added tools to pack/unpack ramdisks

pack-initrd

@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+
+initrd=${1:-initrd.img}
+ramdisk=${2:-ramdisk}
+
+( cd $ramdisk; find | sort | cpio --quiet -o -H newc ) | gzip > $initrd
+

unpack-initrd

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+
+initrd=${1:-initrd.img}
+ramdisk=${2:-ramdisk}
+
+if [ -d $ramdisk ]; then
+    echo "$ramdisk already exists."
+    exit 1
+fi
+
+mkdir -p $ramdisk
+
+zcat $initrd | ( cd $ramdisk; cpio -i )
+