$ git clone -n https://src.fedoraproject.org/rpms/rubygem-json.git /var/lib/mock/f31-build-90097-32165/root/thebuilddir/tmp/scmroot/rubygem-json
Cloning into '/var/lib/mock/f31-build-90097-32165/root/thebuilddir/tmp/scmroot/rubygem-json'...
$ git reset --hard fe379d6df07e5007fd590951025af5b1a0c3d70d
HEAD is now at fe379d6 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild