* Modularise vfat support. Also add fsck.vfat to the initrd. This

prevents errors when booting from VFAT (e.g. an ISO image converted
  using unetbootin).

svn path=/nixos/trunk/; revision=32956

modules/installer/cd-dvd/iso-image.nix

@@ -259,4 +259,9 @@ in
       touch /etc/NIXOS
       ${config.environment.nix}/bin/nix-env -p /nix/var/nix/profiles/system --set /var/run/current-system
     '';
+
+  # Add vfat support to the initrd to enable people to copy the
+  # contents of the CD to a bootable USB stick.
+  boot.initrd.supportedFilesystems = [ "vfat" ];
+    
 }

modules/module-list.nix

@@ -203,6 +203,7 @@
   ./tasks/filesystems/ext.nix
   ./tasks/filesystems/nfs.nix
   ./tasks/filesystems/reiserfs.nix
+  ./tasks/filesystems/vfat.nix
   ./tasks/kbd.nix
   ./tasks/lvm.nix
   ./tasks/network-interfaces.nix

modules/profiles/all-hardware.nix

@@ -41,10 +41,6 @@
 
       # Virtio (QEMU, KVM etc.) support.
       "virtio_net" "virtio_pci" "virtio_blk" "virtio_balloon" "virtio_console"
-
-      # Add vfat to enable people to copy the contents of the CD to a
-      # bootable USB stick.
-      "vfat" "nls_cp437" "nls_iso8859-1"
     ];
 
   boot.initrd.kernelModules =

modules/profiles/base.nix

@@ -51,6 +51,6 @@
   ];
 
   # Include support for various filesystems.
-  boot.supportedFilesystems = [ "btrfs" "reiserfs" ];
+  boot.supportedFilesystems = [ "btrfs" "reiserfs" "vfat" ];
 
 }

modules/tasks/filesystems/vfat.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  inInitrd = any (fs: fs == "vfat") config.boot.initrd.supportedFilesystems;
+
+in
+
+{
+  config = mkIf (any (fs: fs == "vfat") config.boot.supportedFilesystems) {
+
+    system.fsPackages = [ pkgs.dosfstools ];
+
+    boot.initrd.kernelModules = mkIf inInitrd [ "vfat" "nls_cp437" "nls_iso8859-1" ];
+
+    boot.initrd.extraUtilsCommands = mkIf inInitrd
+      ''
+        cp -v ${pkgs.dosfstools}/sbin/dosfsck $out/bin
+        ln -sv dosfsck $out/bin/fsck.vfat
+      '';
+
+  };
+}