$ git clone -n https://src.fedoraproject.org/rpms/atlantik.git /var/lib/mock/f39-build-2045864-48720/root/chroot_tmpdir/scmroot/atlantik
Cloning into '/var/lib/mock/f39-build-2045864-48720/root/chroot_tmpdir/scmroot/atlantik'...
$ git fetch origin c8e4689da1599dfc3e53684b48db955f28b77490:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/atlantik
 * [new ref]         c8e4689da1599dfc3e53684b48db955f28b77490 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8e4689 Rebuild