From a9e1d9aa890c18ea3c3250442e7d9de555633237 Mon Sep 17 00:00:00 2001
From: "n.st" <git@n-st.de>
Date: Wed, 4 Jun 2014 19:26:46 +0200
Subject: [PATCH] Cancel upgrade if $ZSH is not writable from #2360

---
 tools/check_for_upgrade.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/check_for_upgrade.sh b/tools/check_for_upgrade.sh
index c5fd0cce1..8b8ecae03 100644
--- a/tools/check_for_upgrade.sh
+++ b/tools/check_for_upgrade.sh
@@ -20,6 +20,12 @@ if [[ -z "$epoch_target" ]]; then
   epoch_target=13
 fi
 
+[ -f ~/.profile ] && source ~/.profile
+
+# Cancel upgrade if the current user doesn't have write permissions for the
+# oh-my-zsh directory.
+[[ -w "$ZSH" ]] || return 0
+
 if [ -f ~/.zsh-update ]
 then
   . ~/.zsh-update