core/build/various: python3 compat, prepare for python2 -> python3

Note 1) we're not supposed to be using #!/usr/bin/env python, see
https://fedoraproject.org/wiki/Packaging:Guidelines?rd=Packaging/Guidelines#Shebang_lines

Note 2) we're also not supposed to be using "!/usr/bin/python,
see https://fedoraproject.org/wiki/Changes/Avoid_usr_bin_python_in_RPM_Build#Quick_Opt-Out

The previous patch (https://review.gluster.org/19767) tried to do too
much in one patch, so it was abandoned.

This patch does two things:
1) minor cleanup of configure(.ac) to explicitly use python2
2) change all the shebang lines to #!/usr/bin/python2 and add them
where they were missing based on warnings emitted during rpmbuild.

In a follow-up patch python2 will eventually be changed to python3.

Before that python2-isms (e.g. print, string.join(), etc.) need to be
converted to python3. Some of those can be rewritten in version agnostic
python. E.g. print statements become print() with "from __future_ import
print_function". The python 2to3 utility will be used for some of those.
Also Aravinda has given guidance in the comments to the first patch for
changes.

updates: #411
Change-Id: I471730962b2526022115a1fc33629fb078b74338
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>

4 files changed, 4 insertions, 3 deletions

diff --git a/geo-replication/syncdaemon/changelogagent.py b/geo-replication/syncdaemon/changelogagent.py
index 4fb8d254dea..5eade137d25 100644
--- a/geo-replication/syncdaemon/changelogagent.py
+++ b/geo-replication/syncdaemon/changelogagent.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python2
 #
 # Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.
diff --git a/geo-replication/syncdaemon/conf.py.in b/geo-replication/syncdaemon/conf.py.in
index 2042fa9cdfb..5846b9b5f26 100644
--- a/geo-replication/syncdaemon/conf.py.in
+++ b/geo-replication/syncdaemon/conf.py.in
@@ -1,3 +1,4 @@
+#!/usr/bin/python2
 #
 # Copyright (c) 2016 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.
diff --git a/geo-replication/syncdaemon/gsyncd.py b/geo-replication/syncdaemon/gsyncd.py
index 3458898646e..1ab65877467 100644
--- a/geo-replication/syncdaemon/gsyncd.py
+++ b/geo-replication/syncdaemon/gsyncd.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 from argparse import ArgumentParser
 import time
 import os
diff --git a/geo-replication/syncdaemon/gsyncdstatus.py b/geo-replication/syncdaemon/gsyncdstatus.py
index 1df24330438..b1fed727cbe 100644
--- a/geo-replication/syncdaemon/gsyncdstatus.py
+++ b/geo-replication/syncdaemon/gsyncdstatus.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python2
 #
 # Copyright (c) 2011-2014 Red Hat, Inc. <http://www.redhat.com>
 # This file is part of GlusterFS.