From 226e92fa4d3d7bcc2fdb090a40dc1ba082eb5e6a Mon Sep 17 00:00:00 2001
From: Ghe Rivero <ghe.rivero@hp.com>
Date: Wed, 2 Jul 2014 10:55:43 +0000
Subject: [PATCH] Avoid to install a blank list of packages

There are some situations where the list of packages to install
in a image is blank (packages blacklisted).

Change-Id: I315f97fe619c25b36cf47ed1b7a65936b753312e
---
 elements/yum/bin/install-packages | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/elements/yum/bin/install-packages b/elements/yum/bin/install-packages
index 68409afd0..c845c6622 100755
--- a/elements/yum/bin/install-packages
+++ b/elements/yum/bin/install-packages
@@ -77,11 +77,15 @@ if [ -n "$WHITELIST" ]; then
     else
         PKGS=$(map-packages $WHITELIST)
     fi
-    echo "Installing $PKGS"
-    yum -y $ACTION $EXTRA_ARGS $PKGS
-    for pkg in "$@"; do
-        if [ "$pkg" = "python-pip" ] ; then
-            alternatives --install /usr/bin/pip pip /usr/bin/pip-python 10
-        fi
-    done
+    if [ -z "${PKGS}" ]; then
+        echo "Not running install-packages $ACTION with empty packages list"
+    else
+        echo "Running install-packages ${ACTION}. Package list: $PKGS"
+        yum -y $ACTION $EXTRA_ARGS $PKGS
+        for pkg in "$@"; do
+            if [ "$pkg" = "python-pip" ] ; then
+                alternatives --install /usr/bin/pip pip /usr/bin/pip-python 10
+            fi
+        done
+    fi
 fi