From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?Stefan_Fr=F6berg?= Date: Fri, 25 Jan 2013 00:40:50 +0200 Subject: [Buildroot] Squashfs boot In-Reply-To: References: <50FE8914.30909@petroprogram.com> <51017295.7020803@mind.be> Message-ID: <5101B872.1090705@petroprogram.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Thin client? Ah, now I beging to understand why you needed to load that squashfs image into ram. So your thin client is totally diskless ? No hard drive at all ? And you plan to load your squashfs image from server or usb stick or from where ? Stefan 24.1.2013 21:29, Stephen Turner kirjoitti: > > 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" > wrote: > > On 01/22/13 13:41, Stefan Fr?berg wrote: > [snip] > > My /etc/fstab look like this > # /etc/fstab: static file system information. > # > # > /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 > GPG fingerprint: 7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F > -------------- next part -------------- An HTML attachment was scrubbed... URL: