$ git clone -n https://src.fedoraproject.org/rpms/json.git /var/lib/mock/f40-build-2048893-49008/root/chroot_tmpdir/scmroot/json
Cloning into '/var/lib/mock/f40-build-2048893-49008/root/chroot_tmpdir/scmroot/json'...
$ git fetch origin 21b6671d69483205620553755cd120c73df95e50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/json
 * [new ref]         21b6671d69483205620553755cd120c73df95e50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21b6671 Add patches to fix test failures under GCC 13