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{- git-annex "file" backend
- -}
module BackendFile (backend) where
import Control.Monad.State
import System.IO
import System.Cmd
import Control.Exception
import Types
import LocationLog
import Locations
import Remotes
import qualified GitRepo as Git
backend = Backend {
name = "file",
getKey = keyValue,
storeFileKey = dummyStore,
retrieveKeyFile = copyKeyFile,
removeKey = dummyRemove
}
-- direct mapping from filename to key
keyValue :: FilePath -> Annex (Maybe Key)
keyValue file = return $ Just $ Key file
{- This backend does not really do any independant data storage,
- it relies on the file contents in .git/annex/ in this repo,
- and other accessible repos. So storing or removing a key is
- a no-op. TODO until support is added for git annex --push otherrepo,
- then these could implement that.. -}
dummyStore :: FilePath -> Key -> Annex (Bool)
dummyStore file key = return True
dummyRemove :: Key -> Annex Bool
dummyRemove url = return False
{- Try to find a copy of the file in one of the remotes,
- and copy it over to this one. -}
copyKeyFile :: Key -> FilePath -> Annex (Bool)
copyKeyFile key file = do
remotes <- remotesWithKey key
trycopy remotes remotes
where
trycopy full [] = error $ "unable to get: " ++ (keyFile key) ++ "\n" ++
"To get that file, need access to one of these remotes: " ++
(remotesList full)
trycopy full (r:rs) = do
-- annexLocation needs the git config to have been
-- read for a remote, so do that now,
-- if it hasn't been already
r' <- remoteEnsureGitConfigRead r
result <- liftIO $ (try (copyFromRemote r' key file)::IO (Either SomeException ()))
case (result) of
Left err -> do
liftIO $ hPutStrLn stderr (show err)
trycopy full rs
Right succ -> return True
{- Tries to copy a file from a remote, exception on error. -}
copyFromRemote :: Git.Repo -> Key -> FilePath -> IO ()
copyFromRemote r key file = do
putStrLn $ "copy from " ++ (Git.repoDescribe r ) ++ " " ++ file
if (Git.repoIsLocal r)
then getlocal
else getremote
return ()
where
getlocal = rawSystem "cp" ["-a", location, file]
getremote = error "get via network not yet implemented!"
location = annexLocation r backend key
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