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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/140 Servers

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28 Nov 2025
@ghpzin:envs.netghpzin You might disable documentation.doc.enable, if you do not want to pull them for any package. 16:25:51
@ghpzin:envs.netghpzin You might disable documentation.doc.enable, if you do not want to pull them for any package in environment.systemPackages 16:26:06
@acidbong:envs.net@acidbong:envs.net the way to reproduce is to have environment.systemPackages = [pkgs.cachix]; 16:27:44
@acidbong:envs.net@acidbong:envs.net it does help, but I want to have doc output from other packages 16:28:24
@acidbong:envs.net@acidbong:envs.net* it does help, but I want to have doc output from other packages, so not perfect16:28:31
@me:linj.techlinjinteresting, let me try16:28:58
@acidbong:envs.net@acidbong:envs.net it'll start like this:
these 279 paths will be fetched (160.57 MiB download, 1693.50 MiB unpacked):
  /nix/store/i6kmc2cg12acc5kx55vpkxwb1a07a17s-Diff-1.0.2-doc
  /nix/store/1aqpij0r645krf360sp91755gbr23g6k-OneTuple-0.4.2-doc
  /nix/store/nfnj3wiv2hmiybkywz72749b7vy17hpj-QuickCheck-2.15.0.1-doc
  /nix/store/19yjvfpkjxxcvi8kyvj21wk8qlf1qfy9-SHA-1.6.4.4-doc
  /nix/store/lr0vzbpjqzxli3i255y6rxxmihh75ljx-StateVar-1.2.2-doc
  /nix/store/0y1dvczs1hhnhq21fhx6gpv8jdswxcd3-adjunctions-4.4.3-doc
  /nix/store/qi4r1j0mf1qrfxkzgdcd402gkm8g1dz5-aeson-2.2.3.0-doc
  /nix/store/91hz94r3z28al926pj1z49nwd3a7l7xk-aeson-pretty-0.8.10-doc
  /nix/store/1qzz56rc62qbcaz6735nfrz68llmzmn9-algebraic-graphs-0.7-doc
  /nix/store/njypyw5wkzqjz8yg5h5jsc7fprhjacfq-amazonka-2.0-unstable-2025-04-16-doc
  /nix/store/mhr4sj0rv8amf2df1bqa1p23r2zxwa4v-amazonka-core-2.0-unstable-2025-04-16-doc
...
16:31:40
@acidbong:envs.net@acidbong:envs.net actually, this seems more like a buildEnv issue than Haskell (it's just only Haskell that has doc outputs for every library out there) 16:35:47
@me:linj.techlinj Acid Bong: Yeah, you are right. 17:05:07
@me:linj.techlinj Maybe we should add a variant of cachix that uses justStaticExecutables instead of enableSeparateBinOutput 17:05:47
@acidbong:envs.net@acidbong:envs.neti seem to be not alone in this: https://github.com/NixOS/nixpkgs/issues/31676817:07:32
@acidbong:envs.net@acidbong:envs.net maybe do that for all top-level standalone haskell packages? 17:07:58
@acidbong:envs.net@acidbong:envs.netalthough Nixfmt is fine already17:09:12
@me:linj.techlinj No, I do not think they are the same issue. Actually, from a certain perspective,
your "issue" is not an issue. It works as expected: you have documentation.doc.enable = true so cachix doc is pulled in
17:10:44
@me:linj.techlinj because it uses justStaticExecutables already 17:11:39
@acidbong:envs.net@acidbong:envs.net not cachix's doc, but all its dependencies' docs 17:12:27
@acidbong:envs.net@acidbong:envs.net* not only cachix's doc, but all its dependencies' docs17:12:37
@acidbong:envs.net@acidbong:envs.netand the second part is exactly undesirable17:12:48
@me:linj.techlinjhaha, its doc depends on its dependencies' doc17:15:01
@me:linj.techlinjYou can go to its dependencies' doc by clicking hyperlinks from its doc17:16:39
@acidbong:envs.net@acidbong:envs.netah, I thought buildEnv pulls docs recursively17:16:41
@me:linj.techlinjIt's a feature!17:16:44
29 Nov 2025
@maralorn:maralorn.demaralorn

linj: re: justStaticExecutables. This is interesting. I have been advocating to replace justStaticExecutables with enableSeparateBinOutput because I was not aware of any downsides of the later (when it works. It can cause build errors because of problems with cabal). And I always found it more elegant to reuse the library output instead of just deleting it.

No I am wondering whether that was a bad direction.

00:09:44
@maralorn:maralorn.demaralorn *

linj: re: justStaticExecutables. This is interesting. I have been advocating to replace justStaticExecutables with enableSeparateBinOutput because I was not aware of any downsides of the later (when it works. It can cause build errors because of problems with cabal). And I always found it more elegant to reuse the library output instead of just deleting it.

Now I am wondering whether that was a bad direction.

00:09:49
@maralorn:maralorn.demaralornIt is also kinda doubtful that the library docs of cachix are actually usefull docs for users of the executable.00:10:33
@acidbong:envs.net@acidbong:envs.net
In reply to @maralorn:maralorn.de
It is also kinda doubtful that the library docs of cachix are actually usefull docs for users of the executable.
yeah, cuz if they want Cachix the library, they can get haskellPackages.cachix (or shellFor {packages = h: [h.cachix];})
05:27:15
@sternenseemann:systemli.orgsterni (he/him) Wolfgang Walther: I could make a cabal2nix release for the next iteration, so end users on stable cabal2nix can benefit from _type etc. Not a big priority since it's somewhat fringe, but would be good to do eventually 14:46:16
@wolfgangwalther:matrix.orgWolfgang WaltherNo objections!18:03:35
@sellout:matrix.orgsellout I’m having an issue with using a cabal-version other than the one included with GHC. There is a Cabal bug that was fixed in 3.10.3. I updated my Cabal files to include cabal-version: 3.10.3, but my packages support back to GHC 9.6.1 (and the first with Cabal 3.10.3 is GHC 9.8.3). I’ve tried overriding Cabal/Cabal-syntax/cabal-install for GHCs older than 9.8.3, but I still get the complaint “Unsupported cabal-version 3.10.3.” Interestingly, the workaround I managed to find is if I override Cabal to 3.10.3.0, but let cabal-version be set to something older, it works. Maybe this is actually the correct thing – the Cabal file can be parsed with an older Cabal, but Setup requires the non-broken one? 18:12:15
@acidbong:envs.net@acidbong:envs.net yup, that works, opened 466253 18:19:51

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