{ config, pkgs, ... }:
let
  buildBinPackage = options: pkgs.stdenv.mkDerivation {
    inherit (options) pname version;
    src = pkgs.fetchurl {
      inherit (options) url sha256;
    };
    unpackPhase = if options ? "binPath" then "unpackFile $src" else ":";
    installPhase = let
      binPath = if options ? "binPath" then options.binPath else "$src";
      completionCommands = if options ? hasCompletion then ''
        $out/bin/${options.pname} completion bash > $out/share/bash-completion/completions/${options.pname}
        $out/bin/${options.pname} completion zsh > $out/share/zsh/site-functions/_${options.pname}
      '' else "";
    in ''
      mkdir -p $out/bin $out/share/bash-completion/completions $out/share/zsh/site-functions
      cp ${binPath} $out/bin/${options.pname}
      chmod +x $out/bin/${options.pname}
      ${completionCommands}
    '';
  };

  argocd = buildBinPackage rec {
    pname = "argocd";
    version = "1.3.0";
    url = "https://github.com/argoproj/argo-cd/releases/download/v${version}/argocd-linux-amd64";
    sha256 = "1mspgjipalngbjl9rdi2pyvq3g8nh4w2sq5isz87l7fkj4cy4qvk";
    hasCompletion = true;
  };
  helm = buildBinPackage rec {
    pname = "helm";
    version = "3.0.0";
    url = "https://get.helm.sh/helm-v${version}-linux-amd64.tar.gz";
    sha256 = "10e1fdcca263062b1d7b2cb93a924be1ef3dd6c381263d8151dd1a20a3d8c0dc";
    binPath = "linux-amd64/helm";
    hasCompletion = true;
  };
  eksctl = buildBinPackage rec {
    pname = "eksctl";
    version = "0.10.2";
    url = "https://github.com/weaveworks/eksctl/releases/download/${version}/eksctl_Linux_amd64.tar.gz";
    sha256 = "d3e70cd101ca4756ca9b2fbbeb6edcf580ae4783d80004c8847fa177e7d32e03";
    binPath = "eksctl";
    hasCompletion = true;
  };
  k9s = buildBinPackage rec {
    pname = "k9s";
    version = "0.9.3";
    url = "https://github.com/derailed/k9s/releases/download/${version}/k9s_${version}_Linux_x86_64.tar.gz";
    sha256 = "af3608517684e59de94573ad123486edd6f392c8c319ddbde6223d3ac2d37bd9";
    binPath = "k9s";
  };
  kustomize = buildBinPackage rec {
    pname = "kustomize";
    version = "3.2.1";
    url = "https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize/v${version}/kustomize_kustomize.v${version}_linux_amd64";
    sha256 = "a91b38778945e8a63fe70bc7522703a94c1d572d5dcee245e96647359e1fd04b";
  };
in {
  environment.systemPackages = with pkgs; [
    kubectl
    kubectx
    kops
    argocd
    helm
    eksctl
    k9s
    kustomize
    aws-iam-authenticator
  ];
}