$ git clone -n https://src.fedoraproject.org/rpms/cjson.git /var/lib/mock/f40-build-2283594-55595/root/chroot_tmpdir/scmroot/cjson
Cloning into '/var/lib/mock/f40-build-2283594-55595/root/chroot_tmpdir/scmroot/cjson'...
$ git fetch origin f689d01ba2888d11c315e6c12d9a14086dba8a8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cjson
 * [new ref]         f689d01ba2888d11c315e6c12d9a14086dba8a8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f689d01 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild