$ git clone -n https://src.fedoraproject.org/rpms/rocs.git /var/lib/mock/f45-build-34594-688/root/chroot_tmpdir/scmroot/rocs
Cloning into '/var/lib/mock/f45-build-34594-688/root/chroot_tmpdir/scmroot/rocs'...
$ git fetch origin f3a323d9af718903e89d273abbe7a51b90841d36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rocs
 * [new ref]         f3a323d9af718903e89d273abbe7a51b90841d36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3a323d 26.08.1