From 6ce071b796d7bbf851df225ca7097d2de26b3456 Mon Sep 17 00:00:00 2001
From: Radoslaw Smigielski <radoslaw.smigielski@alcatel-lucent.com>
Date: Tue, 13 Jan 2015 06:29:31 +0000
Subject: [PATCH] Depreciated pip option PIP_DOWNLOAD_CACHE removal

Fix warning:
DEPRECATION: --download-cache has been deprecated and will be removed in the
future. Pip now automatically uses and configures its cache.

1. Since version 6.0 (2014-12-22) pip has deprecated PIP_DOWNLOAD_CACHE
   and now automatically uses and configures its cache.
   Default new location is $HOME/.cache/pip.
2. pip gets upgraded to the latest version in tools/install_pip.sh
   but if pip version<6, exit with error: "Currently installed pip version
   ${pip_version} does not meet meet minimum requirements"

Change-Id: I8b203ffc6d9cf588462d0d65a9703a9941d8fa71
---
 functions-common | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/functions-common b/functions-common
index 40a0d2b942..30f99ba3e9 100644
--- a/functions-common
+++ b/functions-common
@@ -26,7 +26,6 @@
 # - ``ERROR_ON_CLONE``
 # - ``FILES``
 # - ``OFFLINE``
-# - ``PIP_DOWNLOAD_CACHE``
 # - ``RECLONE``
 # - ``REQUIREMENTS_DIR``
 # - ``STACK_USER``
@@ -1555,8 +1554,7 @@ function get_python_exec_prefix {
 }
 
 # Wrapper for ``pip install`` to set cache and proxy environment variables
-# Uses globals ``OFFLINE``, ``PIP_DOWNLOAD_CACHE``,
-# ``TRACK_DEPENDS``, ``*_proxy``
+# Uses globals ``OFFLINE``, ``TRACK_DEPENDS``, ``*_proxy``
 # pip_install package [package ...]
 function pip_install {
     local xtrace=$(set +o | grep xtrace)
@@ -1581,8 +1579,15 @@ function pip_install {
         local sudo_pip="sudo -H"
     fi
 
+    local pip_version=$(python -c "import pip; \
+                        print(pip.__version__.strip('.')[0])")
+    if (( pip_version<6 )); then
+        die $LINENO "Currently installed pip version ${pip_version} does not" \
+            "meet minimum requirements (>=6)."
+    fi
+
     $xtrace
-    $sudo_pip PIP_DOWNLOAD_CACHE=${PIP_DOWNLOAD_CACHE:-/var/cache/pip} \
+    $sudo_pip \
         http_proxy=$http_proxy \
         https_proxy=$https_proxy \
         no_proxy=$no_proxy \
@@ -1593,7 +1598,7 @@ function pip_install {
     if [[ "$INSTALL_TESTONLY_PACKAGES" == "True" ]]; then
         local test_req="$@/test-requirements.txt"
         if [[ -e "$test_req" ]]; then
-            $sudo_pip PIP_DOWNLOAD_CACHE=${PIP_DOWNLOAD_CACHE:-/var/cache/pip} \
+            $sudo_pip \
                 http_proxy=$http_proxy \
                 https_proxy=$https_proxy \
                 no_proxy=$no_proxy \