$ git clone -n https://src.fedoraproject.org/rpms/cmatrix.git /var/lib/mock/f31-build-65684-29745/root/chroot_tmpdir/scmroot/cmatrix
Cloning into '/var/lib/mock/f31-build-65684-29745/root/chroot_tmpdir/scmroot/cmatrix'...
$ git reset --hard 5bcb0be117c05a7f8c5bb157ee96f10f60ab8be5
HEAD is now at 5bcb0be - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild