[olpc-help] clarifying how to restore

[Michael Stone]

Timothy,

When your system boots, it boots into either a 'primary' or an
'alternate' image. These images are stored in places like
'/versions/run/650' and '/versions/run/<some_hash>'.  

They contain the entire filesystem except for the contents of /home and
/security, which live elsewhere and are bind-mounted into place during
the system boot sequence.

(To support a future feature called P_SF_RUN, we also keep 'pristine'
copies of the filesystem at /versions/pristine/*. Originally, these
trees were kept pristine with a 'copy-on-write link-breaking' annotation
which, due to some unforseen filesystem interactions, was withdrawn
pending a rewrite.)

Let me know if you'd like more details.

Michael


On Wed, Jan 09, 2008 at 11:56:18AM -0500, Chih-yu Chao wrote:
> Hi Timothy,
> 
> On Jan 9, 2008 11:30 AM, tdang <community-support at lists.laptop.org> wrote:
> >
> > Hi Chih-yu
> >
> > I got my guidance from http://www.hackszine.com/blog/archive/2008/01/howto_upgrade_the_xo_laptops_o.html
> 
> Just for future reference, the OLPC team are actively updating the
> official FAQ page on a daily basis:
> http://wiki.laptop.org/go/Support_FAQ
> You can get the latest, workable solutions there. :)
> 
> 
> > ...but I only used a tiny part of that. I updated by:
> >
> >
> > Code:
> >
> > su -
> > olpc-update 653
> >
> >
> >
> >
> > Very simple. Is the trouble that olpc-update replaces everything with 653?
> 
> Performing olpc-update 653 should not do harm to the previously
> installed image (i.e. build 650). Power up the machine by holding down
> the O key of the game pad (locate it under the right speaker). This
> should bring you back to build 650.
> 
> > Here's another thing I'm not clear on. When talking about having alternate and/or pristine versions of the OS, does that include Sugar? The changes I was making were in /usr/share/sugar/shell/view/home. I don't know if that falls under OS for these purposes or not.
> 
> I am not sure about this. Could someone on the forum/mailing list
> answer this question? :)
> 
> Thanks a lot!
> Chih-yu
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