pantheon: no bash update script, nixpkgs_github_update

Cuz ew. What could be more ew? Not this really.
Clearly using update-source-version (bash) from a different lang
is better? 😜️

pkgs/desktops/pantheon/apps/appcenter/default.nix

@@ -39,7 +39,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-calculator/default.nix

@@ -31,8 +31,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-calendar/default.nix

@@ -38,8 +38,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-camera/default.nix

@@ -36,8 +36,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-code/default.nix

@@ -40,8 +40,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-feedback/default.nix

@@ -31,8 +31,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-files/default.nix

@@ -45,8 +45,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-music/default.nix

@@ -42,8 +42,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-photos/default.nix

@@ -46,8 +46,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-screenshot-tool/default.nix

@@ -30,8 +30,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-terminal/default.nix

@@ -33,8 +33,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/elementary-videos/default.nix

@@ -32,8 +32,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/apps/sideload/default.nix

@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix

@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix

@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix

@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix

@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix

@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/onlineaccounts/default.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix

@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix

@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/apps/switchboard/default.nix

@@ -28,7 +28,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/artwork/elementary-gtk-theme/default.nix

@@ -21,8 +21,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/artwork/elementary-icon-theme/default.nix

@@ -23,8 +23,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/artwork/elementary-sound-theme/default.nix

@@ -19,19 +19,18 @@ stdenv.mkDerivation rec {
     sha256 = "1dc583lq61c361arjl3s44d2k72c46bqvcqv1c3s69f2ndsnxjdz";
   };
 
-  passthru = {
-    updateScript = pantheon.updateScript {
-      inherit repoName;
-      attrPath = pname;
-    };
-  };
-
   nativeBuildInputs = [
     meson
     ninja
     pkgconfig
   ];
 
+  passthru = {
+    updateScript = pantheon.updateScript {
+      attrPath = "pantheon.${pname}";
+    };
+  };
+
   meta = with stdenv.lib; {
     description = "A set of system sounds for elementary";
     homepage = https://github.com/elementary/sound-theme;

pkgs/desktops/pantheon/artwork/elementary-wallpapers/default.nix

@@ -27,8 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/default.nix

@@ -54,6 +54,8 @@ lib.makeScope pkgs.newScope (self: with self; {
     wingpanel-indicator-session wingpanel-indicator-sound
   ];
 
+  nixpkgs-github-update = callPackage ./nixpkgs_github_update { };
+
   updateScript = callPackage ./update.nix { };
 
   maintainers = with pkgs.stdenv.lib.maintainers; [ worldofpeace ];

pkgs/desktops/pantheon/desktop/elementary-default-settings/default.nix

@@ -27,8 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/desktop/elementary-greeter/default.nix

@@ -41,8 +41,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
 
     xgreeters = linkFarm "pantheon-greeter-xgreeters" [{

pkgs/desktops/pantheon/desktop/elementary-onboarding/default.nix

@@ -33,8 +33,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/desktop/elementary-print-shim/default.nix

@@ -23,8 +23,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/desktop/elementary-session-settings/default.nix

@@ -128,8 +128,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
     providedSessions = [ "pantheon" ];
   };

pkgs/desktops/pantheon/desktop/elementary-shortcut-overlay/default.nix

@@ -30,8 +30,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/desktop/gala/default.nix

@@ -37,8 +37,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
-      versionPolicy = "master";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix

@@ -39,8 +39,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix

@@ -28,7 +28,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix

@@ -28,7 +28,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix

@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/desktop/wingpanel/default.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/granite/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/nixpkgs_github_update/.envrc

@@ -0,0 +1 @@
+use nix

pkgs/desktops/pantheon/nixpkgs_github_update/.formatter.exs

@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

pkgs/desktops/pantheon/nixpkgs_github_update/.gitignore

@@ -0,0 +1,32 @@
+# The directory Mix will write compiled artifacts to.
+_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+cover/
+
+# The directory Mix downloads your dependencies sources to.
+deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+nixpkgs_github_update-*.tar
+
+# Ignore elixir_ls
+.elixir_ls
+
+# mix escript.build result
+nixpkgs_github_update
+
+# lockfile. only because this is nixpkgs.
+mix.lock

pkgs/desktops/pantheon/nixpkgs_github_update/default.nix

@@ -0,0 +1,53 @@
+{ lib
+, beamPackages
+, makeWrapper
+, common-updater-scripts
+}:
+
+let
+
+  poison_4 = beamPackages.buildMix {
+    name = "poison";
+    version = "4.0.1";
+
+    src = beamPackages.fetchHex {
+      pkg = "poison";
+      version = "4.0.1";
+      sha256 = "098gdz7xzfmnjzgnnv80nl4h3zl8l9czqqd132vlnfabxbz3d25s";
+    };
+  };
+
+
+in
+
+beamPackages.buildMix {
+  name = "nixpkgs-github-update";
+  version = "0.1.0";
+
+  src = lib.cleanSource ./.;
+
+  nativeBuildInputs = [
+    makeWrapper
+  ];
+
+  beamDeps = with beamPackages; [ erlang poison_4 ];
+
+  buildPhase = ''
+    export HEX_OFFLINE=1
+    export HEX_HOME=`pwd`
+    export MIX_ENV=prod
+    export MIX_NO_DEPS=1
+
+    mix escript.build --no-deps-check
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp nixpkgs_github_update $out/bin
+  '';
+
+  postFixup = ''
+    wrapProgram $out/bin/nixpkgs_github_update \
+      --prefix PATH : "${lib.makeBinPath [ common-updater-scripts ]}"
+  '';
+}

pkgs/desktops/pantheon/nixpkgs_github_update/lib/nixpkgs_github_update/cli.ex

@@ -0,0 +1,71 @@
+defmodule NixpkgsGitHubUpdate.CLI do
+  @moduledoc """
+  Run updates on Nix Expressions that use fetchFromGitHub.
+
+  Arguments the script accepts:
+  --attribute <attribute_path>
+
+  Example usage:
+  ```
+  ./nixpkgs_github_update --attribute "notes-up"
+  ```
+  """
+  alias NixpkgsGitHubUpdate.{Nix, GitHubLatestVersion}
+
+  def help do
+    IO.puts("""
+    Run updates on Nix Expressions that use fetchFromGitHub.
+
+    Arguments the script accepts:
+    --attribute <attribute_path>
+
+    Example usage:
+    ./nixpkgs_github_update --attribute "notes-up"
+    """)
+  end
+
+  def main([]) do
+    help()
+  end
+
+  def main(args) do
+    opts = parse_args(args)
+
+    attribute = opts[:attribute]
+
+    case Nix.attribute_exists?(attribute) do
+      true -> update(attribute)
+      _ -> exit("Requested attribute doesn't exist.")
+    end
+  end
+
+  def parse_args(args) do
+    {options, _, _} =
+      args
+      |> OptionParser.parse(strict: [attribute: :string])
+
+    options
+  end
+
+  def update(attribute) do
+    version =
+      Nix.get_owner_repo(attribute)
+      |> GitHubLatestVersion.fetch()
+      |> decode_response()
+      |> construct_version()
+
+    Nix.update_source_version(attribute, version)
+  end
+
+  def decode_response({:ok, response}), do: response
+
+  def decode_response({:error, error}) do
+    IO.puts("Error getting latest release from GitHub: #{error["message"]}")
+    System.halt(2)
+  end
+
+  def construct_version(response) do
+    Map.get(response, "tag_name")
+    |> String.trim_leading("v")
+  end
+end

pkgs/desktops/pantheon/nixpkgs_github_update/lib/nixpkgs_github_update/github_latest_version.ex

@@ -0,0 +1,31 @@
+defmodule NixpkgsGitHubUpdate.GitHubLatestVersion do
+  @user_agent 'httpc'
+
+  def fetch({owner, repo}) do
+    endpoint = releases_endpoint(owner, repo)
+
+    oauth_token = String.to_charlist("#{System.get_env("OAUTH_TOKEN")}")
+
+    headers = %{
+      'User-Agent' => @user_agent,
+      'Authorization' => 'token #{oauth_token}'
+    }
+
+    :httpc.request(:get, {endpoint, Map.to_list(headers)}, [], [])
+    |> handle_response
+  end
+
+  def releases_endpoint(owner, repo) do
+    'https://api.github.com/repos/#{owner}/#{repo}/releases/latest'
+  end
+
+  def handle_response({_, {{_httpv, status_code, _}, _headers, response}}) do
+    {
+      status_code |> check_for_error(),
+      response |> Poison.Parser.parse!(%{})
+    }
+  end
+
+  defp check_for_error(200), do: :ok
+  defp check_for_error(_), do: :error
+end

pkgs/desktops/pantheon/nixpkgs_github_update/lib/nixpkgs_github_update/nix.ex

@@ -0,0 +1,75 @@
+defmodule NixpkgsGitHubUpdate.Nix do
+  def executable do
+    nix = System.find_executable("nix")
+
+    if nil === nix do
+      raise RuntimeError, message: "missing executable for 'nix'"
+    end
+
+    nix
+  end
+
+  def eval!(attribute) do
+    System.cmd(
+      executable(),
+      [
+        "eval",
+        "--json",
+        attribute
+      ],
+      stderr_to_stdout: true
+    )
+    |> handle_eval
+  end
+
+  def handle_eval({eval_result, 0}) do
+    case eval_result do
+      "" -> eval_result
+      _ -> Poison.Parser.parse!(eval_result, %{})
+    end
+  end
+
+  def handle_eval({eval_result, _}) do
+    IO.puts("Error running nix eval: #{eval_result}")
+  end
+
+  def attribute_exists?(attribute) do
+    eval!("(with import <nixpkgs> {}; lib.isDerivation #{attribute})")
+  end
+
+  def update_source_version(attribute, version) do
+    System.cmd("update-source-version", [
+      attribute,
+      version
+    ])
+  end
+
+  def get_url_attr(attribute) do
+    case eval!("nixpkgs.#{attribute}.src.fetchSubmodules") do
+      true -> "url"
+      _ -> "urls"
+    end
+  end
+
+  def get_owner_repo(attribute) do
+    url_attr = get_url_attr(attribute)
+
+    eval!("nixpkgs.#{attribute}.src.#{url_attr}")
+    |> case do
+      # It's fetchFromGitHub if we got a list
+      [url | _] ->
+        URI.parse(url).path
+        |> String.split("/archive", trim: true)
+        |> List.first()
+        |> String.split("/", trim: true)
+
+      # It's fetchgit if we got a plain string
+      url ->
+        URI.parse(url).path
+        |> String.split(".git", trim: true)
+        |> List.first()
+        |> String.split("/", trim: true)
+    end
+    |> List.to_tuple()
+  end
+end

pkgs/desktops/pantheon/nixpkgs_github_update/mix.exs

@@ -0,0 +1,28 @@
+defmodule NixpkgsGitHubUpdate.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :nixpkgs_github_update,
+      version: "0.1.0",
+      elixir: "~> 1.9",
+      escript: [main_module: NixpkgsGitHubUpdate.CLI],
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger, :inets, :ssl]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      {:poison, "~> 4.0.1"}
+    ]
+  end
+end

pkgs/desktops/pantheon/nixpkgs_github_update/shell.nix

@@ -0,0 +1,19 @@
+with import <nixpkgs> {};
+
+let
+  inherit (lib) optional;
+in
+
+mkShell rec {
+  name = "nixpkgs-github-update-shell";
+
+  buildInputs = [
+    elixir
+    erlang
+    common-updater-scripts
+  ]
+  ++ optional stdenv.isLinux libnotify # For ExUnit Notifier on Linux.
+  ++ optional stdenv.isLinux inotify-tools # For file_system on Linux.
+  ;
+
+}

pkgs/desktops/pantheon/services/cerbere/default.nix

@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/services/contractor/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/services/elementary-capnet-assist/default.nix

@@ -30,8 +30,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/services/elementary-dpms-helper/default.nix

@@ -25,8 +25,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      inherit repoName;
+      attrPath = "pantheon.${pname}";
-      attrPath = pname;
     };
   };
 

pkgs/desktops/pantheon/services/pantheon-agent-geoclue2/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/services/pantheon-agent-polkit/default.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     updateScript = pantheon.updateScript {
-      repoName = pname;
+      attrPath = "pantheon.${pname}";
     };
   };
 

pkgs/desktops/pantheon/update.nix

@@ -1,36 +1,6 @@
-{ runCommand
+{ nixpkgs-github-update }:
-, nix
-, bash
-, git
-, jq
-, nix-prefetch-scripts
-, coreutils
-, common-updater-scripts
-, gnugrep
-, gnused
-, curl
-}:
 
-{ repoName
+{ attrPath }:
-, attrPath ? repoName
-, versionPolicy ? "release"
-}:
 
-let
-  script = ./update.sh;
 
-  updateScript = runCommand "update.sh" {
+[ "${nixpkgs-github-update}/bin/nixpkgs_github_update" "--attribute" attrPath ]
-    inherit bash git jq nix coreutils gnugrep gnused curl;
-    # These weren't being substituted
-    nix_prefetch_scripts = nix-prefetch-scripts;
-    common_updater_scripts = common-updater-scripts;
-  } ''
-    substituteAll ${script} $out
-    chmod +x $out
-  '';
-
-  throwFlag = throw "${versionPolicy} is not a valid versionPolicy - Options are either 'release' or 'master' (defaults to release).";
-
-  versionFlag = { release = "-r"; master = "-m"; }.${versionPolicy} or throwFlag;
-
-in [ updateScript versionFlag repoName attrPath ]

pkgs/desktops/pantheon/update.sh

@@ -1,236 +0,0 @@
-#!@bash@/bin/bash
-PATH=@bash@/bin:@nix_prefetch_scripts@/bin:@common_updater_scripts@/bin:@git@/bin:@jq@/bin:@nix@/bin:@gnugrep@/bin:@gnused@/bin:@curl@/bin:$PATH
-#!/usr/bin/env bash
-
-set -eu -o pipefail
-
-#
-# ─── HOW TO USE ─────────────────────────────────────────────────────────────────
-#
-
-function usage ( ) {
-    cat <<EOF
-Usage: update.sh <repo_name> <attr>
-EOF
-}
-
-#
-# ─── POINTS YOU IN THE RIGHT DIRECTION ──────────────────────────────────────────
-#
-
-    function usage_tip ( ) {
-      echo 'run `update.sh -h` for usage instructions' >&2
-      exit 1
-    }
-
-#
-# ─── OPTIONS: RELEASE | MASTER ────────────────────────────────────────────────────
-#
-
-    while getopts ":hrm" opt; do
-        case $opt in
-            r)
-                release=1
-                master=0
-                ;;
-            m)
-                master=1
-                release=0
-                ;;
-            h)
-                usage
-                exit
-                ;;
-            ?)
-                echo "Invalid option: -$OPTARG" >&2
-                usage_tip
-                ;;
-      esac
-    done
-
-    shift $((OPTIND-1))
-
-#
-# ─── FAIL WITH MESSAGE AND NON-ZERO EXIT STATUS ─────────────────────────────────
-#
-
-    function fail ( ) {
-        echo "$1" >&2
-        exit 1
-    }
-
-#
-# ─── UPDATES PACKAGE TO LATEST TAGGED RELEASE ───────────────────────────────
-#
-
-    function update_to_latest_release ( ) {
-        repo_name="$1"
-        attr="$2"
-
-        version=$(get_latest_tag "$repo_name")
-        fetch=$(fetch "$repo_name" "refs/tags/${version}")
-        sha256=$(get_hash "${fetch}")
-
-        update-source-version "pantheon.$attr" "$version" "$sha256"
-
-        nix_file=$(get_file_path $attr)
-
-        if [ ! -f "$nix_file" ]; then
-            fail "Couldn't evaluate 'pantheon.$attr.meta.position' to locate the .nix file!"
-        fi
-
-        correct_rev "$attr" "$nix_file" "version"
-    }
-
-#
-# ─── UPDATES PACKAGE TO MASTER ──────────────────────────────────────────────────
-#
-
-    function update_to_master ( ) {
-        repo_name="$1"
-        attr="$2"
-
-        fetch=$(fetch "$repo_name" "refs/heads/master")
-
-        version=$(get_version "$fetch")
-        sha256=$(get_hash "$fetch")
-        proper_version=$(get_master_date "$fetch")
-
-        update-source-version "pantheon.$attr" "$proper_version" "$sha256"
-
-        nix_file=$(get_file_path $attr)
-
-        if [ ! -f "$nix_file" ]; then
-            fail "Couldn't evaluate 'pantheon.$attr.meta.position' to locate the .nix file!"
-        fi
-
-        correct_rev "$attr" "$nix_file" '"'$version'"'
-    }
-
-#
-# ─── GETS THE LATEST TAGGED RELEASE NAME FROM GITHUB ─────────────────────
-#
-
-    function get_latest_tag ( ) {
-        repo_name="$1"
-
-        OAUTH_TOKEN=$(printenv OAUTH_TOKEN)
-
-        if [ -n "$OAUTH_TOKEN"  ]; then
-            curl \
-                --silent \
-                --show-error \
-                --fail \
-                -X GET \
-                --header "Authorization: token $OAUTH_TOKEN" \
-                "https://api.github.com/repos/elementary/$repo_name/releases/latest" \
-                | jq -r '.tag_name'
-        else
-            curl \
-                --silent \
-                --show-error \
-                --fail \
-                -X GET \
-                "https://api.github.com/repos/elementary/$repo_name/releases/latest" \
-                | jq -r '.tag_name'
-        fi
-    }
-
-#
-# ─── FETCHES REPO AND RETURNS RELEVANT INFORMATION ──────────────────
-#
-
-    function fetch ( ) {
-        repo_name="$1"
-        version="$2"
-
-        base_url="https://github.com/elementary"
-        full_url="$base_url/$repo_name"
-
-        nix-prefetch-git --quiet --no-deepClone --url "$full_url" --rev "$version"
-    }
-
-#
-# ─── PARSES GIT REVISION FROM FETCH ─────────────────────────────────────────────
-#
-
-    function get_version ( ) {
-        fetch_info="$1"
-
-        echo "$fetch_info" | jq -r '.rev'
-    }
-
-#
-# ─── PARSES HASH FROM FETCH ─────────────────────────────────────────────────────
-#
-
-    function get_hash ( ) {
-        fetch_info="$1"
-
-        echo "$fetch_info" | jq -r '.sha256'
-    }
-
-#
-# ─── PARSES DATE FROM FETCH AND NORMALIZES IT TO NIXPKGS STANDARD ───────────────
-#
-
-    function get_master_date ( ) {
-        fetch_info="$1"
-
-        full_date=$(echo "$fetch_info" | jq -r '.date')
-        short_date=$(date -d "$full_date" +"%Y-%m-%d")
-
-        echo "unstable-$short_date"
-    }
-
-#
-# ─── RETURN NIX EXPRESSION PATH ─────────────────────────────────────────────────
-#
-
-    function get_file_path () {
-        attr="$1"
-
-        nix-instantiate --eval --strict -A "pantheon.$attr.meta.position" | sed -re 's/^"(.*):[0-9]+"$/\1/'
-    }
-
-#
-# ─── CORRECTS REV VERSION ───────────────────────────────────────────────────────────
-#
-
-    function correct_rev ( ) {
-        attr="$1"
-        nix_file="$2"
-        rev="$3"
-
-        check_pattern1='^\s*rev\s*=\s*"[0-9a-f]{5,40}"'
-        check_pattern2='^\s*rev\s*=\s*version'
-
-        replace_pattern1='/\brev\b\s*=/ s|\"[0-9a-f]{5,40}\"|'$rev'|'
-        replace_pattern2='/\brev\b\s*=/ s|version|'$rev'|'
-
-        if [ $(grep -c -P "$check_pattern1" "$nix_file") = 1 ]; then
-            pattern="$replace_pattern1"
-        elif [ $(grep -c -P "$check_pattern2" "$nix_file") = 1 ]; then
-            pattern="$replace_pattern2"
-        else
-            fail "Couldn't figure out where out where to patch in the correct version in pantheon.$attr!"
-        fi
-
-        sed -i.bak "$nix_file" -re "$pattern"
-        rm -f "$nix_file.bak"
-    }
-
-
-#
-# ─── WHETHER TO UPDATE TO RELEASE OR MASTER ──────────────────────────────────
-#
-
-    if [ $release = 1 ]; then
-        update_to_latest_release $1 $2
-    elif [ $master = 1 ]; then
-        update_to_master $1 $2
-    else
-      exit 1
-    fi
-
-# ────────────────────────────────────────────────────────────────────────────────