add debug output to ccfg-merge-debug

Exeptions were being swallowed completely and no way to even see them
other than log.

cloudinit/log.py

@@ -44,13 +44,13 @@ NOTSET = logging.NOTSET
 DEF_CON_FORMAT = '%(asctime)s - %(filename)s[%(levelname)s]: %(message)s'
 
 
-def setupBasicLogging():
+def setupBasicLogging(level=DEBUG):
     root = logging.getLogger()
     console = logging.StreamHandler(sys.stderr)
     console.setFormatter(logging.Formatter(DEF_CON_FORMAT))
-    console.setLevel(DEBUG)
+    console.setLevel(level)
     root.addHandler(console)
-    root.setLevel(DEBUG)
+    root.setLevel(level)
 
 
 def flushLoggers(root):

tools/ccfg-merge-debug

@@ -3,6 +3,7 @@
 from cloudinit import handlers
 from cloudinit.handlers import cloud_config as cc_part
 from cloudinit import helpers
+from cloudinit import log as logging
 from cloudinit.settings import PER_INSTANCE
 from cloudinit import user_data as ud
 
@@ -17,9 +18,16 @@ def main():
         description='test cloud-config merging')
     parser.add_argument("--output", "-o", metavar="file",
         help="specify output file", default="-")
+    parser.add_argument('--verbose', '-v', action='count', default=0)
     parser.add_argument('files', nargs='+')
 
     args = parser.parse_args()
+
+    if args.verbose:
+        level = (logging.WARN, logging.INFO,
+                 logging.DEBUG)[min(args.verbose, 2)]
+        logging.setupBasicLogging(level)
+
     outfile = args.output
     if args.output == "-":
         outfile = "/dev/stdout"