$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-index.git /var/lib/mock/f40-build-1794046-24862/root/chroot_tmpdir/scmroot/rust-gix-index
Cloning into '/var/lib/mock/f40-build-1794046-24862/root/chroot_tmpdir/scmroot/rust-gix-index'...
$ git fetch origin 3f19920d49b1c278aee6258733fe24e8a2a5ed02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-index
 * [new ref]         3f19920d49b1c278aee6258733fe24e8a2a5ed02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f19920 Update to version 0.33.1 (rhbz#2299573)