$ git clone -n https://src.fedoraproject.org/rpms/fftw.git /var/lib/mock/f31-build-91770-32335/root/chroot_tmpdir/scmroot/fftw
Cloning into '/var/lib/mock/f31-build-91770-32335/root/chroot_tmpdir/scmroot/fftw'...
$ git reset --hard b01e78f90672565a5bdc32e85433c607fa0a22d9
HEAD is now at b01e78f - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild