[Buildroot] Squashfs boot

[Stephen Turner]

I shouldnt need unionfs as im just loading a basic thinclient and having it
in a ro image would be best to prevent accidental or intentional tampering
when a simple reboot will fix. The rw items can use a temp ramdisk. Only
issue i was running into was figuring out how to read a squashfs at boot
with no initrd or basically  busybox squash output which is only bzImage
and rootfs.squashfs. i have managed to move usr to squash and use the rest
of the os as initrd but if thats what needs to be done then shouldnt the
busybox build script handle that?
On Jan 24, 2013 1:50 PM, "Arnout Vandecappelle" <arnout at mind.be> wrote:

> On 01/22/13 13:41, Stefan Fröberg wrote:
> [snip]
>
>> My /etc/fstab look like this
>> # /etc/fstab: static file system information.
>> #
>> # <file system> <mount pt> <type> <options> <dump> <pass>
>> /modules.sqfs        /lib/modules    squashfs
>>  defaults,auto,loop,noatime    0    0
>> /firmware.sqfs      /lib/firmware    squashfs
>>  defaults,auto,loop,noatime    0    0
>> /dev/cdrom            /mnt/cdrom    iso9660      defaults,noatime    0
>>  0
>> /mnt/cdrom/usr.sqfs        /mnt/ro        squashfs
>>  defaults,auto,loop,noatime    0    0
>>
>
>  Now this is a real use case for being able to split the rootfs into
> several parts.
>
>  However, as Thomas mentioned, it's simpler to just use a complete
> squashfs rootfs and put the unionfs on top of that. How? Somewhere early in
> your init.d you put something like the following (a script I swiped from
> the internet, don't remember where from; I haven't actually tested it
> myself):
>
> #!/bin/sh
>
> CHROOT_PATH="/tmp/unionfs"
> UNION_OPT="-o allow_other,use_ino,suid,dev,**nonempty,chroot=$CHROOT_PATH,
> **max_files=32768"
>
> #mount -t proc proc /proc
> #mount -t tmpfs tmpfs /tmp
>
> mkdir -p $CHROOT_PATH/root
> mkdir -p $CHROOT_PATH/rw
> mkdir -p /tmp/union
>
> # Mount the filesystems
> mount --bind / $CHROOT_PATH/root
> # $CHROOT_PATH/rw is already on a tmpfs so doesn't need to be mounted
>
> modprobe fuse
> $CHROOT_PATH/root/usr/bin/**unionfs $UNION_OPT /rw=RW:/root=RO /tmp/union
>
> #mount -t proc proc /tmp/union/proc
>
> cd /tmp/union
> mkdir oldroot
> pivot_root . oldroot
> cd /
>
> # Move existing mounts, if any
> #umount /proc
> mount --move /oldroot/proc /proc
> mount --move /oldroot/dev /dev
> mount --move /oldroot/sys /sys
> mount --move /oldroot/tmp /tmp
> rmdir /tmp/union
>
> --
> Arnout Vandecappelle                          arnout at mind be
> Senior Embedded Software Architect            +32-16-286500
> Essensium/Mind                                http://www.mind.be
> G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
> LinkedIn profile: http://www.linkedin.com/in/**arnoutvandecappelle<http://www.linkedin.com/in/arnoutvandecappelle>
> GPG fingerprint:  7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F
>
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