$ git clone -n https://src.fedoraproject.org/rpms/wl-mirror.git /var/lib/mock/f42-build-side-1-3501296-45974/root/chroot_tmpdir/scmroot/wl-mirror
Cloning into '/var/lib/mock/f42-build-side-1-3501296-45974/root/chroot_tmpdir/scmroot/wl-mirror'...
$ git fetch origin 3a73ca27c076cb59f3fc1e090154c6966a34c27f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wl-mirror
 * [new ref]         3a73ca27c076cb59f3fc1e090154c6966a34c27f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a73ca2 Update to 0.18.1