Merge ~jugmac00/launchpad-layers:split-out-turnip-layers into launchpad-layers:main

[Jürgen Gmach]

Split out turnip layers

[Colin Watson (cjwatson)]

Could you run `pre-commit run -a` over this as a separate commit (and make sure the results look sensible, of course)? turnip doesn't use autoformatting yet, so this will introduce a number of changes.

Otherwise LGTM.

review: Approve

diff --git a/turnip-base/config.yaml b/turnip-base/config.yaml
new file mode 100644
index 0000000..1919b6d
--- /dev/null
+++ b/turnip-base/config.yaml
@@ -0,0 +1,93 @@
+options:
+  build_label:
+    type: string
+    default: ""
+    description: Build label to run.
+  nagios_context:
+    default: "juju"
+    type: string
+    description: |
+      Used by the nrpe-external-master subordinate charm.
+      A string that will be prepended to instance name to set the host name
+      in nagios. So for instance the hostname would be something like -
+        juju-turnip-0
+      If you're running multiple environments with the same services in them
+      this allows you to differentiate between them.
+  base_dir:
+    type: string
+    default: '/srv/turnip'
+    description: Root checkout/srv directory.
+  user:
+    type: string
+    default: turnip
+    description: The service will run as this user.
+  user_id:
+    type: int
+    default: 1002
+    description: >
+      The service user will be created with this ID.  Fixing this value
+      ensures that a storage volume can be used consistently across multiple
+      units.
+  group:
+    type: string
+    default: turnip
+    description: The service will run under this group.
+  group_id:
+    type: int
+    default: 1002
+    description: >
+      The service group will be created with this ID.  Fixing this value
+      ensures that a storage volume can be used consistently across multiple
+      units.
+  log_hosts_allow:
+    type: string
+    default: ""
+    description: >
+      Hosts that should be allowed to rsync logs. Note that this relies on
+      basenode.
+  swift_username:
+    type: string
+    default: ""
+    description: Username to use when accessing Swift.
+  swift_password:
+    type: string
+    default: ""
+    description: Password to use when accessing Swift.
+  swift_auth_url:
+    type: string
+    default: ""
+    description: URL for authenticating against Keystone.
+  swift_storage_url:
+    type: string
+    default: ""
+    description: URL for fetching from Swift (for anonymous access).
+  swift_region_name:
+    type: string
+    default: ""
+    description: Swift region.
+  swift_tenant_name:
+    type: string
+    default: ""
+    description: Entity that owns resources.
+  swift_container_name:
+    type: string
+    default: ""
+    description: Container to put objects in.
+  haproxy_service_options:
+    type: string
+    description: HAProxy service options.
+    default: |
+      - mode tcp
+      - option tcplog
+      - balance leastconn
+  haproxy_server_options:
+    type: string
+    description: HAProxy server options.
+    default: check
+  # layer-apt
+  install_sources:
+    default: |
+      - ppa:launchpad/ppa
+  install_keys:
+    default: |
+      - null  # PPA keys securely added via Launchpad.
diff --git a/turnip-base/copyright b/turnip-base/copyright
new file mode 100644
index 0000000..605c5df
--- /dev/null
+++ b/turnip-base/copyright
@@ -0,0 +1,676 @@
+turnip is Copyright 2014-2018 Canonical Ltd.
+
+Canonical Ltd ("Canonical") distributes the turnip source code
+under the GNU Affero General Public License, version 3 ("AGPLv3").
+The full text of this licence is given below.
+
+Third-party copyright in this distribution is noted where applicable.
+
+All rights not expressly granted are reserved.
+
+=========================================================================
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+                   GNU AFFERO GENERAL PUBLIC LICENSE
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+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
+
+=========================================================================
diff --git a/turnip-base/icon.svg b/turnip-base/icon.svg
new file mode 100644
index 0000000..b7920cc
--- /dev/null
+++ b/turnip-base/icon.svg
@@ -0,0 +1,159 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="100px"
+   height="100px"
+   viewBox="0 0 100 100"
+   version="1.1"
+   id="svg18"
+   sodipodi:docname="lp-charm-icon.svg"
+   inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <metadata
+     id="metadata22">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title>eclispe-che</dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1016"
+     id="namedview20"
+     showgrid="false"
+     inkscape:pagecheckerboard="true"
+     inkscape:zoom="1.668772"
+     inkscape:cx="29.156684"
+     inkscape:cy="41.621867"
+     inkscape:window-x="0"
+     inkscape:window-y="27"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer2"
+     inkscape:snap-bbox="false"
+     inkscape:snap-bbox-midpoints="true"
+     inkscape:snap-object-midpoints="true" />
+  <!-- Generator: Sketch 45.2 (43514) - http://www.bohemiancoding.com/sketch -->
+  <title
+     id="title2">eclispe-che</title>
+  <desc
+     id="desc4">Created with Sketch.</desc>
+  <defs
+     id="defs7">
+    <path
+       d="M50.0004412,4.04252804e-14 C22.3871247,4.04252804e-14 0,22.3848726 0,49.9995588 C0,77.6133626 22.3871247,100 50.0004412,100 C77.6137577,100 100,77.6133626 100,49.9995588 C100,22.3848726 77.6128753,3.55271368e-14 50.0004412,4.04252804e-14 Z"
+       id="path-1" />
+    <style
+       id="style6"
+       type="text/css">
+   
+    .fil0 {fill:#F8C300}
+    .fil6 {fill:#3895BD}
+    .fil3 {fill:#3941BF}
+    .fil1 {fill:#8FB635}
+    .fil4 {fill:#A02C35}
+    .fil7 {fill:#BB3A84}
+    .fil5 {fill:#D18C3B}
+    .fil8 {fill:#72706F;fill-rule:nonzero}
+    .fil9 {fill:#F8C300;fill-rule:nonzero}
+    .fil2 {fill:white;fill-rule:nonzero}
+   
+  </style>
+  </defs>
+  <g
+     inkscape:groupmode="layer"
+     id="layer1"
+     inkscape:label="BACKGROUND">
+    <g
+       style="fill:#ffffff;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-width:1;stroke-opacity:1"
+       id="Page-1">
+      <g
+         id="eclispe-che"
+         style="fill:#ffffff;fill-opacity:1;stroke:none;stroke-opacity:1">
+        <g
+           id="path3023-path"
+           style="fill:#ffffff;fill-opacity:1;stroke:none;stroke-opacity:1">
+          <use
+             xlink:href="#path-1"
+             id="use9"
+             style="fill:#ffffff;fill-opacity:1;fill-rule:evenodd;stroke:none;stroke-opacity:1"
+             x="0"
+             y="0"
+             width="100%"
+             height="100%" />
+          <path
+             d="M 50.000441,0.5 C 22.662621,0.5 0.5,22.661661 0.5,49.999559 0.5,77.337051 22.663098,99.5 50.000441,99.5 77.337613,99.5 99.5,77.337222 99.5,49.999559 99.5,22.661796 77.337514,0.5 50.000441,0.5 Z"
+             id="path11"
+             style="fill:#ffffff;fill-opacity:1;stroke:none;stroke-width:1;stroke-opacity:1"
+             inkscape:connector-curvature="0" />
+        </g>
+      </g>
+    </g>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer2"
+     inkscape:label="PLACE LOGO HERE">
+    <g
+       style="fill-rule:evenodd"
+       id="g3473"
+       transform="matrix(3.2292607,0,0,3.2292607,-486.24769,-600.53027)">
+      <g
+         id="g3489">
+        <path
+           inkscape:connector-curvature="0"
+           style="fill:#3895bd;fill-opacity:1;fill-rule:evenodd"
+           d="m 165.22326,188.53265 -9.92868,5.72521 4.76477,2.75658 5.15144,-2.96862 z"
+           id="path3475" />
+        <path
+           inkscape:connector-curvature="0"
+           style="fill:#8fb635;fill-opacity:1;fill-rule:evenodd"
+           d="m 166.90714,188.53265 v 5.51317 l 5.15144,2.96862 4.77724,-2.75658 z"
+           id="path3477" />
+        <path
+           inkscape:connector-curvature="0"
+           style="fill:#f8c300;fill-rule:evenodd"
+           d="m 166.05897,195.50518 -5.15144,2.96863 v 5.96219 l 5.15144,2.95616 5.15143,-2.95616 v -5.96219 z"
+           id="path3479" />
+        <path
+           inkscape:connector-curvature="0"
+           style="fill:#d18c3b;fill-opacity:1;fill-rule:evenodd"
+           d="m 177.67153,195.71723 -4.77724,2.76905 v 5.93725 l 4.77724,2.75658 z"
+           id="path3481" />
+        <path
+           inkscape:connector-curvature="0"
+           style="fill:#3941bf;fill-opacity:1;fill-rule:evenodd"
+           d="m 154.4464,195.7297 v 11.45041 l 4.77724,-2.75658 v -5.94972 z"
+           id="path3483" />
+        <path
+           inkscape:connector-curvature="0"
+           style="fill:#bb3a84;fill-opacity:1;fill-rule:evenodd"
+           d="m 160.05935,205.8829 -4.76477,2.75658 9.91621,5.73768 V 208.864 l -5.13897,-2.9811 z"
+           id="path3485" />
+        <path
+           inkscape:connector-curvature="0"
+           style="fill:#a02c35;fill-opacity:1;fill-rule:evenodd"
+           d="m 172.05858,205.89537 -5.15144,2.96863 v 5.51316 l 9.91621,-5.73768 z"
+           id="path3487" />
+      </g>
+    </g>
+  </g>
+</svg>
diff --git a/turnip-base/layer.yaml b/turnip-base/layer.yaml
new file mode 100644
index 0000000..52adc56
--- /dev/null
+++ b/turnip-base/layer.yaml
@@ -0,0 +1,10 @@
+includes:
+    - layer:basic
+    - layer:apt
+    - layer:status
+    - interface:http
+    - interface:nrpe-external-master
+repo: https://git.launchpad.net/turnip
+options:
+    basic:
+        use_venv: true
diff --git a/turnip-base/lib/charms/turnip/base.py b/turnip-base/lib/charms/turnip/base.py
new file mode 100644
index 0000000..cbb736f
--- /dev/null
+++ b/turnip-base/lib/charms/turnip/base.py
@@ -0,0 +1,416 @@
+# Copyright 2018 Canonical Ltd.  This software is licensed under the
+# GNU Affero General Public License version 3 (see the file LICENSE).
+
+
+import errno
+import os.path
+import shutil
+import subprocess
+
+import yaml
+from charmhelpers.core import hookenv, host, templating
+from charmhelpers.fetch import apt_install
+from charmhelpers.payload import archive
+from charms.layer import status
+from charms.reactive import endpoint_from_name
+
+
+def base_dir():
+    return hookenv.config()["base_dir"]
+
+
+def payloads_dir():
+    return os.path.join(base_dir(), hookenv.application_name(), "payloads")
+
+
+def code_dir():
+    return os.path.join(base_dir(), hookenv.application_name(), "code")
+
+
+def venv_dir():
+    return os.path.join(code_dir(), "env")
+
+
+def logs_dir():
+    return os.path.join(base_dir(), "logs")
+
+
+def data_dir():
+    return os.path.join(base_dir(), "data")
+
+
+def run_dir():
+    return os.path.join(base_dir(), hookenv.application_name(), "run")
+
+
[e-mail]
+def data_mount_unit():
+    return (
+        subprocess.check_output(
+            ["systemd-escape", "--path", data_dir()], text=True
+        ).rstrip("\n")
+        + ".mount"
+    )
+
+
+def keys_dir():
+    return os.path.join(base_dir(), "keys")
+
+
+def nrpe_dir():
+    return os.path.join(base_dir(), hookenv.application_name(), "nrpe")
+
+
+def user():
+    return hookenv.config()["user"]
+
+
+def user_id():
+    return hookenv.config()["user_id"]
+
+
+def group():
+    return hookenv.config()["group"]
+
+
+def group_id():
+    return hookenv.config()["group_id"]
+
+
+def ensure_user(username, groupname, uid=None, gid=None):
+    if not host.user_exists(username):
+        hookenv.log(f"Creating {username} user and group")
+        password = host.pwgen()
+        if not host.group_exists(groupname):
+            host.add_group(groupname, gid=gid)
+        host.adduser(username, password, primary_group=groupname, uid=uid)
+
+
+def ensure_directories():
+    for dir in (base_dir(), payloads_dir()):
+        host.mkdir(dir, perms=0o755)
+    for dir in (logs_dir(), data_dir(), keys_dir(), run_dir()):
+        host.mkdir(dir, owner=user(), group=group(), perms=0o755)
+
+
+def get_swift_creds(config):
+    return {
+        "user": config["swift_username"],
+        "project": config["swift_tenant_name"],
+        "password": config["swift_password"],
+        "authurl": config["swift_auth_url"],
+        "region": config["swift_region_name"],
+        "storageurl": config["swift_storage_url"],
+    }
+
+
+def swift_base_cmd(**swift_creds):
+    return [
+        "swift",
+        "--os-username=" + swift_creds["user"],
+        "--os-tenant-name=" + swift_creds["project"],
+        "--os-password=" + swift_creds["password"],
+        "--os-auth-url=" + swift_creds["authurl"],
+        "--os-region-name=" + swift_creds["region"],
+    ]
+
+
+def swift_fetch(source, target, container=None, **swift_creds):
+    if swift_creds["user"]:
+        cmd = swift_base_cmd(**swift_creds) + [
+            "download",
+            "--output=" + target,
+            container,
+            source,
+        ]
+    else:
+        storage_url = swift_creds["storageurl"]
+        assert storage_url
+        cmd = [
+            "wget",
+            "-O",
+            target,
+            f"{storage_url}/{container}/{source}",
+        ]
+    subprocess.check_call(cmd)
+
+
+def unlink_force(path):
+    """Unlink path, without worrying about whether it exists."""
+    try:
+        os.unlink(path)
+    except OSError as e:
+        if e.errno != errno.ENOENT:
+            raise
+
+
+def symlink_force(source, link_name):
+    """Create symlink link_name -> source, even if link_name exists."""
+    unlink_force(link_name)
+    os.symlink(source, link_name)
+
+
+def install_packages():
+    if hookenv.config()["swift_username"]:
+        apt_install("python3-swiftclient", fatal=True)
+
+
+def install_payload_packages(target_dir):
+    system_deps_path = os.path.join(target_dir, "system-dependencies.txt")
+    if not os.path.exists(system_deps_path):
+        return
+    hookenv.log("Installing system packages required by payload")
+    with open(system_deps_path) as system_deps_file:
+        system_deps = system_deps_file.read().split()
+    apt_install(system_deps, fatal=True)
+
+
+def install_python_packages(target_dir):
+    hookenv.log("Installing Python dependencies")
+    subprocess.check_call(
+        [
+            "sudo",
+            "make",
+            "-C",
+            target_dir,
+            "build",
+            "PIP_SOURCE_DIR=%s" % os.path.join(target_dir, "pip-cache"),
+        ]
+    )
+
+
+def prune_payloads(keep):
+    for entry in os.listdir(payloads_dir()):
+        if entry in keep:
+            continue
+        entry_path = os.path.join(payloads_dir(), entry)
+        if os.path.isdir(entry_path):
+            hookenv.log(f"Purging old build in {entry_path}")
+            shutil.rmtree(entry_path)
+
+
+class PayloadError(Exception):
+    pass
+
+
+def install_payload():
+    config = hookenv.config()
+    current_build_label = None
+    if os.path.islink(code_dir()):
+        current_build_label = os.path.basename(os.path.realpath(code_dir()))
+    desired_build_label = config["build_label"]
+    if not desired_build_label:
+        raise PayloadError("Build label unset, so cannot deploy code")
+    if current_build_label == desired_build_label:
+        hookenv.log(f"Build {desired_build_label} already deployed")
+        return
+    hookenv.log(f"Deploying build {desired_build_label}...")
+
+    # Copy source archive
+    archive_path = os.path.join(
+        payloads_dir(), desired_build_label + ".tar.gz"
+    )
+    object_name = os.path.join(desired_build_label, "turnip.tar.gz")
+
+    try:
+        if config["swift_container_name"]:
+            swift_creds = get_swift_creds(config)
+            swift_container = config["swift_container_name"]
+            swift_fetch(
+                os.path.join("turnip-builds", object_name),
+                archive_path,
+                container=swift_container,
+                **swift_creds,
+            )
+        else:
+            resource_path = hookenv.resource_get("turnip")
+            if resource_path and os.path.getsize(resource_path):
+                with open(resource_path, "rb") as resource:
+                    host.write_file(archive_path, resource.read(), perms=0o644)
+            else:
+                raise PayloadError("No build available, so cannot deploy code")
+
+        # Unpack source
+        target_dir = os.path.join(payloads_dir(), desired_build_label)
+        if os.path.isdir(target_dir):
+            shutil.rmtree(target_dir)
+        archive.extract_tarfile(archive_path, target_dir)
+        os.chown(target_dir, 0, 0)
+        host.lchownr(target_dir, "root", "root")
+
+        install_payload_packages(target_dir)
+        install_python_packages(target_dir)
+
+        symlink_force(
+            os.path.relpath(target_dir, os.path.dirname(code_dir())),
+            code_dir(),
+        )
+        prune_payloads([desired_build_label, current_build_label])
+    finally:
+        unlink_force(archive_path)
+
+
+def configure_rsync():
+    config = hookenv.config()
+    if config["log_hosts_allow"]:
+        templating.render(
+            "turnip-rsync.j2",
+            "/etc/rsync-juju.d/010-turnip.conf",
+            config,
+            perms=0o644,
+        )
+        if not host.service_restart("rsync"):
+            raise RuntimeError("Failed to restart rsync")
+
+
+def install_services():
+    install_payload()
+    version_info_path = os.path.join(code_dir(), "turnip", "version_info.py")
+    if os.path.exists(version_info_path):
+        version_info_locals = {}
+        with open(version_info_path) as version_info_file:
+            exec(version_info_file.read(), {}, version_info_locals)
+        revision_id = version_info_locals.get("version_info", {}).get(
+            "revision_id"
+        )
+        if revision_id is not None:
+            hookenv.application_version_set(revision_id)
+    configure_rsync()
+
+
+def configure_logrotate(config):
+    templating.render(
+        "logrotate.j2",
+        os.path.join("/etc/logrotate.d", hookenv.application_name()),
+        config,
+        perms=0o644,
+    )
+
+
+def reload_systemd():
+    subprocess.check_call(["systemctl", "daemon-reload"])
+
+
+def configure_service(service_name=None):
+    config = hookenv.config()
+    if service_name is not None:
+        context = dict(config)
+        context["code_dir"] = code_dir()
+        context["data_dir"] = data_dir()
+        # XXX cjwatson 2019-02-11: data_mount_unit is only meaningful with
+        # layer:turnip-storage, but we include it here for simplicity.
+        context["data_mount_unit"] = data_mount_unit()
+        context["run_dir"] = run_dir()
+        context["venv_dir"] = venv_dir()
+        templating.render(
+            f"{service_name}.service.j2",
+            f"/lib/systemd/system/{service_name}.service",
+            context,
+            perms=0o644,
+        )
+        reload_systemd()
+        if host.service_running(service_name):
+            host.service_stop(service_name)
+        if not host.service_resume(service_name):
+            raise RuntimeError(f"Failed to start {service_name}")
+    port = config.get("port")
+    if port is not None:
+        hookenv.open_port(port)
+    configure_logrotate(config)
+
+
+def deconfigure_service(service_name):
+    host.service_pause(service_name)
+
+
+def add_nagios_e2e_checks(nagios):
+    config = hookenv.config()
+    src = os.path.join(hookenv.charm_dir(), "scripts", "nrpe")
+    dst = nrpe_dir()
+    if not os.path.exists(dst):
+        os.makedirs(dst)
+    shutil.copy2(
+        os.path.join(src, "check_git_refs"),
+        os.path.join(dst, "check_git_refs"),
+    )
+    nagios_logs_dir = "/var/log/nagios"
+    try:
+        if not os.path.exists(nagios_logs_dir):
+            host.mkdir(
+                nagios_logs_dir, owner="nagios", group="nagios", perms=0o755
+            )
+    except KeyError:
+        hookenv.log(f"nagios user not set up; {nagios_logs_dir} not created")
+    for i, url in enumerate(config["nagios_e2e_urls"].split()):
+        nagios.add_check(
+            [os.path.join(nrpe_dir(), "check_git_refs"), url],
+            name=f"check_turnip_git_refs_{i}",
+            description=(
+                "Git E2E {} - hint: check nfs-ganesha.service if all "
+                "appservers are bad, otherwise check "
+                "srv-turnip-data.mount"
+            ).format(url),
+            context=config["nagios_context"],
+        )
+
+
+def find_git_service(git_services, name):
+    for relation in git_services.relations:
+        for unit in relation.joined_units:
+            data = unit.received_raw
+            all_services = data.get("all_services")
+            if all_services is not None:
+                for service in yaml.safe_load(all_services):
+                    if service["service_name"] == name:
+                        return data["private-address"], service["service_port"]
+    return None, None
+
+
+def publish_website(website, name, port):
+    config = hookenv.config()
+    server_name = hookenv.local_unit().replace("/", "-")
+    server_ip = str(hookenv.unit_private_ip())
+    try:
+        service_options = yaml.safe_load(config.get("haproxy_service_options"))
+    except Exception:
+        status.blocked("bad haproxy_service_options YAML config")
+        return
+    server_options = config.get("haproxy_server_options")
+    haproxy_services = [
+        {
+            "service_name": name,
+            "service_host": "0.0.0.0",
+            "service_port": port,
+            "service_options": service_options,
+            "servers": [[server_name, server_ip, port, server_options]],
+        }
+    ]
+    haproxy_services_yaml = yaml.dump(haproxy_services)
+    for relation in website.relations:
+        ingress_address = website.get_ingress_address(relation.relation_id)
+        relation.to_publish_raw.update(
+            {
+                "hostname": ingress_address,
+                "private-address": ingress_address,
+                "port": str(port),
+                "services": haproxy_services_yaml,
+            }
+        )
+
+
+def get_rabbitmq_url():
+    """Get the RabbitMQ URL from relation data.
+
+    The relation data is only accessible from an amqp relation hook, so the
+    caller is expected to store the result for use by other hooks.
+    """
+    rabbitmq = endpoint_from_name("amqp")
+
+    if not rabbitmq.username() or not rabbitmq.password():
+        raise AssertionError(
+            "get_rabbitmq_url called when amqp relation data incomplete"
+        )
+
+    user = f"{rabbitmq.username()}:{rabbitmq.password()}"
+    vhost = rabbitmq.vhost() if rabbitmq.vhost() else "/"
+    return f"pyamqp://{user}@{rabbitmq.private_address()}/{vhost}"
diff --git a/turnip-base/metadata.yaml b/turnip-base/metadata.yaml
new file mode 100644
index 0000000..4913e81
--- /dev/null
+++ b/turnip-base/metadata.yaml
@@ -0,0 +1,5 @@
+resources:
+  turnip:
+    type: file
+    filename: turnip.tar.gz
+    description: Turnip code
diff --git a/turnip-base/reactive/turnip-base.py b/turnip-base/reactive/turnip-base.py
new file mode 100644
index 0000000..978d338
--- /dev/null
+++ b/turnip-base/reactive/turnip-base.py
@@ -0,0 +1,51 @@
+# Copyright 2018 Canonical Ltd.  This software is licensed under the
+# GNU Affero General Public License version 3 (see the file LICENSE).
+
+
+from charms.layer import status
+from charms.reactive import clear_flag, hook, set_flag, when, when_not
+from charms.turnip.base import (
+    PayloadError,
+    ensure_directories,
+    ensure_user,
+    group,
+    group_id,
+    install_services,
+    user,
+    user_id,
+)
+
+
+@when_not("turnip.created_user")
+def install():
+    ensure_user(user(), group(), uid=user_id(), gid=group_id())
+    ensure_directories()
+    set_flag("turnip.created_user")
+
+
+@when("turnip.created_user")
+@when_not("turnip.installed")
+def install_turnip():
+    try:
+        install_services()
+    except PayloadError as e:
+        status.blocked(str(e))
+        return
+    set_flag("turnip.installed")
+    clear_flag("turnip.configured")
+    status.maintenance("Service installed, but not configured")
+
+
+@hook("upgrade-charm")
+def upgrade_charm():
+    clear_flag("turnip.installed")
+
+
+@when("config.changed.build_label")
+def build_label_changed():
+    clear_flag("turnip.installed")
+
+
+@when("config.changed")
+def config_changed():
+    clear_flag("turnip.configured")
diff --git a/turnip-base/scripts/nrpe/check_git_refs b/turnip-base/scripts/nrpe/check_git_refs
new file mode 100755
index 0000000..d5322fb
--- /dev/null
+++ b/turnip-base/scripts/nrpe/check_git_refs
@@ -0,0 +1,24 @@
+#! /bin/sh
+set -u
+
+. /usr/lib/nagios/plugins/utils.sh
+
+LOGFILE=/var/log/nagios/check_git_refs.log
+
+if [ -z "$1" ]; then
+    echo "Usage: check_git_refs REPOSITORY_URL"
+    exit $STATE_UNKNOWN
+fi
+
+if ! BRANCHES="$(git ls-remote -h "$1" 2>$LOGFILE)"; then
+    echo "CRITICAL: Cannot list branches in $1"
+    exit $STATE_CRITICAL
+fi
+
+if ! echo "$BRANCHES" | grep -q '[[:space:]]refs/heads/'; then
+    echo "CRITICAL: $1 has no heads"
+    exit $STATE_CRITICAL
+fi
+
+echo "OK: Master branch found in $1"
+exit $STATE_OK
diff --git a/turnip-base/templates/turnip-rsync.j2 b/turnip-base/templates/turnip-rsync.j2
new file mode 100644
index 0000000..4ed2550
--- /dev/null
+++ b/turnip-base/templates/turnip-rsync.j2
@@ -0,0 +1,8 @@
+
+[turnip-logs]
+  path = {{ base_dir }}/logs
+  comment = Turnip Logs
+  list = false
+  read only = true
+  hosts allow = {{ log_hosts_allow }}
+
diff --git a/turnip-base/wheelhouse.txt b/turnip-base/wheelhouse.txt
new file mode 100644
index 0000000..3392d2e
--- /dev/null
+++ b/turnip-base/wheelhouse.txt
@@ -0,0 +1,2 @@
+PyYAML
+six
diff --git a/turnip-storage/config.yaml b/turnip-storage/config.yaml
new file mode 100644
index 0000000..2d2464a
--- /dev/null
+++ b/turnip-storage/config.yaml
@@ -0,0 +1,8 @@
+options:
+  nfs:
+    type: boolean
+    default: false
+    description: >
+      Use the NFS relation to provision repository storage.  A file
+      system will be requested and mounted at ${base_dir}/data.  The
+      service will not start until the file system is mounted.
diff --git a/turnip-storage/layer.yaml b/turnip-storage/layer.yaml
new file mode 100644
index 0000000..dd13414
--- /dev/null
+++ b/turnip-storage/layer.yaml
@@ -0,0 +1,4 @@
+includes:
+    - interface:mount
+    - layer:turnip-base
+repo: https://git.launchpad.net/turnip
diff --git a/turnip-storage/lib/charms/turnip/storage.py b/turnip-storage/lib/charms/turnip/storage.py
new file mode 100644
index 0000000..6b3505d
--- /dev/null
+++ b/turnip-storage/lib/charms/turnip/storage.py
@@ -0,0 +1,62 @@
+# Copyright 2018 Canonical Ltd.  This software is licensed under the
+# GNU Affero General Public License version 3 (see the file LICENSE).
+
+
+import os
+import subprocess
+
+from charmhelpers.core import host, templating
+from charms.turnip.base import (
+    data_dir,
+    data_mount_unit,
+    group_id,
+    reload_systemd,
+    user_id,
+)
+
+
+def ensure_mounted():
+    # If the service is stopped, start it. Make sure it is also unmasked to
+    # avoid blocking other services that depends on the data mount.
+    data_mount = data_mount_unit()
+    host.service("unmask", data_mount)
+    reload_systemd()
+    if not host.service_running(data_mount):
+        host.service_resume(data_mount)
+        subprocess.check_call(["mountpoint", "-q", data_dir()])
+
+
+def mount_data(mount_info):
+    # We use a systemd.mount(5) unit rather than a line in /etc/fstab partly
+    # because it's easier to deal with a file we can completely overwrite,
+    # and partly because this lets us automatically stop and start services
+    # that require the mount.
+    data_mount = data_mount_unit()
+    data_mount_conf = f"/lib/systemd/system/{data_mount}"
+    context = dict(mount_info)
+    context["data_dir"] = data_dir()
+    templating.render("data.mount.j2", data_mount_conf, context, perms=0o644)
+    host.service("unmask", data_mount)
+    reload_systemd()
+    host.service_restart(data_mount)
+    # systemctl shouldn't return successfully unless the mount completed,
+    # but let's make sure.
+    subprocess.check_call(["mountpoint", "-q", data_dir()])
+
+
+def unmount_data():
+    data_mount = data_mount_unit()
+    if host.service_running(data_mount):
+        host.service_stop(data_mount)
+    host.service("mask", data_mount)
+    reload_systemd()
+
+
+def ensure_repo_store_writable():
+    os.chown(data_dir(), user_id(), group_id())
+    os.chmod(data_dir(), 0o755)
+    repo_store = os.path.join(data_dir(), "repos")
+    if not os.path.exists(repo_store):
+        os.makedirs(repo_store)
+    os.chown(repo_store, user_id(), group_id())
+    os.chmod(repo_store, 0o755)
diff --git a/turnip-storage/lxd-profile.yaml b/turnip-storage/lxd-profile.yaml
new file mode 100644
index 0000000..52ba2e3
--- /dev/null
+++ b/turnip-storage/lxd-profile.yaml
@@ -0,0 +1,10 @@
+name: turnip-storage
+config:
+    raw.apparmor: |
+        mount fstype=nfs,
+        mount fstype=nfs4,
+        mount fstype=nfsd,
+        mount fstype=rpc_pipefs,
+    security.privileged: true
+description: "Allow NFS mounting for turnip storage"
+devices: {}
diff --git a/turnip-storage/metadata.yaml b/turnip-storage/metadata.yaml
new file mode 100644
index 0000000..7024acd
--- /dev/null
+++ b/turnip-storage/metadata.yaml
@@ -0,0 +1,4 @@
+requires:
+  nfs:
+    interface: mount
+    optional: true
diff --git a/turnip-storage/reactive/turnip-storage.py b/turnip-storage/reactive/turnip-storage.py
new file mode 100644
index 0000000..2c5bd4f
--- /dev/null
+++ b/turnip-storage/reactive/turnip-storage.py
@@ -0,0 +1,141 @@
+# Copyright 2018 Canonical Ltd.  This software is licensed under the
+# GNU Affero General Public License version 3 (see the file LICENSE).
+
+
+from charmhelpers.core import hookenv
+from charmhelpers.fetch import apt_install
+from charms.reactive import (
+    any_flags_set,
+    clear_flag,
+    data_changed,
+    endpoint_from_flag,
+    set_flag,
+    toggle_flag,
+    when,
+    when_any,
+    when_not,
+)
+from charms.turnip.base import data_dir
+from charms.turnip.storage import (
+    ensure_mounted,
+    ensure_repo_store_writable,
+    mount_data,
+    unmount_data,
+)
+
+
+def update_storage_available():
+    toggle_flag(
+        "turnip.storage.available",
+        any_flags_set("turnip.storage.internal", "turnip.storage.nfs"),
+    )
+
+
+@when("turnip.created_user")
+@when_not("turnip.storage.initialised")
+def initial_request():
+    if hookenv.config()["nfs"]:
+        apt_install("nfs-common", fatal=True)
+        clear_flag("turnip.storage.internal")
+    else:
+        ensure_repo_store_writable()
+        set_flag("turnip.storage.internal")
+    clear_flag("turnip.storage.nfs")
+    set_flag("turnip.storage.initialised")
+    update_storage_available()
+
+
+@when("nfs.joined")
+@when_not("turnip.storage.nfs-requested")
+def nfs_joined():
+    if not hookenv.config()["nfs"]:
+        return
+    nfs = endpoint_from_flag("nfs.joined")
+    nfs.set_export_name("turnip")
+    set_flag("turnip.storage.nfs-requested")
+
+
+@when("nfs.available")
+def nfs_available():
+    if not hookenv.config()["nfs"]:
+        return
+    nfs = endpoint_from_flag("nfs.available")
+    mount_info = None
+    for mount in nfs.mounts():
+        if mount["mount_name"] != "turnip":
+            continue
+        if mount["mounts"]:
+            mount_info = mount["mounts"][0]
+            # We only handle one related NFS unit.
+            break
+    # Unmount and/or mount storage as necessary.  Note that if we previously
+    # had valid mount information and now have different valid mount
+    # information then we need to do both operations.
+    if data_changed("turnip.storage.mount-info", mount_info):
+        unmount_data()
+        if mount_info is not None:
+            mount_data(mount_info)
+            ensure_repo_store_writable()
+        toggle_flag("turnip.storage.nfs", mount_info is not None)
+        update_storage_available()
+    # If mount-info didn't changed but is present, let's just make sure that
+    # the data storage is mounted.
+    elif mount_info is not None:
+        ensure_mounted()
+        ensure_repo_store_writable()
+        set_flag("turnip.storage.nfs")
+        update_storage_available()
+
+
+@when_any("turnip.storage.nfs-requested", "turnip.storage.nfs")
+@when_not("nfs.joined")
+def nfs_departed():
+    if data_changed("turnip.storage.mount-info", None):
+        unmount_data()
+    clear_flag("turnip.storage.nfs-requested")
+    clear_flag("turnip.storage.nfs")
+    update_storage_available()
+
+
+@when("config.changed.nfs")
+def nfs_config_changed():
+    clear_flag("turnip.storage.internal")
+    clear_flag("turnip.storage.nfs")
+    clear_flag("turnip.storage.initialised")
+    clear_flag("turnip.storage.nfs-requested")
+    update_storage_available()
+
+
+@when("nrpe-external-master.available", "turnip.configured")
+@when_not("turnip.storage.nrpe-external-master.published")
+def nrpe_available():
+    nagios = endpoint_from_flag("nrpe-external-master.available")
+    config = hookenv.config()
+    # XXX cjwatson 2018-12-11: We perhaps don't need this check on every
+    # unit that consumes the same storage; perhaps it could live on the
+    # storage backend instead.  However, this is easier to arrange for now.
+    nagios.add_check(
+        [
+            "/usr/lib/nagios/plugins/check_disk",
+            "-u",
+            "GB",
+            "-w",
+            "10%",
+            "-c",
+            "5%",
+            "-K",
+            "5%",
+            "-p",
+            data_dir(),
+        ],
+        name="check_disk_data",
+        description=f"Disk space on {data_dir()}",
+        context=config["nagios_context"],
+    )
+    set_flag("turnip.storage.nrpe-external-master.published")
+
+
+@when("turnip.storage.nrpe-external-master.published")
+@when_not("nrpe-external-master.available")
+def nrpe_unavailable():
+    clear_flag("turnip.storage.nrpe-external-master.published")
diff --git a/turnip-storage/templates/data.mount.j2 b/turnip-storage/templates/data.mount.j2
new file mode 100644
index 0000000..b115460
--- /dev/null
+++ b/turnip-storage/templates/data.mount.j2
@@ -0,0 +1,10 @@
+[Unit]
+Description=Turnip data file system
+
+[Mount]
+What={{ hostname }}:{{ mountpoint }}
+Where={{ data_dir }}
+Type={{ fstype }}
+Options={{ options }}
+LazyUnmount=true
+