From a8aec94b90ee2c15bb69380ffb97b662c6d8b5bc Mon Sep 17 00:00:00 2001
From: Peter Palfrader <peter@palfrader.org>
Date: Sat, 19 Mar 2016 08:41:51 +0100
Subject: Only accept numbers from .publish.ttl files

---
 publish-purge | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/publish-purge b/publish-purge
index ea65755..0be0fd7 100755
--- a/publish-purge
+++ b/publish-purge
@@ -57,7 +57,14 @@ cleanit()
     d=$(readlink -f -- "$d")
 
     if [ -e "$d/.publish.ttl" ]; then
-       ttl="$(cat "$d/.publish.ttl")"
+        local newttl
+        newttl="$(cat "$d/.publish.ttl")"
+        if [ "$newttl" -eq "$newttl" ] 2>/dev/null; then
+            # if it is a number
+            ttl="$newttl"
+        else
+            [ "$optVerbose" -ge "1" ] && echo "Ignoring invalid TTL setting '$newttl' in $d"
+        fi
     fi
 
     if test_if_ancient "$d" "$ttl"; then
-- 
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