$ git clone -n https://src.fedoraproject.org/rpms/libheinz.git /var/lib/mock/f40-build-2219317-52637/root/chroot_tmpdir/scmroot/libheinz
Cloning into '/var/lib/mock/f40-build-2219317-52637/root/chroot_tmpdir/scmroot/libheinz'...
$ git fetch origin c8262ed3ae392d6acea5e0b8cd86f3f891786730:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libheinz
 * [new ref]         c8262ed3ae392d6acea5e0b8cd86f3f891786730 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8262ed initial import rhbz#2251523