[NeXus-code-tickets] [NeXusCode] #347: napi.py may fail to find libNeXus.so.0 although it was installed with it

[NeXus Data Format Library and Applications]

#347: napi.py may fail to find libNeXus.so.0 although it was installed with it
-----------------------------+------------------------
 Reporter:  Tobias Richter   |      Owner:  Unassigned
     Type:  defect           |     Status:  new
 Priority:  major            |  Milestone:
Component:  python bindings  |    Version:  4.3.0
 Keywords:                   |
-----------------------------+------------------------
 Rolf Krahl reports:

 ====================================================
 Symptom
 -------

 Even trivial Python programs using the NeXus API fail with an error
 message that libNeXus.so.0 cannot be found:

 $  python -c "import nxs"
 Traceback (most recent call last):
   File "<string>", line 1, in <module>
   File "/usr/lib64/python2.7/site-packages/nxs/__init__.py", line 20, in
 <module>
     from nxs.napi import *
   File "/usr/lib64/python2.7/site-packages/nxs/napi.py", line 268, in
 <module>
     nxlib = _init()
   File "/usr/lib64/python2.7/site-packages/nxs/napi.py", line 263, in
 _init
     lib = _libnexus()
   File "/usr/lib64/python2.7/site-packages/nxs/napi.py", line 260, in
 _libnexus
     raise OSError, "Set NEXUSLIB or move NeXus to one of: %s"%(",
 ".join(files))
 OSError: Set NEXUSLIB or move NeXus to one of: /usr/lib64/python2.7/site-
 packages/nxs/libNeXus.so.0, /usr/lib/libNeXus.so.0,
 /usr/local/lib/libNeXus.so.0, /usr/lib/libNeXus.so.0


 Analysis
 --------

 The NeXus API searches its lib in the following places in order:

  - os.environ['NEXUSLIB']
  - directory containing napi.py
  - os.environ['LD_LIBRARY_PATH']
  - PREFIX/lib
  - /usr/local/lib
  - /usr/lib

 where PREFIX is set by configure during install, /usr in my case.  The
 directory containing napi.py was /usr/lib64/python2.7/site-packages/nxs
 here.  The environment variables NEXUSLIB and LD_LIBRARY_PATH have not
 been set.  This boils the search patch down to
 /usr/lib64/python2.7/site-packages/nxs, /usr/lib, /usr/local/lib,
 /usr/lib.

 But the lib has been installed as /usr/lib64/libNeXus.so.0 by make
 install and that is exactly the place where it should be on a 64 bit
 system.  So napi.py should have looked in /usr/lib64.


 Suggested fix
 -------------

 Rather then in PREFIX/lib, /usr/local/lib, /usr/lib, napi.py should
 look in LIBDIR as set by configure.  That is the directory where it
 gets installed by make install.  See the attached patch.
 ====================================================

 That attached patch didn't apply correctly for me. So I'll commit it to
 this ticket.

-- 
Ticket URL: <http://trac.nexusformat.org/code/ticket/347>
NeXus Data Format Library and Applications <http://www.nexusformat.org/>
NeXus Data Format Library and Applications