`git cl split` claims to have built-in auto-resume capabilities, but
the nondeterminism in its splitting algorithm means they don't work
in practice. Now that we have the ability to load splittings from
files, we can ensure the user is using the same splitting as before,
and resume safely.
This CL does two things:
- It checks that any existing split branches match the splitting we're
about to upload, and complains if they don't match. This relies on
the fact that our branch names are unique and deterministic.
- It changes the auto-resume message to mention that --from-file is
required, and includes the relevant filename. This requires tracking
that filename from earlier in the program.
Bug: 389069356
Change-Id: Ic1d8964e96193ca93e05a9a39e286b84ffb61b06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6280953
Commit-Queue: Devon Loehr <dloehr@google.com>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
