39 lines
973 B
Haskell
39 lines
973 B
Haskell
{- git-annex "WORM" backend -- Write Once, Read Many
|
|
-
|
|
- Copyright 2010 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Backend.WORM (backends) where
|
|
|
|
import Common.Annex
|
|
import Types.Backend
|
|
import Types.Key
|
|
|
|
backends :: [Backend]
|
|
backends = [backend]
|
|
|
|
backend :: Backend
|
|
backend = Backend
|
|
{ name = "WORM"
|
|
, getKey = keyValue
|
|
, fsckKey = Nothing
|
|
}
|
|
|
|
{- The key includes the file size, modification time, and the
|
|
- basename of the filename.
|
|
-
|
|
- That allows multiple files with the same names to have different keys,
|
|
- while also allowing a file to be moved around while retaining the
|
|
- same key.
|
|
-}
|
|
keyValue :: KeySource -> Annex (Maybe Key)
|
|
keyValue source = do
|
|
stat <- liftIO $ getFileStatus $ contentLocation source
|
|
return $ Just Key {
|
|
keyName = takeFileName $ keyFilename source,
|
|
keyBackendName = name backend,
|
|
keySize = Just $ fromIntegral $ fileSize stat,
|
|
keyMtime = Just $ modificationTime stat
|
|
}
|