Add git thaw/freeze to depot_tools.

git_freezer.py

Index: git_freezer.py
diff --git a/git_freezer.py b/git_freezer.py
new file mode 100755
index 0000000000000000000000000000000000000000..314a7d05d27346c7d0009ab20620e40ad30986a4
--- /dev/null
+++ b/git_freezer.py
@@ -0,0 +1,56 @@
+#!/usr/local/bin/python
+import sys
+import re
+import optparse
+
+import subcommand
+
+from git_common import run, stream
+
+FREEZE = 'FREEZE'
+SECTIONS = {
+  'indexed': 'soft',
+  'unindexed': 'mixed'
+}
+MATCHER = re.compile(r'%s.(%s)' % (FREEZE, '|'.join(SECTIONS)))
+
+
+def CMDfreeze(_parser, _args):
+  """freeze a branches changes."""

[agable, 2014/02/28 19:35:35]

possessive

+  took_action = False
+  status = [(line[:2], line[2:]) for line in run('status', '-z').split('\0')]
+  if status[-1] == ('', ''):
+    status.pop()
+  if any(mode[0] != ' ' for mode, _ in status):
+    run('commit', '-m', FREEZE + '.' + 'indexed')

[agable, 2014/02/28 19:35:35]

+ '.indexed'?

+    took_action = True
+  if any(mode[0] in ' ?' for mode, _ in status):
+    run('add', '-A')
+    run('commit', '-m', FREEZE + '.' + 'unindexed')
+    took_action = True
+
+  if not took_action:
+    print 'Nothing to freeze.'
+
+
+def CMDthaw(_parser, _args):
+  """returns a frozen branch to the state before it was frozen."""
+  took_action = False
+  for sha in (s.strip() for s in stream('rev-list', 'HEAD').xreadlines()):
+    msg = run('show', '--format=%f%b', '-s', 'HEAD')
+    match = MATCHER.match(msg)
+    if not match:
+      if not took_action:
+        print 'Nothing to thaw.'
+      break
+
+    run('reset', '--' + SECTIONS[match.group(1)], sha)
+    took_action = True
+
+
+def main():
+  dispatcher = subcommand.CommandDispatcher(__name__)
+  return dispatcher.execute(optparse.OptionParser(), sys.argv[1:])
+
+if __name__ == '__main__':
+  sys.exit(main())