[arch-releng] updates to releng scripts for new dm_snapshot archiso

Gerardo Exequiel Pozzi vmlinuz386 at yahoo.com.ar
Tue Aug 9 16:06:12 EDT 2011

----- Mensaje original -----
> De: C Anthony Risinger <anthony at xtfx.me>
> Para: Arch Linux Release Engineering <arch-releng at archlinux.org>
> CC: 
> Enviado: martes, 9 de agosto de 2011 16:48
> Asunto: Re: [arch-releng] updates to releng scripts for new dm_snapshot archiso
> On Sat, Aug 6, 2011 at 11:35 AM, Thomas Bächler <thomas at archlinux.org> 
> wrote:
>>  Btw, with these ISOs, you can do this:
>>  1) Copy the /arch folder from any of the ISOs to the root of any USB
>>  drive (stick must be vfat, ext2/3/4 or btrfs)
>>  2) Run 'extlinux -i $PATH_TO_USB/arch/boot/syslinux/'
>>  3) Run 'sed 's|ARCH_201108|filesystemlabeloftheusb|' -i
>>  $PATH_TO_USB/arch/boot/syslinux/*.cfg
>>  4) Install MBR to the USB and mark the partition active
>>  After these steps, you have a bootable USB without overwriting your
>>  whole USB with dd. Just did that to my USB drive again, so I have an
>>  up-to-date Arch system on it.
> nice ... very cool!  tried this last night to fix a btrfs prob i was having.
> maybe it was obvious (i didn't spend much time investigating), but
> once inside, is there simple access to the boot partition?  IOW, if i
> put the /arch directory on a USB stick with a single partition, how
> can i get access to the rest of the partition/FS and it's free space?
> would 2 partitions be the only clear way ATM?  since the boot
> partition is already mounted and im assuming the loopback images
> mounted over the top i'd think the original partition would need to be
> --bind mounted ... i know btrfs can be mounted multiple times but i
> dont know about ext* (i put mine on ext4 ... i mean i WAS fixing a
> btrfs problem after all :-).  i could possibly reach in thru
> /proc/1/cwd but that's a bit hacky ...

if you have other partitions just mount it.

You can mount the same filesystem on differents locations without bind mounts. This is a VFS feature.

> ... it would be super cool if there was a way to make updates
> persistent, eg. an overlay file that existed on the remainder of the
> original FS or something that the init process could detect (or a
> passed param).  i *know* i did this with ubuntu at one time, but i
> cant remember the tool that produced said USB image ...

I will send some changes that cow files are stored on real device instead of tmpfs.
I expect to be accepted. Not really useful for official images, but for custom images can get benefit from it.

But for better support I am wating for next initscripts/mkinitcpio for clean shutdown.

> -- 
> C Anthony

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