$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-json.git /var/lib/mock/f40-build-2038167-48157/root/chroot_tmpdir/scmroot/rust-nu-json
Cloning into '/var/lib/mock/f40-build-2038167-48157/root/chroot_tmpdir/scmroot/rust-nu-json'...
$ git fetch origin 61ba40668df18a6b4cd217decf1db0e7bd32e48c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-json
 * [new ref]         61ba40668df18a6b4cd217decf1db0e7bd32e48c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 61ba406 Update to 0.86.0