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, 32 insertions, 0 deletions

diff --git a/cloudinit/CloudConfig/cc_updates_check.py b/cloudinit/CloudConfig/cc_updates_check.py
new file mode 100644
index 00000000..b24b8c61
--- /dev/null
+++ b/cloudinit/CloudConfig/cc_updates_check.py
@@ -0,0 +1,32 @@
+import cloudinit.util as util
+import cloudinit
+import os
+import time
+
+cronpre = "/etc/cron.d/cloudinit"
+
+def handle(name,cfg,cloud,log,args):
+    if not util.get_cfg_option_bool(cfg, 'updates-check', True):
+        return
+    build_info = "/etc/cloud/build.info"
+    if not os.path.isfile(build_info):
+        log.warn("no %s file" % build_info)
+
+    avail="%s/%s" % ( cloudinit.datadir, "available.build" )
+    cmd=( "uec-query-builds", "--system-suite", "--config", "%s" % build_info,
+          "--output", "%s" % avail, "is-update-available" )
+    try:
+        util.subp(cmd)
+    except:
+        log.warn("failed to execute uec-query-build for updates check")
+
+    # add a cron entry for this hour and this minute every day
+    try:
+        cron=open("%s-%s" % (cronpre, "updates") ,"w")
+        cron.write("%s root %s\n" % \
+            (time.strftime("%M %H * * *"),' '.join(cmd)))
+        cron.close()
+    except:
+        log.warn("failed to enable cron update system check")
+        raise
+