linux-kernel - Re: [RFC v2 3/4] backports: use BACKPORT

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Message-ID: <20141031200316.GC12953@wotan.suse.de>
Date:	Fri, 31 Oct 2014 21:03:16 +0100
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	backports@...r.kernel.org, linux-kernel@...r.kernel.org,
	yann.morin.1998@...e.fr, mmarek@...e.cz, sassmann@...nic.de
Subject: Re: [RFC v2 3/4] backports: use BACKPORT_DIR prefix on kconfig
	sources

On Fri, Oct 31, 2014 at 08:46:02AM +0100, Johannes Berg wrote:
> On Wed, 2014-10-29 at 01:21 -0700, Luis R. Rodriguez wrote:
> 
> >  src_line = re.compile(r'^\s*source\s+"?(?P<src>[^\s"]*)"?\s*$')
> > +bk_src_line = re.compile(r'^\s*source\s+"?\$BACKPORT_DIR/(?P<src>[^\s"]*)"?\s*$')
> >  tri_line = re.compile(r'^(?P<spc>\s+)tristate')
> >  bool_line = re.compile(r'^(?P<spc>\s+)bool')
> >  cfg_line = re.compile(r'^(?P<opt>config|menuconfig)\s+(?P<sym>[^\s]*)')
> > @@ -21,23 +22,47 @@ class ConfigTree(object):
> >          yield f
> >          for l in open(os.path.join(self.basedir, f), 'r'):
> >              m = src_line.match(l)
> > -            if m and os.path.exists(os.path.join(self.basedir, m.group('src'))):
> > -                for i in self._walk(m.group('src')):
> > -                    yield i
> > +            if m:
> > +                bm = bk_src_line.match(l)
> > +                if bm:
> > +                    if os.path.exists(os.path.join(self.basedir, bm.group('src'))):
> > +                        for i in self._walk(os.path.join(self.basedir, bm.group('src'))):
> > +                            yield i
> > +                    elif os.path.exists(os.path.join(self.basedir, 'backports/' + bm.group('src'))):
> > +                        for i in self._walk(os.path.join(self.basedir, 'backports/' + bm.group('src'))):
> > +                            yield i
> > +                else:
> > +                    if os.path.exists(os.path.join(self.basedir, m.group('src'))):
> > +                        for i in self._walk(m.group('src')):
> > +                            yield i
> 
> Are you even using the src_line regular expression any more? Seems like
> you could just modify it though to make the (\$BACKPORT_DIR/) part
> optional.

Sure make sense. I suppose we should be consistant too and use $BACKPORT_DIR.

> >      def _prune_sources(self, f, ignore):
> >          for nf in self._walk(f):
> >              out = ''
> >              for l in open(os.path.join(self.basedir, nf), 'r'):
> > -                m = src_line.match(l)
> > -                if not m:
> > -                    out += l
> > -                    continue
> > -                src = m.group('src')
> > -                if src in ignore or os.path.exists(os.path.join(self.basedir, src)):
> > -                    out += l
> > +                bm = bk_src_line.match(l)
> > +                if bm:
> > +                    bp_src = bm.group('src')
> > +                    if bp_src in ignore or \
> > +                       os.path.exists(os.path.join(self.basedir, bp_src)) or \
> > +                       os.path.exists(os.path.join(self.basedir, 'backports/' + bp_src)):
> 
> I'd prefer parentheses instead of \ line continuations :)

OK :)

> the backports/ part seems to be for integration only?

I think I went trigger happy since the bk_src_line should have picked
up on the fact that backports directory prefix would already have been
used. I'll re-test and remove not needed thing and try to consolidate
the regexp.

> > +                    m = src_line.match(l)
> > +                    # we should consider disallowing these as it could mean
> > +                    # someone forgot to add the BACKPORT_DIR prefix to
> > +                    # the kconfig source entries which we will need to
> > +                    # support built-in integration.
> 
> If you put it in the same RE then you can just print a warning on this
> if detected but skip it otherwise.

What I meant by this was more of the things that could go into a Kconfig
which we perhaps are not parsing yet which might depend on a path, so
its not clear to me what regexp to use. Right now it will just leave
the lines intact and I guess that's fine for now.

  Luis
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