$ git clone -n https://src.fedoraproject.org/rpms/gitg.git /var/lib/mock/f41-build-side-1-2793317-32695/root/chroot_tmpdir/scmroot/gitg
Cloning into '/var/lib/mock/f41-build-side-1-2793317-32695/root/chroot_tmpdir/scmroot/gitg'...
$ git fetch origin a3a98b38efa8c234b989c08ad318214fe1993a82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gitg
 * [new ref]         a3a98b38efa8c234b989c08ad318214fe1993a82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3a98b3 Rebuild against gspell