tree 84a63ec8013e93bde092c2f0bf157efb054db981
parent 3f087a8dd94c1e54eb8cda34c4923382607413a8
author kimhappy <hwanhee.kim@laplacian.cc> 1787767461 +0900
committer gerrit-scoped@luci-project-accounts.iam.gserviceaccount.com <gerrit-scoped@luci-project-accounts.iam.gserviceaccount.com> 1787872974 -0700

sync: skip submodules removed from their parent

The submodules to sync are derived from their parent before it is
fetched, so one that the parent's new revision no longer holds a gitlink
for is still synced. Interleaved sync then fails to check it out,
because `git submodule init` no longer knows that path:

  error: Cannot checkout a/c
  error: pathspec '.../a/c' did not match any file(s) known to git

Report such submodules while the gitlinks are read again, and leave them
out of the fetch and of the checkout, so the usual project list update
removes them from the working tree. Phased sync already left them out of
the checkout, but still fetched them.

Nothing is reported as removed while the gitlinks of a parent cannot be
read, since a missing gitlink cannot be told apart from a fetch that did
not happen.

Bug: 550074864
Change-Id: Ia429b35c12758a68e4df73665e5512a201af658a
Signed-off-by: kimhappy <hwanhee.kim@laplacian.cc>
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/621681
Reviewed-by: Gavin Mak <gavinmak@google.com>
Reviewed-by: Brian Gan <brgan@google.com>