commit d0609555e16dec9c9cbc4307187fa953ff30e12b
author Grace Cham <hscham@chromium.org> Mon Aug 28 04:35:13 2023
committer Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> Fri Sep 08 05:17:43 2023
tree f42df15645ab526122b006043e2eca859b141756
parent ed5d6037d7f2add4293715c80d7d384a67277e25

libchrome: apply_patches: tag HEAD-before-patching commit in apply mode

For resetting state to commit before applying patches in format mode
(to be implemented) which would format applied patches and rename them
back to the original patch name.

If the tag already exists, the script will try to determine if it is
from a related run (e.g. multiple runs with different --first, --last
arg on top of the same HEAD-before-patching commit) by checking whether
all commits since that commit is a patch commit (with a valid patch-name
trailer in its commit message).
If so, skip re-tagging; otherwise abort and remind user to either remove
the obsolete tag or fix the patch commit messages.

In addition, check that the patch commits since HEAD-before-patching are
applied in the same order as it does during `emerge libchrome`, and
abort if not.

BUG=b:293001194
TEST=python -m unittest test_apply_patches
TEST=sudo emerge libchrome
TEST=run script in libchrome repo

Change-Id: I19e731bc1b7fc3bbe0933171f0da270dfebe70c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/libchrome/+/4812608
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Tested-by: Grace Cham <hscham@chromium.org>
Commit-Queue: Grace Cham <hscham@chromium.org>