From de0708af3bd0dfb121734244c7d3fb51723c5590 Mon Sep 17 00:00:00 2001
From: Elana Hashman <ehashman@csclub.uwaterloo.ca>
Date: Sun, 26 Nov 2017 23:59:48 -0500
Subject: [PATCH] Avoid "You have $CLASSPATH set" errors on upgrade

When we exec the newly downloaded leiningen script, it will replace our
current shell process and recalculate the classpath for us, so we can
safely unset this here. This avoids the new script throwing warnings
about the CLASSPATH variable being set (from the previous run) on
upgrades.
---
 bin/lein | 1 +
 1 file changed, 1 insertion(+)

diff --git a/bin/lein b/bin/lein
index 4dcb2531..9a860ee7 100755
--- a/bin/lein
+++ b/bin/lein
@@ -285,6 +285,7 @@ elif [ "$1" = "upgrade" ] || [ "$1" = "downgrade" ]; then
                         echo "Leiningen is already up-to-date."
                     fi
                     mv "$TARGET" "$SCRIPT" && chmod +x "$SCRIPT"
+                    unset CLASSPATH
                     exec "$SCRIPT" version
                 else
                     download_failed_message "$LEIN_SCRIPT_URL"