103 lines
2.9 KiB
Markdown
103 lines
2.9 KiB
Markdown
# install-nix-action
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Installs [Nix](https://nixos.org/nix/) on GitHub Actions for the supported platforms: Linux and macOS.
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By default it has no nixpkgs configured, you have to set `nix_path`
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by [picking a channel](https://status.nixos.org/)
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or [pin nixpkgs yourself](https://nix.dev/reference/pinning-nixpkgs.html)
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(see also [pinning tutorial](https://nix.dev/tutorials/towards-reproducibility-pinning-nixpkgs.html)).
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# Features
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- Quick installation (~4s on Linux, ~20s on macOS)
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- Multi-User installation (with sandboxing enabled only on Linux)
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- [Self-hosted github runner](https://docs.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners) support
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- Allows specifying Nix installation URL via `install_url`
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- Allows specifying extra Nix configration options via `extra_nix_config`
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- Allows specifying `$NIX_PATH` and channels via `nix_path`
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- Share `/nix/store` between builds using [cachix-action](https://github.com/cachix/cachix-action) for simple binary cache setup to speed up your builds and share binaries with your team
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## Usage
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Create `.github/workflows/test.yml` in your repo with the following contents:
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```yaml
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name: "Test"
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on:
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pull_request:
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push:
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jobs:
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tests:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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- uses: cachix/install-nix-action@v11
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with:
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nix_path: nixpkgs=channel:nixos-unstable
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- run: nix-build
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```
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## Usage with Flakes
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```yaml
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name: "Test"
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on:
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pull_request:
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push:
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jobs:
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tests:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v2
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with:
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# Nix Flakes doesn't work on shallow clones
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fetch-depth: 0
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- uses: cachix/install-nix-action@v11
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with:
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install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20200820_4d77513/install
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extra_nix_config: |
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experimental-features = nix-command flakes
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- run: nix-build
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```
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## Inputs (specify using `with:`)
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- `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)
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- `nix_path`: set `NIX_PATH` environment variable, for example `nixpkgs=channel:nixos-unstable`
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- `extra_nix_config`: append to `/etc/nix/nix.conf`
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---
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## FAQ
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### Is it possible to run NixOS tests / Qemu+KVM with GitHub Actions?
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[Currently GitHub Actions are not running on Azure instance types that support nested virtualization](https://github.com/actions/virtual-environments/issues/183#issuecomment-610723516).
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### How do I print nixpkgs version with the channel I have configured?
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```nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'```
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## Hacking
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Install the dependencies
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```bash
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$ yarn install
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```
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Build the typescript
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```bash
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$ yarn build
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```
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Run the tests :heavy_check_mark:
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```bash
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$ yarn test
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```
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