Print diff-index when tree is dirty

git_cl.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld."""
 
 import json
@@ skipping 981 matching lines @@
 def CMDpresubmit(parser, args):
   """run presubmit tests on the current changelist"""
   parser.add_option('--upload', action='store_true',
                     help='Run upload hook instead of the push/dcommit hook')
   parser.add_option('--force', action='store_true',
                     help='Run checks even if tree is dirty')
   (options, args) = parser.parse_args(args)
 
   # Make sure index is up-to-date before running diff-index.
   RunGit(['update-index', '--refresh', '-q'], error_ok=True)
-  if not options.force and RunGit(['diff-index', 'HEAD']):
+  diff_index = RunGit(['diff-index', 'HEAD'])
+  if not options.force and diff_index:
     # TODO(maruel): Is this really necessary?
-    print ('Cannot presubmit with a dirty tree.\n'
-          'You must commit locally first (or use --force).')
+    print >> sys.stderr, (
+        'Cannot presubmit with a dirty tree.\n'
+        'You must commit locally first (or use --force).\n'
+        'git diff-index HEAD\n%s' % diff_index[:4096])
     return 1
 
   cl = Changelist()
   if args:
     base_branch = args[0]
   else:
     # Default to diffing against the "upstream" branch.
     base_branch = cl.GetUpstreamBranch()
 
   cl.RunHook(committing=not options.upload, upstream_branch=base_branch,
@@ skipping 178 matching lines @@
   # Print warning if the user used the -m/--message argument.  This will soon
   # change to -t/--title.
   if options.message:
     print >> sys.stderr, (
         '\nWARNING: Use -t or --title to set the title of the patchset.\n'
         'In the near future, -m or --message will send a message instead.\n'
         'See http://goo.gl/JGg0Z for details.\n')
 
   # Make sure index is up-to-date before running diff-index.
   RunGit(['update-index', '--refresh', '-q'], error_ok=True)
-  if RunGit(['diff-index', 'HEAD']):
-    print 'Cannot upload with a dirty tree.  You must commit locally first.'
+  diff_index = RunGit(['diff-index', 'HEAD'])
+  if diff_index:
+    print >> sys.stderr, (
+        'Cannot upload with a dirty tree.  You must commit locally first.'
+        'git diff-index HEAD\n%s' % diff_index[:4096])
     return 1
 
   cl = Changelist()
   if args:
     # TODO(ukai): is it ok for gerrit case?
     base_branch = args[0]
   else:
     # Default to diffing against the "upstream" branch.
     base_branch = cl.GetUpstreamBranch()
     args = [base_branch + "..."]
@@ skipping 51 matching lines @@
   if options.contributor:
     if not re.match('^.*\s<\S+@\S+>$', options.contributor):
       print "Please provide contibutor as 'First Last <email@example.com>'"
       return 1
 
   base_branch = args[0]
   base_has_submodules = IsSubmoduleMergeCommit(base_branch)
 
   # Make sure index is up-to-date before running diff-index.
   RunGit(['update-index', '--refresh', '-q'], error_ok=True)
-  if RunGit(['diff-index', 'HEAD']):
-    print 'Cannot %s with a dirty tree.  You must commit locally first.' % cmd
+  diff_index = RunGit(['diff-index', 'HEAD'])
+  if diff_index:
+    print >> sys.stderr, (
+        'Cannot %s with a dirty tree.  You must commit locally first.'
+        'git diff-index HEAD\n%s' % (cmd, diff_index[:4096]))
     return 1
 
   # This rev-list syntax means "show all commits not in my branch that
   # are in base_branch".
   upstream_commits = RunGit(['rev-list', '^' + cl.GetBranchRef(),
                              base_branch]).splitlines()
   if upstream_commits:
     print ('Base branch "%s" has %d commits '
            'not in this branch.' % (base_branch, len(upstream_commits)))
     print 'Run "git merge %s" before attempting to %s.' % (base_branch, cmd)
@@ skipping 517 matching lines @@
              'and retry or visit go/isgaeup.\n%s') % (e.code, str(e)))
 
   # Not a known command. Default to help.
   GenUsage(parser, 'help')
   return CMDhelp(parser, argv)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   sys.exit(main(sys.argv[1:]))