Re: [RFC v2 3/4] backports: use BACKPORT_DIR prefix on kconfig sources

[Johannes Berg <johannes@sipsolutions.net>]

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.

>      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 :)

the backports/ part seems to be for integration only?

> +                    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.

johannes