From 4e385fcda73dd437152d42aefdde4bcb79d23c78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Forsman?= <bjorn.forsman@gmail.com>
Date: Sat, 7 Dec 2013 21:13:06 +0100
Subject: [PATCH] stdenv/patchShebangs: fix shebang check

patchShebangs has a bug that shows itself on files that have the
executable bit set but have no shebang (i.e. a blank/empty first line).
The shell would then evaluate this:

if [ != '#!' ]; then
  # not evaluated
fi

With proper quoting we get the correct behaviour:

if [ "" != '#!' ]; then
  # this will be evaluated
fi
---
 pkgs/stdenv/generic/setup.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 1ed905db363..84d499696c9 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -669,7 +669,7 @@ patchShebangs() {
     local newInterpreterLine
 
     for f in $(find "$dir" -type f -perm +0100); do
-        if [ $(head -1 "$f" | head -c +2) != '#!' ]; then
+        if [ "$(head -1 "$f" | head -c +2)" != '#!' ]; then
             # missing shebang => not a script
             continue
         fi