Report duplicity failure output at error loglevel so that it is emailed.

ChangeLog

@@ -8,6 +8,8 @@ version 1.0 -- UNRELEASED
 	 . Adapt for new duplicity SSH backend.
 	   Support bandwidthlimit with new duplicity, using trickle.
 	   (Closes: #657201)
+	 . Report failure output at error loglevel so that it is emailed
+	   (Closes: #536858)
 	mysql:
 	 . Don't attempt to dump performance_schema database (Redmine#3741).
 	pgsql:

handlers/dup.in

@@ -339,7 +339,11 @@ if [ ! $test ]; then
    exit_code=$?
    debug $output
    cat $outputfile | (while read output ; do
+                         if [ $exit_code -eq 0 ]; then
                             info $output
+                         else
+                            error $output
+                         fi
                       done
    )
    if [ $exit_code -eq 0 ]; then