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