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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://haskell4nix.readthedocs.io/144 Servers

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9 Feb 2026
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10 Feb 2026
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11 Feb 2026
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13 Feb 2026
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@b:chreekat.netchreekatas a sanity check, if a tool was introduced that created a drv for every source file of every haskell dependency of your haskell package, that would be unreasonable, right? Way too many drvs?15:04:19
@maralorn:maralorn.demaralornNot necessarily. Probably? Eval times might be horrendous. But I wouldn't bet on that. The question is usually what this drvs do and for many usecases, like e.g. compiling the overhead per drv makes it very slow.15:09:47
@b:chreekat.netchreekatinterestin15:11:09
@b:chreekat.netchreekat* interesting15:11:12
@b:chreekat.netchreekatcontext is that i'm experimenting with using casa as a source for package sources. Right now, the tool fetches tree manifests and blobs from casa and assembles them into a package source tree that can be built in a later step15:12:04
@b:chreekat.netchreekatusing IFD it's unusable, but the goal is to try using dynamic derivations / rfc9215:12:38
@b:chreekat.netchreekat(pre-generation would be another option)15:13:27
@maralorn:maralorn.demaralornI have optimised our work CI by making on hlint/ormulo check derivation per file. Without caching it is a bit slower but once the store is populated the speedup is significant.15:14:01
@maralorn:maralorn.demaralorn * 15:14:28
@toonn:matrix.orgtoonn chreekat: Isn't that what haskell.nix does? 15:16:18
@b:chreekat.netchreekatit doesn't use casa as far as I know.15:21:33
@toonn:matrix.orgtoonn No, re drv per Cabal component. Though that's not exactly what you said, I suppose. 15:22:20
@maralorn:maralorn.demaralornPer Cabal component and per source file is a big difference15:23:14
@b:chreekat.netchreekatYeah, and ironically per-component builds aren't my goal right now. My main goals are to make a tool that lets stack.yaml(.lock) be the source of truth for a nix build, that is also fast. I guess using casa is an orthogonal goal, but it feels right because casa is, or could be, a better solution than the all-cabal-hashes repo15:25:07
@b:chreekat.netchreekatit was sort of the next generation of "better interface to hackage" that fp complete was experimenting with. stack uses it, but besides that it sort of got trapped in amber as fpco moved away from haskell15:25:59

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