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diff --git a/Command/Fsck.hs b/Command/Fsck.hs
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+{- git-annex command
+ -
+ - Copyright 2010 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.Fsck where
+
+import Control.Monad.State (liftIO)
+import System.Posix.Files
+import System.Directory
+
+import Command
+import qualified Annex
+import Types
+import Utility
+import Core
+
+{- Checks the whole annex for problems. -}
+start :: SubCmdStart
+start = do
+	showStart "fsck" ""
+	return $ Just perform
+
+perform :: SubCmdPerform
+perform = do
+	ok <- checkUnused
+	if (ok)
+		then return $ Just $ return True
+		else do
+			showLongNote "Possible problems detected."
+			return Nothing
+
+checkUnused :: Annex Bool
+checkUnused = do
+	showNote "checking for unused data..."
+	-- TODO
+	return False