From b75d15a9a88c5f8e31d1c91d44cbaaf00e3bb8f2 Mon Sep 17 00:00:00 2001
From: Rob Vermaas <rob.vermaas@gmail.com>
Date: Fri, 16 Apr 2010 15:09:47 +0000
Subject: [PATCH] virtualisation: add option to switch off readonly host fs in
 vm

svn path=/nixos/trunk/; revision=21126
---
 lib/testing.nix                    |  1 +
 modules/virtualisation/qemu-vm.nix | 11 ++++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/testing.nix b/lib/testing.nix
index ca0b7297251..392ae8ca9b0 100644
--- a/lib/testing.nix
+++ b/lib/testing.nix
@@ -145,6 +145,7 @@ rec {
         { config, pkgs, ... }:
         {
           virtualisation.memorySize = 1024;
+          virtualisation.readonlyHostFS = false;
           services.xserver.enable = true;
           services.xserver.displayManager.slim.enable = false;
           services.xserver.displayManager.auto.enable = true;
diff --git a/modules/virtualisation/qemu-vm.nix b/modules/virtualisation/qemu-vm.nix
index a17e167cb46..c8b45f86b82 100644
--- a/modules/virtualisation/qemu-vm.nix
+++ b/modules/virtualisation/qemu-vm.nix
@@ -60,6 +60,15 @@ let
           '';
       };
       
+    virtualisation.readonlyHostFS =
+      mkOption {
+        default = true;
+        description =
+          ''
+            Whether to mount the hostfs read-only.
+          '';
+      };
+      
   };
 
   cfg = config.virtualisation;
@@ -163,7 +172,7 @@ in
       { mountPoint = "/hostfs";
         device = "//10.0.2.4/qemu";
         fsType = "cifs";
-        options = "guest,username=nobody,noperm";
+        options = "guest,username=nobody${if config.virtualisation.readonlyHostFS then ",noperm" else ""}";
         neededForBoot = true;
       }
       { mountPoint = "/nix/store";