1 files changed, 5 insertions, 1 deletions
diff --git a/src/Propellor/Engine.hs b/src/Propellor/Engine.hs
index 0b65fb7e..81cc2397 100644
--- a/src/Propellor/Engine.hs
+++ b/src/Propellor/Engine.hs
@@ -77,12 +77,16 @@ processChainOutput h = go Nothing
   where
 	go lastline = do
 		v <- catchMaybeIO (hGetLine h)
+		debug ["read from chained propellor: ", show v]
 		case v of
 			Nothing -> case lastline of
-				Nothing -> pure FailedChange
+				Nothing -> do
+					debug ["chained propellor output nothing; assuming it failed"]
+					return FailedChange
 				Just l -> case readish l of
 					Just r -> pure r
 					Nothing -> do
+						debug ["chained propellor output did not end with a Result; assuming it failed"]
 						putStrLn l
 						hFlush stdout
 						return FailedChange