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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.org143 Servers

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10 Oct 2025
@robert:funklause.dedotlambda joined the room.21:10:44
@robert:funklause.dedotlambda Where does haskellPackages.hledger_1_50 come from? Does stackage have two versions of hledger or do we always have the pinned or the most recent version? 21:12:09
@robert:funklause.dedotlambda Is it possible to make it use hledger-lib_1_50? 21:12:39
@maralorn:maralorn.demaralorn dotlambda: https://nixos.org/manual/nixpkgs/unstable/#haskell-available-versions 21:15:14
@robert:funklause.dedotlambdaIf I make a PR removing the pin on hledger, which branch should I target?21:18:25
@robert:funklause.dedotlambdaI guess I can't remove it because it's pinned on stackage21:24:06
@robert:funklause.dedotlambda
In reply to @robert:funklause.de
Is it possible to make it use hledger-lib_1_50?
Still, this would be nice in order to unbreak hledger_1_50
21:24:41
@maralorn:maralorn.demaralorn dotlambda: compare: https://github.com/NixOS/nixpkgs/issues/190542 21:24:49
@maralorn:maralorn.demaralornAre you currently trying to fix a build error?21:25:08
@maralorn:maralorn.demaralornI am slightly confused about the problem.21:25:17
@robert:funklause.dedotlambda
In reply to @maralorn:maralorn.de
Are you currently trying to fix a build error?
Yes. Try building haskellPackages.hledger_1_50. It fails because it needs hledger-lib_1_50.
21:26:22
@maralorn:maralorn.demaralornYeah, makes sense.21:26:37
@maralorn:maralorn.demaralornYeah, you would need to manually override hledger to use the correct hledger-lib version. Belongs into configuration-common.nix. Would be fine to open against master.21:27:40
@maralorn:maralorn.demaralornAlternatively you remove the stackage pinning from hledger. Which by the issue I linked has been requested multiple times.21:28:13
@robert:funklause.dedotlambda
In reply to @maralorn:maralorn.de
Alternatively you remove the stackage pinning from hledger. Which by the issue I linked has been requested multiple times.
That might break something that depends on hledger, not sure
21:28:53
@maralorn:maralorn.demaralornYeah, totally.21:29:19
@maralorn:maralorn.demaralornJust a suggestion. Do whatever you prefer.21:30:24
@robert:funklause.dedotlambdaHow would I remove the pinning?21:33:33
@robert:funklause.dedotlambda I guess I add it to update-stackage.sh 21:33:58
@maralorn:maralorn.demaralornYes, exactly.21:34:42
@maralorn:maralorn.demaralornIf you do that on master you probably want to remove the relevant pins from our stackage.yaml. But I didn’t mean to trick you into doing more work than you set out for. 😄21:36:16
@maralorn:maralorn.demaralorn(Or alas, I totally did but now I feel bad about it.)21:36:32
@robert:funklause.dedotlambdaI'll first take the easy way. And try the harder one later, when I feel like running nixpkgs-review etc21:37:09
11 Oct 2025
@collinarnett:matrix.orgCollin Arnett Does overrideSrc include new data-files? I'm getting a "No such file or directory" when I try and override based on a fork I'm working on. 17:23:37
@sternenseemann:systemli.orgsterni (he/him)Nix does not need to know about data files specifically, so shouldn't make a difference18:13:12
12 Oct 2025
@collinarnett:matrix.orgCollin ArnettAh yeah I just needed to do a cabal clean. Thanks for confirming 🙂04:49:44
@b:chreekat.netchreekatSeems buggy on cabal's side08:13:51
@b:chreekat.netchreekatInputs changed, build should have been invalidated...08:14:16
@lep-:matrix.orglep joined the room.09:27:30
@collinarnett:matrix.orgCollin ArnettYeah that's why I was pulling my hair out so much! I saw the rebuild happen on the nix side and I assumed everything would be good from there after another cabal recompile. 16:59:09

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