[OE-core] Create more than one image with WIC

[Ed Bartosh]

On Wed, Mar 15, 2017 at 08:24:34AM +0100, Patrick Ohly wrote:
> On Tue, 2017-03-14 at 20:06 +0200, Ed Bartosh wrote:
> > On Tue, Mar 14, 2017 at 06:49:45PM +0100, Patrick Ohly wrote:
> > > 
> > > > It's not a big deal to run wic sequentially to produce multiple images,
> > > > but it will create more problems than it solves I believe. It will be slower and
> > > > will make a mess in image naming in deploy directory.
> > > 
> > > I personally would prefer to support generating more than one wic image
> > > per image recipe. The different output files could be distinguished with
> > > an additional suffix (".efi.wic", ".live.wiC", etc.) where the suffix is
> > > either specified by the WKS file or the configuration where the WKS file
> > > is selected - the latter might be a bit more flexible.
> > >
> > 
> > From my point of view ths would be against the current design of oe
> > image building susbsystem. It would be also more complex and slower
> > unless we'll find a way to dynamically generate multiple image creation
> > tasks per one recipe and run them in parallel. In this case it will be
> > even more complex.
> 
> That's a good point. However, directly sharing the content of the build
> directory from different recipes is also against the OE design and
> requires special attention, for example to suppressing the do_rootfs
> task in one recipe and preventing do_rm_work in the other.
> 
> Either way, something that works out of the box might be useful.

I'm going to address this in near future when I'll be working on
https://bugzilla.yoctoproject.org/show_bug.cgi?id=10073
Feel free to comment on it, btw.

So far the plan is to treat EFI boot partition as a rootfs. wic job
would be to simply put content of multiple rootfs-es into partitions of
the final image. No suppressing of do_rootfs would be needed, I hope.

Regarding do_rm_work. It should not touch rootfs directories, I believe.

--
Regards,
Ed