shell-build123d.nix

# shell-build123d.nix

# Shell environment for build123d
# https://build123d.readthedocs.io/en/latest/index.html

# https://wiki.nixos.org/wiki/Python#Using_nix-shell_alongside_pip

{ pkgs ? import <nixpkgs> {} }:

let
  myPython = pkgs.python311;
  pythonPackages = pkgs.python311Packages;

  pythonWithPkgs = myPython.withPackages (pythonPkgs: with pythonPkgs; [
    # This list contains tools for Python development.
    # You can also add other tools, like black.
    #
    # Note that even if you add Python packages here like PyTorch or Tensorflow,
    # they will be reinstalled when running `pip -r requirements.txt` because
    # virtualenv is used below in the shellHook.
    ipython
    pip
    setuptools
    virtualenvwrapper
    wheel
    black
    # https://discourse.nixos.org/t/what-package-provides-libstdc-so-6/18707/3
    stdenv
  ]);

  extraBuildInputs = with pkgs; [
    # this list contains packages that you want to be available at runtime and might not be able to be installed properly via pip
    pythonPackages.pandas
    pythonPackages.stdenv
    pythonPackages.requests
    stdenv.cc.cc.lib
    gcc
    expat
    libGL
    xorg.libX11
    zlib
  ];

in
  import ./shell-python.nix {
    extraBuildInputs=extraBuildInputs;
    # extraLibPackages=extraLibPackages;
    myPython=myPython;
    pythonWithPkgs=pythonWithPkgs;
  }

shell-python.nix

# python-shell.nix

{ pkgs ? import <nixpkgs> {}, extraBuildInputs ? [], myPython ? pkgs.python3, extraLibPackages ? [], pythonWithPkgs? myPython }:

let
  buildInputs  = with pkgs; [
    clang
    llvmPackages_16.bintools
    rustup
    # stdenvNoCC
    # stdenvNoLibs
    # stdenv_32bit
    # gccStdenv
    # gccStdenvNoLibs
    # libcxxStdenv
    # gccMultiStdenv
    # gcc49Stdenv
  ] ++ extraBuildInputs;

  lib-path = with pkgs; lib.makeLibraryPath buildInputs;

  shell = pkgs.mkShell {
    buildInputs = [
     # my python and packages
      pythonWithPkgs

      # other packages needed for compiling python libs
      pkgs.readline
      pkgs.libffi
      pkgs.openssl

      pkgs.git
      pkgs.openssh
      pkgs.rsync
      pkgs.cowsay
      pkgs.lolcat
      pkgs.nix-index

      # unfortunately needed because of messing with LD_LIBRARY_PATH below
      pkgs.gcc
      pkgs.stdenv
      # pkgs.stdenv-linux
      pkgs.stdenvNoCC
      pkgs.stdenvNoLibs
      pkgs.stdenv_32bit
      pkgs.gccStdenv
      pkgs.gccStdenvNoLibs
      pkgs.libcxxStdenv
      pkgs.gccMultiStdenv
      pkgs.gcc49Stdenv
  ] ++ extraBuildInputs;

  GREETING = "Entering build123d development shell!";

  shellHook = ''
    # Allow the use of wheels.
    SOURCE_DATE_EPOCH=$(date +%s)

    # Augment the dynamic linker path
    export "LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${lib-path}"

    # https://discourse.nixos.org/t/what-package-provides-libstdc-so-6/18707/4
    # fixes libstdc++ issues and libgl.so issues
    LD_LIBRARY_PATH=lib.makeLibraryPath [ pkgs.stdenv.cc.cc ];

    # Setup the virtual environment if it doesn't already exist.
    VENV=shell-build123d

    if test ! -d $VENV; then
      virtualenv $VENV
    fi

    source ./$VENV/bin/activate
    export PYTHONPATH=$PYTHONPATH:`pwd`/$VENV/${myPython.sitePackages}/
    pip install --upgrade pip
    pip install build123d
    echo $GREETING | cowsay | lolcat
    '';
  };

in
  shell

test-build123d.py

# test-build123d.py

# Installation test
# https://build123d.readthedocs.io/en/latest/installation.html#test-your-build123d-installation

from build123d import *
print(Solid.make_box(1,2,3).show_topology(limit_class="Face"))

test-shell.sh

# test-shell.sh

# https://discourse.nixos.org/t/how-to-create-a-development-environment-for-build123d/45146/2?u=technicus

nix-shell shell-build123d.nix --command "python ./test-build123d.py"

$ python

Python 3.11.8 (main, Feb  6 2024, 21:21:21) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from build123d import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/technicus/Projects/CAD/build123d/build123d_03/build123d/lib/python3.11/site-packages/build123d/__init__.py", line 3, in <module>
    from build123d.build_common import *
  File "/home/technicus/Projects/CAD/build123d/build123d_03/build123d/lib/python3.11/site-packages/build123d/build_common.py", line 57, in <module>
    from build123d.geometry import Axis, Location, Plane, Vector, VectorLike
  File "/home/technicus/Projects/CAD/build123d/build123d_03/build123d/lib/python3.11/site-packages/build123d/geometry.py", line 54, in <module>
    from OCP.Bnd import Bnd_Box, Bnd_OBB
ImportError: libstdc++.so.6: cannot open shared object file: No such file or directory

$ nix-locate --top-level libstdc++.so.6 | grep gcc

libgcc.lib                                            0 s /nix/store/c2yb135iv4maadia5f760b3xhbh6jh61-gcc-13.2.0-lib/lib/libstdc++.so.6
libgcc.lib                                    3,101,952 x /nix/store/c2yb135iv4maadia5f760b3xhbh6jh61-gcc-13.2.0-lib/lib/libstdc++.so.6.0.32
libgcc.lib                                        2,494 r /nix/store/c2yb135iv4maadia5f760b3xhbh6jh61-gcc-13.2.0-lib/lib/libstdc++.so.6.0.32-gdb.py

This was solved by rgoulter in How to create a development environment for build123d.

I have since updated the gist and added two test scripts as recommended.

As of now the install is successful for me . . . it remains to be seen if I can do anything with it now.

I created a thread on the NixOS Discourse forum and it was solved by rgoulter with the reply How to create a development environment for build123d.

I also added two test test scripts as recommended.
The install test is working for me as of now.
It is yet to be seen if I can actually do any thing with it.

Hey, I made a flake to do this, except instead of installing shared libraries so the binary python packages work, I used poetry2nix to build NixOS-native packages in this repo:

https://github.com/eraserhd/gridfinity-ezcal

I might break it out to somewhere else.

Please do!