$ git clone -n https://src.fedoraproject.org/rpms/wl-mirror.git /var/lib/mock/f42-build-3426591-45197/root/chroot_tmpdir/scmroot/wl-mirror
Cloning into '/var/lib/mock/f42-build-3426591-45197/root/chroot_tmpdir/scmroot/wl-mirror'...
$ git fetch origin 7f7c3cbfe1524a67b49b5f3f053ca14ed2820127:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wl-mirror
 * [new ref]         7f7c3cbfe1524a67b49b5f3f053ca14ed2820127 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f7c3cb Update to 0.18.0