add timezone to cloud-config (LP: #645458)

ChangeLog

@@ -35,3 +35,4 @@
    system config. changen "cloud_type: auto" as configuration for this
    to 'datasource_list: [ "Ec2" ]'.  Each of the items in that list
    must be modules that can be loaded by "DataSource<item>"
+ - add 'timezone' option to cloud-config (LP: #645458)

cloudinit/CloudConfig/cc_timezone.py

@@ -0,0 +1,57 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2009-2010 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/>.
+from cloudinit.CloudConfig import per_instance
+from cloudinit import util
+import subprocess
+import os.path
+import shutil
+
+frequency = per_instance
+tz_base = "/usr/share/zoneinfo"
+
+def handle(name,cfg,cloud,log,args):
+    print args
+    if len(args) != 0:
+        timezone = args[0]
+    else:
+        timezone = util.get_cfg_option_str(cfg,"timezone",False)
+
+    if not timezone: return
+
+    tz_file = "%s/%s" % (tz_base , timezone)
+
+    if not os.path.isfile(tz_file):
+        log.debug("Invalid timezone %s" % tz_file)
+        raise Exception("Invalid timezone %s" % tz_file)
+
+    try:
+        fp=open("/etc/timezone","wb")
+        fp.write("%s\n" % timezone)
+        fp.close()
+    except:
+        log.debug("failed to write to /etc/timezone")
+        raise
+
+    try:
+        shutil.copy(tz_file, "/etc/localtime")
+    except:
+        log.debug("failed to copy %s to /etc/localtime" % tz_file)
+        raise
+        
+    log.debug("set timezone to %s" % timezone)
+    return

doc/examples/cloud-config.txt

@@ -324,3 +324,7 @@ output:
 phone_home:
  url: http://my.example.com/$INSTANCE_ID/
  post: [ pub_key_dsa, pub_key_rsa, instance_id ]
+
+# timezone: set the timezone for this instance
+# the value of 'timezone' must exist in /usr/share/zoneinfo
+timezone: US/Eastern