From c510adbc94c50f4e0c30178920a395ee6aa74bef Mon Sep 17 00:00:00 2001
From: Oliver Jowett <oliver@mutability.co.uk>
Date: Mon, 25 Jan 2016 15:22:53 +0000
Subject: [PATCH] $a is a literal sed command, avoid shell var expansion.

---
 debian/dump1090-mutability.postinst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/debian/dump1090-mutability.postinst b/debian/dump1090-mutability.postinst
index 6a3ebd0..b548d42 100644
--- a/debian/dump1090-mutability.postinst
+++ b/debian/dump1090-mutability.postinst
@@ -31,7 +31,7 @@ subvar_raw() {
 
   if ! grep -Eq "^ *$2=" $SRCCONFIGFILE; then
     # if not present in the config file, add it at the end
-    echo "$a $2=$1" >> $SEDSCRIPT
+    echo "\$a $2=$1" >> $SEDSCRIPT
   else
     # otherwise, replace the current value
     echo "s@^ *$2=.*@$2=\"$1\"@" >>$SEDSCRIPT