linux-kernel - Re: [PATCH] [ANNOUNCE] kconfig: Kconfiglib: a flexible Python Kconfig parser

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Date:	Sat, 5 Feb 2011 01:28:42 +0100
From:	Ulf Magnusson <ulfalizer.lkml@...il.com>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	linux-kbuild@...r.kernel.org, zippel@...ux-m68k.org,
	mmarek@...e.cz, akpm@...ux-foundation.org,
	andrea.gelmini@...ma.net, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH] [ANNOUNCE] kconfig: Kconfiglib: a flexible Python
 Kconfig parser

On Fri, Feb 04, 2011 at 02:35:29PM -0800, Randy Dunlap wrote:
> On Wed, 2 Feb 2011 00:27:55 +0100 Ulf Magnusson wrote:
> 
> > Hi,
> > 
> > This is the initial release of Kconfiglib: a Python library for
> > scripting, debugging, and extracting information from Kconfig-based
> > configuration systems.  It can be used to programmatically generate a
> > .config when the '*conf' tools are too inflexible, to quickly find out
> > interesting information about a Kconfig configuration such as dependency
> > relations between symbols and where undefined symbols are referenced,
> > and in applications that need to parse and extract information from
> > Kconfig files.
> > 
> > For a much longer introduction including multiple examples, see
> > arch/kconfig/kconfiglib.py.
> > 
> > Have fun!
> > 
> > Signed-off-by: Ulf Magnusson <ulfalizer.lkml@...il.com>
> > ---
> > Convenience links:
> > 
> > Documentation, generated from kconfiglib.py with pydoc -w:
> > http://dl.dropbox.com/u/10406197/kconfiglib.html
> > 
> > Examples as separate files:
> > http://dl.dropbox.com/u/10406197/kconfiglib-examples.tar.gz
> > 
> > 
> > The patch should be preferably be applied to a recent kernel, i.e. Linus's
> > (2.6.38-rc3 at the time of writing).  Due to recent Kconfig changes, the
> > kconfigtest.py test suite - which compares output character-for-character -
> > will indicate failure on older (a few months old) kernels versions even though
> > the outputs are functionally equivalent.
> > 
> >  Documentation/kbuild/kconfig-language.txt |    5 +
> >  Documentation/kbuild/kconfig.txt          |    8 +
> >  README                                    |   13 +
> >  scripts/kconfig/Makefile                  |   26 +-
> >  scripts/kconfig/kconfiglib.py             | 3918 +++++++++++++++++++++++++++++
> >  scripts/kconfig/kconfigtest.py            |  396 +++
> >  6 files changed, 4365 insertions(+), 1 deletions(-)
> >  create mode 100644 scripts/kconfig/kconfiglib.py
> >  create mode 100644 scripts/kconfig/kconfigtest.py
> > 
> 
> > diff --git a/README b/README
> > index 1b81d28..bb5e68f 100644
> > --- a/README
> > +++ b/README
> > @@ -196,6 +196,19 @@ CONFIGURING the kernel:
> >  			   values to 'n' as much as possible.
> >  	"make randconfig"  Create a ./.config file by setting symbol
> >  			   values to random values.
> > +	"make scriptconfig SCRIPT=<path to script>" Run a Kconfiglib
> > +			   script (see scripts/kconfig/kconfiglib.py).  This
> > +			   can be used to programatically generate a
> > +			   ./.config, and for applications that need to
> > +			   extract information from Kconfig files.
> > +	"make iscriptconfig" Launch an interactive Python shell
> > +			   for running Kconfiglib on the architecture's
> > +			   Kconfig configuration.  The kconfiglib and sys
> > +			   (for sys.argv[1] - the base Kconfig file) modules
> > +			   will be imported automatically, and a Config
> > +			   instance 'c' will be created for the architecture
> > +			   (using c = kconfiglib.Config(sys.argv[1])).
> > +
> >  
> >     You can find more information on using the Linux kernel config tools
> >     in Documentation/kbuild/kconfig.txt.
> 
> Hi Ulf,
> 
> This is interesting.  I just wish I could read it.  ;)
> I'll get over it.
> 
> 
> 1.  It would be really Good to have "make scriptconfig SCRIPT=<path to script>"
> and "make iscriptconfig" (similar to above, but shortened) in "make help" output.

I have added short descriptions to "make help", mostly referring people
to the script itself. Do you think I should explain it more fully? I
felt bad about adding big blobs of text when the "make help"
descriptions for all the other *config targets are short oneliners :)

> 
> 2.  My first test (using your ex1.py script) failed because I used O=xx64 (build
> directory):
> 
> rddunlap@...mera:lnx-2638-rc3> make O=xx64 scriptconfig SCRIPT=~/pkg/kconfiglib/ex1.py
>   GEN     /lnx/src/lnx-2638-rc3/xx64/Makefile
> Traceback (most recent call last):
>   File "/home/rddunlap/pkg/kconfiglib/ex1.py", line 1, in <module>
>     import kconfiglib
> ImportError: No module named kconfiglib
> make[2]: *** [scriptconfig] Error 1
> make[1]: *** [scriptconfig] Error 2
> make: *** [sub-make] Error 2
> 
> Does kconfiglib support O=builddir generally?  I can't tell that it does (yet)
> since all ex[1-7].py fail in this manner.
> It needs to support/allow O=builddir.

I hadn't considered O. I'll see if I can cook up a patch.

/Ulf
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