$ git clone -n https://src.fedoraproject.org/rpms/clblast.git /var/lib/mock/f40-build-2649888-66867/root/chroot_tmpdir/scmroot/clblast
Cloning into '/var/lib/mock/f40-build-2649888-66867/root/chroot_tmpdir/scmroot/clblast'...
$ git fetch origin 65d920047e215b1b70aaec5ed1d2b414ed916c5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clblast
 * [new ref]         65d920047e215b1b70aaec5ed1d2b414ed916c5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65d9200 update to 1.6.2