44 lines
1.1 KiB
Haskell
44 lines
1.1 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 Common.Annex
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import Types.Backend
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import Types.Key
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import Types.KeySource
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import Backend.Utilities
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backends :: [Backend]
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backends = [backend]
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backend :: Backend
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backend = Backend
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{ name = "WORM"
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, getKey = keyValue
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, fsckKey = Nothing
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, canUpgradeKey = Nothing
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, fastMigrate = Nothing
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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 :: KeySource -> Annex (Maybe Key)
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keyValue source = do
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stat <- liftIO $ getFileStatus $ contentLocation source
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n <- genKeyName $ keyFilename source
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return $ Just Key
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{ keyName = n
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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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