nix-actions-cache

nix-actions-cache is a minimal Nix Binary Cache server backed by the GitHub Actions Cache. It can be compiled into a ~3.5MB static binary for distribution, allowing it to start prefetching NARs used in a previous run even before Nix is installed (not implemented yet).

Development

This project depends on internal APIs used by the GitHub Actions Cache. See gha-cache/README.md for more details on how to obtain the required tokens.

cargo run -- -c creds.json
cargo build --release --target x86_64-unknown-linux-musl
cargo build --release --target aarch64-unknown-linux-musl
nix copy --to 'http://127.0.0.1:3000' $(which bash)
nix-store --store $PWD/test-root --extra-substituters 'http://localhost:3000' --option require-sigs false -r $(which bash)

TODO

• Make a GitHub Action and dogfood
• Parallelize upload
• Make sure that the corresponding NAR exists before returning .narinfo request
• Keep in-memory cache of what's present
• Record what's accessed
• Prefetch previously-accessed NARs