$ git clone -n https://src.fedoraproject.org/rpms/rubygem-idn.git /var/lib/mock/f29-build-5127-1211/root/thebuilddir/tmp/scmroot/rubygem-idn
Cloning into '/var/lib/mock/f29-build-5127-1211/root/thebuilddir/tmp/scmroot/rubygem-idn'...
$ git reset --hard 3654518028a86de263fa87310998f2dc5b9cb619
HEAD is now at 3654518 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild