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hello, uv2nix world

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Alex Tau 2025-04-27 21:42:05 +03:00
parent 4fc491f61a
commit 83a5ff3909
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README.md Normal file
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{
"nodes": {
"nixpkgs": {
"locked": {
"lastModified": 1745487689,
"narHash": "sha256-FQoi3R0NjQeBAsEOo49b5tbDPcJSMWc3QhhaIi9eddw=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "5630cf13cceac06cefe9fc607e8dfa8fb342dde3",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-24.11",
"repo": "nixpkgs",
"type": "github"
}
},
"pyproject-build-systems": {
"inputs": {
"nixpkgs": [
"nixpkgs"
],
"pyproject-nix": [
"pyproject-nix"
],
"uv2nix": [
"uv2nix"
]
},
"locked": {
"lastModified": 1744599653,
"narHash": "sha256-nysSwVVjG4hKoOjhjvE6U5lIKA8sEr1d1QzEfZsannU=",
"owner": "pyproject-nix",
"repo": "build-system-pkgs",
"rev": "7dba6dbc73120e15b558754c26024f6c93015dd7",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "build-system-pkgs",
"type": "github"
}
},
"pyproject-nix": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1743438845,
"narHash": "sha256-1GSaoubGtvsLRwoYwHjeKYq40tLwvuFFVhGrG8J9Oek=",
"owner": "pyproject-nix",
"repo": "pyproject.nix",
"rev": "8063ec98edc459571d042a640b1c5e334ecfca1e",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "pyproject.nix",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs",
"pyproject-build-systems": "pyproject-build-systems",
"pyproject-nix": "pyproject-nix",
"uv2nix": "uv2nix"
}
},
"uv2nix": {
"inputs": {
"nixpkgs": [
"nixpkgs"
],
"pyproject-nix": [
"pyproject-nix"
]
},
"locked": {
"lastModified": 1745697651,
"narHash": "sha256-r4A/fkiCenEapHkjJWPiNUZEfviuXMCr6mRozJ5dC4o=",
"owner": "pyproject-nix",
"repo": "uv2nix",
"rev": "cb6508484d534dafd097713b575f2aebc3417de0",
"type": "github"
},
"original": {
"owner": "pyproject-nix",
"repo": "uv2nix",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

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flake.nix Normal file
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{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
pyproject-nix = {
url = "github:pyproject-nix/pyproject.nix";
inputs.nixpkgs.follows = "nixpkgs";
};
uv2nix = {
url = "github:pyproject-nix/uv2nix";
inputs.pyproject-nix.follows = "pyproject-nix";
inputs.nixpkgs.follows = "nixpkgs";
};
pyproject-build-systems = {
url = "github:pyproject-nix/build-system-pkgs";
inputs.pyproject-nix.follows = "pyproject-nix";
inputs.uv2nix.follows = "uv2nix";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs =
{
self,
nixpkgs,
uv2nix,
pyproject-nix,
pyproject-build-systems,
...
}:
let
inherit (nixpkgs) lib;
# Load a uv workspace from a workspace root.
# Uv2nix treats all uv projects as workspace projects.
workspace = uv2nix.lib.workspace.loadWorkspace { workspaceRoot = ./.; };
# Create package overlay from workspace.
overlay = workspace.mkPyprojectOverlay {
# Prefer prebuilt binary wheels as a package source.
# Sdists are less likely to "just work" because of the metadata missing from uv.lock.
# Binary wheels are more likely to, but may still require overrides for library dependencies.
sourcePreference = "wheel"; # or sourcePreference = "sdist";
# Optionally customise PEP 508 environment
# environ = {
# platform_release = "5.10.65";
# };
};
# Extend generated overlay with build fixups
#
# Uv2nix can only work with what it has, and uv.lock is missing essential metadata to perform some builds.
# This is an additional overlay implementing build fixups.
# See:
# - https://pyproject-nix.github.io/uv2nix/FAQ.html
pyprojectOverrides = _final: _prev: {
# Implement build fixups here.
# Note that uv2nix is _not_ using Nixpkgs buildPythonPackage.
# It's using https://pyproject-nix.github.io/pyproject.nix/build.html
};
# This example is only using x86_64-linux
pkgs = nixpkgs.legacyPackages.x86_64-linux;
# Use Python 3.12 from nixpkgs
python = pkgs.python312;
# Construct package set
pythonSet =
# Use base package set from pyproject.nix builders
(pkgs.callPackage pyproject-nix.build.packages {
inherit python;
}).overrideScope
(
lib.composeManyExtensions [
pyproject-build-systems.overlays.default
overlay
pyprojectOverrides
]
);
in
{
# Package a virtual environment as our main application.
#
# Enable no optional dependencies for production build.
packages.x86_64-linux.default = pythonSet.mkVirtualEnv "hello-world-env" workspace.deps.default;
# Make hello runnable with `nix run`
apps.x86_64-linux = {
default = {
type = "app";
program = "${self.packages.x86_64-linux.default}/bin/hello";
};
};
# This example provides two different modes of development:
# - Impurely using uv to manage virtual environments
# - Pure development using uv2nix to manage virtual environments
devShells.x86_64-linux = {
# It is of course perfectly OK to keep using an impure virtualenv workflow and only use uv2nix to build packages.
# This devShell simply adds Python and undoes the dependency leakage done by Nixpkgs Python infrastructure.
impure = pkgs.mkShell {
packages = [
python
pkgs.uv
];
env =
{
# Prevent uv from managing Python downloads
UV_PYTHON_DOWNLOADS = "never";
# Force uv to use nixpkgs Python interpreter
UV_PYTHON = python.interpreter;
}
// lib.optionalAttrs pkgs.stdenv.isLinux {
# Python libraries often load native shared objects using dlopen(3).
# Setting LD_LIBRARY_PATH makes the dynamic library loader aware of libraries without using RPATH for lookup.
LD_LIBRARY_PATH = lib.makeLibraryPath pkgs.pythonManylinuxPackages.manylinux1;
};
shellHook = ''
unset PYTHONPATH
'';
};
# This devShell uses uv2nix to construct a virtual environment purely from Nix, using the same dependency specification as the application.
# The notable difference is that we also apply another overlay here enabling editable mode ( https://setuptools.pypa.io/en/latest/userguide/development_mode.html ).
#
# This means that any changes done to your local files do not require a rebuild.
#
# Note: Editable package support is still unstable and subject to change.
uv2nix =
let
# Create an overlay enabling editable mode for all local dependencies.
editableOverlay = workspace.mkEditablePyprojectOverlay {
# Use environment variable
root = "$REPO_ROOT";
# Optional: Only enable editable for these packages
# members = [ "hello-world" ];
};
# Override previous set with our overrideable overlay.
editablePythonSet = pythonSet.overrideScope (
lib.composeManyExtensions [
editableOverlay
# Apply fixups for building an editable package of your workspace packages
(final: prev: {
hello-world = prev.hello-world.overrideAttrs (old: {
# It's a good idea to filter the sources going into an editable build
# so the editable package doesn't have to be rebuilt on every change.
src = lib.fileset.toSource {
root = old.src;
fileset = lib.fileset.unions [
(old.src + "/pyproject.toml")
(old.src + "/README.md")
(old.src + "/src/hello_world/__init__.py")
];
};
# Hatchling (our build system) has a dependency on the `editables` package when building editables.
#
# In normal Python flows this dependency is dynamically handled, and doesn't need to be explicitly declared.
# This behaviour is documented in PEP-660.
#
# With Nix the dependency needs to be explicitly declared.
nativeBuildInputs =
old.nativeBuildInputs
++ final.resolveBuildSystem {
editables = [ ];
};
});
})
]
);
# Build virtual environment, with local packages being editable.
#
# Enable all optional dependencies for development.
virtualenv = editablePythonSet.mkVirtualEnv "hello-world-dev-env" workspace.deps.all;
in
pkgs.mkShell {
packages = [
virtualenv
pkgs.uv
];
env = {
# Don't create venv using uv
UV_NO_SYNC = "1";
# Force uv to use Python interpreter from venv
UV_PYTHON = "${virtualenv}/bin/python";
# Prevent uv from downloading managed Python's
UV_PYTHON_DOWNLOADS = "never";
};
shellHook = ''
# Undo dependency propagation by nixpkgs.
unset PYTHONPATH
# Get repository root using git. This is expanded at runtime by the editable `.pth` machinery.
export REPO_ROOT=$(git rev-parse --show-toplevel)
'';
};
};
};
}

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pyproject.toml Normal file
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[project]
name = "hello-world"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.12"
dependencies = [
"urllib3>=2.2.3",
]
[project.scripts]
hello = "hello_world:hello"
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"
[dependency-groups]
dev = [
"ruff>=0.6.7",
]

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src/hello_world/__init__.py Normal file
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def hello() -> None:
print("Hello from hello-world!")

56
uv.lock generated Normal file
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version = 1
revision = 1
requires-python = ">=3.12"
[[package]]
name = "hello-world"
version = "0.1.0"
source = { editable = "." }
dependencies = [
{ name = "urllib3" },
]
[package.dev-dependencies]
dev = [
{ name = "ruff" },
]
[package.metadata]
requires-dist = [{ name = "urllib3", specifier = ">=2.2.3" }]
[package.metadata.requires-dev]
dev = [{ name = "ruff", specifier = ">=0.6.7" }]
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