$ git clone -n https://src.fedoraproject.org/rpms/Box2D.git /var/lib/mock/f31-build-48248-27072/root/chroot_tmpdir/scmroot/Box2D
Cloning into '/var/lib/mock/f31-build-48248-27072/root/chroot_tmpdir/scmroot/Box2D'...
$ git reset --hard 4ad3cc191a9022a6bb3e6f5705decb762e5164b2
HEAD is now at 4ad3cc1 - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild