diff --git a/src/Propellor/Property/Git.hs b/src/Propellor/Property/Git.hs
index e5df7e4..eb82159 100644
--- a/src/Propellor/Property/Git.hs
+++ b/src/Propellor/Property/Git.hs
@@ -91,3 +91,6 @@ cloned owner url dir mbranch = check originurl (property desc checkout)
 			-- installed here.
 			, Just "git update-server-info"
 			]
+
+isRepo :: FilePath -> IO Bool
+isRepo dir = isNothing <$> catchMaybeIO (readProcess "git" ["rev-parse", "--resolve-git-dir", dir])