I’m trying to configure separate setups for NixOS, WSL, and macOS (Darwin).
I discovered that I can use the WSL_DISTRO_NAME environment variable together
with the native flags pkgs.stdenv.isLinux and pkgs.stdenv.isDarwin to detect each platform.
Here’s my flake.nix
{
description = "Custom basic linux configuration";
inputs = {
nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
nixos-wsl.url = "github:nix-community/NixOS-WSL/main";
home-manager = {
url = "github:nix-community/home-manager";
inputs.nixpkgs.follows = "nixpkgs";
};
system-manager = {
url = "github:numtide/system-manager";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs = { self, nixpkgs, home-manager, system-manager, nixos-wsl, ... }:
let
lib = nixpkgs.lib;
system = "x86_64-linux";
# Overlays
pkgs = import nixpkgs {
inherit system;
overlays = [(final: prev: {
google-chrome = prev.google-chrome.override {
commandLineArgs =
"--ozone-platform-hint=auto --enable-wayland-ime --enable-features=TouchpadOverscrollHistoryNavigation --wayland-text-input-version=3";
};
slack = prev.symlinkJoin {
name = "slack";
paths = [ prev.slack ];
buildInputs = [ prev.makeWrapper ];
postBuild = ''
wrapProgram $out/bin/slack \
--add-flags "--ozone-platform-hint=auto --enable-wayland-ime --enable-features=TouchpadOverscrollHistoryNavigation --wayland-text-input-version=3"
'';
};
})];
config.allowUnfree = true;
};
# Flags of OS
isWsl = !builtins.isNull (builtins.getEnv "WSL_DISTRO_NAME");
isLinux = pkgs.stdenv.isLinux;
isDarwin = pkgs.stdenv.isDarwin;
# Build home-manager by os flag
home = import ./home.nix {
inherit lib pkgs isWsl isLinux isDarwin;
config = {};
};
in {
# Define nixos configuration
nixosConfigurations = {
nixos = nixpkgs.lib.nixosSystem {
inherit system;
inherit pkgs;
modules = [
./configuration.nix
];
};
};
# Define the home-manager configuration
homeConfigurations = {
limjihoon = home-manager.lib.homeManagerConfiguration {
inherit pkgs;
modules = [
home
./limjihoon-user.nix
];
};
};
# Define system manager to cope with linux distro system
systemConfigs.default = system-manager.lib.makeSystemConfig {
modules = [
./modules
];
};
};
}
As I’ve set these flags, I get an error like this
❯ home-manager switch --flake .#limjihoon -b back --show-trace
error:
… from call site
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:57:16:
56| let
57| module = moduleChecks rawModule;
| ^
58| in
… while calling 'moduleChecks'
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:39:5:
38| moduleChecks =
39| raw:
| ^
40| showWarnings (
… from call site
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:40:5:
39| raw:
40| showWarnings (
| ^
41| let
… while calling 'showWarnings'
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:17:5:
16| showWarnings =
17| res:
| ^
18| let
… from call site
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:21:5:
20| in
21| lib.fold f res res.config.warnings;
| ^
22|
… while calling 'foldr'
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/lists.nix:139:14:
138| foldr =
139| op: nul: list:
| ^
140| let
… from call site
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/lists.nix:144:5:
143| in
144| fold' 0;
| ^
145|
… while calling 'fold''
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/lists.nix:142:15:
141| len = length list;
142| fold' = n: if n == len then nul else op (elemAt list n) (fold' (n + 1));
| ^
143| in
… while evaluating a branch condition
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/lists.nix:142:18:
141| len = length list;
142| fold' = n: if n == len then nul else op (elemAt list n) (fold' (n + 1));
| ^
143| in
… while calling the 'length' builtin
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/lists.nix:141:13:
140| let
141| len = length list;
| ^
142| fold' = n: if n == len then nul else op (elemAt list n) (fold' (n + 1));
… while evaluating a branch condition
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:45:7:
44| in
45| if failed == [ ] then
| ^
46| raw
… from call site
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:42:18:
41| let
42| failed = collectFailed raw.config;
| ^
43| failedStr = lib.concatStringsSep "\n" (map (x: "- ${x}") failed);
… while calling 'collectFailed'
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:14:19:
13|
14| collectFailed = cfg: map (x: x.message) (lib.filter (x: !x.assertion) cfg.assertions);
| ^
15|
… while calling the 'map' builtin
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:14:24:
13|
14| collectFailed = cfg: map (x: x.message) (lib.filter (x: !x.assertion) cfg.assertions);
| ^
15|
… while calling the 'filter' builtin
at /nix/store/czr9ncbrnp8dj3ih1zjy4hb3bsxyfwhy-source/modules/default.nix:14:44:
13|
14| collectFailed = cfg: map (x: x.message) (lib.filter (x: !x.assertion) cfg.assertions);
| ^
15|
… while evaluating the attribute 'config'
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/modules.nix:359:9:
358| options = checked options;
359| config = checked (removeAttrs config [ "_module" ]);
| ^
360| _module = checked (config._module);
… while calling the 'seq' builtin
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/modules.nix:359:18:
358| options = checked options;
359| config = checked (removeAttrs config [ "_module" ]);
| ^
360| _module = checked (config._module);
… while calling the 'throw' builtin
at /nix/store/nfqw3h3qc2mq37v6amw80b1rpi0g9x61-source/lib/modules.nix:331:13:
330| else
331| throw baseMsg
| ^
332| else
error: The option `NIX_CFLAGS_COMPILE' does not exist. Definition values:
- In `<unknown-file>': ""
Although nix’s pleasent error message, I could not get a clue why it won’t evaluated.
In my assumption, nix won’t evaluate pkgs.stdenv twice.
Does my assumption valid, or is it the other problem ?
FYI : home.nix wasn’t the culprit: I tested it by replacing the OS flags with plain boolean values and saw the same error.
