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Gavin Mak
95d7c8c0df
After repo.reprojectcmd exits 0, _Reproject ran `git diff-index --cached
--name-only <revid>^{tree}` to verify that the index matches the target
commit's tree.
Peeling <revid>^{tree} and comparing every entry against the index
forces Git to read the target commit and walk every tree object in the
target revision from .git/objects.
reprojectcmd exists for virtualized filesystems such as ABFS whose
checkout command materializes the worktree and writes .git/index from
its own tree metadata without reading .git/objects/pack/*-trees-*.pack.
Running diff-index against <revid>^{tree} afterward forces Git to fault
in the tree packfiles over the network (260 FetchTrees pack downloads /
1.64 GiB across a 3,296-project Android checkout).
Trust reprojectcmd's exit status for index materialization instead of
re-walking the target tree in Git, while keeping the HEAD postcondition
check that verifies the command did not modify refs.
Bug: 543101585
Change-Id: Ie5feea41a4191245232c6763a489d01596370c55
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/643004
Commit-Queue: Gavin Mak <gavinmak@google.com>
Tested-by: Gavin Mak <gavinmak@google.com>
Reviewed-by: Brian Gan <brgan@google.com>