$ git clone -n https://src.fedoraproject.org/rpms/karton.git /var/lib/mock/f45-build-14575-461/root/chroot_tmpdir/scmroot/karton
Cloning into '/var/lib/mock/f45-build-14575-461/root/chroot_tmpdir/scmroot/karton'...
$ git fetch origin 40cd9b0adc8debe1f348f1e9ea7e5acafe0720fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/karton
 * [new ref]         40cd9b0adc8debe1f348f1e9ea7e5acafe0720fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40cd9b0 Update to latest git snapshot + added upstream patch