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diff --git a/Annex/Index.hs b/Annex/Index.hs
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+{- Using other git index files
+ -
+ - Copyright 2014 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+{-# LANGUAGE CPP #-}
+
+module Annex.Index (
+	withIndexFile,
+) where
+
+import qualified Control.Exception as E
+
+import Common.Annex
+import Git.Types
+import qualified Annex
+import Utility.Env
+import Annex.Exception
+
+{- Runs an action using a different git index file. -}
+withIndexFile :: FilePath -> Annex a -> Annex a
+withIndexFile f a = do
+	g <- gitRepo
+#ifdef __ANDROID__
+	{- This should not be necessary on Android, but there is some
+	 - weird getEnvironment breakage. See
+	 - https://github.com/neurocyte/ghc-android/issues/7
+	 - Use getEnv to get some key environment variables that
+	 - git expects to have. -}
+	let keyenv = words "USER PATH GIT_EXEC_PATH HOSTNAME HOME"
+	let getEnvPair k = maybe Nothing (\v -> Just (k, v)) <$> getEnv k
+	e <- liftIO $ catMaybes <$> forM keyenv getEnvPair
+	let e' = ("GIT_INDEX_FILE", f):e
+#else
+	e <- liftIO getEnvironment
+	let e' = addEntry "GIT_INDEX_FILE" f e
+#endif
+	let g' = g { gitEnv = Just e' }
+
+	r <- tryAnnex $ do
+		Annex.changeState $ \s -> s { Annex.repo = g' }
+		a
+	Annex.changeState $ \s -> s { Annex.repo = (Annex.repo s) { gitEnv = gitEnv g} }
+	either E.throw return r