$ git clone -n https://src.fedoraproject.org/rpms/golang-sr-nelsam-hel.git /var/lib/mock/f38-build-side-42-init-devel-1415559-31434/root/chroot_tmpdir/scmroot/golang-sr-nelsam-hel
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1415559-31434/root/chroot_tmpdir/scmroot/golang-sr-nelsam-hel'...
$ git fetch origin c3999985d49020afdf724180fac50363c5da0ba7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-sr-nelsam-hel
 * [new ref]         c3999985d49020afdf724180fac50363c5da0ba7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c399998 Added the README