Make gclient.git.revert reset to DEPS revision

BUG=http://crosbug.com/2897

Review URL: http://codereview.chromium.org/1742017

Change-Id: I1398a349f1af728b593f0d4ea877831f25aed1f4

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@46113 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -403,9 +403,16 @@ class GitWrapper(SCMWrapper):
       print("\n_____ %s is missing, synching instead" % self.relpath)
       # Don't reuse the args.
       return self.update(options, [], file_list)
-    merge_base = self._Run(['merge-base', 'HEAD', 'origin'])
-    files = self._Run(['diff', merge_base, '--name-only']).split()
-    self._Run(['reset', '--hard', merge_base], redirect_stdout=False)
+
+    default_rev = "refs/heads/master"
+    url, deps_revision = gclient_utils.SplitUrlRevision(self.url)
+    if not deps_revision:
+      deps_revision = default_rev
+    if deps_revision.startswith('refs/heads/'):
+      deps_revision = deps_revision.replace('refs/heads/', 'origin/')
+
+    files = self._Run(['diff', deps_revision, '--name-only']).split()
+    self._Run(['reset', '--hard', deps_revision], redirect_stdout=False)
     file_list.extend([os.path.join(self.checkout_path, f) for f in files])
 
   def revinfo(self, options, args, file_list):

tests/gclient_scm_test.py

@@ -527,10 +527,12 @@ from :3
       return
     options = self.Options()
     file_path = gclient_scm.os.path.join(self.base_path, 'a')
-    gclient_scm.os.remove(file_path)
     scm = gclient_scm.CreateSCM(url=self.url, root_dir=self.root_dir,
                                 relpath=self.relpath)
     file_list = []
+    scm.update(options, None, file_list)
+    gclient_scm.os.remove(file_path)
+    file_list = []
     scm.revert(options, self.args, file_list)
     self.assertEquals(file_list, [file_path])
     file_list = []
@@ -544,41 +546,47 @@ from :3
     scm = gclient_scm.CreateSCM(url=self.url, root_dir=self.root_dir,
                                 relpath=self.relpath)
     file_list = []
+    scm.update(options, None, file_list)
+    file_list = []
     scm.revert(options, self.args, file_list)
     self.assertEquals(file_list, [])
     self.assertEquals(scm.revinfo(options, self.args, None),
-                      '069c602044c5388d2d15c3f875b057c852003458')
+                      'a7142dc9f0009350b96a11f372b6ea658592aa95')
 
 
   def testRevertModified(self):
     if not self.enabled:
       return
     options = self.Options()
-    file_path = gclient_scm.os.path.join(self.base_path, 'a')
-    open(file_path, 'a').writelines('touched\n')
     scm = gclient_scm.CreateSCM(url=self.url, root_dir=self.root_dir,
                                 relpath=self.relpath)
     file_list = []
+    scm.update(options, None, file_list)
+    file_path = gclient_scm.os.path.join(self.base_path, 'a')
+    open(file_path, 'a').writelines('touched\n')
+    file_list = []
     scm.revert(options, self.args, file_list)
     self.assertEquals(file_list, [file_path])
     file_list = []
     scm.diff(options, self.args, file_list)
     self.assertEquals(file_list, [])
     self.assertEquals(scm.revinfo(options, self.args, None),
-                      '069c602044c5388d2d15c3f875b057c852003458')
+                      'a7142dc9f0009350b96a11f372b6ea658592aa95')
 
   def testRevertNew(self):
     if not self.enabled:
       return
     options = self.Options()
+    scm = gclient_scm.CreateSCM(url=self.url, root_dir=self.root_dir,
+                                relpath=self.relpath)
+    file_list = []
+    scm.update(options, None, file_list)
     file_path = gclient_scm.os.path.join(self.base_path, 'c')
     f = open(file_path, 'w')
     f.writelines('new\n')
     f.close()
     Popen(['git', 'add', 'c'], stdout=PIPE,
           stderr=STDOUT, cwd=self.base_path).communicate()
-    scm = gclient_scm.CreateSCM(url=self.url, root_dir=self.root_dir,
-                                relpath=self.relpath)
     file_list = []
     scm.revert(options, self.args, file_list)
     self.assertEquals(file_list, [file_path])
@@ -586,7 +594,7 @@ from :3
     scm.diff(options, self.args, file_list)
     self.assertEquals(file_list, [])
     self.assertEquals(scm.revinfo(options, self.args, None),
-                      '069c602044c5388d2d15c3f875b057c852003458')
+                      'a7142dc9f0009350b96a11f372b6ea658592aa95')
 
   def testStatusNew(self):
     if not self.enabled:

tests/scm_unittest.py

@@ -28,7 +28,7 @@ class RootTestCase(BaseSCMTestCase):
     members = [
         'GetCasedPath', 'GIT', 'SVN', 'ValidateEmail',
         'gclient_utils', 'glob', 'os', 're', 'shutil', 'subprocess', 'sys',
-        'tempfile', 'xml',
+        'tempfile', 'time', 'xml',
     ]
     # If this test fails, you should add the relevant test.
     self.compareMembers(scm, members)