[bitbake-devel] [PATCH] runqueue: Add output for -S option for listing the changepoints compared with an sstate cache

[Martin Jansa]

On Mon, Jan 27, 2014 at 01:23:25PM +0000, Richard Purdie wrote:
> On Tue, 2014-01-21 at 22:37 +0000, Richard Purdie wrote:
> > I appreciate its taken me a while to loop back around on this but I do
> > now have an idea. What I'm proposing we do is add an optional parameter
> > to -S. Without any parameter it would behave as it did classically.
> > 
> > With a parameter, it could trigger the current "debug sstate" behaviour
> > to stdout and it also allows it to trigger an sstate siggen specific
> > behaviour as appripriate. I have some prototype code with writes out a
> > "locked-sigs.inc" file for example, triggered from this same code block.
> > 
> > I think this should let us do more creative things with sstate (even
> > from the OE siggen class) yet also let it remain useful for different
> > people.
> 
> So we have a small potential issue here. We use python's optparse which
> doesn't allow optional arguments. This means we can make -S take options
> but the options must always be specified.
> 
> It has good reason for this as its near impossible for optparse to tell
> the difference between:
> 
> bitbake image -S tracesigs
> and
> bitbake image -S image2
> 
> So our options are:
> 
> a) Require a new parameter to -S always
> b) Hack it to use the option after -S as a parameter (meaning -S should
> always be last on the commandline). I do have a proof of concept but it
> makes me uneasy
> c) Add a new option with a different name
> 
> In the interests of not doing something which binds us into a problem in
> future, I'm thinking -S should start to always take a parameter. The
> only issue is I'd like that parameter to be metadata (siggen) definable
> so we can't validate the option passed.
> 
> Any opinions?

What about using some existing parameter in combination with -S?

-S + -v shows tracesigs
-S without -v old behavior

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
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