Stackage snapshots for your Nix.

This project is part of serokell-stackage. Please, see the readme there for details.

Snapshots

Each stackage snapshot is converted into a nixpkgs overlay and then compressed individually so that you can fetch just the archive for the snapshot which you will be using saving bandwidth and time.

Output

The output of the nix expression contains the following:

• default.nix.tar.gz – default.nix in an archive suitable for fetchTarball
• default.nix.tar.gz.sha256 – hash of default.nix.tar.gz (for fetching with fetchTarball)
• sources.json – hashes of archives with individual snapshot overlays used internally by default.nix
• <snapshot-name>.tar.gz – archives with actual overlays

default.nix will fetch the right archive depending on the snapshot that you want. To do this it needs to know absolute URIs of the archives, therefore it has the baseUrl parameter and it additionally appends its own output name to it, so that multiple generations can be hosted at the same place.

Usage

• Either fetchTarball the exact snapshot overlay archive that you want (to make sure your derivation will work in a sandbox, grab the hash from sources.json)
• or fetchTarball default.nix.tar.gz (grab the hash from default.nix.tar.gz.sha256) and then use the attribute with the name of the stackage snapshot you need – it will fetch the right tarball for you.