Re: [Duplicity-talk] Can't find _librsync?

[Scott Hannahs]

On Nov 22, 2009, at 5:48 PM, Kenneth Loafman wrote:

> Scott Hannahs wrote:
>> Mac OS X 10.6 and Python 2.6
>> 
>> I have beat my head on this a bit and seem not to be able to figure out why 
>> duplicity can't find this library.  Duplicity seems to be looking for the 
>> library _librsync which as far as I can tell does not exist.  This is called 
>> from the librsync.py which does exist.  When I run duplicity I get the 
>> following traceback:
>> 
>> % export PYTHONPATH=/usr/local/lib/python2.6/site-packages:/sw/lib/
>> % /usr/local/bin/duplicity --encrypt-key XXXXXXXX --sign-key YYYYYYYY 
>> --gpg-options='--default-key=ZZZZZZZZ' $HOME/Documents/ 
>> file:///tmp/Documents/
>> Traceback (most recent call last):
>>  File "/usr/local/bin/duplicity", line 41, in <module>
>>    from duplicity import collections
>>  File "/usr/local/lib/python2.6/site-packages/duplicity/collections.py", 
>> line 29, in <module>
>>    from duplicity import path
>>  File "/usr/local/lib/python2.6/site-packages/duplicity/path.py", line 33, 
>> in <module>
>>    from duplicity import librsync
>>  File "/usr/local/lib/python2.6/site-packages/duplicity/librsync.py", line 
>> 37, in <module>
>>    blocksize = _librsync.RS_JOB_BLOCKSIZE
>> NameError: name '_librsync' is not defined
>> 
>> I have set the PYTHONPATH variable and if I check, it seems that /sw/lib is 
>> in my path correctly if I print sys.path.
>> 
>> At /sw/lib exist both librsync.a and librsync.dylib
>> 
>> Just for completeness here is the build command for duplicity that I use to 
>> reference the librsync that I installed with fink.
>> 
>> sudo python setup.py install --prefix=/usr/local --librsync-dir=/sw
> 
> Have you tried a normal install without specifying the prefix and
> librsync options?  That should work.  There are a lot of complications
> when trying to use other than the default Python install options, mainly
> with the PYTHONPATH settings.  It's just not worth the hassle.
> 
> In addition, to compile librsync correctly you will need the module
> librsync-dev from the repositories.

If I try without the options, then the build process can't find the librsync.h 
file

_librsyncmodule.c:26:22: error: librsync.h: No such file or directory

Which is reasonable, since I installed my librsync and header files in 
/sw/include and /sw/lib.  I had used this build on an earlier version of 
duplicity 0.5.X and it had worked.

If I just use the --librsync-dir=/sw option then it builds correctly and finds 
all the libraries.  It just can't seem to load it again at run time.

With PYTHONPATH="" it gives the error above.  With PYTHONPATH set to all the 
directories
PYTHONPATH=/usr/local/lib/python2.6/site-packages:/usr/local/lib/python2.6/site-packages/duplicity:/sw/lib

I get the NameError
NameError: name '_librsync' is not defined

If I just open python and manually load it, it is the same.
>>> import librsync
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.6/site-packages/duplicity/librsync.py", line 37, 
in <module>
    blocksize = _librsync.RS_JOB_BLOCKSIZE
NameError: name '_librsync' is not defined
>>> 

If I manually try to load _librsync it complains about a missing link.  So it 
seems to find the file but has an error with _rs_file_copy_cb

>>> import _librsync
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: 
dlopen(/usr/local/lib/python2.6/site-packages/duplicity/_librsync.so, 2): 
Symbol not found: _rs_file_copy_cb
  Referenced from: /usr/local/lib/python2.6/site-packages/duplicity/_librsync.so
  Expected in: flat namespace
 in /usr/local/lib/python2.6/site-packages/duplicity/_librsync.so
>>> 

So it seems that python can find the file after all, but the missing routine 
error is causing it to skip the load step and continue on in the try/fail flow 
structure with librsync.py

I am using version 0.9.7-1003 of librsync.  Is this a problem?

Scott