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-rw-r--r--Propellor/Property.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/Propellor/Property.hs b/Propellor/Property.hs
index c2a8972e..ca492e33 100644
--- a/Propellor/Property.hs
+++ b/Propellor/Property.hs
@@ -3,6 +3,7 @@ module Propellor.Property where
import System.Directory
import Control.Monad
import Data.Monoid
+import Control.Monad.IfElse
import Propellor.Types
import Propellor.Engine
@@ -54,7 +55,8 @@ flagFile property flagfile = Property (propertyDesc property) $
go False = do
r <- ensureProperty property
when (r == MadeChange) $
- writeFile flagfile ""
+ unlessM (doesFileExist flagfile) $
+ writeFile flagfile ""
return r
--- | Whenever a change has to be made for a Property, causes a hook