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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/148 Servers

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3 Jul 2025
@phileas:asra.grsyd installs gentoo (they/them) joined the room.18:46:50
@phileas:asra.grsyd installs gentoo (they/them) Hey there! I hope some questions are appreciated. I'm trying to bump nix-tree (after asking the developer a while back to bump in hackage https://github.com/utdemir/nix-tree/issues/114#issuecomment-2888634183 ) assuming it would get updated eventually by nixos maintainers and the file says that you should use the regenerate-hackage-packages.sh but that fails on my local machine - I'd like to get in touch with the people maintaining that and assumed there was a Haskell Matrix channel maybe (there aren't a lot of GitHub issues around Hackage/Haskell lately if I'm not mistaken). 18:51:28
@phileas:asra.grsyd installs gentoo (they/them)
➜  nixpkgs git:(master) ✗ ./maintainers/scripts/haskell/regenerate-hackage-packages.sh --do-commit

Obtaining Hackage data
Generating compiler configuration
Starting hackage2nix to regenerate pkgs/development/haskell-modules/hackage-packages.nix ...
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/webdriver-precore/0.1.0.2/webdriver-precore.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/ulid/0.3.3.0/ulid.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/tpdb/2.8.1/tpdb.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/singletons-base-code-generator/0.1/singletons-base-code-generator.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/singletons-base/3.5/singletons-base.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pty-mcp-server/0.0.4.0/pty-mcp-server.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-ui-response/0.0.3.0/pms-ui-response.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-ui-request/0.0.3.0/pms-ui-request.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-ui-notification/0.0.2.0/pms-ui-notification.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-infrastructure/0.0.4.0/pms-infrastructure.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-infra-watch/0.0.2.0/pms-infra-watch.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-infra-procspawn/0.0.1.0/pms-infra-procspawn.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-infra-cmdrun/0.0.2.0/pms-infra-cmdrun.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-domain-service/0.0.3.0/pms-domain-service.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-domain-model/0.0.4.0/pms-domain-model.cabal)
hackage2nix: user error (cannot parse cabal file /nix/store/pv9625kwkhfj0bsgqc374by44ycm88cz-unpacked-cabal-hashes/pms-application-service/0.0.4.0/pms-application-service.cabal)
hackage2nix: thread blocked indefinitely in an MVar operation

18:51:46
@phileas:asra.grsyd installs gentoo (they/them) Reading the history of this channel I can see others also ran into thread blocked indefinitely in an MVar operation. I'm not sure if it the script is fully needed getting nix-tree usable again for others :). 18:53:34

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