$ git clone -n https://src.fedoraproject.org/rpms/jsoncpp.git /var/lib/mock/f40-build-787475-134779/root/chroot_tmpdir/scmroot/jsoncpp
Cloning into '/var/lib/mock/f40-build-787475-134779/root/chroot_tmpdir/scmroot/jsoncpp'...
$ git fetch origin ca23b0e5b48b06dd6d998811220e5b70fd58d7d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jsoncpp
 * [new ref]         ca23b0e5b48b06dd6d998811220e5b70fd58d7d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca23b0e Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild