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barebones flake.nix #532

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6ccf442
barebones flake.nix
CupOfTeaJay Aug 2, 2025
54e738d
Merge branch 'TheBevyFlock:main' into main
CupOfTeaJay Oct 4, 2025
04e8675
nix flake update
CupOfTeaJay Oct 4, 2025
0feb7ed
apply review suggestions && nix flake update
CupOfTeaJay Oct 12, 2025
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61 changes: 61 additions & 0 deletions flake.lock
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41 changes: 41 additions & 0 deletions flake.nix
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@musjj musjj Oct 16, 2025 •
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Hey, I've tested out your PR and you just need to make a few changes to make bevy lint work:

diff --git a/tmp/.psub.oO4pntvWFW b/flake.nix
index 980c6ba..cadee16 100644
--- a/tmp/.psub.oO4pntvWFW
+++ b/flake.nix
@@ -4,13 +4,17 @@
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, flake-utils, nixpkgs }:
+  outputs = { self, flake-utils, nixpkgs, rust-overlay }:
     flake-utils.lib.eachDefaultSystem (
       system:
       let
-        pkgs = nixpkgs.legacyPackages.${system};
+        pkgs = nixpkgs.legacyPackages.${system}.extend rust-overlay.overlays.default;
 
         nativeBuildInputs = with pkgs; [
           pkg-config
@@ -19,17 +23,34 @@
         buildInputs = with pkgs; [
           openssl
         ];
+
+        toolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+
+        rustPlatform = pkgs.makeRustPlatform {
+          cargo = toolchain;
+          rustc = toolchain;
+        };
       in
       {
-        packages.default = pkgs.rustPlatform.buildRustPackage {
+        packages.default = rustPlatform.buildRustPackage {
           pname = "bevy";
           version = "0.1.0-dev";
           src = ./.;
-          cargoLock = {
-            lockFile = ./Cargo.lock;
-          };
+          cargoLock.lockFile = ./Cargo.lock;
+          cargoBuildFlags = [ "--all" ];
           doCheck = false;
+
+          nativeBuildInputs = nativeBuildInputs ++ (with pkgs; [ makeBinaryWrapper ]);
-          inherit buildInputs nativeBuildInputs;
+          inherit buildInputs;
+
+          postInstall = ''
+            for bin in $out/bin/bevy{,_lint}; do
+              wrapProgram $bin --set BEVY_LINT_SYSROOT ${toolchain}
+            done
+          '';
         };
 
         devShells.default = pkgs.mkShell {

A few important points:

  1. Nightly toolchain
    bevy_lint requires the nightly compiler, so we need to pull in a community-maintained overlay since nixpkgs doesn't provide one. The rust-toolchain.toml from the repo is used here, so we'll never go out-of-sync. See the official manual for details.
  2. Sysroot location
    We can't expect rustup to be available on NixOS systems, so we need to point BEVY_LINT_SYSROOT to the same nightly toolchain used to build the linter.
  3. cargoBuildFlags = [ "--all" ];
    This just builds all the packages in the workspace so that we get both bevy and bevy_lint. Is it worth it to be more specific?

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Does setting BEVY_LINT_SYSROOT for the bevy cli (not the bevy_lint cli) do anything, or should it be set for only bevy_cli?

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Does setting BEVY_LINT_SYSROOT for the bevy cli (not the bevy_lint cli) do anything, or should it be set for only bevy_cli?

The Bevy CLI doesn't read BEVY_LINT_SYSROOT, but if you run the linter through the CLI (such as with bevy lint web, for example), you'll still want BEVY_LINT_SYSROOT to be set. Check out the docs on environmental variables for more details. :)

Original file line number Diff line number Diff line change
@@ -0,0 +1,41 @@
{
description = "A Bevy CLI tool and linter";

inputs = {
flake-utils.url = "github:numtide/flake-utils";
nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
};

outputs = { self, flake-utils, nixpkgs }:
flake-utils.lib.eachDefaultSystem (
system:
let
pkgs = nixpkgs.legacyPackages.${system};

nativeBuildInputs = with pkgs; [
pkg-config
];

buildInputs = with pkgs; [
openssl
# rustup
];
in
{
packages.default = pkgs.rustPlatform.buildRustPackage {
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Minor nit, but packages are usually structured something like this:

packages = {
  default = self.outputs.packages.${system}.bevy;
  bevy = ...;
}

pname = "bevy_cli";
version = "0.1.0-dev";
src = ./.;
cargoLock = {
lockFile = ./Cargo.lock;
};
doCheck = false;
inherit buildInputs nativeBuildInputs;
};

devShells.default = pkgs.mkShell {
inherit buildInputs nativeBuildInputs;
};
}
);
}