lxd: add support for setting up lxd using 'lxd init'

If lxd key is present in cfg, then run 'lxd init' with values from the 'init'
entry in lxd configuration as flags.

4 files changed, 114 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 0ba16492..9fbc920d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -71,6 +71,7 @@
  - Azure: get instance id from dmi instead of SharedConfig (LP: #1506187)
  - systemd/power_state: fix power_state to work even if cloud-final
    exited non-zero (LP: #1449318)
+ - lxd: add support for setting up lxd using 'lxd init'
 0.7.6:
  - open 0.7.6
  - Enable vendordata on CloudSigma datasource (LP: #1303986)
diff --git a/cloudinit/config/cc_lxd.py b/cloudinit/config/cc_lxd.py
new file mode 100644
index 00000000..0db8356b
--- /dev/null
+++ b/cloudinit/config/cc_lxd.py
@@ -0,0 +1,50 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2016 Canonical Ltd.
+#
+#    Author: Wesley Wiedenmeier <wesley.wiedenmeier@canonical.com>
+#
+#    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/>.
+
+"""
+This module initializes lxd using 'lxd init'
+
+Example config:
+  #cloud-config
+  lxd:
+    init:
+      network_address: <ip addr>
+      network_port: <port>
+      storage_backend: <zfs/dir>
+      storage_create_device: <dev>
+      storage_create_loop: <size>
+      storage_pool: <name>
+      trust_password: <password>
+"""
+
+from cloudinit import util
+
+
+def handle(name, cfg, cloud, log, args):
+    if not cfg.get('lxd') and cfg['lxd'].get('init'):
+        log.debug("Skipping module named %s, not present or disabled by cfg")
+        return
+    lxd_conf = cfg['lxd']['init']
+    keys = ('network_address', 'network_port', 'storage_backend',
+            'storage_create_device', 'storage_create_loop', 'storage_pool',
+            'trust_password')
+    cmd = ['lxd', 'init', '--auto']
+    for k in keys:
+        if lxd_conf.get(k):
+            cmd.extend(["--%s" % k.replace('_', '-'), lxd_conf[k]])
+    util.subp(cmd)
diff --git a/config/cloud.cfg b/config/cloud.cfg
index 74794ab0..795df19f 100644
--- a/config/cloud.cfg
+++ b/config/cloud.cfg
@@ -56,6 +56,7 @@ cloud_config_modules:
  - fan
  - landscape
  - timezone
+ - lxd
  - puppet
  - chef
  - salt-minion
diff --git a/tests/unittests/test_handler/test_handler_lxd.py b/tests/unittests/test_handler/test_handler_lxd.py
new file mode 100644
index 00000000..89863d52
--- /dev/null
+++ b/tests/unittests/test_handler/test_handler_lxd.py
@@ -0,0 +1,62 @@
+from cloudinit.config import cc_lxd
+from cloudinit import (util, distros, helpers, cloud)
+from cloudinit.sources import DataSourceNoCloud
+from .. import helpers as t_help
+
+import logging
+
+LOG = logging.getLogger(__name__)
+
+
+class TestLxd(t_help.TestCase):
+    def setUp(self):
+        super(TestLxd, self).setUp()
+        self.unapply = []
+        apply_patches([(util, 'subp', self._mock_subp)])
+        self.subp_called = []
+
+    def tearDown(self):
+        apply_patches([i for i in reversed(self.unapply)])
+
+    def _mock_subp(self, *args, **kwargs):
+        if 'args' not in kwargs:
+            kwargs['args'] = args[0]
+        self.subp_called.append(kwargs)
+        return
+
+    def _get_cloud(self, distro):
+        cls = distros.fetch(distro)
+        paths = helpers.Paths({})
+        d = cls(distro, {}, paths)
+        ds = DataSourceNoCloud.DataSourceNoCloud({}, d, paths)
+        cc = cloud.Cloud(ds, paths, {}, d, None)
+        return cc
+
+    def test_lxd_init(self):
+        cfg = {
+            'lxd': {
+                'init': {
+                    'network_address': '0.0.0.0',
+                    'storage_backend': 'zfs',
+                    'storage_pool': 'poolname',
+                }
+            }
+        }
+        cc = self._get_cloud('ubuntu')
+        cc_lxd.handle('cc_lxd', cfg, cc, LOG, [])
+
+        self.assertEqual(
+                self.subp_called[0].get('args'),
+                ['lxd', 'init', '--auto', '--network-address', '0.0.0.0',
+                 '--storage-backend', 'zfs', '--storage-pool', 'poolname'])
+
+
+def apply_patches(patches):
+    ret = []
+    for (ref, name, replace) in patches:
+        if replace is None:
+            continue
+        orig = getattr(ref, name)
+        setattr(ref, name, replace)
+        ret.append((ref, name, orig))
+    return ret