzilla.py'
--- lib/lp/bugs/externalbugtracker/bugzilla.py	2017-10-24 08:26:00 +0000
+++ lib/lp/bugs/externalbugtracker/bugzilla.py	2017-10-24 18:14:16 +0000
@@ -23,7 +23,10 @@
 import pytz
 import six
 from zope.component import getUtility
-from zope.interface import implementer
+from zope.interface import (
+    alsoProvides,
+    implementer,
+    )
 
 from lp.bugs.externalbugtracker.base import (
     BugNotFound,
@@ -551,8 +554,7 @@
     return decorator
 
 
-@implementer(
-    ISupportsBackLinking, ISupportsCommentImport, ISupportsCommentPushing)
+@implementer(ISupportsCommentImport)
 class BugzillaAPI(Bugzilla):
     """An `ExternalBugTracker` to handle Bugzillas that offer an API."""
 
@@ -570,6 +572,14 @@
         else:
             self.xmlrpc_transport = xmlrpc_transport
 
+        try:
+            self.credentials
+        except BugTrackerAuthenticationError:
+            pass
+        else:
+            alsoProvides(self, ISupportsBackLinking)
+            alsoProvides(self, ISupportsCommentPushing)
+
     def getExternalBugTrackerToUse(self):
         """The Bugzilla API has been chosen, so return self."""
         return self
 
=== modified file 'lib/lp/bugs/scripts/checkwatches/tests/test_bugwatchupdater.py'
--- lib/lp/bugs/scripts/checkwatches/tests/test_bugwatchupdater.py	2012-01-01 02:58:52 +0000
+++ lib/lp/bugs/scripts/checkwatches/tests/test_bugwatchupdater.py	2017-10-24 18:14:16 +0000
@@ -1,4 +1,4 @@
-# Copyright 2010 Canonical Ltd.  This software is licensed under the
+# Copyright 2010-2017 Canonical Ltd.  This software is licensed under the
 # GNU Affero General Public License version 3 (see the file LICENSE).
 
 """Tests for the checkwatches.bugwatchupdater module."""
@@ -223,7 +223,7 @@
         #     This test can be removed when bug 578714 is fixed.
         remote_bug_updater = RemoteBugUpdater(
             self.checkwatches_master,
-            BugzillaAPI("http://example.com"),
+            BugzillaAPI("http://bugzilla-3.4.example.com"),
             self.bug_watch.remotebug, [self.bug_watch.id],
             [], datetime.now())
         bug_watch_updater = LoggingBugWatchUpdater(