Sample nix derivations

avro-tools.nix

with import <nixpkgs> {};


stdenv.mkDerivation rec {
  pname = "avro-tools";
  version = "1.9.2";

  src = fetchurl {
    url =
    "https://repo1.maven.org/maven2/org/apache/avro/avro-tools/${version}/${pname}-${version}.jar";
    sha256 = "169cv4fjsj69fa2s87gh1i7wk0xzh3l7sx5yyz3cgyjalg4a12n1";
  };

  dontUnpack = true;

  buildInputs = [ jre ];
  nativeBuildInputs = [ makeWrapper ];
  sourceRoot = ".";

  installPhase = ''
    mkdir -p $out/bin
    mkdir -p $out/libexec/avro-tools
    cp $src $out/libexec/avro-tools/${pname}.jar

    makeWrapper ${jre}/bin/java $out/bin/avro-tools \
    --add-flags "-jar $out/libexec/avro-tools/${pname}.jar"
  '';
}

go.nix

let
  go113Tarball = fetchTarball https://github.com/NixOS/nixpkgs/archive/6148f6360310366708dff42055a0ba0afa963101.tar.gz;
  pkgs = import <nixpkgs> {};
  goAlternate = import go113Tarball {};

  drv = pkgs.stdenv.mkDerivation rec {
    name = "env";
    env = pkgs.buildEnv { name = name; paths = buildInputs; };
    buildInputs = [
      goAlternate.go_1_13
    ];

    shellHook = ''
      # export PS1="[nix@${name}:\W]\[$(tput sgr0)\] "
      export PS1="[\[\e[32m\]nix\[\e[m\]@\[\e[31m\]${name}\[\e[m\] \[\e[36m\]\W\[\e[m\]] "
      bind '"\e\e[C": forward-word'
      bind '"\e\e[D": backward-word'
    '';
  };
in drv

ip.nix

with import <nixpkgs> {};

let
  wmiPackage = pkgs.writeShellScriptBin "whatsMyIp" ''
    ${pkgs.curl}/bin/curl -sL http://httpbin.org/get | ${pkgs.jq}/bin/jq -r '.origin'
  '';
in
stdenv.mkDerivation rec {
  name = "test-environment";
  buildInputs = [ wmiPackage];
}

jekyll.nix

// sourced from: https://nathan.gs/2019/04/19/using-jekyll-and-nix-to-blog/

with import <nixpkgs> { };

let jekyll_env = bundlerEnv rec {
    name = "jekyll_env";
    inherit ruby;
    gemfile = ./Gemfile;
    lockfile = ./Gemfile.lock;
    gemset = ./gemset.nix;
  };
in
  stdenv.mkDerivation rec {
    name = "nathan.gs";
    buildInputs = [ jekyll_env bundler ruby ];

    shellHook = ''
      exec ${jekyll_env}/bin/jekyll serve --watch
    '';
  }

python.nix

with import <nixpkgs> {};

stdenv.mkDerivation rec {
  name = "env";
  env = buildEnv { name = name; paths = buildInputs; };
  buildInputs = [
    python36
    python36Packages.virtualenv
    python36Packages.pip
  ];

  shellHook = ''
    # export PS1="[nix@${name}:\W]\[$(tput sgr0)\] "
	export PS1="[\[\e[32m\]nix\[\e[m\]@\[\e[31m\]${name}\[\e[m\] \[\e[36m\]\W\[\e[m\]] "
    bind '"\e\e[C": forward-word'
    bind '"\e\e[D": backward-word'
  '';
}