65 lines
1.9 KiB
Haskell
65 lines
1.9 KiB
Haskell
{- git-annex "WORM" backend -- Write Once, Read Many
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-
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- Copyright 2010 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Backend.WORM (backends) where
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import Annex.Common
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import Types.Key
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import Types.Backend
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import Types.KeySource
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import Backend.Utilities
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import Git.FilePath
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import Utility.Metered
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import qualified Data.ByteString.Char8 as S8
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import qualified Utility.RawFilePath as R
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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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{ backendVariety = WORMKey
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, genKey = Just keyValue
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, verifyKeyContent = Nothing
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, canUpgradeKey = Just needsUpgrade
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, fastMigrate = Just removeProblemChars
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, isStableKey = const True
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, isCryptographicallySecure = const False
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}
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{- The key includes the file size, modification time, and the
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- original filename relative to the top of the git repository.
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-}
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keyValue :: KeySource -> MeterUpdate -> Annex Key
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keyValue source _ = do
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let f = contentLocation source
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stat <- liftIO $ R.getFileStatus f
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sz <- liftIO $ getFileSize' (fromRawFilePath f) stat
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relf <- fromRawFilePath . getTopFilePath
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<$> inRepo (toTopFilePath $ keyFilename source)
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return $ mkKey $ \k -> k
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{ keyName = genKeyName relf
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, keyVariety = WORMKey
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, keySize = Just sz
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, keyMtime = Just $ modificationTime stat
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}
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{- Old WORM keys could contain spaces and carriage returns,
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- and can be upgraded to remove them. -}
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needsUpgrade :: Key -> Bool
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needsUpgrade key = any (`S8.elem` fromKey keyName key) [' ', '\r']
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removeProblemChars :: Key -> Backend -> AssociatedFile -> Annex (Maybe Key)
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removeProblemChars oldkey newbackend _
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| migratable = return $ Just $ alterKey oldkey $ \d -> d
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{ keyName = encodeBS $ reSanitizeKeyName $ decodeBS $ keyName d }
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| otherwise = return Nothing
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where
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migratable = oldvariety == newvariety
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oldvariety = fromKey keyVariety oldkey
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newvariety = backendVariety newbackend
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