install-nix-action

Installs Nix on GitHub Actions for the supported platforms: Linux and macOS.

By default it has no nixpkgs configured, you have to set nix_path by picking a channel or pin nixpkgs yourself (see also pinning tutorial).

Features

Quick installation (~4s on Linux, ~20s on macOS)
Multi-User installation (with sandboxing enabled only on Linux)
Self-hosted github runner support
Allows specifying Nix installation URL via install_url
Allows specifying extra Nix configration options via extra_nix_config
Allows specifying $NIX_PATH and channels via nix_path

Usage

Create .github/workflows/test.yml in your repo with the following contents:

name: "Test"
on:
  pull_request:
  push:
jobs:
  tests:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: cachix/install-nix-action@v11
      with:
        nix_path: nixpkgs=channel:nixos-unstable
    - run: nix-build

See also cachix-action for simple binary cache setup to speed up your builds and share binaries with developers.

Usage with Flakes

name: "Test"
on:
  pull_request:
  push:
jobs:
  tests:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
      with:
          # Nix Flakes doesn't work on shallow clones
          fetch-depth: 0
    - uses: cachix/install-nix-action@v11
      with:
        install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20201007_5257a25/install
        extra_nix_config: |
          experimental-features = nix-command flakes          
    - run: nix-build

Inputs (specify using `with:`)

install_url: specify URL to install Nix from (useful for testing non-stable releases or pinning Nix for example https://releases.nixos.org/nix/nix-2.3.7/install)
nix_path: set NIX_PATH environment variable, for example nixpkgs=channel:nixos-unstable
extra_nix_config: append to /etc/nix/nix.conf

FAQ

Is it possible to run NixOS tests / Qemu+KVM with GitHub Actions?

Currently GitHub Actions are not running on Azure instance types that support nested virtualization.

How do I print nixpkgs version with the channel I have configured?

nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'

Hacking

Install the dependencies

$ yarn install

Build the typescript

$ yarn build

Run the tests ✔️

$ yarn test

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