[oe] /usr merge, stateless systems and atomic updates w/ OpenEmbedded?

[Leon Woestenberg]

Hi Jussi,

thanks. The folks at Automotive Grade Linux (AGL) seem to use 2) in a
working proof-of-concept order to support OSTree-based (bare-mode) rootfs
updates in Yocto / OpenEmbedded Core but I am not aware of any package
fix-ups.
The links are created in their image generation step. (*)

I was test driving with 2) as well, but I think 1) is the cleaner approach
in the longer run. I would be glad to help out fixing/testing, as I am
interested in getting OSTree/usrmerge/stateless combo going on OE.

Stateless is indeed another beast, as is OSTree support (*).

Regards,

Leon.

(*) https://github.com/advancedtelematic/meta-updater



On Mon, Jan 16, 2017 at 1:52 PM, Jussi Kukkonen <jussi.kukkonen at intel.com>
wrote:

> On 15 January 2017 at 01:41, Leon Woestenberg <leon at sidebranch.com> wrote:
>
> > Hello Khem,
> >
> > I know outside of OE it is more and more common place, such as Project
> > Atomic.
> >
> > Re-reading some of the material I have found, I found that Chen Qi of
> Wind
> > River had something going.
> >
> > http://lists.openembedded.org/pipermail/openembedded-core/
> > 2014-December/099616.html
> >
> > >* > Several days ago, I tried to do /usr merge in OE (like what Fedora
> and
> > *>* > Arch does). It turned out that we need to patch several packages to
> > make
> > *>* > things work.
> > *>* >
> > *>* > (I haven't sent out the patches because it's just some initial
> > *>* > investigation and I'm not sure if people want this feature or not.)
> > *>* >
> > *>* > If you want this feature in OE, please open a bug/enhancement in
> > *>* > bugzilla https://bugzilla.yoctoproject.org/
> > <https://bugzilla.yoctoproject.org/> to see if the community
> > *>* > wants it or not.
> > *>* >
> > *>* > Regards,
> > *>* > Chen Qi*
> >
> > and in Yocto an enhancement is going for usrmerge:
> > https://bugzilla.yoctoproject.org/show_bug.cgi?id=7040
>
>
> Hi Leon,
>
> Me and Amarnath Valluri have been testing "merged /usr" this month: I
> expect there will be a oe-core patchset for review later this week -- I'll
> CC you when that happens.
>
> The possible approaches seem to be:
>  1) Modify $base_bindir (et al) so that all recipes actually install under
> /usr/, fix recipes that misbehave
>  2) Don't modify $base_bindir (et al), just make sure the symlinks (like
> /bin -> /usr/bin) are there when packages are installed on the rootfs
>
> Both approaches have some package management related issues but can be made
> to work (we're leaning towards #1 at the moment).
>
> I'm not promising anything about Stateless yet.
>
> Jussi
> --
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