requirements_override.nix

# let                                                                                                                                                                                                                                                                           
#   remove = element: list: builtins.filter (x: x != element) list;                                                                                                                                                                                                             
#   pbr = pkgs: list: list ++ [ pkgs.pythonPackages.pbr ];                                                                                                                                                                                                                      
# in                                                                                                                                                                                                                                                                            
  { pkgs, python }:

  # remove Twisted from Automat.propagatedBuildInputs                                                                                                                                                                                                                           
  # remove Twisted from incremental.propagatedBuildInputs                                                                                                                                                                                                                       
  # remove fixtures from testtools.propagatedBuildInputs                                                                                                                                                                                                                        
  # remove pyutil from zbase32 propagatedBuildInputs                                                                                                                                                                                                                            

  # remove unittest2 from                                                                                                                                                                                                                                                       
  # mock oauthlib testtools                                                                                                                                                                                                                                                     

  # replace pbr in propagatedBuildInputs for                                                                                                                                                                                                                                    
  # fixtures mock testtools                                                                                                                                                                                                                                                     

  self: super: {

    "Automat" = python.overrideDerivation super."Automat" (old: {
      propagatedBuildInputs = [
        self."attrs"
        self."six"
      ];
    });

    "incremental" = python.overrideDerivation super."incremental" (old: {
      propagatedBuildInputs = [
      ];
    });

    "testtools" = python.overrideDerivation super."testtools" (old: {
      propagatedBuildInputs = [
        pkgs.pythonPackages.pbr
        self."extras"
        self."pbr"
        self."python-mimeparse"
        self."six"
        self."traceback2"
      ];
    });

    "zbase32" = python.overrideDerivation super."zbase32" (old: {
      propagatedBuildInputs = [
      ];
    });

    "mock" = python.overrideDerivation super."mock" (old: {
      propagatedBuildInputs = [
        pkgs.pythonPackages.pbr
        self."Jinja2"
        self."Pygments"
        self."funcsigs"
        self."six"
      ];
    });

    "oauthlib" = python.overrideDerivation super."oauthlib" (old: {
      propagatedBuildInputs = [
        self."blinker"
        self."cryptography"
        self."mock"
      ];
    });
  }