$ git clone -n https://src.fedoraproject.org/rpms/maturin.git /var/lib/mock/f38-build-719876-97312/root/chroot_tmpdir/scmroot/maturin
Cloning into '/var/lib/mock/f38-build-719876-97312/root/chroot_tmpdir/scmroot/maturin'...
$ git fetch origin b03fb0a0c938e47e476c6d873f705622494410e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maturin
 * [new ref]         b03fb0a0c938e47e476c6d873f705622494410e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b03fb0a Initial import (#2187698)