linux-kernel - Re: Issues with capability bits and meta-data in kdbus

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Message-ID: <20150423083859.GA5277@dellaz>
Date:	Thu, 23 Apr 2015 10:38:59 +0200
From:	Michele Curti <michele.curti@...il.com>
To:	Havoc Pennington <hp@...ox.com>
Cc:	Austin S Hemmelgarn <ahferroin7@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Jiri Kosina <jkosina@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: Issues with capability bits and meta-data in kdbus

On Wed, Apr 22, 2015 at 04:02:34PM -0400, Havoc Pennington wrote:
> On Wed, Apr 22, 2015 at 10:35 AM, Michele Curti <michele.curti@...il.com> wrote:
> >
> > Just out of curiosity, would you like to change something in dbus design,
> > if you didn't have to worry about ABI breaks and the like?
> >
> 
> Good question. I can't remember any big-picture things, I'm sure the
> current maintainers and users have a longer list. :-) There are a
> variety of little small things, some examples I can immediately think
> of:
> 
>  * the ad hoc authentication protocol is sort of ugly
>  * the byte order marker in every message is silly
>  * protocol version in every message is useless
>  * Ryan Lortie's nice fixes in GVariant, which I think kdbus adopts (
> https://people.gnome.org/~ryanl/gvariant-serialisation.pdf ), for the
> most part these are 'cleanups' but nullable types ("maybe" types for
> Haskell fans) are a notable semantic addition
>  * specify how it works on Windows, the Windows port last I checked
> (years ago) didn't do things in a Windows-sensible way
>  * specify what happens when resource limits are reached
>  * wouldn't use XML for introspection data these days
> http://dbus.freedesktop.org/doc/dbus-specification.html#introspection-format
>

Nice, thanks!

It seems that all of these are userspace related only.  Yes I saw a "gvariant
readme" in systemd sources, now I understood what it is (I'm not an expert) :D 

My only fear was that kdbus was trying to keep something that even dbus himself
don't want.  But it seems that this is not the case.

Thanks, regards,
Michele

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