$ git clone -n https://src.fedoraproject.org/rpms/gtkhash.git /var/lib/mock/f41-build-side-1-2805884-32866/root/chroot_tmpdir/scmroot/gtkhash
Cloning into '/var/lib/mock/f41-build-side-1-2805884-32866/root/chroot_tmpdir/scmroot/gtkhash'...
$ git fetch origin 1c3979898c1838ac7e7d430da0408432c7b127ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtkhash
 * [new ref]         1c3979898c1838ac7e7d430da0408432c7b127ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c39798 convert GPLv2+ license to SPDX