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, 25 insertions, 0 deletions

diff --git a/cloudinit/CloudConfig/cc_runcmd.py b/cloudinit/CloudConfig/cc_runcmd.py
new file mode 100644
index 00000000..fb5739da
--- /dev/null
+++ b/cloudinit/CloudConfig/cc_runcmd.py
@@ -0,0 +1,25 @@
+import cloudinit
+import cloudinit.util as util
+
+def handle(name,cfg,cloud,log,args):
+    if not cfg.has_key("runcmd"):
+        return
+    outfile="%s/runcmd" % cloudinit.user_scripts_dir
+
+    content="#!/bin/sh\n"
+    escaped="%s%s%s%s" % ( "'", '\\', "'", "'" )
+    try:
+        for args in cfg["runcmd"]:
+            # if the item is a list, wrap all items in single tick
+            # if its not, then just write it directly
+            if isinstance(args,list):
+                fixed = [ ]
+                for f in args:
+                    fixed.append("'%s'" % str(f).replace("'",escaped))
+                content="%s%s\n" % ( content, ' '.join(fixed) )
+            else:
+                content="%s%s\n" % ( content, str(args) )
+
+        util.write_file(outfile,content,0700)
+    except:
+        log.warn("failed to open %s for runcmd" % outfile)