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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 BackendTypes
import Messages
import qualified Annex
import Locations
import Content
import Types
backend :: Backend Annex
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 $ head bits
-- 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
warning $ "Bad file content; moved to "++dest
return False
|
