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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/143 Servers

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25 Apr 2026
@eldritchcookie:matrix.orgeldritchcookieI would assume the package gets into haskell-updates in the next time they regenerate hackage-packages.nix. The HACKING.md says that each member is responsible for updating the packages for a 2 week period, i assume they must always do something in that period so they probably run the scripts at least once. Assuming they always run the scripts mentioned under the second header the scripts are ran at least once per 2 weeks, further assuming no unexpected we can expect it to take at most 2 weeks for an update. these are just assumptions based on the current documentation please have a backup plan in case it takes longer. Also why is that relevant? can you apply an overlay to the package set you use? if yes i wouldn't wait and just use callHackageDirect via the self argument of the overlay14:50:30
@eldritchcookie:matrix.orgeldritchcookie
  # callHackageDirect
  #   :: { pkg :: Text, ver :: Text, sha256 :: Text }
  #   -> AttrSet
  #   -> HaskellPackage
  #
  # This function does not depend on all-cabal-hashes and therefore will work
  # for any version that has been released on hackage as opposed to only
  # versions released before whatever version of all-cabal-hashes you happen
  # to be currently using.
  callHackageDirect =
    {
      pkg,
      ver,
      sha256,
      candidate ? false,
      rev ? {
        revision = null;
        sha256 = null;
      },
    }:
    args:
    <body>
14:55:49
@alexfmpe:matrix.orgalexfmpepretty much this, though the 2 weeks is more of a rough estimate for maintainer rotation of that duty15:25:11
@alexfmpe:matrix.orgalexfmpemost of the time we bump hackage alonside a minor stackage bump15:25:47
@alexfmpe:matrix.orgalexfmpe"Current PR:" in the channel description will show the state of current bump, so you can guesstimate (2 weeks - age) for the next15:26:29
@alexfmpe:matrix.orgalexfmpein pratice it varies wildly depending on breakage, some have taken days, some have taken several weeks15:26:47
@alexfmpe:matrix.orgalexfmpeand major stackage bumps can take months until merged15:27:05
20 May 2021
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