如何使用具有本机扩展的Nix构建Ruby Gem

我正在尝试为

rails

构建一个

bundlerEnv

。不知何故，Nix知道

nokogiri

（rails的依赖项）需要

zlib

、

libxml2

和

libxslt

，但编译失败

#Gemfile
gem "rails"

---

---

不幸的是，运行

find/nix-name mkmf.log

失败。但是使用Nix环境手动配置nokogiri成功（）

我很幸运有这样的配置：

with import <nixpkgs>{};

let
  bundler_ = bundler.override {
    ruby = ruby_2_3;
  };
  bundix_ = bundix.override {
    bundler = bundler_;
};

  gems = bundlerEnv {
    name = "company-bundler";
    inherit ruby_2_3;
    gemfile = ./Gemfile;
    lockfile = ./Gemfile.lock;
    gemset = ./gemset.nix;
  };

in

stdenv.mkDerivation rec {
  name = "company-tools";
  version = "0.1.0";
  buildInputs = [
    # Ruby
    ruby_2_3
    bundler_
    bundix_
    rake
    gems

    # Nokogiri
    libiconv
    libxml2
    libxslt
    zlib
    ];

    shellHook = ''
      # use a Gem directory within nix
      export GEM_HOME=$out/.gems
      export PATH=$out/.gems/bin:$PATH

      # For nokogiri
      export XSLT_LIB=${stdenv.lib.makeLibraryPath [ libxslt ]}
      bundle config build.nokogigi --with-xslt-lib=$XSLT_LIB
    '';
    }

与导入{}；
让
bundler=bundler.override{
ruby=ruby_2_3；
};
bundix=bundix.override{
捆扎机=捆扎机；
};
gems=bundlerEnv{
name=“公司捆绑机”；
继承ruby_2_3；
gemfile=./gemfile；
lockfile=./Gemfile.lock；
gemset=./gemset.nix；
};
在里面
stdenv.mkrec{
name=“公司工具”；
version=“0.1.0”；
构建输入=[
#红宝石
ruby_2_3
捆扎机_
邦迪克斯_
耙
宝石
#诺科吉里
它本身
libxml2
libxslt
兹利布
];
壳钩=“”
#在nix中使用Gem目录
导出GEM_HOME=$out/.gems
导出路径=$out/.gems/bin:$PATH
#为nokogiri
导出XSLT_LIB=${stdenv.LIB.makeLibraryPath[libxslt]}
bundle config build.nokogigi——使用xslt lib=$xslt_lib
'';
}

---

我认为关键点是

XSLT_LIB

var和

bundle config

bit

——它们基本上都在做同样的事情，但显然没有这个问题。将

nokogiri

从1.6.8降级到1.6.7解决了这个问题。

$ nix-build
...
buildFlags: --use-system-libraries --with-zlib-dir=/nix/store/dn9l2kd6ai731k34pzlzr5dz3in0rn31-zlib-1.2.8-dev --with-xml2-lib=/nix/store/9w15hz68wz5qnihfhsbr281d0sfs20a8-libxml2-2.9.3/lib --with-xml2-include=/nix/store/rq94vzxa92p30prfgv9jz83xiy8hkn2k-libxml2-2.9.3-dev/include/libxml2 --with-xslt-lib=/nix/store/fv137j5wxp4dg1wjqdbk8i2l087163b7-libxslt-1.1.28/lib --with-xslt-include=/nix/store/j7y29aggnzmlgh5bccp9f7vmiknh16fm-libxslt-1.1.28-dev/include --with-exslt-lib=/nix/store/fv137j5wxp4dg1wjqdbk8i2l087163b7-libxslt-1.1.28/lib --with-exslt-include=/nix/store/j7y29aggnzmlgh5bccp9f7vmiknh16fm-libxslt-1.1.28-dev/include
WARNING:  You build with buildroot.
  Build root: /
  Bin dir: /nix/store/z26mymfryhqqh7y8w94qr0xc88q46dvr-ruby2.3.1-p0-nokogiri-1.6.8/lib/ruby/gems/2.3.1/bin
  Gem home: /nix/store/z26mymfryhqqh7y8w94qr0xc88q46dvr-ruby2.3.1-p0-nokogiri-1.6.8/lib/ruby/gems/2.3.1

...
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

with import <nixpkgs>{};

let
  bundler_ = bundler.override {
    ruby = ruby_2_3;
  };
  bundix_ = bundix.override {
    bundler = bundler_;
};

  gems = bundlerEnv {
    name = "company-bundler";
    inherit ruby_2_3;
    gemfile = ./Gemfile;
    lockfile = ./Gemfile.lock;
    gemset = ./gemset.nix;
  };

in

stdenv.mkDerivation rec {
  name = "company-tools";
  version = "0.1.0";
  buildInputs = [
    # Ruby
    ruby_2_3
    bundler_
    bundix_
    rake
    gems

    # Nokogiri
    libiconv
    libxml2
    libxslt
    zlib
    ];

    shellHook = ''
      # use a Gem directory within nix
      export GEM_HOME=$out/.gems
      export PATH=$out/.gems/bin:$PATH

      # For nokogiri
      export XSLT_LIB=${stdenv.lib.makeLibraryPath [ libxslt ]}
      bundle config build.nokogigi --with-xslt-lib=$XSLT_LIB
    '';
    }