builtin/clone: allow remote helpers to detect repo

Hi,

this patch series addresses a regression reported by Mike in Git v2.44 where remote helpers cannot access the Git repository anymore when running git-clone(1).

The root cause of this is that we have started to initialize the refdb at a later point, after the helper is spawned. This is required such that we can initialize it with the correct object format, which fixes clones of SHA256 repositories with the reftable format and when using bundles.

The proposed fix here is to partially initialize the refdb with just enough data such that it can be discovered. The fix isn't pretty, but addresses the issue. I also couldn't come up with a better idea than this.

Patrick

Patrick Steinhardt (2):
refs/reftable: don't fail empty transactions in repo without HEAD builtin/clone: allow remote helpers to detect repo

 builtin/clone.c            | 46 ++++++++++++++++++++++++++++++++++++++
 refs/reftable-backend.c    |  1 +
 setup.c                    |  9 +++++++-
 t/t0610-reftable-basics.sh | 13 +++++++++++
 t/t5801/git-remote-testgit |  5 +++++
 5 files changed, 73 insertions(+), 1 deletion(-)

base-commit: a2082dbdd315aa4dd3f315545e5b3ab3b3e2d894

2.44.0