Add godep, dependency tool for go

pkgs/development/tools/godep/default.nix

···
+{ stdenv, lib, go, fetchurl, fetchgit, fetchhg, fetchbzr, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  version = "ddd7fbf";
+  name = "godep-${version}";
+
+  src = import ./deps.nix {
+    inherit stdenv lib fetchgit fetchFromGitHub;
+  };
+
+  buildInputs = [ go ];
+
+  buildPhase = ''
+    export GOPATH=$src
+    go build -v -o godep github.com/tools/godep
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    mv godep $out/bin
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Ddependency tool for go";
+    homepage = https://github.com/tools/godep;
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ offline ];
+    platforms = platforms.unix;
+  };
+}

pkgs/development/tools/godep/deps.nix

···
+# This file was generated by go2nix.
+{ stdenv, lib, fetchFromGitHub, fetchgit }:
+
+let
+  goDeps = [
+    {
+      root = "github.com/kr/fs";
+      src = fetchgit {
+        url = "https://github.com/kr/fs.git";
+        rev = "2788f0dbd16903de03cb8186e5c7d97b69ad387b";
+        sha256 = "1c0fipl4rsh0v5liq1ska1dl83v3llab4k6lm8mvrx9c4dyp71ly";
+      };
+    }
+    {
+      root = "github.com/tools/godep";
+      src = fetchgit {
+        url = "https://github.com/tools/godep.git";
+        rev = "0baa7ea464025b2cb8e84b13c5ac4da99237a1bf";
+        sha256 = "10hr10fj6ymmfzwjg5drf7j0f4mrpb4p97a01rqp7xvfv5j0zisj";
+      };
+    }
+    {
+      root = "golang.org/x/net";
+      src = fetchgit {
+        url = "https://go.googlesource.com/net";
+        rev = "8b2d0ae1f4c3b83c10ff17e89a89ff04cc0903c3";
+        sha256 = "0nxawxhq7yysbrrd88hkqzfr5hvsqpd452yzi53cp1afzma3zjay";
+      };
+    }
+    {
+      root = "golang.org/x/text";
+      src = fetchgit {
+        url = "https://go.googlesource.com/text";
+        rev = "bfad311ce93436dc888b40d76c78f99dc3104473";
+        sha256 = "1mbhp5q24drz2l2x6ib3180i42f9015ry80bn7jhr7rwizvyp6lh";
+      };
+    }
+    {
+      root = "golang.org/x/tools";
+      src = fetchgit {
+        url = "https://go.googlesource.com/tools";
+        rev = "3ecc311976cc3f7c7b7a50314929bdc1b07c4c9d";
+        sha256 = "0ic3lrg6ykxrlnzcway4ka280n052qysjawf4lvj8gl3r1vlmwfg";
+      };
+    }
+  ];
+
+in
+
+stdenv.mkDerivation rec {
+  name = "go-deps";
+
+  buildCommand =
+    lib.concatStrings
+      (map (dep: ''
+              mkdir -p $out/src/`dirname ${dep.root}`
+              ln -s ${dep.src} $out/src/${dep.root}
+            '') goDeps);
+}

pkgs/top-level/all-packages.nix

···
 
   golint = callPackage ../development/tools/golint { };
 
+  godep = callPackage ../development/tools/godep { };
+
   gogoclient = callPackage ../os-specific/linux/gogoclient { };
 
   nss_ldap = callPackage ../os-specific/linux/nss_ldap { };