$ git clone -n https://src.fedoraproject.org/rpms/gmic.git /var/lib/mock/f42-build-887853-188403/root/chroot_tmpdir/scmroot/gmic
Cloning into '/var/lib/mock/f42-build-887853-188403/root/chroot_tmpdir/scmroot/gmic'...
$ git fetch origin 35be21dd14fbf76eb621d7a3a8c53138e5de7650:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmic
 * [new ref]         35be21dd14fbf76eb621d7a3a8c53138e5de7650 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 35be21d fix build