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