$ git clone -n https://src.fedoraproject.org/rpms/Box2D.git /var/lib/mock/f29-build-1856-598/root/thebuilddir/tmp/scmroot/Box2D
Cloning into '/var/lib/mock/f29-build-1856-598/root/thebuilddir/tmp/scmroot/Box2D'...
$ git reset --hard a84d83a75b57ce3c02d44bfcfbbc5b60ed88f8e1
HEAD is now at a84d83a - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild