如何使用Nix用git/local包覆盖Haskell包? [英] How do I override a Haskell package with a git / local package with Nix?

问题描述

基本上我正在使用这个:

Essentially I'm using this:

default.nix

{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc864" }:
nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./gitchapter.nix { }

gitchapter.nix

{ mkDerivation, base, directory, extra, filepath, foldl, hpack
, HUnit, mtl, optparse-applicative, pandoc-include-code, parsec
, pretty-simple, process, QuickCheck, rainbow, regex-pcre
, regex-posix, safe, stdenv, string-conversions, system-filepath
, template-haskell, text, transformers, turtle, unix
, unordered-containers
}:
mkDerivation {
  pname = "gitchapter";
  version = "0.1.0.0";
  src = ./.;
  isLibrary = false;
  isExecutable = true;
  libraryToolDepends = [ hpack ];
  executableHaskellDepends = [
    base directory extra filepath foldl HUnit mtl optparse-applicative
    pandoc-include-code parsec pretty-simple process QuickCheck rainbow
    regex-pcre regex-posix safe string-conversions system-filepath
    template-haskell text transformers turtle unix unordered-containers
  ];
  preConfigure = "hpack";
  license = stdenv.lib.licenses.bsd3;
}

但是，pandoc-include-code无法构建存在问题，此问题似乎已在git存储库中修复.如何覆盖包以指向git存储库或本地目录?

However there is an issue with the pandoc-include-code failing to build, which seems to have since been fixed in the git repository. How can I override the package either to point to git repository or a local directory?

我是否会按照 https://nixos.org上的说明进行操作/nixos/nix-pills/nixpkgs-overriding-packages.html 还是由于使用nixpkgs.pkgs.haskell.packages.${compiler}.callPackage函数而导致工作原理不同?

Would I follow the instructions at https://nixos.org/nixos/nix-pills/nixpkgs-overriding-packages.html or would this work differently due to using the nixpkgs.pkgs.haskell.packages.${compiler}.callPackage function?

修改: 感谢@sara的回答，我现在有了:

Thanks to @sara's answer I now have:

{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc864" } :
let
  gitchapter = nixpkgs.pkgs.haskell.packages.${compiler}.callCabal2nix "gitchaper" (./.) {};
  zzzzz = nixpkgs.pkgs.haskell.lib.overrideCabal gitchapter;
in
  nixpkgs.pkgs.haskell.packages.${compiler}.callPackage (zzzzz) { }

所以我想现在是确定现在如何覆盖该依赖关系的问题.

So it I suppose now it's a matter of determining how to override that dependency now.

推荐答案

我将要覆盖的存储库克隆到pandoc-include-code/中，然后:

I cloned the repository I wanted to override into pandoc-include-code/ and then:

{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc864" } :
let
  myHaskellPackages = nixpkgs.pkgs.haskell.packages.${compiler}.override {
    overrides = self: super: rec {
    pandoc-include-code  = self.callCabal2nix "pandoc-include-code" (./pandoc-include-code) {};
    };
  };
in
  myHaskellPackages.callCabal2nix "gitchaper" (./.) {}

---

要直接引用git存储库:

---

For referencing the git repository directly:

{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc864" } :
let
  myHaskellPackages = nixpkgs.pkgs.haskell.packages.${compiler}.override {
    overrides = self: super: rec {
    pandoc-include-code  = self.callCabal2nix "pandoc-include-code" (builtins.fetchGit {
        url = "[e-mail]:owickstrom/pandoc-include-code.git";
        rev = "3afe94299b3a473fda0c62fdfd318435117751dd";
      })
      {};
    };
  };
in
  myHaskellPackages.callCabal2nix "gitchaper" (./.) {}

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