Nixpkgs: adding python package in overlay via callPackage

Created on 10 Oct 2017 · 3Comments · Source: NixOS/nixpkgs

Issue description

In a similar spirit as https://github.com/NixOS/nixpkgs/issues/26487 I am trying to test my python packages from an overlay (In this peculiar case it's more practical for me to do it from an overlay than to fork nixpkgs). So in my otherwise (working) overlay, I've added

  pythonPackages = super.pythonPackages.override {
     # Careful, we're using a different self and super here!
    packageOverrides = self: super: {
        pygccxml =  super.callPackage ../pygccxml.nix {
        # pkgs = super.pkgs;
        # pythonPackages = self.pkgs.python3Packages;
      };
    };
  };

Then when I run a nix-shell, I get:

nix-shell -p 'python.withPackages(ps: [ ps.pygccxml] )' --show-trace                        
error: while evaluating the attribute ‘buildInputs’ of the derivation ‘shell’ at /home/teto/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:98:11:
while evaluating the attribute ‘pkgs’ of the derivation ‘python-2.7.14-env’ at /home/teto/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:98:11:
while evaluating ‘closePropagation’ at /home/teto/nixpkgs/lib/deprecated.nix:228:22, called from /home/teto/nixpkgs/pkgs/development/interpreters/python/wrapper.nix:11:13:
while evaluating ‘uniqList’ at /home/teto/nixpkgs/lib/deprecated.nix:159:14, called from /home/teto/nixpkgs/lib/deprecated.nix:228:29:
while evaluating ‘go’ at /home/teto/nixpkgs/lib/deprecated.nix:160:18, called from /home/teto/nixpkgs/lib/deprecated.nix:166:8:
while evaluating ‘innerClosePropagation’ at /home/teto/nixpkgs/lib/deprecated.nix:211:32, called from /home/teto/nixpkgs/lib/deprecated.nix:228:52:
attribute ‘pygccxml’ missing, at (string):1:92

content of pygccxml.nix:

{ stdenv, pkgs, fetchPypi, pythonPackages }:

pythonPackages.buildPythonPackage rec {
  name = "${pname}-${version}";
  pname = "pygccxml";
  version = "1.9.1";

  src = fetchPypi {
    inherit pname version;
    sha256 = "0x1p62ff7ggb172rjr6sbdrjh1gl3ck3bwxsqlsix8i5wycwvnmv";
  };

  propagatedBuildInputs = [ pkgs.castxml ];
  # buildInputs = [ setuptools_scm pytest pkgs.glibcLocales ];

  checkPhase = ''
    # py.test
  '';

  meta = with stdenv.lib; {
    homepage = https://github.com/gccxml/pygccxml;
    description = "Python package for easy C++ declarations navigation";
    license = licenses.boost;
    maintainers = with maintainers; [ teto ];
  };
}

Technical details

nixos-version=18.03.git.56a5c5f (Impala)
nix version: nix-env (Nix) 1.11.15
Nixpkgs version: "18.03.git.56a5c5fa42"
sandboxing disabled

question

Source

teto

Most helpful comment

I had seen the doc but had missed the pythonPackages = python.pkgs;
This works

  python = super.python.override {
     # Careful, we're using a different self and super here!
    packageOverrides = self: super: {
      # if (super.pkgs ? pygccxml) then null else
        pygccxml =  super.callPackage ../pygccxml.nix {
        # pkgs = super.pkgs;
        # pythonPackages = self.pkgs.python3Packages;
      };
    };
  };

  pythonPackages = python.pkgs;

teto on 10 Oct 2017

👍2

All 3 comments

Check section 9.11.3.2. How to override a Python package? of the Nixpkgs manual.

FRidh on 10 Oct 2017

I had seen the doc but had missed the pythonPackages = python.pkgs;
This works

  python = super.python.override {
     # Careful, we're using a different self and super here!
    packageOverrides = self: super: {
      # if (super.pkgs ? pygccxml) then null else
        pygccxml =  super.callPackage ../pygccxml.nix {
        # pkgs = super.pkgs;
        # pythonPackages = self.pkgs.python3Packages;
      };
    };
  };

  pythonPackages = python.pkgs;

teto on 10 Oct 2017

👍2

@teto your example can be simplified with this PR https://github.com/NixOS/nixpkgs/pull/54266#issuecomment-455592425