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Charles Duffy's questions

Martin Hope
Charles Duffy
Asked: 2018-09-21 15:51:33 +0800 CST
  • 3

一篇很棒的 2016 年博客文章描述了使用 Nix 构建最小的 Docker 镜像。下面是取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" = {};
    };
  };
}

使用有一个 x86_64-linux 构建器，这将失败，并出现有关无法运行nix-linuxkit的可执行文件的错误：bash

$ 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. 使用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单行代码中，取自对 StackOverflow 问题How to build a Docker container with Nix?的回答。，也使用 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？

nix