libgfchangelog : use find_library to locate shared library

Issue:

libgfchangelog.so: cannot open shared object file

Due to hardcoded shared library name runtime loader looks for particular version of
a shared library.

Solution:

Using find_library to locate shared library at runtime solves this issue.

Traceback (most recent call last):
  File "/usr/libexec/glusterfs/python/syncdaemon/gsyncd.py", line 323, in main
    func(args)
  File "/usr/libexec/glusterfs/python/syncdaemon/subcmds.py", line 82, in subcmd_worker
    local.service_loop(remote)
  File "/usr/libexec/glusterfs/python/syncdaemon/resource.py", line 1261, in service_loop
    changelog_agent.init()
  File "/usr/libexec/glusterfs/python/syncdaemon/repce.py", line 233, in __call__
    return self.ins(self.meth, *a)
  File "/usr/libexec/glusterfs/python/syncdaemon/repce.py", line 215, in __call__
    raise res
OSError: libgfchangelog.so: cannot open shared object file: No such file or directory

Change-Id: I3dd013d701ed1cd99ba7ef20d1898f343e1db8f5
fixes: bz#1699394
Signed-off-by: Sunny Kumar <sunkumar@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/geo-replication/syncdaemon/libgfchangelog.py b/geo-replication/syncdaemon/libgfchangelog.py
index fff9d24e54f..8d129567075 100644
--- a/geo-replication/syncdaemon/libgfchangelog.py
+++ b/geo-replication/syncdaemon/libgfchangelog.py
@@ -10,13 +10,14 @@
 
 import os
 from ctypes import CDLL, RTLD_GLOBAL, get_errno, byref, c_ulong
+from ctypes.util import find_library
 from syncdutils import ChangelogException, ChangelogHistoryNotAvailable
 from py2py3 import gr_cl_history_changelog, gr_cl_done, gr_create_string_buffer
 from py2py3 import gr_cl_register, gr_cl_history_done, bytearray_to_str
 
 
 class Changes(object):
-    libgfc = CDLL("libgfchangelog.so", mode=RTLD_GLOBAL,
+    libgfc = CDLL(find_library("gfchangelog"), mode=RTLD_GLOBAL,
                   use_errno=True)
 
     @classmethod