loguserdata: prevent shadowing of arguments and globals

cleaning this up for bug 1154641

Change-Id: I95271bdeba1bba29e78af79de4e2173d07750e4f
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>

diff --git a/heat/cloudinit/loguserdata.py b/heat/cloudinit/loguserdata.py
index 22eb2fece6ea23148bf1ab016318c9227733d743..7e66166f72bd64cef50bd63616bc8b3650ff8858 100644 (file)
--- a/heat/cloudinit/loguserdata.py
+++ b/heat/cloudinit/loguserdata.py
@@ -1,13 +1,15 @@
 #!/usr/bin/env python
 
-import sys
-import os
-import subprocess
 import datetime
 import pkg_resources
+import os
+import subprocess
+import sys
+
 from distutils.version import LooseVersion
 
-path = '/var/lib/heat-cfntools'
+
+VAR_PATH = '/var/lib/heat-cfntools'
 
 
 def chk_ci_version():
@@ -15,45 +17,45 @@ def chk_ci_version():
     return v >= LooseVersion('0.6.0')
 
 
-def create_log(path):
-    fd = os.open(path, os.O_WRONLY | os.O_CREAT, 0600)
+def create_log(log_path):
+    fd = os.open(log_path, os.O_WRONLY | os.O_CREAT, 0600)
     return os.fdopen(fd, 'w')
 
 
-def call(args, log):
-    log.write('%s\n' % ' '.join(args))
-    log.flush()
-    p = subprocess.Popen(args, stdout=log, stderr=log)
+def call(args, logger):
+    logger.write('%s\n' % ' '.join(args))
+    logger.flush()
+    p = subprocess.Popen(args, stdout=logger, stderr=logger)
     p.wait()
     return p.returncode
 
 
-def main(log):
+def main(logger):
 
     if not chk_ci_version():
         # pre 0.6.0 - user data executed via cloudinit, not this helper
-        log.write('Unable to log provisioning, need a newer version of'
-                  ' cloud-init\n')
+        logger.write('Unable to log provisioning, need a newer version of'
+                     ' cloud-init\n')
         return -1
 
-    userdata_path = os.path.join(path, 'cfn-userdata')
+    userdata_path = os.path.join(VAR_PATH, 'cfn-userdata')
     os.chmod(userdata_path, 0700)
 
-    log.write('Provision began: %s\n' % datetime.datetime.now())
-    log.flush()
-    returncode = call([userdata_path], log)
-    log.write('Provision done: %s\n' % datetime.datetime.now())
+    logger.write('Provision began: %s\n' % datetime.datetime.now())
+    logger.flush()
+    returncode = call([userdata_path], logger)
+    logger.write('Provision done: %s\n' % datetime.datetime.now())
     if returncode:
         return returncode
 
 
 if __name__ == '__main__':
     with create_log('/var/log/heat-provision.log') as log:
-        returncode = main(log)
-        if returncode:
+        code = main(log)
+        if code:
             log.write('Provision failed')
-            sys.exit(returncode)
+            sys.exit(code)
 
-    userdata_path = os.path.join(path, 'provision-finished')
-    with create_log(userdata_path) as log:
+    provision_log = os.path.join(VAR_PATH, 'provision-finished')
+    with create_log(provision_log) as log:
         log.write('%s\n' % datetime.datetime.now())