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从 MacOS 主机进行 nix dockerTools 交叉构建期间“bash：无法执行二进制文件”

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从 MacOS 主机进行 nix dockerTools 交叉构建期间“bash：无法执行二进制文件”

2016 年精彩的博客文章描述了使用 Nix 构建最小的 Docker 镜像。下面是摘自该博客文章的一个简单示例，经过修改以支持 Nix 2.0：

{ pkgs ? import <nixpkgs> {} }:

with pkgs;
dockerTools.buildImage {
  name = "redis";
  runAsRoot = ''
    #!${stdenv.shell}
    ${dockerTools.shadowSetup}
    groupadd -r redis
    useradd -r -g redis -d /data -M redis
    mkdir /data
    chown redis:redis /data
  '';

  config = {
    Cmd = [ "${gosu.bin}/bin/gosu" "redis" "${redis}/bin/redis-server" ];
    ExposedPorts = {
      "6379/tcp" = {};
    };
    WorkingDir = "/data";
    Volumes = {
      "/data" = {};
    };
  };
}

使用nix-linuxkitbash要拥有 x86_64-linux 构建器，此操作会失败，并出现有关无法运行的可执行文件的错误：

$ nix-build -j 1 --system x86_64-linux redis-small.nix
these derivations will be built:
  /nix/store/iixmgfhsczc71484vcwqwz2nzlg0rcv1-extra-commands.sh.drv
  /nix/store/jsydsrzs7h9pfnh8m6cxaysa9bafmp2z-redis-config.json.drv
  /nix/store/csfmyw6va3b8dabshliqjkrrdr6n090w-vm-run-stage2.drv
  /nix/store/l0p201r6zjfzsznfb6ykca1l8n09lyb9-vm-run.drv
  /nix/store/s64kqfyggqm60l5j9wy6s1nz39iwkxiw-run-as-root.sh.drv
  /nix/store/zidg0xphc7yjc4n0w3k7wnifz6rlqgzh-docker-layer-redis.drv
  /nix/store/12ahsincv8igv492gzjjvw9s8aaff65i-runtime-deps.drv
  /nix/store/pyx4q2wln2shlnjdp5ng43aqd6iba80d-docker-image-redis.tar.gz.drv
building '/nix/store/jsydsrzs7h9pfnh8m6cxaysa9bafmp2z-redis-config.json.drv'...
/nix/store/6v88ick1cxnn5g91m8qrrqww0lrlr27x-bash-4.4-p23/bin/bash: /nix/store/6v88ick1cxnn5g91m8qrrqww0lrlr27x-bash-4.4-p23/bin/bash: cannot execute binary file
builder for '/nix/store/jsydsrzs7h9pfnh8m6cxaysa9bafmp2z-redis-config.json.drv' failed with exit code 126
cannot build derivation '/nix/store/pyx4q2wln2shlnjdp5ng43aqd6iba80d-docker-image-redis.tar.gz.drv': 1 dependencies couldn't be built
error: build of '/nix/store/pyx4q2wln2shlnjdp5ng43aqd6iba80d-docker-image-redis.tar.gz.drv' failed

这里的关键是/nix/store/6v88ick1cxnn5g91m8qrrqww0lrlr27x-bash-4.4-p23/bin/bash: cannot execute binary file.用file它来检查，它确实是一个 Linux ELF 二进制文件。

顺便说一句，同样的事情也发生在下面的一句话中，取自 StackOverflow 问题的答案如何使用 Nix 构建 Docker 容器？，同样使用 dockerTools：

$ nix-build -j 1 --system x86_64-linux -E 'with import <nixpkgs> {}; pkgs.dockerTools.buildImage { name = "nix-htop"; contents = pkgs.htop; config = { Cmd = [ "/bin/htop" ]; }; }'

...同样失败：

building path(s) ‘/nix/store/gz4lrsjcmxbcmdfpmazwz0wqnb5pbw8k-nix-htop-config.json’
/nix/store/nkq0n2m4shlbdvdq0qijib5zyzgmn0vq-bash-4.4-p12/bin/bash: /nix/store/nkq0n2m4shlbdvdq0qijib5zyzgmn0vq-bash-4.4-p12/bin/bash: cannot execute binary file
builder for ‘/nix/store/487mmw8kql56q7h6iq4c7hfzh4k0gv50-nix-htop-config.json.drv’ failed with exit code 126

dockerTools共同点在这里吗？

答案1

这个答案为我工作。--system x86_64-linux您可以使用--argstr system x86_64-linux像这样的 nix 表达式，而不是使用

{ system ? "x86_64-linux", pkgs ? import <nixpkgs> { inherit system; } }:
...

例如

nix-build -j 1 --argstr system x86_64-linux -E '{ system ? "x86_64-linux", pkgs ? import <nixpkgs> { inherit system; } }: pkgs.dockerTools.buildImage { name = "nix-htop"; contents = pkgs.htop; config = { Cmd = [ "/bin/htop" ]; }; }'

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