$ git clone -n https://src.fedoraproject.org/rpms/rwho.git /var/lib/mock/f41-build-1041579-18982/root/chroot_tmpdir/scmroot/rwho
Cloning into '/var/lib/mock/f41-build-1041579-18982/root/chroot_tmpdir/scmroot/rwho'...
$ git fetch origin ca233b2687d220f4fd6759c0e360f2444749e2e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rwho
 * [new ref]         ca233b2687d220f4fd6759c0e360f2444749e2e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca233b2 Eliminate use of obsolete %patchN syntax (#2283636)