add support for reading rightscale style userdata

LP: #668400

3 files changed, 84 insertions, 0 deletions

diff --git a/cloudinit/CloudConfig/cc_rightscale_userdata.py b/cloudinit/CloudConfig/cc_rightscale_userdata.py
new file mode 100644
index 00000000..bf1404e1
--- /dev/null
+++ b/cloudinit/CloudConfig/cc_rightscale_userdata.py
@@ -0,0 +1,73 @@
+# 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/>.
+
+##
+## The purpose of this script is to allow cloud-init to consume
+## rightscale style userdata.  rightscale user data is key-value pairs
+## in a url-query-string like format.
+##
+## for cloud-init support, there will be a key named
+## 'CLOUD_INIT_REMOTE_HOOK'.
+##
+## This cloud-config module will 
+## - read the blob of data from raw user data, and parse it as key/value
+## - for each key that is found, download the content to 
+##   the local instance/scripts directory and set them executable.
+## - the files in that directory will be run by the user-scripts module
+##   Therefore, this must run before that.
+##
+##
+import cloudinit.util as util
+from cloudinit.CloudConfig import per_once, per_always, per_instance
+from cloudinit import get_ipath_cur
+from urlparse import parse_qs
+
+frequency = per_once
+my_name = "cc_rightscale_userdata"
+my_hookname = 'CLOUD_INIT_REMOTE_HOOK'
+
+def handle(name,cfg,cloud,log,args):
+    try:
+        ud = cloud.get_userdata_raw()
+    except:
+        log.warn("failed to get raw userdata in %s" % my_name)
+        return
+
+    try:
+        mdict = parse_qs(cloud.get_userdata_raw())
+        if not my_hookname in mdict: return
+    except:
+        log.warn("failed to urlparse.parse_qa(userdata_raw())")
+        raise
+
+    scripts_d = get_ipath_cur('scripts')
+    i = 0
+    errors = [ ]
+    first_e = None
+    for url in mdict[my_hookname]:
+        fname = "%s/rightscale-%02i" % (scripts_d,i)
+        i = i +1
+        try:
+            content = util.readurl(url)
+            util.write_file(fname, content, mode=0700)
+        except Exception, e:
+            if not first_e: first_e = None
+            log.warn("%s failed to read %s: %s" % (my_name, url, e))
+            
+    if first_e:
+        raise(e)
diff --git a/cloudinit/util.py b/cloudinit/util.py
index 96e93af2..904fa1e1 100644
--- a/cloudinit/util.py
+++ b/cloudinit/util.py
@@ -323,3 +323,13 @@ def chownbyname(fname,user=None,group=None):
       gid = grp.getgrnam(group).gr_gid
 
    os.chown(fname,uid,gid)
+
+def readurl(url, data=None):
+   if data is None:
+      req = urllib2.Request(url)
+   else:
+      encoded = urllib.urlencode(values)
+      req = urllib2.Request(url, encoded)
+
+   response = urllib2.urlopen(req)
+   return(response.read())
diff --git a/config/cloud.cfg b/config/cloud.cfg
index c499969f..2aa574c7 100644
--- a/config/cloud.cfg
+++ b/config/cloud.cfg
@@ -22,6 +22,7 @@ cloud_config_modules:
  - byobu
 
 cloud_final_modules:
+ - rightscale_userdata
  - scripts-per-once
  - scripts-per-boot
  - scripts-per-instance