From 146dabd4aca9794f685528d2b247cb72f2fc54bd Mon Sep 17 00:00:00 2001
From: Tim Cuthbertson <tim@gfxmonk.net>
Date: Sun, 22 Apr 2018 11:31:41 +1000
Subject: [PATCH] nix-pin: add `passthru.updateScript`

---
 pkgs/tools/package-management/nix-pin/default.nix | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/pkgs/tools/package-management/nix-pin/default.nix b/pkgs/tools/package-management/nix-pin/default.nix
index e2c18f33d61..72cea4de502 100644
--- a/pkgs/tools/package-management/nix-pin/default.nix
+++ b/pkgs/tools/package-management/nix-pin/default.nix
@@ -20,6 +20,19 @@ let self = stdenv.mkDerivation rec {
     let api = import "${self}/share/nix/api.nix" { inherit pkgs; }; in
     {
       inherit (api) augmentedPkgs pins callPackage;
+      updateScript = ''
+        set -e
+        echo
+        cd ${toString ./.}
+        ${pkgs.nix-update-source}/bin/nix-update-source \
+          --prompt version \
+          --replace-attr version \
+          --set owner timbertson \
+          --set repo nix-pin \
+          --set type fetchFromGitHub \
+          --set rev 'version-{version}' \
+          --modify-nix default.nix
+      '';
     };
   meta = with stdenv.lib; {
     homepage = "https://github.com/timbertson/nix-pin";