$ git clone -n https://src.fedoraproject.org/rpms/rubygem-json.git /var/lib/mock/f33-build-177908-44959/root/chroot_tmpdir/scmroot/rubygem-json
Cloning into '/var/lib/mock/f33-build-177908-44959/root/chroot_tmpdir/scmroot/rubygem-json'...
$ git reset --hard cf0411af6940e34134881d84bab8c3122253b3b9
HEAD is now at cf0411a Avoid unexpected JRuby dependency.