$ git clone -n https://src.fedoraproject.org/rpms/R-wesanderson.git /var/lib/mock/f40-build-2233297-53370/root/chroot_tmpdir/scmroot/R-wesanderson
Cloning into '/var/lib/mock/f40-build-2233297-53370/root/chroot_tmpdir/scmroot/R-wesanderson'...
$ git fetch origin 9d9b25b7b8c3eb2cb70c4304829d3dd5bc90887e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-wesanderson
 * [new ref]         9d9b25b7b8c3eb2cb70c4304829d3dd5bc90887e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d9b25b 0.3.7