Simplify Stack usage in Nix #5486
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aryairani
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Dec 7, 2024
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ceedubs
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There were two Nixpkgs inputs, with one being used solely to get a particular version of Stack. This now “compromises” on the same release of Nixpkgs as used for Stack, but from the haskell.nix project to have a consistent package set. There are also a few other version bumps here (because once you change an uncached input, you might as well upgrade everything): - bump LTS to 22.43 (GHC 9.6.6 from 9.6.5) - bump HLS to 2.9 (this is now transitively included via the haskell.nix input) - bump hpack to 0.36.0 (this is actually the minimum bound for the version of Stack we use, so the previous setting was inconsistent)
These were out of sync with the intended version (specified in .vscode/settings.json).
Somewhat described at https://github.com/nix-systems/nix-systems This is useful for Haskell projects, because commands like ```bash nix flake show --allow-import-from-derivation ``` can often fail, complaining that it can’t find some other architecture to build on. With nix-systems, you can append `--override-input systems github:nix-systems/x86_64-linux` to the command to ensure that x86_64-linux is the only platform in play.
It is not triggering a(nother) rebuild of GHC.
This workaround required another local workaround. If you had a line like `LD_LIBRARY_PATH=` in your .envrc, it can be removed now.
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Well, this is annoying – I updated the cache, but the Ubuntu build is still failing with OOM. |
aryairani
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This was referenced Jul 2, 2025
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The particular Stack build was the only reason we had two Nixpkgs dependencies. This removes the custom stack dependency, and instead sets the versions for the haskell.nix
tools.It also bumps hpack to 0.36.0, because it turns out that’s the minimum required by our pinned version of Stack anyway.