[oe] Proposed rebuild task fix

[Richard Purdie]

On Sun, 2008-04-27 at 00:02 +0100, Richard Purdie wrote:
> As mentioned recently the rebuild task has issues. The attached patch is
> the fix I'd like to propose for this. It adds a "setscene" task which
> runs before fetch and does housekeeping style activities like cleaning
> up work areas. I've written it so the existing packaged-staging
> "do_prepackaged_stage" task is also brought under the umbrella of this
> new task. One useful advantage to this is you can then enable/disable
> packaged staging within a given build and it won't rebuild everything
> which is a drawback of the current setup.
> 
> The main drawback to this proposed change is that it will force a full
> rebuild of everything equivalent to a 'wipe tmp/'.

I've just committed this. People should be aware this will cause an
effective rebuild and anyone wishing to avoid that should not upgrade
until its more convenient.

Regards,

Richard