Support using the internal NAND as the persistent /home for the OLPC

The OLPC's internal NAND is a really good idea to use for /home rather than
taking up the very hard to find RAM.  The NAND is default set up with a
/home on mtd0, so also do some magic so that we create our homedir under that
/home.

fedora-live-base.ks

@@ -131,7 +131,10 @@ mountPersistentHome() {
   fi
 
   # if we're given a file rather than a blockdev, loopback it
-  if [ ! -b "\$homedev" ]; then
+  if [ "\${homedev##mtd}" != "\${homedev}" ]; then
+    # mtd devs don't have a block device but get magic-mounted with -t jffs2
+    mountopts="-t jffs2"
+  elif [ ! -b "\$homedev" ]; then
     loopdev=\`losetup -f\`
     if [ "\${homedev##/mnt/live}" != "\${homedev}" ]; then
       action "Remounting live store r/w" mount -o remount,rw /mnt/live
@@ -141,7 +144,7 @@ mountPersistentHome() {
   fi
 
   # if it's encrypted, we need to unlock it
-  if [ "\$(/lib/udev/vol_id -t \$homedev)" = "crypto_LUKS" ]; then
+  if [ "\$(/lib/udev/vol_id -t \$homedev 2>/dev/null)" = "crypto_LUKS" ]; then
     echo
     echo "Setting up encrypted /home device"
     plymouth ask-for-password --command="cryptsetup luksOpen \$homedev EncHome"
@@ -149,7 +152,10 @@ mountPersistentHome() {
   fi
 
   # and finally do the mount
-  mount \$homedev /home
+  mount \$mountopts \$homedev /home
+  # if we have /home under what's passed for persistent home, then
+  # we should make that the real /home.  useful for mtd device on olpc
+  if [ -d /home/home ]; then mount --bind /home/home /home ; fi
   [ -x /sbin/restorecon ] && /sbin/restorecon /home
   if [ -d /home/liveuser ]; then USERADDARGS="-M" ; fi
 }