$ git clone -n https://src.fedoraproject.org/rpms/HepMC.git /var/lib/mock/f31-build-48875-27197/root/thebuilddir/tmp/scmroot/HepMC
Cloning into '/var/lib/mock/f31-build-48875-27197/root/thebuilddir/tmp/scmroot/HepMC'...
$ git reset --hard 16b5fd401e4c83c5801fba74ee0fc665c5808e50
HEAD is now at 16b5fd4 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild