$ git clone -n https://src.fedoraproject.org/rpms/rpkg.git /var/lib/mock/f41-build-side-1-2741761-30931/root/chroot_tmpdir/scmroot/rpkg
Cloning into '/var/lib/mock/f41-build-side-1-2741761-30931/root/chroot_tmpdir/scmroot/rpkg'...
$ git fetch origin 4d309050b8a601efc3b290e6f29d3af78daa7228:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpkg
 * [new ref]         4d309050b8a601efc3b290e6f29d3af78daa7228 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d30905 A few patches: