Revert "Replace part_handler.py with write-files cloudinit mechanism"

Ubuntu has 0.6 of cloudinit, and write-files doesn't work on that
distro.  Ubuntu does not intend to update cloudinit in their LTS release
to 0.7.

This reverts commit 621f5bfdba.
Fixes: Bug #1207088

Change-Id: If80863883afee28bdde6dd506826ec5710cc0308

heat/cloudinit/boothook.sh

@@ -2,7 +2,6 @@
 setenforce 0
 useradd -m @INSTANCE_USER@
 echo -e '@INSTANCE_USER@\tALL=(ALL)\tNOPASSWD: ALL' >> /etc/sudoers
-mkdir /var/lib/heat-cfntools
 
 # Do not remove - the cloud boothook should always return success
 exit 0

heat/cloudinit/config

@@ -1,4 +1,3 @@
-#cloud-config
 user: @INSTANCE_USER@
 
 cloud_config_modules:
@@ -7,7 +6,6 @@ cloud_config_modules:
  - timezone
  - update_etc_hosts
  - update_hostname
- - write-files
 
 # Capture all subprocess output into a logfile
 # Useful for troubleshooting cloud-init issues

heat/cloudinit/loguserdata.py

@@ -78,6 +78,7 @@ def main():
         return -1
 
     userdata_path = os.path.join(VAR_PATH, 'cfn-userdata')
+    os.chmod(userdata_path, 0o700)
 
     LOG.info('Provision began: %s\n' % datetime.datetime.now())
     returncode = call([userdata_path])

heat/cloudinit/part_handler.py

@@ -0,0 +1,46 @@
+#part-handler
+
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import datetime
+import errno
+import os
+
+
+def list_types():
+    return(["text/x-cfninitdata"])
+
+
+def handle_part(data, ctype, filename, payload):
+    if ctype == "__begin__":
+        try:
+            os.makedirs('/var/lib/heat-cfntools', 0o700)
+        except OSError as e:
+            if e.errno != errno.EEXIST:
+                raise
+        return
+
+    if ctype == "__end__":
+        return
+
+    with open('/var/log/part-handler.log', 'a') as log:
+        timestamp = datetime.datetime.now()
+        log.write('%s filename:%s, ctype:%s\n' % (timestamp, filename, ctype))
+
+    if ctype == 'text/x-cfninitdata':
+        with open('/var/lib/heat-cfntools/%s' % filename, 'w') as f:
+            f.write(payload)
+
+        # TODO(sdake) hopefully temporary until users move to heat-cfntools-1.3
+        with open('/var/lib/cloud/data/%s' % filename, 'w') as f:
+            f.write(payload)