tree b293b6dc031c5ca211c974cedf39e076c5343d69
parent b85e76a86a0d8064be5500f65d1a71c49aa00c22
author Gavin Mak <gavinmak@google.com> 1787672315 -0700
committer gerrit-scoped@luci-project-accounts.iam.gserviceaccount.com <gerrit-scoped@luci-project-accounts.iam.gserviceaccount.com> 1788204819 -0700

project: reuse loaded refs when resolving HEAD

When the regular checkout has already loaded GitRefs, derive its current
branch and HEAD object from that snapshot instead of spawning
symbolic-ref or rev-parse again. Keep linked Git worktrees on their
worktree-specific HEAD path because the shared repository HEAD is not
authoritative for them.

Bug: 543851900
Bug: 553599402
Change-Id: Iec456be5f3c279865b4165a75d1c6df36e331dbc
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/623181
Commit-Queue: Gavin Mak <gavinmak@google.com>
Reviewed-by: Brian Gan <brgan@google.com>
Tested-by: Gavin Mak <gavinmak@google.com>