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{- 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 Control.Monad.State
import System.FilePath
import System.Posix.Files
import System.Directory
import Data.Maybe
import qualified Backend.File
import BackendTypes
import Locations
import qualified Annex
import Content
import Messages
import Types
import Key
backends :: [Backend Annex]
backends = [backend]
backend :: Backend Annex
backend = Backend.File.backend {
name = "WORM",
getKey = keyValue,
fsckKey = Backend.File.checkKey checkKeySize
}
{- 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 :: FilePath -> Annex (Maybe Key)
keyValue file = do
stat <- liftIO $ getFileStatus file
return $ Just $ Key {
keyName = takeFileName file,
keyBackendName = name backend,
keySize = Just $ fromIntegral $ fileSize stat,
keyMtime = Just $ modificationTime stat
}
{- The size of the data for a key is checked against the size encoded in
- the key's metadata. -}
checkKeySize :: Key -> Annex Bool
checkKeySize key = do
g <- Annex.gitRepo
let file = gitAnnexLocation g key
present <- liftIO $ doesFileExist file
if not present
then return True
else do
s <- liftIO $ getFileStatus file
if fromIntegral (fileSize s) == fromJust (keySize key)
then return True
else do
dest <- moveBad key
warning $ "Bad file size; moved to " ++ dest
return False
|
