Add git thaw/freeze to depot_tools.

tests/git_freezer_test.py

+#!/usr/bin/env python
+# Copyright 2013 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.
+
+"""Unit tests for git_freezer.py"""
+
+import os
+import sys
+
+DEPOT_TOOLS_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, DEPOT_TOOLS_ROOT)
+
+from testing_support import coverage_utils
+from testing_support import git_test_utils
+
+
+class GitFreezeThaw(git_test_utils.GitRepoReadWriteTestBase):
+  @classmethod
+  def setUpClass(cls):
+    super(GitFreezeThaw, cls).setUpClass()
+    import git_freezer
+    cls.gf = git_freezer
+
+  REPO = """
+  A B C D
+    B E D
+  """
+
+  COMMIT_A = {
+    'some/files/file1': {'data': 'file1'},
+    'some/files/file2': {'data': 'file2'},
+    'some/files/file3': {'data': 'file3'},
+    'some/other/file':  {'data': 'otherfile'},
+  }
+
+  COMMIT_C = {
+    'some/files/file2': {
+      'mode': 0755,
+      'data': 'file2 - vanilla'},
+  }
+
+  COMMIT_E = {
+    'some/files/file2': {'data': 'file2 - merged'},
+  }
+
+  COMMIT_D = {
+    'some/files/file2': {'data': 'file2 - vanilla\nfile2 - merged'},
+  }
+
+  def testNothing(self):
+    self.assertIsNotNone(self.repo.run(self.gf.thaw))  # 'Nothing to thaw'
+    self.assertIsNotNone(self.repo.run(self.gf.freeze))  # 'Nothing to freeze'
+
+  def testAll(self):
+    def inner():
+      with open('some/files/file2', 'a') as f2:
+        print >> f2, 'cool appended line'
+      os.mkdir('some/other_files')
+      with open('some/other_files/subdir_file', 'w') as f3:
+        print >> f3, 'new file!'
+      with open('some/files/file5', 'w') as f5:
+        print >> f5, 'New file!1!one!'
+
+      STATUS_1 = '\n'.join((
+        ' M some/files/file2',
+        'A  some/files/file5',
+        '?? some/other_files/'
+      )) + '\n'
+
+      self.repo.git('add', 'some/files/file5')
+
+      # Freeze group 1
+      self.assertEquals(self.repo.git('status', '--porcelain').stdout, STATUS_1)
+      self.assertIsNone(self.gf.freeze())
+      self.assertEquals(self.repo.git('status', '--porcelain').stdout, '')
+
+      # Freeze group 2
+      with open('some/files/file2', 'a') as f2:
+        print >> f2, 'new! appended line!'
+      self.assertEquals(self.repo.git('status', '--porcelain').stdout,
+                        ' M some/files/file2\n')
+      self.assertIsNone(self.gf.freeze())
+      self.assertEquals(self.repo.git('status', '--porcelain').stdout, '')
+
+      # Thaw it out!
+      self.assertIsNone(self.gf.thaw())
+      self.assertIsNotNone(self.gf.thaw())  # One thaw should thaw everything
+
+      self.assertEquals(self.repo.git('status', '--porcelain').stdout, STATUS_1)
+
+    self.repo.run(inner)
+
+
+
+if __name__ == '__main__':
+  sys.exit(coverage_utils.covered_main(
+    os.path.join(DEPOT_TOOLS_ROOT, 'git_freezer.py')
+  ))