$ git clone -n https://src.fedoraproject.org/rpms/python-jnius.git /var/lib/mock/f45-build-31223-651/root/chroot_tmpdir/scmroot/python-jnius
Cloning into '/var/lib/mock/f45-build-31223-651/root/chroot_tmpdir/scmroot/python-jnius'...
$ git fetch origin c087241f0bbd90179438c14d54a384f3da3504e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jnius
 * [new ref]         c087241f0bbd90179438c14d54a384f3da3504e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c087241 Fix rhbz#2377824