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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/ | More Nix: #community:nixos.org | More Haskell: #haskell-space:matrix.org146 Servers

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19 Jan 2025
@kenran_:matrix.orgkenran_ * I've updated the hscurses library a little bit; in particular its new version would no longer need the line hscurses = addExtraLibrary pkgs.ncurses super.hscurses; in configuration-nix.nix (but would need to inherit ncurses from pkgs instead in the mkDerivation call in hackage-packages.nix instead in order to not pull in the Haskell lib named ncurses). Is the version update + the latter step something that's automagically made somehow? Or would that need a PR somewhere? (My guess would be that changing configuration-nix.nix is a manual step?) 13:54:12
@cdepillabout:matrix.orgcdepillabout Changes in configuration-nix.nix and configuration-common.nix are always manual steps. However the version updates are automatic. It happens about once every two weeks on the haskell-updates branch in Nixpkgs. (Although now its more like once a month or so?) Here's an example PR where you can see the version updates happen: https://github.com/NixOS/nixpkgs/pull/371032 14:03:26
@kenran_:matrix.orgkenran_ Cool, thanks! If I (or you) would want to make the above changes after the update to hscurses is through (and the package is then presumably marked broken), we'd then have to PR to haskell-updates when a new draft PR is made? 14:07:08
@kenran_:matrix.orgkenran_ And if hackage-packages.nix is automatically generated: is that mechanism smart enough to detect that the ncurses argument is not meaning haskellPackages.ncurses, but needs to be overridden with { inherit (pkgs) ncurses: }? 14:10:08
@kenran_:matrix.orgkenran_ * And if hackage-packages.nix is automatically generated: is that mechanism smart enough to detect that the ncurses argument is not supposed to need haskellPackages.ncurses, but needs to be overridden with { inherit (pkgs) ncurses: }? 14:11:39
@sternenseemann:systemli.orgsterni (he/him) I'd recommend using haskell.lib.compose.overrideSrc since that deals with hackage revisions and allows further haskell specific overrides. 19:12:17
@aspendowntime:matrix.org@aspendowntime:matrix.org changed their display name from Nerissa (it/she) to Eden (they/it/she).23:11:22
20 Jan 2025
@lambda-mike:matrix.org@lambda-mike left the room.10:22:02
@joaomoreira:matrix.orgJoão Moreira

chreekat linj: Thanks for the hints back then. Does haskell.lib.compose.overrideCabal (as in both pretty-simple and nixfmt-rfc-style) can do the same as

haskell.packages.ghc910.callPackage and haskellPackages = haskell.packages.ghc910;?

I really need ghc910 (GHC2024).

17:19:09
@joaomoreira:matrix.orgJoão Moreira *

chreekat linj: Thanks for the hints back then. Does haskell.lib.compose.overrideCabal (as in both given derivation examples pretty-simple and nixfmt-rfc-style) can do the same as

haskell.packages.ghc910.callPackage and haskellPackages = haskell.packages.ghc910;?

I really need ghc910 (GHC2024).

17:19:41
@joaomoreira:matrix.orgJoão Moreira
In reply to @joaomoreira:matrix.org

how can I move, haskell.lib.compose.justStaticExecutables, haskell.packages.ghc910 etc from all-packages.nix to package.nix so that nixpkgs-vet job succesffully passes (i.e. fits pkgs/by-name)? I tried finding examples on nixpkgs, but they don't seem right / too complex for my derivation.

How it is now:

pkgs/top-level/all-packages.nix

  # Check kind-lang.cabal. GHC2024 >= ghc910.
  kind-lang = haskell.lib.compose.justStaticExecutables (haskell.packages.ghc910.callPackage ../by-name/ki/kind-lang/package.nix {
    haskellPackages = haskell.packages.ghc910;
  });

nixpkgs-vet error

- Because pkgs/by-name/ki/kind-lang exists, the attribute `pkgs.kind-lang` must be defined like

    kind-lang = callPackage ./../by-name/ki/kind-lang/package.nix { /* ... */ };

  However, in this PR, it isn't defined that way. See the definition in pkgs/top-level/all-packages.nix:6458

    kind-lang = haskell.lib.compose.justStaticExecutables (haskell.packages.ghc910.callPackage ../by-name/ki/kind-lang/package.nix {
      haskellPackages = haskell.packages.ghc910;
    });

This PR introduces the problems listed above. Please fix them before merging, otherwise the base branch would break.
To run locally: ./ci/nixpkgs-vet.sh master https://github.com/NixOS/nixpkgs.git
If you're having trouble, ping @NixOS/nixpkgs-vet
Error: Process completed with exit code 1.

pr https://github.com/NixOS/nixpkgs/pull/371934

for reference 		17:20:54
@joaomoreira:matrix.orgJoão Moreiraotherwise, how can I do it?17:21:59
@alexfmpe:matrix.orgalexfmpeyou can apply overrideCabal in an overlay for ghc910, just need nested //18:31:24
@alexfmpe:matrix.orgalexfmpe``` haskell = nixpkgs.haskell // { packages = nixpkgs.haskell.packages // { "${compiler}" = nixpkgs.haskell.packages.${compiler}.override(old: { overrides = self: super: { mypkg = overrideCabal super.mypkg (drv: ...) } }); }; }; }; ```18:37:05
@alexfmpe:matrix.orgalexfmpeThis sort of thjng18:37:08
@alexfmpe:matrix.orgalexfmpe* This sort of thing18:37:18
@alexfmpe:matrix.orgalexfmpe* <code> haskell = nixpkgs.haskell // { packages = nixpkgs.haskell.packages // { "${compiler}" = nixpkgs.haskell.packages.${compiler}.override(old: { overrides = self: super: { mypkg = overrideCabal super.mypkg (drv: ...) } }); }; }; }; </code> ```18:37:38
@alexfmpe:matrix.orgalexfmpe* <code> haskell = nixpkgs.haskell // { packages = nixpkgs.haskell.packages // { "${compiler}" = nixpkgs.haskell.packages.${compiler}.override(old: { overrides = self: super: { mypkg = overrideCabal super.mypkg (drv: ...) } }); }; }; }; </code>18:37:47
@alexfmpe:matrix.orgalexfmpe* ``` haskell = nixpkgs.haskell // { packages = nixpkgs.haskell.packages // { "${compiler}" = nixpkgs.haskell.packages.${compiler}.override(old: { overrides = self: super: { mypkg = overrideCabal super.mypkg (drv: ...) } }); }; }; }; ```18:38:42
@alexfmpe:matrix.orgalexfmpeIs triple back tick formatting broken for anyone else for weeks now?18:39:03
21 Jan 2025
@psibi:matrix.orgpsibi

I tried getting access to specific version of fourmolu like this:

nix shell nixpkgs#haskellPackages.fourmolu_0_16_2_0

But it results in an error. Relevant error messages:

CallStack (from HasCallStack):
withMetadata, called at libraries/Cabal/Cabal/src/Distribution/Simple/Utils.hs:368:14 in Cabal-3.10.3.0:Distribution.Simple.Utils
Error: Setup: Encountered missing or private dependencies:
Cabal-syntax >=3.12 && <3.13,
ghc-lib-parser >=9.10 && <9.11,
text >=2.1 && <3

Is that expected ? Is there any workaround for it ?

03:03:13
@magthe:tchncs.deMagnusRedacted or Malformed Event06:34:11
@cdepillabout:matrix.orgcdepillabout The _X_Y_Z versions of packages are provided by Nixpkgs as a convenience, but they often don't work. If you want to get it working, you can override the derivation and pass it the dependencies it needs. Hitting it with an .overrideScope might be the easiest if you need something deep in the dep tree and widely used. Grep through the Haskell stuff in Nixpkgs for an example. 04:26:32
@psibi:matrix.orgpsibiAh, I see. Thank you!04:27:00
@magthe:tchncs.deMagnus Building a shell with haskell-langauge-server ran out of space... explicitly setting TMPDIR to something else than /tmp solved it... apparently 16G isn't enough (or maybe I ran out of inodes, 1 million), that's a bit scary 😁 09:06:01
@b:chreekat.netchreekatExactly. Makes the result better for whom? :) Features delayed in order to please us developers is time-value lost for customers and the business. Knowing where to draw the line, knowing what tradeoffs are acceptable and when, is like any art form. A balance of compromises.11:10:30
@maralorn:maralorn.demaralornTook me a moment to realise that "business value" is not just a euphemism for greed. 😄 It’s real customers whose life we try to make better.11:36:02
@maralorn:maralorn.demaralornAnd I mean we all know the feeling of working with sucky software.11:36:33
@joelmatrixaccount:matrix.orgJoel joined the room.12:29:02
@jean-paul.:matrix.orgjean-paul.Anyone have an SBOM generator that works with nix Haskell packages? github:nixos/bundlers#toReport is about 90% of the way there but its output format is annoying and it doesn't have an option to limit the output to direct dependencies. https://github.com/tiiuae/sbomnix is much more featureful but it fails to extract the license information for 90% of Haskell packages for some reason13:12:13

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