From 03f2847054901c93edd2a1c6613625e8efca3d17 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 26 Apr 2012 15:19:23 +0000
Subject: [PATCH] * Set preferLocalBuild on a few trivial top-level
 derivations.  These   tend to cause a lot of unnecessary I/O to the build
 machines.

svn path=/nixos/trunk/; revision=33936
---
 modules/system/activation/top-level.nix | 1 +
 modules/system/upstart/upstart.nix      | 2 +-
 modules/virtualisation/qemu-vm.nix      | 3 ++-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/modules/system/activation/top-level.nix b/modules/system/activation/top-level.nix
index 6ebc1fd68e1a..9557c12aca78 100644
--- a/modules/system/activation/top-level.nix
+++ b/modules/system/activation/top-level.nix
@@ -147,6 +147,7 @@ let
   # and makes it bootable.
   system = pkgs.stdenv.mkDerivation {
     name = "nixos-${config.system.nixosVersion}";
+    preferLocalBuild = true;
     buildCommand = systemBuilder;
     inherit children;
     kernelParams =
diff --git a/modules/system/upstart/upstart.nix b/modules/system/upstart/upstart.nix
index 5a5f6016b57c..1bfde9fc60ee 100644
--- a/modules/system/upstart/upstart.nix
+++ b/modules/system/upstart/upstart.nix
@@ -135,7 +135,7 @@ let
 
     in
       pkgs.runCommand ("upstart-" + job.name + ".conf")
-        { inherit (job) buildHook; inherit jobText; }
+        { inherit (job) buildHook; inherit jobText; preferLocalBuild = true; }
         ''
           eval "$buildHook"
           echo "$jobText" > $out
diff --git a/modules/virtualisation/qemu-vm.nix b/modules/virtualisation/qemu-vm.nix
index 9596822cd8f6..add88753f009 100644
--- a/modules/virtualisation/qemu-vm.nix
+++ b/modules/virtualisation/qemu-vm.nix
@@ -184,6 +184,7 @@ let
     { exportReferencesGraph =
         map (x: [("closure-" + baseNameOf x) x]) config.virtualisation.pathsInNixDB;
       buildInputs = [ pkgs.perl ];
+      preferLocalBuild = true;
     }
     ''
       printRegistration=1 perl ${pkgs.pathsFromGraph} closure-* > $out
@@ -353,7 +354,7 @@ in
   # Don't run ntpd in the guest.  It should get the correct time from KVM.
   services.ntp.enable = false;
 
-  system.build.vm = pkgs.runCommand "nixos-vm" {}
+  system.build.vm = pkgs.runCommand "nixos-vm" { preferLocalBuild = true; }
     ''
       ensureDir $out/bin
       ln -s ${config.system.build.toplevel} $out/system