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 ...
- 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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