126 lines
4.3 KiB
Nix
126 lines
4.3 KiB
Nix
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{
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lib,
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pkgs,
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python,
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workspace,
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pythonSet,
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...
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}:
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{
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# It is of course perfectly OK to keep using an impure virtualenv workflow and only use uv2nix to build packages.
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# This devShell simply adds Python and undoes the dependency leakage done by Nixpkgs Python infrastructure.
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impure = pkgs.mkShell {
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packages = [
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python
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pkgs.uv
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];
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env =
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{
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# Prevent uv from managing Python downloads
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UV_PYTHON_DOWNLOADS = "never";
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# Force uv to use nixpkgs Python interpreter
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UV_PYTHON = python.interpreter;
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}
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// lib.optionalAttrs pkgs.stdenv.isLinux {
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# Python libraries often load native shared objects using dlopen(3).
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# Setting LD_LIBRARY_PATH makes the dynamic library loader aware of libraries without using RPATH for lookup.
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LD_LIBRARY_PATH = lib.makeLibraryPath pkgs.pythonManylinuxPackages.manylinux1;
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};
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shellHook = ''
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unset PYTHONPATH
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'';
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};
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# This devShell uses uv2nix to construct a virtual environment purely from Nix, using the same dependency specification as the application.
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# The notable difference is that we also apply another overlay here enabling editable mode ( https://setuptools.pypa.io/en/latest/userguide/development_mode.html ).
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#
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# This means that any changes done to your local files do not require a rebuild.
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#
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# Note: Editable package support is still unstable and subject to change.
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uv2nix =
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let
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# Create an overlay enabling editable mode for all local dependencies.
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editableOverlay = workspace.mkEditablePyprojectOverlay {
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# Use environment variable
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root = "$REPO_ROOT";
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# Optional: Only enable editable for these packages
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# members = [ "flupdt" ];
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};
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# Override previous set with our overrideable overlay.
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editablePythonSet = pythonSet.overrideScope (
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lib.composeManyExtensions [
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editableOverlay
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# Apply fixups for building an editable package of your workspace packages
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(final: prev: {
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flupdt = prev.flupdt.overrideAttrs (old: {
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# It's a good idea to filter the sources going into an editable build
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# so the editable package doesn't have to be rebuilt on every change.
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src = lib.fileset.toSource {
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root = old.src;
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fileset = lib.fileset.unions [
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(old.src + "/pyproject.toml")
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(old.src + "/README.md")
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(old.src + "/flupdt/__init__.py")
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(old.src + "/flupdt/cli.py")
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(old.src + "/flupdt/common.py")
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(old.src + "/flupdt/flake_build.py")
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(old.src + "/flupdt/flake_diff.py")
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(old.src + "/flupdt/flake_eval.py")
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(old.src + "/flupdt/flake_show.py")
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(old.src + "/flupdt/main.py")
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];
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};
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# Hatchling (our build system) has a dependency on the `editables` package when building editables.
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#
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# In normal Python flows this dependency is dynamically handled, and doesn't need to be explicitly declared.
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# This behaviour is documented in PEP-660.
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#
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# With Nix the dependency needs to be explicitly declared.
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nativeBuildInputs =
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old.nativeBuildInputs
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++ final.resolveBuildSystem {
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editables = [ ];
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};
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});
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})
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]
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);
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# Build virtual environment, with local packages being editable.
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#
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# Enable all optional dependencies for development.
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virtualenv = editablePythonSet.mkVirtualEnv "flupdt-dev-env" workspace.deps.all;
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in
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pkgs.mkShell {
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packages = [
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virtualenv
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pkgs.uv
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];
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env = {
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# Don't create venv using uv
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UV_NO_SYNC = "1";
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# Force uv to use Python interpreter from venv
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UV_PYTHON = "${virtualenv}/bin/python";
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# Prevent uv from downloading managed Python's
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UV_PYTHON_DOWNLOADS = "never";
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};
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shellHook = ''
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# Undo dependency propagation by nixpkgs.
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unset PYTHONPATH
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# Get repository root using git. This is expanded at runtime by the editable `.pth` machinery.
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export REPO_ROOT=$(git rev-parse --show-toplevel)
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'';
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};
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}
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