[Unionfs] UnionFS as root filesystem

[Francesco Carsana]

> rename in your RAMDISK /linuxrc to /etc/init and add the "exec chroot
> ..."-line.
>
>   
 I've made the changes that you suggested, but if I rename /linuxrc to
/etc/init, the kernel doesn't find linuxrc and goes in panic...

My menu.lst is now:

   title           Debian GNU/Linux, kernel 2.4.27 (Safe Mode)
   kernel          (hd0,0)/boot/vmlinuz-2.4.27 ro root=/dev/hda2 
init=/etc/init
                   ramdisk_size=100000 lang=us screen=1280x1024 
vga=0x31B nomce apm=power-off
   initrd          (hd0,0)/boot/roinitrd.img.gz
   savedefault
   boot


and my linuxrc:

   #!/bin/sh
   set -x
   export PATH=.:/:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
   mount -t proc /proc /proc
   mkdir -p /mnt
   mkdir -p /mnt/hda2
   mount -nt ext3 -o rw /dev/hda2 /mnt/hda2
   mkdir -p /mnt/hda1
   mount -nt ext3 -o ro /dev/hda1 /mnt/hda1
   modprobe unionfs
   mount -t unionfs -o dirs="/mnt/hda2=rw:/mnt/hda1=ro" unionfs /mnt/hda2
   cd /mnt/hda2
   mkdir -p initrd
   pivot_root . initrd
   exec chroot . /sbin/init <dev/console >dev/console 2>&1

and I obtain this messages:

   Usage: init 0123456SsQqAaBbCcUu
   VFS: Mounted root (ext3 filesystem).
   Trying to move old root to /initrd ... okay
   Freeing unused kernel memory: 144k freed
   Warning: unable to open an initial console.
   Kernel panic: No init found. Try passing init= option to kernel

It seems that kernel remount /dev/hda2 and so i lost the unionfs, that 
is moved to initrd directory...
How can I solve it?