nix - SKILL.md Agent Skill

name: nix description: | Nix commands and package management guide. Use when: - Running nix build, nix run - Adding custom packages - Using nurl for hash acquisition

Guide Nix commands, package management, and hash acquisition workflows. Always use `--no-link` option with `nix build` to prevent `./result` symlink creation See CONTRIBUTING.md section 1.4.2 for adding new custom packages Add `doCheck = false;` if tests fail during package build Building Nix packages nix build .#rumdl --no-link Running packages registered in packages nix run .#pike -- scan -d ./terraform Hash acquisition flow for new custom packages 1. Get `hash` using nurl: `nurl https://github.com/<owner>/<repo> <tag>` 2. Get `vendorHash`/`cargoHash` via build error (`got:` line) Generate Nix fetcher calls from repository URLs nurl https://github.com/rvben/rumdl v0.0.206 Output can be used directly in fetchFromGitHub:

fetchFromGitHub {
  owner = "rvben";
  repo = "rumdl";
  rev = "v0.0.206";
  hash = "sha256-XXX...";
}

</output_usage>
<note>For cargoHash/vendorHash, use build error method (nurl does not support these)</note>

Use `--no-link` with all `nix build` commands Running `nix build` without `--no-link` (creates unwanted `./result` symlink)