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diff --git a/Remote/Helper/ReadOnly.hs b/Remote/Helper/ReadOnly.hs
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+++ b/Remote/Helper/ReadOnly.hs
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+{- Adds readonly support to remotes.
+ -
+ - Copyright 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Remote.Helper.ReadOnly (adjustReadOnly) where
+
+import Common.Annex
+import Types.Remote
+
+{- Adds support for read-only remotes, by replacing the
+ - methods that write to a remote with dummies that fail.
+ -
+ - Note that disabling git pushes to remotes is not handled here.
+ -}
+adjustReadOnly :: Remote -> Remote
+adjustReadOnly r
+	| remoteAnnexReadOnly (gitconfig r) = r
+		{ storeKey = \_ _ _ -> failbool
+		, removeKey = \_ -> failbool
+		, repairRepo = Nothing
+		}
+	| otherwise = r
+  where
+	failbool = do
+		warning "this remote is readonly"
+		return False