writing-nix-config
Patterns for this nix-config flake repository. Use when editing .nix files, adding packages, creating modules, or debugging flake issues.
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- Repositório
- joshsymonds/nix-config
- Última atividade na origem
- 12 de março de 2026 às 21:47
- Idioma detectado do SKILL.md
- inglês
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- writing-nix-config
- description
- Patterns for this nix-config flake repository. Use when editing .nix files, adding packages, creating modules, or debugging flake issues.
# Nix Configuration Patterns
## Critical Rules
| Rule | Why |
|------|-----|
| Run `update` after changes | Nothing takes effect until rebuilt |
| Run `git add` before `nix flake check` | Flakes only see git-tracked files |
| Use `lib.fakeHash` for unknown hashes | Nix will tell you the real hash on build failure |
## Common Mistakes
| Wrong | Right |
|-------|-------|
| Running `nix flake check` on new files without `git add` | `git add <file>` first |
| Editing config and expecting immediate effect | Run `update` to rebuild |
| Guessing SHA256 hashes | Use `lib.fakeHash`, build, copy real hash from error |
| Adding package only to overlay | Also add to `pkgs/default.nix` |
## Commands
```bash
update # Rebuild current system
nix flake check # Validate flake
nix build .#<package> # Build package
nix eval .#nixosConfigurations.<host>.config.<option> # Check config value
```
## Package Pattern
```nix
# pkgs/<name>/default.nix
{ lib, stdenv, fetchFromGitHub, ... }:
stdenv.mkDerivation rec {
pname = "name";
version = "1.0.0";
src = fetchFromGitHub {
owner = "...";
repo = "...";
rev = "v${version}";
hash = "sha256-AAAA..."; # Use lib.fakeHash first, nix will tell you real hash
};
meta = with lib; {
description = "...";
license = licenses.mit;
platforms = platforms.all;
};
}
```
Then add to `pkgs/default.nix` and `overlays/default.nix`.
## Home Manager Module Pattern
```nix
# home-manager/<app>/default.nix
{ pkgs, lib, ... }: {
home.packages = [ pkgs.app ];
# Or use programs.<app> if module exists
programs.app = {
enable = true;
settings = { ... };
};
}
```
Then import in `home-manager/common.nix` or platform-specific file.
## Agenix Secret Pattern
```nix
# 1. Add to secrets/secrets.nix
"secrets/hosts/<host>/<name>.age".publicKeys = keys.<host>;
# 2. Declare in host config
age.secrets."<name>" = {
file = ../../secrets/hosts/<host>/<name>.age;
owner = "<service-user>";
mode = "0400";
};
# 3. Create the secret
agenix -e secrets/hosts/<host>/<name>.age
```
## This Repo's Systems
| Host | Platform | Notes |
|------|----------|-------|
| ninuan | macOS | Primary dev, Aerospace WM |
| ultraviolet | NixOS | Headless server |
| bluedesert | NixOS | Headless server |
| echelon | NixOS | Headless server |
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