$ git clone -n https://src.fedoraproject.org/rpms/libXt.git /var/lib/mock/f40-build-2238058-53555/root/chroot_tmpdir/scmroot/libXt
Cloning into '/var/lib/mock/f40-build-2238058-53555/root/chroot_tmpdir/scmroot/libXt'...
$ git fetch origin 449f6d9f8ca7f4c3c2b47c0d073bf04ef7c79d07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libXt
 * [new ref]         449f6d9f8ca7f4c3c2b47c0d073bf04ef7c79d07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 449f6d9 libXt 1.3.0