Mount devtmpfs in the initrd

It seems that udev now requires devtmpfs, so enable it.

modules/system/boot/stage-1-init.sh

@@ -66,17 +66,10 @@ mkdir -p /proc
 mount -t proc none /proc
 mkdir -p /sys
 mount -t sysfs none /sys
-mount -t tmpfs -o "mode=0755,size=@devSize@" none /dev
+mount -t devtmpfs -o "size=@devSize@" none /dev
 mkdir -p /run
 mount -t tmpfs -o "mode=0755,size=@runSize@" none /run
 
-# Some console devices, for the interactivity
-mknod /dev/console c 5 1
-mknod /dev/tty c 5 0
-mknod /dev/tty1 c 4 1
-mknod /dev/ttyS0 c 4 64
-mknod /dev/ttyS1 c 4 65
-
 # Process the kernel command line.
 export stage2Init=/init
 for o in $(cat /proc/cmdline); do
@@ -127,10 +120,6 @@ for i in @kernelModules@; do
 done
 
 
-# Create /dev/null.
-mknod /dev/null c 1 3
-
-
 # Create device nodes in /dev.
 echo "running udev..."
 export UDEV_CONFIG_FILE=@udevConf@

modules/system/boot/stage-1.nix

@@ -154,7 +154,6 @@ let
       # Copy some coreutils.
       cp -v ${pkgs.coreutils}/bin/basename $out/bin
       cp -v ${pkgs.coreutils}/bin/mkdir $out/bin
-      cp -v ${pkgs.coreutils}/bin/mknod $out/bin
       cp -v ${pkgs.coreutils}/bin/chmod $out/bin
       cp -v ${pkgs.coreutils}/bin/cat $out/bin
       cp -v ${pkgs.coreutils}/bin/chroot $out/bin

modules/system/boot/stage-2-init.sh

@@ -39,7 +39,7 @@ if [ ! -e /proc/1 ]; then
     mkdir -m 0755 -p /sys
     mount -t sysfs none /sys
     mkdir -m 0755 -p /dev
-    mount -t tmpfs -o "mode=0755" none /dev
+    mount -t devtmpfs none /dev
 
     # Create the minimal device nodes needed for the activation scripts
     # and Upstart.