make cloud-config modules configurable by cloud-config

The list of cloud-config modules is now kept in cloud config itself.
There is a builtin list in cloudinit, which is overrideable by 
 /etc/cloud/cloud.cfg or user data cloud-config.

This should make the modules more easily added or removed (as no code
needs to be edited now)

Basic summary of changes:
 - move CloudConfig.py -> cloudinit/CloudConfig/__init__.py
 - split cloud-config modules into their own files named
   cloudinit/CloudConfig/cc_<name>.py
 - remove all the upstart/cloud-config-* scripts, replacing them with
   upstart/cloud-config.conf

1 files changed, 57 insertions, 0 deletions

diff --git a/cloudinit/CloudConfig/__init__.py b/cloudinit/CloudConfig/__init__.py
new file mode 100644
index 00000000..600b21ab
--- /dev/null
+++ b/cloudinit/CloudConfig/__init__.py
@@ -0,0 +1,57 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2008-2010 Canonical Ltd.
+#
+#    Author: Chuck Short <chuck.short@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 yaml
+import cloudinit
+import cloudinit.util as util
+import sys
+
+per_instance="once-per-instance"
+per_always="always"
+
+class CloudConfig():
+    cfgfile = None
+    cfg = None
+
+    def __init__(self,cfgfile):
+        self.cloud = cloudinit.CloudInit()
+        self.cfg = self.get_config_obj(cfgfile)
+        self.cloud.get_data_source()
+
+    def get_config_obj(self,cfgfile):
+        f=file(cfgfile)
+        cfg=yaml.load(f.read())
+        f.close()
+        if cfg is None: cfg = { }
+        return(util.mergedict(cfg,self.cloud.cfg))
+
+    def handle(self, name, args, freq=None):
+        try:
+            mod = __import__("cc_" + name.replace("-","_"),globals())
+            def_freq = getattr(mod, "frequency",per_instance)
+            handler = getattr(mod, "handle")
+
+            if not freq:
+                freq = def_freq
+
+            self.cloud.sem_and_run(name, freq, handler, 
+                [ name, self.cfg, self.cloud, cloudinit.log, args ])
+        except:
+            cloudinit.log.error(traceback.format_exc())
+            raise
+