$ git clone -n https://src.fedoraproject.org/rpms/libva.git /var/lib/mock/f40-build-789859-136086/root/chroot_tmpdir/scmroot/libva
Cloning into '/var/lib/mock/f40-build-789859-136086/root/chroot_tmpdir/scmroot/libva'...
$ git fetch origin 9f77be4e6f86cd3bf1fcd6601da613f85c32af33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libva
 * [new ref]         9f77be4e6f86cd3bf1fcd6601da613f85c32af33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f77be4 Own the alternates directories