$ git clone -n https://src.fedoraproject.org/rpms/flexiblas.git /var/lib/mock/f40-build-2193609-51481/root/chroot_tmpdir/scmroot/flexiblas
Cloning into '/var/lib/mock/f40-build-2193609-51481/root/chroot_tmpdir/scmroot/flexiblas'...
$ git fetch origin c06e8d825b5f63d070193e6347a06faa03bb3330:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flexiblas
 * [new ref]         c06e8d825b5f63d070193e6347a06faa03bb3330 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c06e8d8 Add Supplements to help pull wrappers if libraries are installed directly