$ git clone -n https://src.fedoraproject.org/rpms/gpx-viewer.git /var/lib/mock/f41-build-1028394-18355/root/chroot_tmpdir/scmroot/gpx-viewer
Cloning into '/var/lib/mock/f41-build-1028394-18355/root/chroot_tmpdir/scmroot/gpx-viewer'...
$ git fetch origin c584fc92df01f7dae98dc8467902cd006481f197:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gpx-viewer
 * [new ref]         c584fc92df01f7dae98dc8467902cd006481f197 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c584fc9 Eliminate use of obsolete %patchN syntax (#2283636)