python: Workaround UNIX socket path length limits

python: Workaround UNIX socket path length limits

From aa28e8bfb646a54ba91e3545f3c0b9db39eddb7f Mon Sep 17 00:00:00 2001
From: James Page <james.page@ubuntu.com>
Date: Wed, 16 Jan 2013 10:52:59 +0000
Subject: [PATCH] python: Workaround UNIX socket path length limits
To: dev@openvswitch.org

UNIX socket paths have a limit in terms of length.  On Linux
this is 103 characters.

This is a problem in Debian/Ubuntu buildds which can generate
quite long paths.

This patch works around this issue by detecting when socket
connection/binding fails due to this issue and accessing the
socket path using a file descriptor path in /proc/self/fd.

The workaround is limited to Linux.

This is based on similar code in the C parts of OpenvSwitch.

Signed-off-by: James Page <james.page@ubuntu.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>