$ git clone -n https://src.fedoraproject.org/rpms/hpx.git /var/lib/mock/f31-build-104087-33608/root/thebuilddir/tmp/scmroot/hpx
Cloning into '/var/lib/mock/f31-build-104087-33608/root/thebuilddir/tmp/scmroot/hpx'...
$ git reset --hard f0100d1d94ff1cb9dadd74ceb9dc31066815f320
HEAD is now at f0100d1 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild