Fix cloud-init Python syntax for Python < 2.6

The loguserdata.py file gets uploaded to the servers created by Heat to run
under cloud-init. Since the default versions of Python installed on the
user's server may be very old (e.g. RHEL 5 defaults to Python 2.4), avoid
using the octal syntax introduced for Python 3.0 and backported only as far
as Python 2.6. (Also avoid the old syntax, which will break on Python 3.x.)

Also remove use of the "with" statement from loguserdata.py and
part-handler.py. This statement is only available from Python 2.6 on (or in
Python 2.5 via "from __future__ import with_statement").

Finally, remove use of the "except ExceptionType as value" syntax for
catching exceptions. Again, this was only backported to Python 2.6.

Change-Id: I89e86d00993d51e2514b1e589503c6d966909403
Partial-Bug: #1375864

heat/cloudinit/loguserdata.py

@@ -35,7 +35,7 @@ def init_logging():
     LOG.setLevel(logging.INFO)
     LOG.addHandler(logging.StreamHandler())
     fh = logging.FileHandler("/var/log/heat-provision.log")
-    os.chmod(fh.baseFilename, 0o600)
+    os.chmod(fh.baseFilename, int("600", 8))
     LOG.addHandler(fh)
 
 
@@ -55,14 +55,16 @@ def call(args):
         if data:
             for x in data:
                 ls.write(x)
-    except OSError as ex:
+    except OSError:
+        ex_type, ex, tb = sys.exc_info()
         if ex.errno == errno.ENOEXEC:
             LOG.error('Userdata empty or not executable: %s', ex)
             return os.EX_OK
         else:
             LOG.error('OS error running userdata: %s', ex)
             return os.EX_OSERR
-    except Exception as ex:
+    except Exception:
+        ex_type, ex, tb = sys.exc_info()
         LOG.error('Unknown error running userdata: %s', ex)
         return os.EX_SOFTWARE
     return p.returncode
@@ -77,7 +79,7 @@ def main():
         return -1
 
     userdata_path = os.path.join(VAR_PATH, 'cfn-userdata')
-    os.chmod(userdata_path, 0o700)
+    os.chmod(userdata_path, int("700", 8))
 
     LOG.info('Provision began: %s', datetime.datetime.now())
     returncode = call([userdata_path])
@@ -96,5 +98,8 @@ if __name__ == '__main__':
 
     provision_log = os.path.join(VAR_PATH, 'provision-finished')
     # touch the file so it is timestamped with when finished
-    with file(provision_log, 'a'):
+    pl = file(provision_log, 'a')
+    try:
         os.utime(provision_log, None)
+    finally:
+        pl.close()

heat/cloudinit/part_handler.py

@@ -15,6 +15,7 @@
 import datetime
 import errno
 import os
+import sys
 
 
 def list_types():
@@ -24,8 +25,9 @@ def list_types():
 def handle_part(data, ctype, filename, payload):
     if ctype == "__begin__":
         try:
-            os.makedirs('/var/lib/heat-cfntools', 0o700)
+            os.makedirs('/var/lib/heat-cfntools', int("700", 8))
-        except OSError as e:
+        except OSError:
+            ex_type, e, tb = sys.exc_info()
             if e.errno != errno.EEXIST:
                 raise
         return
@@ -33,14 +35,23 @@ def handle_part(data, ctype, filename, payload):
     if ctype == "__end__":
         return
 
-    with open('/var/log/part-handler.log', 'a') as log:
+    log = open('/var/log/part-handler.log', 'a')
+    try:
         timestamp = datetime.datetime.now()
         log.write('%s filename:%s, ctype:%s\n' % (timestamp, filename, ctype))
+    finally:
+        log.close()
 
     if ctype == 'text/x-cfninitdata':
-        with open('/var/lib/heat-cfntools/%s' % filename, 'w') as f:
+        f = open('/var/lib/heat-cfntools/%s' % filename, 'w')
+        try:
             f.write(payload)
+        finally:
+            f.close()
 
         # TODO(sdake) hopefully temporary until users move to heat-cfntools-1.3
-        with open('/var/lib/cloud/data/%s' % filename, 'w') as f:
+        f = open('/var/lib/cloud/data/%s' % filename, 'w')
+        try:
             f.write(payload)
+        finally:
+            f.close()