$ git clone -n https://src.fedoraproject.org/rpms/cxxtools.git /var/lib/mock/f29-build-5975-1342/root/thebuilddir/tmp/scmroot/cxxtools
Cloning into '/var/lib/mock/f29-build-5975-1342/root/thebuilddir/tmp/scmroot/cxxtools'...
$ git reset --hard 92a38ecb957c54addd5b1b9f624ad7efce2f75c2
HEAD is now at 92a38ec - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild