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diff --git a/CmdLine/GitAnnexShell/Fields.hs b/CmdLine/GitAnnexShell/Fields.hs
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+++ b/CmdLine/GitAnnexShell/Fields.hs
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+{- git-annex-shell fields
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module CmdLine.GitAnnexShell.Fields where
+
+import Common.Annex
+import qualified Annex
+
+import Data.Char
+
+{- A field, stored in Annex state, with a value sanity checker. -}
+data Field = Field
+	{ fieldName :: String
+	, fieldCheck :: String -> Bool
+	}
+
+getField :: Field -> Annex (Maybe String)
+getField = Annex.getField . fieldName
+
+remoteUUID :: Field
+remoteUUID = Field "remoteuuid" $
+	-- does it look like a UUID?
+	all (\c -> isAlphaNum c || c == '-')
+
+associatedFile :: Field
+associatedFile = Field "associatedfile" $ \f ->
+	-- is the file a safe relative filename?
+	not (isAbsolute f) && not ("../" `isPrefixOf` f)
+
+direct :: Field
+direct = Field "direct" $ \f -> f == "1"