[OE-core] Consistency and use cases for IMAGE_FSTYPES

[Tom Rini]

On Fri, Mar 23, 2012 at 01:14:24AM +0000, Richard Purdie wrote:
> On Thu, 2012-03-22 at 19:53 -0400, Denys Dmytriyenko wrote:
> > On Thu, Mar 22, 2012 at 11:26:24PM +0000, Richard Purdie wrote:
> > > On Fri, 2012-03-09 at 14:39 -0700, Tom Rini wrote:
> > > > Hey all,
> > > > 
> > > > Over in meta-ti I kicked off a discussion
> > > > (https://lists.yoctoproject.org/pipermail/meta-ti/2012-March/000779.html)
> > > > about if we should be using '?=' or '+=' with IMAGE_FSTYPES in the
> > > > machine conf files.  This has been discussed a little bit before
> > > > (http://thread.gmane.org/gmane.comp.handhelds.openembedded.core/2060/focus=2061).
> > > >  The problem is we have the following and I believe ultimately
> > > > conflicting use cases:
> > > 
> > > I've been under the impression that we decided upon:
> > > 
> > > > - The machine needs to say 'I need or support the following formats'
> > > 
> > > so the machine starts and sets:
> > > 
> > > IMAGE_FSTYPES = "xxxx"
> > > 
> > > > - The distro needs to say 'I always want format X'
> > > 
> > > so the distro can do:
> > > 
> > > IMAGE_FSTYPES += " yyy"
> > > 
> > > > - The user needs to say 'I know best, give me only format X'
> > > 
> > > So the user can do:
> > > 
> > > IMAGE_FSTYPES = "X"
> >
> > Since local.conf gets parsed before machine.conf and distro.conf, the user 
> > needs to do this override:
> > 
> > IMAGE_FSTYPES_local = "X"
> > 
> > Otherwise machine.conf will always overwrite it with "xxxx" with its 
> > unconditional assignment.
> 
> Right, I'd forgotten that little detail :/.
> 
> It actually makes me wonder if our include order is the right one but
> now isn't the time to try changing that.
> 
> I agree the neatest way to change it is probably something like
> MACHINE_FSTYPES. I do worry a lot about backwards compatibility though
> and I'd also point out where we're at in the release cycle (bug fix
> only).

Well, one problem that would make this a bugfix is that no one does what
you say we agreed on today.  oe-core has qemu.inc using ?=, meta-intel
is using += and meta-ti is mixed (which is what got this started).

-- 
Tom
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