Installs Nix on Gitea Actions

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zimbatm 334bb6100b idempotent installation Don't run the installer if Nix has already been installed on the host. We assume that the installed Nix is already in the desired state. This allows to share a given pipeline between hosted and self-hosted runners. Usually the self-hosted runners are long-lived and already have Nix installed.		2020-11-02 12:35:41 +01:00
__tests__	Initial commit	2019-10-02 11:52:32 +02:00
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action.yml	Support self-hosted runners and always skip adding a channel	2020-09-21 14:16:30 +02:00
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shell.nix	add shell.nix for easier development	2019-11-07 10:19:07 +01:00
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README.md

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-3.0pre20200820_4d77513/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