go2nix: extracted from goPackages

pkgs/development/go-modules/libs.json

@@ -1258,5 +1258,41 @@
       "rev": "ea925a0a47d225b2ca7f9932b01d2ed4f3ec74f6",
       "sha256": "15wqjpkfzsxnaxbz6y4r91hw6812g3sc4ipagxw1bya9klbnkdc9"
     }
+  },
+  {
+    "goPackagePath": "github.com/alecthomas/template",
+    "fetch": {
+      "type": "git",
+      "url": "https://github.com/alecthomas/template",
+      "rev": "14fd436dd20c3cc65242a9f396b61bfc8a3926fc",
+      "sha256": "19rzvvcgvr1z2wz9xpqsmlm8syizbpxjp5zbzgakvrqlajpbjvx2"
+    }
+  },
+  {
+    "goPackagePath": "github.com/alecthomas/units",
+    "fetch": {
+      "type": "git",
+      "url": "https://github.com/alecthomas/units",
+      "rev": "2efee857e7cfd4f3d0138cc3cbb1b4966962b93a",
+      "sha256": "1j65b91qb9sbrml9cpabfrcf07wmgzzghrl7809hjjhrmbzri5bl"
+    }
+  },
+  {
+    "goPackagePath": "gopkg.in/alecthomas/kingpin.v2",
+    "fetch": {
+      "type": "git",
+      "url": "https://gopkg.in/alecthomas/kingpin.v2",
+      "rev": "21551c2a6259a8145110ca80a36e25c9d7624032",
+      "sha256": "1zhpqc4qxsw9lc1b4dwk5r42k9r702ihzrabs3mnsphvm9jx4l59"
+    }
+  },
+  {
+    "goPackagePath": "github.com/Masterminds/vcs",
+    "fetch": {
+      "type": "git",
+      "url": "https://github.com/Masterminds/vcs",
+      "rev": "9c0db6583837118d5df7c2ae38ab1c194e434b35",
+      "sha256": "0590ww2av4407y7zy3bcmnr8i74fv00k9zzcxcpjxivl6qszna0d"
+    }
   }
 ]

pkgs/development/tools/go2nix/default.nix

@@ -0,0 +1,32 @@
+# This file was generated by go2nix.
+{ stdenv, lib, goPackages, go-bindata, goimports, nix-prefetch-git, git, makeWrapper,
+  fetchgit, fetchhg, fetchbzr, fetchsvn }:
+
+with goPackages;
+
+buildGoPackage rec {
+  name = "go2nix-${version}";
+  version = "20160307-${stdenv.lib.strings.substring 0 7 rev}";
+  rev = "4c552dadd855e3694ed3499feb46dca9cd855f60";
+
+  goPackagePath = "github.com/kamilchm/go2nix";
+
+  src = fetchgit {
+    inherit rev;
+    url = "https://github.com/kamilchm/go2nix";
+    sha256 = "1pwnm1vrjxvgl17pk9n1k5chmhgwxkrwp2s1bzi64xf12anibj63";
+  };
+
+  goDeps = ./deps.json;
+
+  buildInputs = [ go-bindata goimports makeWrapper ];
+  preBuild = ''go generate ./...'';
+
+  postInstall = ''
+    wrapProgram $bin/bin/go2nix \
+      --prefix PATH : ${nix-prefetch-git}/bin \
+      --prefix PATH : ${git}/bin
+  '';
+
+  allowGoReference = true;
+}

pkgs/development/tools/go2nix/deps.json

@@ -0,0 +1,11 @@
+[
+  {
+    "include": "../../libs.json",
+    "packages": [
+      "github.com/alecthomas/template",
+      "github.com/alecthomas/units",
+      "gopkg.in/alecthomas/kingpin.v2",
+      "github.com/Masterminds/vcs"
+    ]
+  }
+]

pkgs/top-level/all-packages.nix

@@ -9628,7 +9628,7 @@ in
 
   goPackages = go16Packages;
 
-  go2nix = goPackages.go2nix.bin // { outputs = [ "bin" ]; };
+  go2nix = callPackage ../development/tools/go2nix { };
 
   ### DEVELOPMENT / LISP MODULES
 

pkgs/top-level/go-packages.nix

@@ -3241,25 +3241,6 @@ let
     goPackageAliases = [ "gopkg.in/alecthomas/kingpin.v2" ];
   };
 
-  go2nix = buildFromGitHub rec {
-    rev = "4c552dadd855e3694ed3499feb46dca9cd855f60";
-    owner = "kamilchm";
-    repo = "go2nix";
-    sha256 = "1pwnm1vrjxvgl17pk9n1k5chmhgwxkrwp2s1bzi64xf12anibj63";
-
-    buildInputs = [ pkgs.makeWrapper go-bindata.bin tools.bin vcs go-spew gls go-difflib assertions goconvey testify kingpin ];
-
-    preBuild = ''go generate ./...'';
-
-    postInstall = ''
-      wrapProgram $bin/bin/go2nix \
-        --prefix PATH : ${pkgs.nix-prefetch-git}/bin \
-        --prefix PATH : ${pkgs.git}/bin
-    '';
-
-    allowGoReference = true;
-  };
-
   godotenv = buildFromGitHub rec {
     rev    = "4ed13390c0acd2ff4e371e64d8b97c8954138243";
     version = "2015-09-07";