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|
{- A "remote" that is just a filesystem directory.
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Remote.Directory (remote) where
import qualified Data.ByteString.Lazy.Char8 as L
import IO
import Control.Exception.Extensible (IOException)
import qualified Data.Map as M
import Control.Monad (when)
import Control.Monad.State (liftIO)
import System.Directory hiding (copyFile)
import System.FilePath
import RemoteClass
import Types
import qualified GitRepo as Git
import qualified Annex
import UUID
import Locations
import CopyFile
import Config
import Content
import Utility
import Remote.Special
import Remote.Encryptable
import Crypto
remote :: RemoteType Annex
remote = RemoteType {
typename = "directory",
enumerate = findSpecialRemotes "directory",
generate = gen,
setup = directorySetup
}
gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex (Remote Annex)
gen r u c = do
dir <- getConfig r "directory" (error "missing directory")
cst <- remoteCost r cheapRemoteCost
return $ encryptableRemote c
(storeEncrypted dir)
(retrieveEncrypted dir)
Remote {
uuid = u,
cost = cst,
name = Git.repoDescribe r,
storeKey = store dir,
retrieveKeyFile = retrieve dir,
removeKey = remove dir,
hasKey = checkPresent dir,
hasKeyCheap = True,
config = Nothing
}
directorySetup :: UUID -> RemoteConfig -> Annex RemoteConfig
directorySetup u c = do
-- verify configuration is sane
let dir = case M.lookup "directory" c of
Nothing -> error "Specify directory="
Just d -> d
e <- liftIO $ doesDirectoryExist dir
when (not e) $ error $ "Directory does not exist: " ++ dir
c' <- encryptionSetup c
-- The directory is stored in git config, not in this remote's
-- persistant state, so it can vary between hosts.
gitConfigSpecialRemote u c' "directory" dir
return $ M.delete "directory" c'
dirKey :: FilePath -> Key -> FilePath
dirKey d k = d </> hashDirMixed k </> f </> f
where
f = keyFile k
store :: FilePath -> Key -> Annex Bool
store d k = do
g <- Annex.gitRepo
let src = gitAnnexLocation g k
let dest = dirKey d k
liftIO $ catchBool $ storeHelper dest $ copyFile src dest
storeEncrypted :: FilePath -> (Cipher, Key) -> Key -> Annex Bool
storeEncrypted d (cipher, enck) k = do
g <- Annex.gitRepo
let src = gitAnnexLocation g k
let dest = dirKey d enck
liftIO $ catchBool $ storeHelper dest $ encrypt src dest
where
encrypt src dest = do
withEncryptedContent cipher (L.readFile src) $ L.writeFile dest
return True
storeHelper :: FilePath -> IO Bool -> IO Bool
storeHelper dest a = do
let dir = parentDir dest
createDirectoryIfMissing True dir
allowWrite dir
ok <- a
when ok $ do
preventWrite dest
preventWrite dir
return ok
retrieve :: FilePath -> Key -> FilePath -> Annex Bool
retrieve d k f = liftIO $ copyFile (dirKey d k) f
retrieveEncrypted :: FilePath -> (Cipher, Key) -> FilePath -> Annex Bool
retrieveEncrypted d (cipher, enck) f =
liftIO $ catchBool $ do
withDecryptedContent cipher (L.readFile (dirKey d enck)) $ L.writeFile f
return True
remove :: FilePath -> Key -> Annex Bool
remove d k = liftIO $ catchBool $ do
allowWrite dir
removeFile file
removeDirectory dir
return True
where
file = dirKey d k
dir = parentDir file
checkPresent :: FilePath -> Key -> Annex (Either IOException Bool)
checkPresent d k = liftIO $ try $ doesFileExist (dirKey d k)
|
