$ git clone -n https://src.fedoraproject.org/rpms/libffi3.1.git /var/lib/mock/f37-build-639631-71321/root/chroot_tmpdir/scmroot/libffi3.1
Cloning into '/var/lib/mock/f37-build-639631-71321/root/chroot_tmpdir/scmroot/libffi3.1'...
$ git reset --hard 20e8c19b5975f21fd0aca0141177957b78b87052
HEAD is now at 20e8c19 Rebuilt for https://fedoraproject.org/wiki/Changes/LIBFFI34