$ git clone -n https://src.fedoraproject.org/rpms/libva.git /var/lib/mock/f40-build-2607139-63619/root/chroot_tmpdir/scmroot/libva
Cloning into '/var/lib/mock/f40-build-2607139-63619/root/chroot_tmpdir/scmroot/libva'...
$ git fetch origin bf61b4b2321eb2f22a3df1fe4fc0f0f1c9bc1a70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libva
 * [new ref]         bf61b4b2321eb2f22a3df1fe4fc0f0f1c9bc1a70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf61b4b Fixup driverdir in libva.pc