$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-submodule.git /var/lib/mock/f41-build-side-1-2849434-33912/root/chroot_tmpdir/scmroot/rust-gix-submodule
Cloning into '/var/lib/mock/f41-build-side-1-2849434-33912/root/chroot_tmpdir/scmroot/rust-gix-submodule'...
$ git fetch origin 09120b1236e28d5363059bb7cbd70ace504dc8e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-submodule
 * [new ref]         09120b1236e28d5363059bb7cbd70ace504dc8e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09120b1 Update to version 0.14.0 (rhbz#2299589)