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|
{- git-annex "SHA1" backend
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Backend.SHA1 (backend) where
import Control.Monad.State
import Data.String.Utils
import System.Cmd.Utils
import System.IO
import System.Directory
import qualified Backend.File
import TypeInternals
import Messages
import qualified Annex
import Locations
import Core
backend :: Backend
backend = Backend.File.backend {
name = "SHA1",
getKey = keyValue,
fsckKey = Backend.File.checkKey checkKeySHA1
}
sha1 :: FilePath -> Annex String
sha1 file = do
showNote "checksum..."
liftIO $ pOpen ReadFromPipe "sha1sum" [file] $ \h -> do
line <- hGetLine h
let bits = split " " line
if (null bits)
then error "sha1sum parse error"
else return $ bits !! 0
-- A key is a sha1 of its contents.
keyValue :: FilePath -> Annex (Maybe Key)
keyValue file = do
s <- sha1 file
return $ Just $ Key ((name backend), s)
-- A key's sha1 is checked during fsck.
checkKeySHA1 :: Key -> Annex Bool
checkKeySHA1 key = do
g <- Annex.gitRepo
let file = annexLocation g key
present <- liftIO $ doesFileExist file
if (not present)
then return True
else do
s <- sha1 file
if (s == keyName key)
then return True
else do
dest <- moveBad key
showLongNote $ "Bad file content; moved to "++dest
return False
|
