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.

1 files changed, 68 insertions, 0 deletions

diff --git a/cloudinit/config/cc_lxd.py b/cloudinit/config/cc_lxd.py
new file mode 100644
index 00000000..aaafb643
--- /dev/null
+++ b/cloudinit/config/cc_lxd.py
@@ -0,0 +1,68 @@
+# 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):
+    # Get config
+    lxd_cfg = cfg.get('lxd')
+    if not lxd_cfg and isinstance(lxd_cfg, dict):
+        log.debug("Skipping module named %s, not present or disabled by cfg")
+        return
+
+    # Ensure lxd is installed
+    if not util.which("lxd"):
+        try:
+            cloud.distro.install_packages(("lxd",))
+        except util.ProcessExecutionError as e:
+            log.warn("no lxd executable and could not install lxd:", e)
+            return
+
+    # Set up lxd if init config is given
+    init_keys = (
+        'network_address', 'network_port', 'storage_backend',
+        'storage_create_device', 'storage_create_loop',
+        'storage_pool', 'trust_password')
+    init_cfg = lxd_cfg.get('init')
+    if init_cfg:
+        if not isinstance(init_cfg, dict):
+            log.warn("lxd/init config must be a dictionary. found a '%s'",
+                      type(f))
+            return
+        cmd = ['lxd', 'init', '--auto']
+        for k in init_keys:
+            if init_cfg.get(k):
+                cmd.extend(["--%s" % k.replace('_', '-'), init_cfg[k]])
+        util.subp(cmd)