208 lines
6.7 KiB
Haskell
208 lines
6.7 KiB
Haskell
{- A "remote" that is just a filesystem directory.
|
|
-
|
|
- Copyright 2011-2014 Joey Hess <id@joeyh.name>
|
|
-
|
|
- 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" }
|
|
, getInfo = return [("directory", dir)]
|
|
, claimUrl = Nothing
|
|
, checkUrl = Nothing
|
|
}
|
|
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', _encsetup) <- 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"
|
|
)
|
|
)
|