From 6bd4924cec73908225e6744b1b00dd86cb39d3ed Mon Sep 17 00:00:00 2001
From: Javier Pena <jpena@redhat.com>
Date: Fri, 15 Sep 2017 15:55:00 +0200
Subject: [PATCH] Ignore stderr when checking for Python version

https://review.openstack.org/504171 prevented Python version detection
from failing when python3 is not installed. However, "which python3"
returns a message in stderr when python3 is not there, and this output
can make diskimage-builder get confused when parsing
source-repository-images.

Change-Id: Idb649dc341ede73c39954b0432ef3cacf379ed37
---
 functions-common | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/functions-common b/functions-common
index 283a6cf3d5..e53c72dc6e 100644
--- a/functions-common
+++ b/functions-common
@@ -2081,7 +2081,7 @@ function _get_python_version {
     local interp=$1
     local version
     # disable erroring out here, otherwise if python 3 doesn't exist we fail hard.
-    if [[ -x $(which $interp) ]]; then
+    if [[ -x $(which $interp 2> /dev/null) ]]; then
         version=$($interp -c 'import sys; print("%s.%s" % sys.version_info[0:2])')
     fi
     echo ${version}