Allow users of git cl to disable git copy detection entirely.

Depends on rietveld cl: https://codereview.appspot.com/6726050/
BUG=155511

Review URL: https://chromiumcodereview.appspot.com/11195012

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@163092 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -92,33 +92,55 @@ def ask_for_data(prompt):
     sys.exit(1)
 
 
+def git_set_branch_value(key, value):
+  branch = Changelist().GetBranch()
+  if branch:
+    git_key = 'branch.%s.%s' % (branch, key)
+    RunGit(['config', '--int', git_key, "%d" % value])
+
+
+def git_get_branch_default(key, default):
+  branch = Changelist().GetBranch()
+  if branch:
+    git_key = 'branch.%s.%s' % (branch, key)
+    (_, stdout) = RunGitWithCode(['config', '--int', '--get', git_key])
+    try:
+      return int(stdout.strip())
+    except ValueError:
+      pass
+  return default
+
+
 def add_git_similarity(parser):
   parser.add_option(
-      '--similarity', metavar='SIM', type='int', action='store', default=None,
+      '--similarity', metavar='SIM', type='int', action='store',
       help='Sets the percentage that a pair of files need to match in order to'
            ' be considered copies (default 50)')
+  parser.add_option(
+      '--find-copies', action='store_true',
+      help='Allows git to look for copies.')
+  parser.add_option(
+      '--no-find-copies', action='store_false', dest='find_copies',
+      help='Disallows git from looking for copies.')
 
   old_parser_args = parser.parse_args
   def Parse(args):
     options, args = old_parser_args(args)
 
-    branch = Changelist().GetBranch()
-    key = 'branch.%s.git-cl-similarity' % branch
     if options.similarity is None:
-      if branch:
-        (_, stdout) = RunGitWithCode(['config', '--int', '--get', key])
-        try:
-          options.similarity = int(stdout.strip())
-        except ValueError:
-          pass
-      options.similarity = options.similarity or 50
+      options.similarity = git_get_branch_default('git-cl-similarity', 50)
     else:
-      if branch:
-        print('Note: Saving similarity of %d%% in git config.'
-              % options.similarity)
-        RunGit(['config', '--int', key, str(options.similarity)])
+      print('Note: Saving similarity of %d%% in git config.'
+            % options.similarity)
+      git_set_branch_value('git-cl-similarity', options.similarity)
+
+    options.similarity = max(0, min(options.similarity, 100))
 
-    options.similarity = max(1, min(options.similarity, 100))
+    if options.find_copies is None:
+      options.find_copies = bool(
+          git_get_branch_default('git-find-copies', True))
+    else:
+      git_set_branch_value('git-find-copies', int(options.find_copies))
 
     print('Using %d%% similarity for rename/copy detection. '
           'Override with --similarity.' % options.similarity)
@@ -169,7 +191,7 @@ def MatchSvnGlob(url, base_url, glob_spec, allow_wildcards):
   return None
 
 
-def print_stats(similarity, args):
+def print_stats(similarity, find_copies, args):
   """Prints statistics about the change to the user."""
   # --no-ext-diff is broken in some versions of Git, so try to work around
   # this by overriding the environment (but there is still a problem if the
@@ -177,9 +199,16 @@ def print_stats(similarity, args):
   env = os.environ.copy()
   if 'GIT_EXTERNAL_DIFF' in env:
     del env['GIT_EXTERNAL_DIFF']
+
+  if find_copies:
+    similarity_options = ['--find-copies-harder', '-l100000',
+                          '-C%s' % similarity]
+  else:
+    similarity_options = ['-M%s' % similarity]
+
   return subprocess2.call(
-      ['git', 'diff', '--no-ext-diff', '--stat', '--find-copies-harder',
-       '-C%s' % similarity, '-l100000'] + args, env=env)
+      ['git', 'diff', '--no-ext-diff', '--stat'] + similarity_options + args,
+      env=env)
 
 
 class Settings(object):
@@ -1073,6 +1102,8 @@ def RietveldUpload(options, args, cl):
       upload_args.extend(['--cc', cc])
 
   upload_args.extend(['--git_similarity', str(options.similarity)])
+  if not options.find_copies:
+    upload_args.extend(['--git_no_find_copies'])
 
   # Include the upstream repo's URL in the change -- this is useful for
   # projects that have their source spread across multiple repos.
@@ -1176,7 +1207,7 @@ def CMDupload(parser, args):
     if not options.reviewers and hook_results.reviewers:
       options.reviewers = hook_results.reviewers
 
-  print_stats(options.similarity, args)
+  print_stats(options.similarity, options.find_copies, args)
   if settings.GetIsGerrit():
     return GerritUpload(options, args, cl)
   return RietveldUpload(options, args, cl)
@@ -1310,7 +1341,7 @@ def SendUpstream(parser, args, cmd):
 
   branches = [base_branch, cl.GetBranchRef()]
   if not options.force:
-    print_stats(options.similarity, branches)
+    print_stats(options.similarity, options.find_copies, branches)
     ask_for_data('About to commit; enter to confirm.')
 
   # We want to squash all this branch's commits into one commit with the proper

tests/git_cl_test.py

@@ -93,11 +93,12 @@ class TestGitCl(TestCase):
     return result
 
   @classmethod
-  def _upload_calls(cls, similarity):
-    return cls._git_base_calls(similarity) + cls._git_upload_calls()
+  def _upload_calls(cls, similarity, find_copies):
+    return (cls._git_base_calls(similarity, find_copies) +
+            cls._git_upload_calls())
 
   @staticmethod
-  def _git_base_calls(similarity):
+  def _git_base_calls(similarity, find_copies):
     if similarity is None:
       similarity = '50'
       similarity_call = ((['git', 'config', '--int', '--get',
@@ -105,11 +106,31 @@ class TestGitCl(TestCase):
     else:
       similarity_call = ((['git', 'config', '--int',
                          'branch.master.git-cl-similarity', similarity],), '')
+
+    if find_copies is None:
+      find_copies = True
+      find_copies_call = ((['git', 'config', '--int', '--get',
+                          'branch.master.git-find-copies'],), '')
+    else:
+      val = str(int(find_copies))
+      find_copies_call = ((['git', 'config', '--int',
+                          'branch.master.git-find-copies', val],), '')
+
+    if find_copies:
+      stat_call = ((['git', 'diff', '--no-ext-diff', '--stat',
+                   '--find-copies-harder', '-l100000', '-C'+similarity,
+                   'master...'],), '+dat')
+    else:
+      stat_call = ((['git', 'diff', '--no-ext-diff', '--stat',
+                   '-M'+similarity, 'master...'],), '+dat')
+
     return [
       ((['git', 'config', 'gerrit.host'],), ''),
       ((['git', 'config', 'rietveld.server'],), 'codereview.example.com'),
       ((['git', 'symbolic-ref', 'HEAD'],), 'master'),
       similarity_call,
+      ((['git', 'symbolic-ref', 'HEAD'],), 'master'),
+      find_copies_call,
       ((['git', 'update-index', '--refresh', '-q'],), ''),
       ((['git', 'diff-index', 'HEAD'],), ''),
       ((['git', 'symbolic-ref', 'HEAD'],), 'master'),
@@ -123,9 +144,7 @@ class TestGitCl(TestCase):
       ((['git', 'config', 'branch.master.rietveldpatchset'],), ''),
       ((['git', 'log', '--pretty=format:%s%n%n%b', 'master...'],), 'foo'),
       ((['git', 'config', 'user.email'],), 'me@example.com'),
-      ((['git', 'diff', '--no-ext-diff', '--stat', '--find-copies-harder',
-         '-C'+similarity, '-l100000', 'master...'],),
-       '+dat'),
+      stat_call,
       ((['git', 'log', '--pretty=format:%s\n\n%b', 'master..'],), 'desc\n'),
     ]
 
@@ -157,6 +176,9 @@ class TestGitCl(TestCase):
       ((['git', 'config', '--int', '--get',
         'branch.working.git-cl-similarity'],), ''),
       ((['git', 'symbolic-ref', 'HEAD'],), 'refs/heads/working'),
+      ((['git', 'config', '--int', '--get',
+        'branch.working.git-find-copies'],), ''),
+      ((['git', 'symbolic-ref', 'HEAD'],), 'refs/heads/working'),
       ((['git', 'config', 'branch.working.merge'],), 'refs/heads/master'),
       ((['git', 'config', 'branch.working.remote'],), 'origin'),
       ((['git', 'rev-list', '--merges',
@@ -205,7 +227,7 @@ class TestGitCl(TestCase):
   def _dcommit_calls_3(cls):
     return [
       ((['git', 'diff', '--no-ext-diff', '--stat', '--find-copies-harder',
-         '-C50', '-l100000', 'refs/remotes/origin/master',
+         '-l100000', '-C50', 'refs/remotes/origin/master',
          'refs/heads/working'],),
        (' PRESUBMIT.py |    2 +-\n'
         ' 1 files changed, 1 insertions(+), 1 deletions(-)\n')),
@@ -229,7 +251,7 @@ class TestGitCl(TestCase):
   ]
 
   @staticmethod
-  def _cmd_line(description, args, similarity):
+  def _cmd_line(description, args, similarity, find_copies):
     """Returns the upload command line passed to upload.RealMain()."""
     return [
         'upload', '--assume_yes', '--server',
@@ -237,7 +259,8 @@ class TestGitCl(TestCase):
         '--message', description
     ] + args + [
         '--cc', 'joe@example.com',
-        '--git_similarity', similarity or '50',
+        '--git_similarity', similarity or '50'
+    ] + (['--git_no_find_copies'] if find_copies == False else []) + [
         'master...'
     ]
 
@@ -253,7 +276,15 @@ class TestGitCl(TestCase):
       similarity = upload_args[upload_args.index('--similarity')+1]
     except ValueError:
       similarity = None
-    self.calls = self._upload_calls(similarity)
+
+    if '--find-copies' in upload_args:
+      find_copies = True
+    elif '--no-find-copies' in upload_args:
+      find_copies = False
+    else:
+      find_copies = None
+
+    self.calls = self._upload_calls(similarity, find_copies)
     def RunEditor(desc, _):
       self.assertEquals(
           '# Enter a description of the change.\n'
@@ -264,7 +295,8 @@ class TestGitCl(TestCase):
       return returned_description
     self.mock(git_cl.gclient_utils, 'RunEditor', RunEditor)
     def check_upload(args):
-      cmd_line = self._cmd_line(final_description, reviewers, similarity)
+      cmd_line = self._cmd_line(final_description, reviewers, similarity,
+                                find_copies)
       self.assertEquals(cmd_line, args)
       return 1, 2
     self.mock(git_cl.upload, 'RealMain', check_upload)
@@ -286,6 +318,14 @@ class TestGitCl(TestCase):
         'desc\n\nBUG=\n',
         [])
 
+  def test_keep_find_copies(self):
+    self._run_reviewer_test(
+        ['--no-find-copies'],
+        'desc\n\nBUG=\n',
+        '# Blah blah comment.\ndesc\n\nBUG=\n',
+        'desc\n\nBUG=\n',
+        [])
+
   def test_reviewers_cmd_line(self):
     # Reviewer is passed as-is
     description = 'desc\n\nR=foo@example.com\nBUG=\n'
@@ -337,7 +377,7 @@ class TestGitCl(TestCase):
 
     mock = FileMock()
     try:
-      self.calls = self._git_base_calls(None)
+      self.calls = self._git_base_calls(None, None)
       def RunEditor(desc, _):
         return desc
       self.mock(git_cl.gclient_utils, 'RunEditor', RunEditor)
@@ -371,6 +411,9 @@ class TestGitCl(TestCase):
         ((['git', 'symbolic-ref', 'HEAD'],), 'master'),
         ((['git', 'config', '--int', '--get',
           'branch.master.git-cl-similarity'],), ''),
+        ((['git', 'symbolic-ref', 'HEAD'],), 'master'),
+        ((['git', 'config', '--int', '--get',
+          'branch.master.git-find-copies'],), ''),
         ((['git', 'update-index', '--refresh', '-q'],), ''),
         ((['git', 'diff-index', 'HEAD'],), ''),
         ((['git', 'symbolic-ref', 'HEAD'],), 'master'),
@@ -385,7 +428,7 @@ class TestGitCl(TestCase):
         ((['git', 'log', '--pretty=format:%s%n%n%b', 'master...'],), 'foo'),
         ((['git', 'config', 'user.email'],), 'me@example.com'),
         ((['git', 'diff', '--no-ext-diff', '--stat', '--find-copies-harder',
-           '-C50', '-l100000', 'master...'],),
+           '-l100000', '-C50', 'master...'],),
          '+dat'),
         ]