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>

7 files changed, 8 insertions, 6 deletions

diff --git a/xlators/experimental/fdl/src/gen_dumper.py b/xlators/experimental/fdl/src/gen_dumper.py
index 42db55d2cb3..2950be44e01 100755
--- a/xlators/experimental/fdl/src/gen_dumper.py
+++ b/xlators/experimental/fdl/src/gen_dumper.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 import os
 import re
diff --git a/xlators/experimental/fdl/src/gen_fdl.py b/xlators/experimental/fdl/src/gen_fdl.py
index d59f12a4841..136aa112861 100755
--- a/xlators/experimental/fdl/src/gen_fdl.py
+++ b/xlators/experimental/fdl/src/gen_fdl.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 import os
 import sys
diff --git a/xlators/experimental/fdl/src/gen_recon.py b/xlators/experimental/fdl/src/gen_recon.py
index 57a5360a9f8..295df699f6e 100755
--- a/xlators/experimental/fdl/src/gen_recon.py
+++ b/xlators/experimental/fdl/src/gen_recon.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 import os
 import re
diff --git a/xlators/experimental/jbr-client/src/gen-fops.py b/xlators/experimental/jbr-client/src/gen-fops.py
index 4d9451f7177..64bd8b06cae 100755
--- a/xlators/experimental/jbr-client/src/gen-fops.py
+++ b/xlators/experimental/jbr-client/src/gen-fops.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 import os
 import re
diff --git a/xlators/experimental/jbr-server/src/gen-fops.py b/xlators/experimental/jbr-server/src/gen-fops.py
index c4a5556a8fa..2005e3932d4 100755
--- a/xlators/experimental/jbr-server/src/gen-fops.py
+++ b/xlators/experimental/jbr-server/src/gen-fops.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 # This script generates the boilerplate versions of most fops and cbks in the
 # server.  This allows the details of leadership-status checking, sequencing
diff --git a/xlators/features/changelog/lib/examples/python/changes.py b/xlators/features/changelog/lib/examples/python/changes.py
index 221df642a36..c0341b52ca3 100644
--- a/xlators/features/changelog/lib/examples/python/changes.py
+++ b/xlators/features/changelog/lib/examples/python/changes.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python2
 
 import os
 import sys
diff --git a/xlators/features/glupy/src/__init__.py.in b/xlators/features/glupy/src/__init__.py.in
index 3ad9513f40e..2a66079de12 100644
--- a/xlators/features/glupy/src/__init__.py.in
+++ b/xlators/features/glupy/src/__init__.py.in
@@ -1,2 +1,4 @@
+#!/usr/bin/python2
+
 from pkgutil import extend_path
 __path__ = extend_path(__path__, __name__)