debian/changelog

+routino (3.2-4) unstable; urgency=medium
+
+  * Test for results before executing chown on them.
+    (closes: #904405)
+
+ -- Bas Couwenberg <sebastic@debian.org>  Tue, 24 Jul 2018 15:13:47 +0200
+
 routino (3.2-3) unstable; urgency=medium
 
   * Change priority from extra to optional.

debian/routino-www.postinst

@@ -43,7 +43,12 @@ case "$1" in
 			mkdir -p /var/lib/routino/results
 		fi
 		chown www-data:www-data /var/lib/routino/results
+		if [ `ls /var/lib/routino/results/ | wc -l` -ge 1 ]; then
 			chown www-data:www-data /var/lib/routino/results/*
+		fi
+		if [ `ls /var/lib/routino/results/*/* | wc -l` -ge 1 ]; then
+			chown www-data:www-data /var/lib/routino/results/*/*
+		fi
 
 		webservers="apache2"