$ git clone -n https://src.fedoraproject.org/rpms/rnp.git /var/lib/mock/f40-build-2060645-49167/root/chroot_tmpdir/scmroot/rnp
Cloning into '/var/lib/mock/f40-build-2060645-49167/root/chroot_tmpdir/scmroot/rnp'...
$ git fetch origin 6b6bf691400affbc7189238307b9448097e79f6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rnp
 * [new ref]         6b6bf691400affbc7189238307b9448097e79f6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b6bf69 use system libsexpp