Question

当我使用dockerTools.buildImage

时，我希望保留this variables

$ docker run -it lnl7/nix:latest env
PATH=/root/.nix-profile/bin:/run/current-system/sw/bin
HOSTNAME=52be36e10f96
TERM=xterm
MANPATH=/root/.nix-profile/share/man:/run/current-system/sw/share/man
NIX_PATH=nixpkgs=/nix/store/d7r0qlms9w7k0m5kmvinp52abxbncafv-nixpkgs-unstable-2018-01-13
GIT_SSL_CAINFO=/nix/store/dblcx21khkizv3h9n0haqbkmzig3n3wd-nss-cacert-3.33/etc/ssl/certs/ca-bundle.crt
SSL_CERT_FILE=/nix/store/dblcx21khkizv3h9n0haqbkmzig3n3wd-nss-cacert-3.33/etc/ssl/certs/ca-bundle.crt
HOME=/root

但是使用这个

$ cat runner/nixops_runner.nix
{ pkgs ? import <nixpkgs> {} }:

with pkgs;

let
  workdir = "/app";

  sshConfig = writeText "ssh_config" ''
    Host *
    StrictHostKeyChecking=no
    UserKnownHostsFile /dev/null
    IdentityFile /ssh/id_rsa
  '';

  nixFromDockerHub = dockerTools.pullImage {
    imageName = "lnl7/nix";
    imageTag = "latest";

    # this hash will need change if the tag is updated at docker hub
    sha256 = "031xba6yi72v87v560wqbcsi80hqbwx498qz5b5jxigj36yb3k36";
  };
in

dockerTools.buildImage {
  name = "nixops_runner";

  fromImage = nixFromDockerHub;
}

我明白了

$ docker load --input $(nix-build runner/nixops_runner.nix --no-out-link) && docker run -it nixops_runner env
Loaded image: nixops_runner:latest
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=9d673e788746
TERM=xterm
HOME=/root

如何保留图像的环境变量？

Answer 1

这些函数在低抽象级别（几乎没有）工作。模拟docker构建语义似乎不是一个目标。另请注意API将发生变化的警告。

如果您知道图片环境中的内容，可以手动为buildImage指定。不支持从图层继承环境变量（截至2018年5月）。

pkgs.dockerTools.buildImage {
  name = "nixops_runner";
  config = {
    Env = [ "PATH=/bin" "TZDIR=${pkgs.tzdata}/share/zoneinfo" ];
    Cmd = "/some/path/bin/my-script";
  };
}

dockerTools.buildImage删除fromImage图像的环境变量，如何保存Env？

1 个答案: