$ git clone -n https://src.fedoraproject.org/rpms/koko.git /var/lib/mock/f38-build-side-42-init-devel-790569-27993/root/chroot_tmpdir/scmroot/koko
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-790569-27993/root/chroot_tmpdir/scmroot/koko'...
$ git fetch origin c09980eb57fc58b69036324ea39e320aa3820d84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/koko
 * [new ref]         c09980eb57fc58b69036324ea39e320aa3820d84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c09980e Add cities.zip to sources again