git demo snap update - Bug 1595229

.bzrignore

@@ -15,4 +15,5 @@ dist
 htmlcov
 __pycache__
 docs/**.html
+*~
 *.swp

demos/git/README.md

@@ -0,0 +1,28 @@
+This example builds git trunk. It demonstrates the use of the 'home'
+plug to allow it access to the users home directory.
+
+After building and installing the snap, you will need to run the following
+command to grant it access to your home directory:
+
+```sh
+snap connect git:home ubuntu-core:home
+```
+
+Only access to the home directory is granted. You can see this containment
+in action by attempting to initialize a repository in /tmp:
+
+```sh
+$ mkdir -p /tmp/foo
+$ cd /tmp/foo
+$ /snap/bin/git init
+fatal: Could not change back to '/tmp/foo': No such file or directory
+```
+
+Initializing and using repositories in your home directory works fine:
+
+```sh
+$ mkdir -p $HOME/tmp/foo
+$ cd $HOME/tmp/foo
+$ /snap/bin/git init
+Initialized empty Git repository in /home/ubuntu/tmp/foo/.git/
+```

demos/git/snapcraft.yaml

@@ -5,8 +5,15 @@ description: This example is not really production quality
 confinement: strict
 
 apps:
-  server:
+  git:
     command: bin/git
+    # git will not have access to files outside of its containment
+    # until you run the following command after installing the snap:
+    #     snap connect git:home ubuntu-core:home
+    # After connecting up the home interface it gains access to
+    # non-hidden files in home directories.
+    plugs:
+      - home
 
 parts:
   git:

snaps_tests/demos_tests/test_git.py

@@ -0,0 +1,31 @@
+# -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*-
+#
+# Copyright (C) 2016 Canonical Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import snaps_tests
+
+
+class GitTestCase(snaps_tests.SnapsTestCase):
+
+    snap_content_dir = 'git'
+
+    def test_git(self):
+        self.build_snap(self.snap_content_dir)
+        self.install_snap(self.snap_content_dir, 'git', '0')
+        self.snappy_testbed.run_command(['sudo', 'snap', 'connect',
+                                         'git:home', 'ubuntu-core:home'])
+        self.assertTrue(
+            self.snappy_testbed.run_command(['/snap/bin/git',
+                                             '--version']).startswith('git'))