$ git clone -n https://src.fedoraproject.org/rpms/R-jsonlite.git /var/lib/mock/f40-build-789474-135730/root/chroot_tmpdir/scmroot/R-jsonlite
Cloning into '/var/lib/mock/f40-build-789474-135730/root/chroot_tmpdir/scmroot/R-jsonlite'...
$ git fetch origin b6e5f306d370319ce5ba0dc7a0cdd1aab45f09cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-jsonlite
 * [new ref]         b6e5f306d370319ce5ba0dc7a0cdd1aab45f09cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6e5f30 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild