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|
{- A "remote" that is just a filesystem directory.
-
- Copyright 2011-2014 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Remote.Directory (
remote,
finalizeStoreGeneric,
removeDirGeneric,
) where
import qualified Data.ByteString.Lazy as L
import qualified Data.Map as M
import Common.Annex
import Types.Remote
import Types.Creds
import qualified Git
import Config.Cost
import Config
import Utility.FileMode
import Remote.Helper.Special
import qualified Remote.Directory.LegacyChunked as Legacy
import Annex.Content
import Annex.UUID
import Utility.Metered
remote :: RemoteType
remote = RemoteType {
typename = "directory",
enumerate = findSpecialRemotes "directory",
generate = gen,
setup = directorySetup
}
gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
gen r u c gc = do
cst <- remoteCost gc cheapRemoteCost
let chunkconfig = getChunkConfig c
return $ Just $ specialRemote c
(prepareStore dir chunkconfig)
(retrieve dir chunkconfig)
(simplyPrepare $ remove dir)
(simplyPrepare $ checkKey dir chunkconfig)
Remote {
uuid = u,
cost = cst,
name = Git.repoDescribe r,
storeKey = storeKeyDummy,
retrieveKeyFile = retreiveKeyFileDummy,
retrieveKeyFileCheap = retrieveCheap dir chunkconfig,
removeKey = removeKeyDummy,
checkPresent = checkPresentDummy,
checkPresentCheap = True,
whereisKey = Nothing,
remoteFsck = Nothing,
repairRepo = Nothing,
config = c,
repo = r,
gitconfig = gc,
localpath = Just dir,
readonly = False,
availability = LocallyAvailable,
remotetype = remote,
mkUnavailable = gen r u c $
gc { remoteAnnexDirectory = Just "/dev/null" }
}
where
dir = fromMaybe (error "missing directory") $ remoteAnnexDirectory gc
directorySetup :: Maybe UUID -> Maybe CredPair -> RemoteConfig -> Annex (RemoteConfig, UUID)
directorySetup mu _ c = do
u <- maybe (liftIO genUUID) return mu
-- verify configuration is sane
let dir = fromMaybe (error "Specify directory=") $
M.lookup "directory" c
absdir <- liftIO $ absPath dir
liftIO $ unlessM (doesDirectoryExist absdir) $
error $ "Directory does not exist: " ++ absdir
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" absdir
return (M.delete "directory" c', u)
{- Locations to try to access a given Key in the directory.
- We try more than one since we used to write to different hash
- directories. -}
locations :: FilePath -> Key -> [FilePath]
locations d k = map (d </>) (keyPaths k)
{- Returns the location off a Key in the directory. If the key is
- present, returns the location that is actually used, otherwise
- returns the first, default location. -}
getLocation :: FilePath -> Key -> IO FilePath
getLocation d k = do
let locs = locations d k
fromMaybe (Prelude.head locs) <$> firstM doesFileExist locs
{- Directory where the file(s) for a key are stored. -}
storeDir :: FilePath -> Key -> FilePath
storeDir d k = addTrailingPathSeparator $ d </> hashDirLower k </> keyFile k
{- Where we store temporary data for a key, in the directory, as it's being
- written. -}
tmpDir :: FilePath -> Key -> FilePath
tmpDir d k = addTrailingPathSeparator $ d </> "tmp" </> keyFile k
{- Check if there is enough free disk space in the remote's directory to
- store the key. Note that the unencrypted key size is checked. -}
prepareStore :: FilePath -> ChunkConfig -> Preparer Storer
prepareStore d chunkconfig = checkPrepare
(\k -> checkDiskSpace (Just d) k 0)
(byteStorer $ store d chunkconfig)
store :: FilePath -> ChunkConfig -> Key -> L.ByteString -> MeterUpdate -> Annex Bool
store d chunkconfig k b p = liftIO $ do
void $ tryIO $ createDirectoryIfMissing True tmpdir
case chunkconfig of
LegacyChunks chunksize -> Legacy.store chunksize finalizeStoreGeneric k b p tmpdir destdir
_ -> do
let tmpf = tmpdir </> keyFile k
meteredWriteFile p tmpf b
finalizeStoreGeneric tmpdir destdir
return True
where
tmpdir = tmpDir d k
destdir = storeDir d k
{- Passed a temp directory that contains the files that should be placed
- in the dest directory, moves it into place. Anything already existing
- in the dest directory will be deleted. File permissions will be locked
- down. -}
finalizeStoreGeneric :: FilePath -> FilePath -> IO ()
finalizeStoreGeneric tmp dest = do
void $ tryIO $ allowWrite dest -- may already exist
void $ tryIO $ removeDirectoryRecursive dest -- or not exist
createDirectoryIfMissing True (parentDir dest)
renameDirectory tmp dest
-- may fail on some filesystems
void $ tryIO $ do
mapM_ preventWrite =<< dirContents dest
preventWrite dest
retrieve :: FilePath -> ChunkConfig -> Preparer Retriever
retrieve d (LegacyChunks _) = Legacy.retrieve locations d
retrieve d _ = simplyPrepare $ byteRetriever $ \k sink ->
sink =<< liftIO (L.readFile =<< getLocation d k)
retrieveCheap :: FilePath -> ChunkConfig -> Key -> FilePath -> Annex Bool
-- no cheap retrieval possible for chunks
retrieveCheap _ (UnpaddedChunks _) _ _ = return False
retrieveCheap _ (LegacyChunks _) _ _ = return False
#ifndef mingw32_HOST_OS
retrieveCheap d NoChunks k f = liftIO $ catchBoolIO $ do
file <- getLocation d k
createSymbolicLink file f
return True
#else
retrieveCheap _ _ _ _ = return False
#endif
remove :: FilePath -> Remover
remove d k = liftIO $ removeDirGeneric d (storeDir d k)
{- Removes the directory, which must be located under the topdir.
-
- Succeeds even on directories and contents that do not have write
- permission.
-
- If the directory does not exist, succeeds as long as the topdir does
- exist. If the topdir does not exist, fails, because in this case the
- remote is not currently accessible and probably still has the content
- we were supposed to remove from it.
-}
removeDirGeneric :: FilePath -> FilePath -> IO Bool
removeDirGeneric topdir dir = do
void $ tryIO $ allowWrite dir
#ifdef mingw32_HOST_OS
{- Windows needs the files inside the directory to be writable
- before it can delete them. -}
void $ tryIO $ mapM_ allowWrite =<< dirContents dir
#endif
ok <- catchBoolIO $ do
removeDirectoryRecursive dir
return True
if ok
then return ok
else doesDirectoryExist topdir <&&> (not <$> doesDirectoryExist dir)
checkKey :: FilePath -> ChunkConfig -> CheckPresent
checkKey d (LegacyChunks _) k = Legacy.checkKey d locations k
checkKey d _ k = liftIO $
ifM (anyM doesFileExist (locations d k))
( return True
, ifM (doesDirectoryExist d)
( return False
, error $ "directory " ++ d ++ " is not accessible"
)
)
|
