Hey everybody,
I just want to share my expirences with initramfs and aufs.
Again I have to say that the kind manner in this list
is something I really like.
my initramfs structur looks like this:
./
|-- aufs
|-- bin
| |-- busybox
| |-- cat -> busybox
| |-- cut -> busybox
| |-- echo -> busybox
| |-- findfs -> busybox
| |-- grep -> busybox
| |-- ls -> busybox
| |-- mdev -> busybox
| |-- mkdir -> busybox
| |-- mount -> busybox
| |-- msh -> busybox
| |-- sh -> busybox
| |-- switch_root -> busybox
| |-- test -> busybox
| `-- umount -> busybox
|-- dev
| `-- console
|-- flashroot
|-- init
|-- newroot
|-- proc
`-- sys
stuffed in a initramfs_data.cpio.gz its about 334K.
The init script can be found below.
--
flip
cat init
#!/bin/sh
#
# simple phase 1 init script
#
# by: Philipp Wehrheim 20071023
#
# This file is released under the GPLv2.
#
export PATH="/bin"
#
# OVERLAYLABEL is the filesystem lable
# of the overlay partition
OVERLAYLABEL="Overlay"
#
# mount
mount -n -t proc proc /proc
mount -n -t sysfs sysfs /sys
mount -n -t tmpfs tmpfs /dev
#
# mdev create devices
mdev -s
#
# find mtd Ramdisk
MTDRAMDISK=`cat /proc/mtd | grep Ramdisk | cut -d':' -f1`
#
# find the overlay partition
#
# WARNING: What happens if more than one Devices with the label is fond?
echo "searching for filesystem $OVERLAYLABEL"
PARTITION=`findfs LABEL=$OVERLAYLABEL 2>/dev/null`
echo "PARTITION: $PARTITION"
# if findfs found a partition try to mount it
if test $? -eq 0 ; then
echo "mounting /aufs partition"
mount $PARTITION /aufs >/dev/null 2>&1
fi
# if the mount did not succeed
if test $? -ne 0 ; then
echo "mounting /aufs with tmpfs"
mount -t tmpfs tmpfs -o size=10m /aufs >/dev/null 2>&1
fi
# extract squash image from flash
cat /dev/$MTDRAMDISK > /squash.img
# mount the squash.img
mount -n -t squashfs -o loop /squash.img /flashroot
# mount aufs and squash.img to newroot
mount -n -t aufs -o br=/aufs:/flashroot none /newroot
# create mountpoints for mount move
mkdir /newroot/system/aufs
mkdir /newroot/system/flashroot
# move the mountpoints
# into the new root
mount --move /aufs /newroot/system/aufs
mount --move /flashroot /newroot/system/flashroot
# clean up
umount -l /proc /sys /dev
# switch root
exec switch_root /newroot /sbin/init
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