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{- git-annex "URL" backend
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Backend.URL (backend) where
import Control.Exception
import Control.Monad.State (liftIO)
import Data.String.Utils
import System.Cmd
import System.Cmd.Utils
import System.Exit
import TypeInternals
import Core
backend = Backend {
name = "URL",
getKey = keyValue,
storeFileKey = dummyStore,
retrieveKeyFile = downloadUrl,
removeKey = dummyOk,
hasKey = dummyOk
}
-- cannot generate url from filename
keyValue :: FilePath -> Annex (Maybe Key)
keyValue file = return Nothing
-- cannot change url contents
dummyStore :: FilePath -> Key -> Annex Bool
dummyStore file url = return False
-- allow keys to be removed; presumably they can always be downloaded again
dummyOk :: Key -> Annex Bool
dummyOk url = return True
downloadUrl :: Key -> FilePath -> Annex Bool
downloadUrl key file = do
showNote "downloading"
liftIO $ putStrLn "" -- make way for curl progress bar
result <- liftIO $ (try curl::IO (Either SomeException ()))
case result of
Left err -> return False
Right succ -> return True
where
curl = safeSystem "curl" ["-#", "-o", file, url]
url = join ":" $ drop 1 $ split ":" $ show key
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