From c06f693ac3f8400e2822f84fb5b77cc2efbaaa5e Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Sat, 8 Oct 2016 00:36:24 +0300
Subject: [PATCH] upip: expandhome(): Call uos.getenv() only if there's
 something to expand.

To work on baremetal targets without getenv().
---
 upip/upip.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/upip/upip.py b/upip/upip.py
index 13b0ad2a..50de6c3a 100644
--- a/upip/upip.py
+++ b/upip/upip.py
@@ -89,8 +89,9 @@ def install_tar(f, prefix):
     return meta
 
 def expandhome(s):
-    h = os.getenv("HOME")
-    s = s.replace("~/", h + "/")
+    if "~/" in s:
+        h = os.getenv("HOME")
+        s = s.replace("~/", h + "/")
     return s
 
 import ussl