Speed up git thaw
Previously, git thaw would read the whole output of git rev-list HEAD
via readlines(). This was unnecessary, because we almost always only
need to look a few of the most recent commits. Most of the runtime of git-thaw was spend on this.
After this commit, we only read the lines we actually need. This makes git thaw run much faster.
Bug: 1378479
Change-Id: I6f6c06e1df55b4943a94642aa414fc11aeea5718
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3981233
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Martin Bidlingmaier <mbid@google.com>
diff --git a/git_common.py b/git_common.py
index 3fea740..86a571e 100644
--- a/git_common.py
+++ b/git_common.py
@@ -922,7 +922,7 @@
def thaw():
took_action = False
- for sha in run_stream('rev-list', 'HEAD').readlines():
+ for sha in run_stream('rev-list', 'HEAD'):
sha = sha.strip().decode('utf-8')
msg = run('show', '--format=%f%b', '-s', 'HEAD')
match = FREEZE_MATCHER.match(msg)