$ git clone -n https://src.fedoraproject.org/rpms/Box2D.git /var/lib/mock/f31-build-64306-29541/root/chroot_tmpdir/scmroot/Box2D
Cloning into '/var/lib/mock/f31-build-64306-29541/root/chroot_tmpdir/scmroot/Box2D'...
$ git reset --hard b09fb74c32e9a6f5cfda97ebd3ff8603f81752e5
HEAD is now at b09fb74 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild