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

Randy Dunlap
2011-02-04T22:35:40Z

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@gmail.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.

2. My first test (using your ex1.py script) failed because I used O=xx64 (build
directory):

rddunlap@chimera: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.

Thanks. I'll keep looking...

---
~Randy
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