progress with bundled C libraries

[Dan Williams]

On Mon, 2006-11-06 at 12:11 +0100, Bert Freudenberg wrote:
> Sounds good. Maybe we even want to add this to the default bundle  
> layout and Activity code? That way it would just work for other  
> activities to put their libs into <bundle>/lib without worrying about  
> how this will be accomplished ...

That's a good suggestion; activities could always override this with a
custom RPATH if they really want to.

Dan

> - Bert -
> 
> Am 06.11.2006 um 02:15 schrieb Owen Williams:
> 
> > I think I've solved the problem of bundled libraries on OLPC.
> >
> > Summary of problem:
> > Activities are expected to bundle their own libraries, but activities
> > can't know where they will be installed.  Also, activities never  
> > have a
> > chance to set LD_LIBRARY_PATH, so how can they link to their  
> > libraries?
> >
> > Solution:
> > Set up a relative RPATH inside the python modules that link to the C
> > libraries.
> >
> >
> > For instance, I use the pycurl library which is a python module that
> > links to the C library libcurl.  I can append to sys.path to tell  
> > python
> > where pycurl is, but I can't do something similar with libcurl.
> >
> > However, If I compile pycurl and set runtime_library_dirs=['./ 
> > lib'], and
> > then os.chdir to my activity directory on load, the libraries link up
> > and everyone's happy.  I don't have a complete working bundle, but
> > initial tests are promising.
> >
> > In my PenguinTVActivity module, I do this:
> > try:
> >  #try the import because hey, it might work
> >  import pycurl
> > except:
> >  #yeah, well, what did we expect
> >  logging.warning("Trying to load bundled pycurl libraries")
> > 	
> >  #import ourselves
> >  import PenguinTVActivity
> >
> >  #where the hell are we?
> >  activity_root = os.path.split(PenguinTVActivity.__file__)[0]
> >
> >  #change to that folder, so that RPATH="./lib" will work
> >  os.chdir(activity_root)
> >
> >  #also append to sys.path so modules load
> >  sys.path.append(os.path.join(activity_root, 'site-packages'))
> >
> >  #try again.  if it fails this time, it fails.
> >  import pycurl
> >
> > I'm downloading FC6 now to install in a vmware image, so tomorrow I
> > should be able to build my own modules and test this for sure.
> >
> > Owen
> >
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> 
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