@@ -1072,8 +1072,8 @@ function yum_install {

     # The manual check for missing packages is because yum -y assumes

     # missing packages are OK.  See

     # https://bugzilla.redhat.com/show_bug.cgi?id=965567

-    $sudo http_proxy=$http_proxy https_proxy=$https_proxy \

-        no_proxy=$no_proxy \

+    $sudo http_proxy="${http_proxy:-}" https_proxy="${https_proxy:-}" \

+        no_proxy="${no_proxy:-}" \

         ${YUM:-yum} install -y "$@" 2>&1 | \

         awk '

             BEGIN { fail=0 }

@@ -1095,7 +1095,8 @@ function zypper_install {

     [[ "$OFFLINE" = "True" ]] && return

     local sudo="sudo"

     [[ "$(id -u)" = "0" ]] && sudo="env"

-    $sudo http_proxy=$http_proxy https_proxy=$https_proxy \

+    $sudo http_proxy="${http_proxy:-}" https_proxy="${https_proxy:-}" \

+        no_proxy="${no_proxy:-}" \

         zypper --non-interactive install --auto-agree-with-licenses "$@"

 }