I thought the idea was that minor updates would go out as normal (taking
up space on the r/w partition), and then there would be a mechanism to
do system updates where everything on sda1 is replaced (boot kernel,
initrd, rootfs.img). This would require a bit more separation of the
rootfs.img and some intelligent upgrade scripts, but it is a doable
solution. Part of this would involve 3rd party app installs to be
located separately from the OS image area. Normally this is done by
using /usr/local, but it could also involve installing into /home/ume.
Either location should be on the r/w partition only anyways.
Also, is there a reason not to create subdirectories on the r/w
partition for various things, like a /home directory and a /changes
directory that mirrors the rootfs?
Directories that shouldn't be in the rootfs (imo) include:
/var
/tmp
/home
/usr/local
They may need to exist in the rootfs.img, but should be blank. Of
course this creates an issue with the apt cache, but that can be solved
with a first-boot script that unarchives the appropriate files to the
r/w partition.
This is just my opinion of how this should work. As I am apparently
human (my wife says otherwise), it is subject to error.
Tobin
On Wed, 2008-04-30 at 21:01 +0200, Loïc Minier wrote:
> On a related topic, I was hit by #224754 today where you can't upgrade
> sudo under unionfs (or any package shipping hard links). That's a very
> serious concern to me (dpkg crashes, kernel oopses, system breaks
> horribly).
>
> Also, we have a huge issue: all the security / stable updates will eat
> more and more space on the r/w part of the partition... For example,
> if you upgrade package foo, both the old files and the new files will
> eat space forever (one time compressed in the squashmnt, and one time
> uncompressed in the persistmnt).
>
> So either we release with unionfs, make the space commitments but run
> into tons of bugs and get a time bomb with upgrades eating space over
> time. Or we switch to ext3, and probably fail the space commitments,
> but we get better performances and less wasted space.
>
> --
> Loïc Minier
>
--
Tobin Davis
How many surrealists does it take to screw in a lightbulb?
One to hold the giraffe and one to fill the bathtub with brightly colored
power tools.
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