$ git clone -n https://src.fedoraproject.org/rpms/json.git /var/lib/mock/f29-build-6606-1623/root/thebuilddir/tmp/scmroot/json
Cloning into '/var/lib/mock/f29-build-6606-1623/root/thebuilddir/tmp/scmroot/json'...
$ git reset --hard 90be0001d5cb522ddfdb481ed6b553a299dc5702
HEAD is now at 90be000 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild