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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.org149 Servers

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12 Sep 2025
@maralorn:maralorn.demaralornIf you have to do that then you need to understand why configure is pulling two different version of hackage-security in.08:29:11
@bglgwyng:matrix.orgbglgwyngYes I agree08:29:54
@maralorn:maralorn.demaralornThere is one other possibility. 1. Only override hackage-security on your project not on the whole dependency closure. 2. Enable "allowInconsistentDependencies". 3. Hope that the types from the two different hackage-security versions never meet during compilation. However last time I tried something like this I failed. So it’s probably not a good idea.08:31:25
@bglgwyng:matrix.orgbglgwyngHmm I'm trying haskell.nix now. Actually, I should build my package to bootstrap things, so that how to build it not important.08:33:10
@bglgwyng:matrix.orgbglgwyngWait for minutes please.08:33:17
@bglgwyng:matrix.orgbglgwyng* Hmm I'm trying haskell.nix now. Actually, I should build my package to bootstrap things, so that how to build it is not important.08:33:34
@maralorn:maralorn.demaralornBest explanation I can think of is that there is a dependency chain cabal-install -> X -> hackage-security, where X is a core package distributed with ghc. Then X would not be affected by the overrideScope and thus use the wrong hackage-security. But this is close to where I normally give up …08:34:07
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️ The maintainer scripts maintainers/scripts/haskell/ seem broken, I get this error with multiple scripts: error: access to absolute path '/home/myusername/.local' is forbidden in restricted mode 13:08:51
@maralorn:maralorn.demaralornOverriding core adjacent packages is just a pain and actually the one time where I switched to haskell.nix …08:34:42
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️ ./maintainers/scripts/haskell/regenerate-hackage-packages.sh --fast goes through, but without --fast I get the above error 13:11:37
@aidalgol:tchncs.de@aidalgol:tchncs.de set a profile picture.09:21:40
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️ Same seems to happen with maintainers/scripts/haskell/regenerate-transitive-broken-packages.sh 13:11:56
@sternenseemann:systemli.orgsterni (he/him)okay I fell down one or two rabbit holes16:03:07
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️ Actually I think it happens while regenerate-hackage-packages.sh calls regenerate-transitive-broken-packages.sh 13:14:27
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️ https://github.com/NixOS/nixpkgs/issues/400784 I see there's this issue which was closed by sterni last week, I was able to reproduce it :D I have nix (Nix) 2.28.4 14:08:19
@oak:universumi.fioak πŸ³οΈβ€πŸŒˆβ™₯️ * https://github.com/NixOS/nixpkgs/issues/400784 I see there's this issue which was opened by sterni which was closed last week, I was able to reproduce it :D I have nix (Nix) 2.28.4. I'm trying to update to 2.28.5 which seems to be the latest on stable 14:11:55

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