如何通过Nix在nixpkgs中覆盖Haskell软件包? [英] How do I override a Haskell package in nixpkgs via Nix?
问题描述
基本上,我在用这个:
default.nix
{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc864" }:
nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./gitchapter.nix { }
gitchapter.nix
{ mkDerivation, base, directory, extra, filepath, foldl, hpack
, HUnit, mtl, optparse-applicative, pandoc-include-code, parsec
, pretty-simple, process, QuickCheck, rainbow, regex-pcre
, regex-posix, safe, stdenv, string-conversions, system-filepath
, template-haskell, text, transformers, turtle, unix
, unordered-containers
}:
mkDerivation {
pname = "gitchapter";
version = "0.1.0.0";
src = ./.;
isLibrary = false;
isExecutable = true;
libraryToolDepends = [ hpack ];
executableHaskellDepends = [
base directory extra filepath foldl HUnit mtl optparse-applicative
pandoc-include-code parsec pretty-simple process QuickCheck rainbow
regex-pcre regex-posix safe string-conversions system-filepath
template-haskell text transformers turtle unix unordered-containers
];
preConfigure = "hpack";
license = stdenv.lib.licenses.bsd3;
}
但是, pandoc-include-code
无法构建存在问题,此问题似乎已在git存储库中修复.如何覆盖包以指向git存储库或本地目录?
However there is an issue with the pandoc-include-code
failing to build, which seems to have since been fixed in the git repository. How can I override the package either to point to git repository or a local directory?
我会按照 https://nixos.org上的说明进行操作/nixos/nix-pills/nixpkgs-overriding-packages.html 还是会由于使用 nixpkgs.pkgs.haskell.packages.$ {compiler} .callPackage
函数而有所不同?
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.${compiler}.callPackage (zzzzz) { }
所以我想现在是确定现在如何覆盖该依赖关系的问题.
So it I suppose now it's a matter of determining how to override that dependency now.
推荐答案
考虑使用 haskell.packages.$ {compiler}
中的 callCabal2nix
!
它将遍历您的.cabal文件,并为该文件派生一个nix表达式(因此无需使用gitchapter.nix),然后可以使用中的
的方式类似于普通推导覆盖.然后,您可以从git获取更新的pandoc派生版本,并将其作为buildInput添加到您的覆盖表达式中. overrideCabal
函数覆盖该表达式haskell.lib
It will go through your .cabal file and generate a nix expression for a derivation from that (thus making gitchapter.nix unnecessary), which you then can override using the overrideCabal
function in haskell.lib
in a similar fashion to normal derivation overriding. You can then fetch the updated pandoc derivation from git, and add it as a buildInput in your override expression.
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