georep: Fix python3 compatibility (os.pipe)

'os.pipe' returns pair of file descriptors
which are non-inheritable by child processes.
But geo-rep uses te inheritable nature of
pipe fds to communicate between parent and
child processes. Hence wrote a compatiable
pipe routine which works well both with python2
and python3 with inheritable nature.

Updates: #411
Change-Id: I869d7a52eeecdecf3851d44ed400e69b32a612d9
Signed-off-by: Kotresh HR <khiremat@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/geo-replication/syncdaemon/syncdutils.py b/geo-replication/syncdaemon/syncdutils.py
index 93e09756198..b2b866f8817 100644
--- a/geo-replication/syncdaemon/syncdutils.py
+++ b/geo-replication/syncdaemon/syncdutils.py
@@ -1016,3 +1016,15 @@ def get_up_nodes(hosts, port):
             up_nodes.append(h)
 
     return up_nodes
+
+
+def pipe():
+    # Pipe routine for python2 and python3 compatiability
+    try:
+        (r, w) = os.pipe()
+        os.set_inheritable(r, True)
+        os.set_inheritable(w, True)
+    except AttributeError:
+        (r, w) = os.pipe()
+
+    return (r, w)