$ git clone -n https://src.fedoraproject.org/rpms/cjson.git /var/lib/mock/f40-build-2339519-59655/root/chroot_tmpdir/scmroot/cjson
Cloning into '/var/lib/mock/f40-build-2339519-59655/root/chroot_tmpdir/scmroot/cjson'...
$ git fetch origin b82d7aaec2db0e768407d80cf30bd7f43014ace4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cjson
 * [new ref]         b82d7aaec2db0e768407d80cf30bd7f43014ace4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b82d7aa Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild