Re: [gentoo-dev] Re: udev <-> mdev

[Ian Stakenvicius <axs@gentoo.org>]

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On 15/07/12 09:00 PM, Maxim Kammerer wrote:
> On Mon, Jul 16, 2012 at 3:30 AM, Duncan <1i5t5.duncan@cox.net>
> wrote:
>> Thinking in that direction does stimulate yet another idea, tho.
>> What about a squashfs root?  AFAIK squashfs is read-only at use
>> time, thus enforcing actually mounting something else to write
>> anything, eliminating many of the down sides of sticking with the
>> initial ramfs root, but it would allow the same flexibility in
>> terms of sticking whatever into it at create-time, while only
>> taking the memory necessary for what's actually stuck in it at
>> create-time.
> 
> It is possible, see: 
> https://github.com/mkdesu/liberte/blob/master/src/root/initrd/init 
> https://github.com/mkdesu/liberte/blob/master/src/etc/fstab
> 
> The setup above is somewhat different from what you have in mind 
> (SquashFS image is located on disk, and contains the complete live 
> filesystem, not just a skeleton), so mounting read-writable
> branches can be deferred to the regular post-initramfs services
> (such as localmount) — on the other hand, maybe you want to do the
> same (mount branches read-only in initramfs, and remount them
> read-write in an init.d service).
> 

...if going this route, why not simply not bother to pivot_root out of
the initramfs at all?  or pivot_root but only into a directory
structure still sitting in the initramfs?  As long as all non-root
bits are in separate storage, you can mount 'em all in the appropriate
place...


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