update /etc/hosts hosts.tmpl to if 'manage_etc_hosts' is set in cloud-config

LP: #720440

1 files changed, 41 insertions, 0 deletions

diff --git a/cloudinit/CloudConfig/cc_update_etc_hosts.py b/cloudinit/CloudConfig/cc_update_etc_hosts.py
new file mode 100644
index 00000000..856cbae1
--- /dev/null
+++ b/cloudinit/CloudConfig/cc_update_etc_hosts.py
@@ -0,0 +1,41 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2011 Canonical Ltd.
+#
+#    Author: Scott Moser <scott.moser@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/>.
+import cloudinit.util as util
+from cloudinit.CloudConfig import per_always
+
+frequency = per_always
+
+def handle(name,cfg,cloud,log,args):
+    if not util.get_cfg_option_bool(cfg,"manage_etc_hosts",False):
+        log.debug("manage_etc_hosts is not set. not modifying /etc/hosts")
+        return
+
+    try:
+        hostname = util.get_cfg_option_str(cfg,"hostname",cloud.get_hostname())
+        if not hostname:
+            hostname = cloud.get_hostname()
+
+        if not hostname:
+            log.info("manage_etc_hosts was set, but no hostname found")
+            return
+
+        util.render_to_file('hosts', '/etc/hosts', { 'hostname' : hostname })
+
+    except Exception as e:
+        log.warn("failed to update /etc/hosts")
+        raise