$ git clone -n https://src.fedoraproject.org/rpms/hydrogen.git /var/lib/mock/f29-build-6518-1600/root/thebuilddir/tmp/scmroot/hydrogen
Cloning into '/var/lib/mock/f29-build-6518-1600/root/thebuilddir/tmp/scmroot/hydrogen'...
$ git reset --hard c6732aa33c41b5cfd9d8c4f2672aff027228ced7
HEAD is now at c6732aa require gcc, gcc-c++ for building