Optimize presubmit --all with --no_diffs option
Some of the expensive checks when running presubmit --all, such as
CheckStableMojomChanges (~300 s) and CheckAddedDepsHaveTargetApprovals
(~200 s) only look at diffs and are therefore guaranteed to be NOPs when
running presubmit --all or --files=. Passing along the no_diffs state
lets these expensive checks be skipped, thus allowing for faster
iteration times.
Initial testing suggests that (with some supporting changes in the
Chromium repo) this reduces "presubmit --all" times by about ten
minutes, or a bit more than 10%, and additional improvements may be
possible.
Special handling for the no-diffs case also offers a simple way to avoid
presubmit failures that happen whenever all files are flagged as being
changed.
Finally, and perhaps most importantly for having a presubmit --all bot,
when --no_diffs is passed we can treat errors like "Issue wasn't
uploaded" and "Add a description to the CL" as messages, thus making it
possible to have zero presubmit errors when run on origin/main.
Bug: 1320937, 1322936
Change-Id: I0d09dd4aae8fdaa48c8b2f89337441cf96dcff72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3628368
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Gavin Mak <gavinmak@google.com>
diff --git a/git_cl.py b/git_cl.py
index eebf734..806dad2 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -1362,6 +1362,8 @@
if files:
args.extend(files.split(';'))
args.append('--source_controlled_only')
+ if files or all_files:
+ args.append('--no_diffs')
if resultdb and not realm:
# TODO (crbug.com/1113463): store realm somewhere and look it up so