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nix-gitlab-ci/docs/caching.md
technofab cf80010d07 docs: write docs & improve tooling 
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commit 86eadd3ec42b7bce0dc5716d65798af95d0d8cbc
Author: technofab <admin@technofab.de>
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Author: technofab <admin@technofab.de>
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docs: write docs and improve formatter etc.

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Author: technofab <admin@technofab.de>
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docs: initial setup
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Caching

Nix GitLab CI supports several caching mechanisms to speed up your pipelines.

GitLab Runner Cache

The runner cache strategy copies the new store paths into a directory .nix-cache, which is then saved in the regular GitLab cache (technically runner cache). It's also configured as a substituter automatically.

To enable, set the cache strategy to runner.

Configure it using these environment variables:

  • RUNNER_CACHE: path to the runner cache (default .nix-cache)

!!! warning

This is very inefficient and should probably only be used for very very small
dependency counts. Otherwise it takes an eternity to save to cache.

Cachix

Cachix is a hosted binary cache service that can significantly speed up Nix builds by sharing build results.

To enable, set the cache strategy to attic.

Configure it using these environment variables:

  • CACHIX_CACHE: name of the cache to use
  • (CACHIX_AUTH_TOKEN): cachix client itself uses this for authentication

!!! warning

Cachix has not been tested. Feedback is appreciated :)

Attic (Self-Hosted Cache)

Attic is a self-hosted, deduplicating binary cache. It's a great option if you want more control over your caching infrastructure and to have the cache closer to your runners.

To enable, set the cache strategy to attic.

Configure it using these environment variables:

  • ATTIC_SERVER: URL of the server
  • ATTIC_CACHE: name of the cache to use
  • ATTIC_TOKEN: auth token from the attic server