$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-archive.git /var/lib/mock/f41-build-side-1-2954368-35544/root/chroot_tmpdir/scmroot/rust-gix-archive
Cloning into '/var/lib/mock/f41-build-side-1-2954368-35544/root/chroot_tmpdir/scmroot/rust-gix-archive'...
$ git fetch origin c765131f9ef79c6140dda8fa461dcd474e3978f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-archive
 * [new ref]         c765131f9ef79c6140dda8fa461dcd474e3978f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c765131 Update to version 0.15.0 (rhbz#2307375)