pygrub: add debug flag

Debugging config file errors is tedious so help a bit by not silently
dropping parsing exceptions when --debug is given. Also intialize the
logging API at debug level in this case.

Signed-off-by: Guido Gunther <agx@sigxcpu.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/pygrub/src/pygrub

@@ -13,7 +13,7 @@
 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #
 
-import os, sys, string, struct, tempfile, re
+import os, sys, string, struct, tempfile, re, traceback
 import copy
 import logging
 import platform
@@ -665,7 +665,7 @@ if __name__ == "__main__":
                                    ["quiet", "interactive", "not-really", "help", 
                                     "output=", "output-format=", "output-directory=",
                                     "entry=", "kernel=", 
-                                    "ramdisk=", "args=", "isconfig"])
+                                    "ramdisk=", "args=", "isconfig", "debug"])
     except getopt.GetoptError:
         usage()
         sys.exit(1)
@@ -679,6 +679,7 @@ if __name__ == "__main__":
     entry = None
     interactive = True
     isconfig = False
+    debug = False
     not_really = False
     output_format = "sxp"
     output_directory = "/var/run/xend/boot"
@@ -714,6 +715,8 @@ if __name__ == "__main__":
             interactive = False
         elif o in ("--isconfig",):
             isconfig = True
+        elif o in ("--debug",):
+            debug = True
         elif o in ("--output-format",):
             if a not in ["sxp", "simple", "simple0"]:
                 print "unkonwn output format %s" % a
@@ -723,6 +726,9 @@ if __name__ == "__main__":
         elif o in ("--output-directory",):
             output_directory = a
 
+    if debug:
+	logging.basicConfig(level=logging.DEBUG)
+
     if output is None or output == "-":
         fd = sys.stdout.fileno()
     else:
@@ -769,6 +775,8 @@ if __name__ == "__main__":
         except:
             # IOErrors raised by fsimage.open
             # RuntimeErrors raised by run_grub if no menu.lst present
+            if debug:
+		traceback.print_exc()
             fs = None
             continue