Nix 錯誤：未定義的變數“goPackages”

我正在嘗試建構一個 docker 映像，如此處所述：http: //lethalman.blogspot.com/2016/04/cheap-docker-images-with-nix_15.html

預設.nix

{ pkgs ? import <nixpkgs> {} }:

with pkgs;
let
 entrypoint = writeScript "entrypoint.sh" ''
   #!${stdenv.shell}
   set -e

   # allow the container to be started with `--user`
   if [ "$1" = "redis-server" -a "$(${coreutils}/bin/id -u)" = "0" ]; then
     chown -R redis .
     exec ${goPackages.gosu.bin}/bin/gosu redis "$BASH_SOURCE" "$@"
   fi

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

 contents = [ redis ];

 config = {
   Cmd = [ "redis-server" ];
   Entrypoint = [ entrypoint ];
   ExposedPorts = {
     "6379/tcp" = {};
   };
   WorkingDir = "/data";
   Volumes = {
     "/data" = {};
   };
 };
}

但是，這會產生以下錯誤：

nix-build
error: undefined variable 'goPackages' at /home/chris/temp/nix/default.nix:12:14
(use '--show-trace' to show detailed location information)

我該如何解決這個問題？

gosu現在可在：${pkgs.gosu.bin}

換句話說，替換：

     exec ${goPackages.gosu.bin}/bin/gosu redis "$BASH_SOURCE" "$@"

和：

     exec ${pkgs.gosu.bin}/bin/gosu redis "$BASH_SOURCE" "$@"

如果有人知道發生了什麼，goPackages那將很有用。

我發布這個問題/答案是因為我認為其他人可能會遇到同樣的錯誤。

引用自：https://unix.stackexchange.com/questions/543325