https://github.com/rikhuijzer/cache-install

Use the GitHub Actions cache for Nix packages
https://github.com/rikhuijzer/cache-install

actions cache dependencies nix packages

Last synced: 2 days ago
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Use the GitHub Actions cache for Nix packages

• Host: GitHub
• URL: https://github.com/rikhuijzer/cache-install
• Owner: rikhuijzer
• License: mit
• Created: 2020-09-08T13:56:52.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2024-02-07T07:15:27.000Z (8 months ago)
• Last Synced: 2024-09-19T01:28:45.154Z (8 days ago)
• Topics: actions, cache, dependencies, nix, packages
• Language: Nix
• Homepage:
• Size: 2.66 MB
• Stars: 41
• Watchers: 3
• Forks: 19
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Cache install Nix packages

This actions allows caching of installations done via the [Nix package manager](https://nixos.org) to improve workflow execution time. 

[![][tests-img]][tests-url]

Installing packages via the Nix package manager is generally quite quick.

However, sometimes the packages take a long time to compile or to download from their original sources.

For example, this occurs with R packages and LaTeX which are downloaded from respectively `CRAN` and `math.utah.edu`.

This GitHub Action speeds up the installation by simply caching the Nix store and the symlinks to the packages in the store in the [GitHub Actions cache](https://github.com/actions/cache).

So, the installed packages are restored from the cache by copying back `/nix/store`, the symlinks to `/nix/store/*` and some paths for the PATH environment variable.

## Inputs

- `key` - An explicit key for restoring and saving the cache.

- `restore-keys` - An ordered list of keys to use for restoring the cache if no cache hit occurred for key.

- `nix_version` - Nix version, defaults to `nixos-unstable`.

- `nix_file` - Nix file, defaults to `default.nix`.

- `nix_install_url` - Install URL for the Nix package manager; obtain newest via https://nixos.org/nix/install.

## Outputs

- `cache-hit` - A boolean value to indicate an exact match was found for the primary key.

## Example workflow

```yml

name: latex

on: push

jobs:

  build:

    runs-on: ubuntu-latest

    steps:

    - uses: actions/checkout@v4

    - name: Cache install Nix packages

      uses: rikhuijzer/cache-install@v1

      with:

        key: nix-${{ hashFiles('mypackages.nix') }}

        nix_file: 'mypackages.nix'

    - name: Calculate some things

      run: julia -e 'using MyPackage; MyPackage.calculate()'

    - name: Build LaTeX

      run: latexmk -f -pdf example.tex

    - name: Build website

      run: hugo --gc --minify

```

where the file `mypackages.nix` contains

```nix

let

  # Pinning explicitly to 20.03.

  rev = "5272327b81ed355bbed5659b8d303cf2979b6953";

  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";

  pkgs = import nixpkgs {};

  myTex = with pkgs; texlive.combine {

    inherit (texlive) scheme-medium pdfcrop;

  };

in with pkgs; [

  hugo

  julia

  myTex

]

```

[tests-img]: https://github.com/rikhuijzer/cache-install/workflows/test/badge.svg

[tests-url]: https://github.com/rikhuijzer/cache-install/actions