43 lines
1 KiB
Haskell
43 lines
1 KiB
Haskell
{- git-annex "WORM" backend -- Write Once, Read Many
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-
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- Copyright 2010 Joey Hess <joey@kitenet.net>
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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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module Backend.WORM (backends) where
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import Control.Monad.State
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import System.FilePath
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import System.Posix.Files
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import Types.Backend
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import Types
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import Types.Key
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backends :: [Backend Annex]
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backends = [backend]
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backend :: Backend Annex
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backend = Types.Backend.Backend {
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name = "WORM",
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getKey = keyValue,
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fsckKey = const (return True)
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}
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{- The key includes the file size, modification time, and the
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- basename of the filename.
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-
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- That allows multiple files with the same names to have different keys,
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- while also allowing a file to be moved around while retaining the
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- same key.
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-}
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keyValue :: FilePath -> Annex (Maybe Key)
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keyValue file = do
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stat <- liftIO $ getFileStatus file
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return $ Just Key {
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keyName = takeFileName file,
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keyBackendName = name backend,
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keySize = Just $ fromIntegral $ fileSize stat,
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keyMtime = Just $ modificationTime stat
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}
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