$ git clone -n https://src.fedoraproject.org/rpms/msgpack.git /var/lib/mock/f38-build-side-42-init-devel-919309-28734/root/chroot_tmpdir/scmroot/msgpack
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-919309-28734/root/chroot_tmpdir/scmroot/msgpack'...
$ git fetch origin c4b151a61642e1d996a060a6cb70c0fa57b3fb02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/msgpack
 * [new ref]         c4b151a61642e1d996a060a6cb70c0fa57b3fb02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4b151a Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild