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|
{- A remote that is only accessible by rsync.
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Remote.Rsync (remote) where
import qualified Data.ByteString.Lazy.Char8 as L
import Control.Exception.Extensible (IOException)
import qualified Data.Map as M
import Control.Monad.State (liftIO)
import System.FilePath
import System.Directory
import System.Posix.Files
import System.Posix.Process
import Data.Maybe
import Types
import Types.Remote
import qualified Git
import qualified Annex
import UUID
import Locations
import Config
import Content
import Utility
import Remote.Special
import Remote.Encryptable
import Crypto
import Messages
import Utility.RsyncFile
type RsyncUrl = String
data RsyncOpts = RsyncOpts {
rsyncUrl :: RsyncUrl,
rsyncOptions :: [CommandParam]
}
remote :: RemoteType Annex
remote = RemoteType {
typename = "rsync",
enumerate = findSpecialRemotes "rsyncurl",
generate = gen,
setup = rsyncSetup
}
gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex (Remote Annex)
gen r u c = do
o <- genRsyncOpts r
cst <- remoteCost r expensiveRemoteCost
return $ encryptableRemote c
(storeEncrypted o)
(retrieveEncrypted o)
Remote {
uuid = u,
cost = cst,
name = Git.repoDescribe r,
storeKey = store o,
retrieveKeyFile = retrieve o,
removeKey = remove o,
hasKey = checkPresent r o,
hasKeyCheap = False,
config = Nothing
}
genRsyncOpts :: Git.Repo -> Annex RsyncOpts
genRsyncOpts r = do
url <- getConfig r "rsyncurl" (error "missing rsyncurl")
opts <- getConfig r "rsync-options" ""
return $ RsyncOpts url $ map Param $ filter safe $ words opts
where
safe o
-- Don't allow user to pass --delete to rsync;
-- that could cause it to delete other keys
-- in the same hash bucket as a key it sends.
| o == "--delete" = False
| o == "--delete-excluded" = False
| otherwise = True
rsyncSetup :: UUID -> RemoteConfig -> Annex RemoteConfig
rsyncSetup u c = do
-- verify configuration is sane
let url = fromMaybe (error "Specify rsyncurl=") $
M.lookup "rsyncurl" c
c' <- encryptionSetup c
-- The rsyncurl is stored in git config, not only in this remote's
-- persistant state, so it can vary between hosts.
gitConfigSpecialRemote u c' "rsyncurl" url
return c'
rsyncKey :: RsyncOpts -> Key -> String
rsyncKey o k = rsyncUrl o </> hashDirMixed k </> f </> f
where
f = keyFile k
store :: RsyncOpts -> Key -> Annex Bool
store o k = do
g <- Annex.gitRepo
rsyncSend o k (gitAnnexLocation g k)
storeEncrypted :: RsyncOpts -> (Cipher, Key) -> Key -> Annex Bool
storeEncrypted o (cipher, enck) k = withTmp enck $ \tmp -> do
g <- Annex.gitRepo
let f = gitAnnexLocation g k
liftIO $ withEncryptedContent cipher (L.readFile f) $ \s -> L.writeFile tmp s
rsyncSend o enck tmp
retrieve :: RsyncOpts -> Key -> FilePath -> Annex Bool
retrieve o k f = rsyncRemote o
-- use inplace when retrieving to support resuming
[ Param "--inplace"
, Param $ rsyncKey o k
, Param f
]
retrieveEncrypted :: RsyncOpts -> (Cipher, Key) -> FilePath -> Annex Bool
retrieveEncrypted o (cipher, enck) f = withTmp enck $ \tmp -> do
res <- retrieve o enck tmp
if res
then liftIO $ catchBool $ do
withDecryptedContent cipher (L.readFile tmp) $ L.writeFile f
return True
else return res
remove :: RsyncOpts -> Key -> Annex Bool
remove o k = withRsyncScratchDir $ \tmp -> do
{- Send an empty directory to rysnc as the parent directory
- of the file to remove. -}
let dummy = tmp </> keyFile k
liftIO $ createDirectoryIfMissing True dummy
liftIO $ rsync $ rsyncOptions o ++
[ Params "--delete --recursive"
, partialParams
, Param $ addTrailingPathSeparator dummy
, Param $ parentDir $ rsyncKey o k
]
checkPresent :: Git.Repo -> RsyncOpts -> Key -> Annex (Either IOException Bool)
checkPresent r o k = do
showAction $ "checking " ++ Git.repoDescribe r
-- note: Does not currently differnetiate between rsync failing
-- to connect, and the file not being present.
res <- liftIO $ boolSystem "sh" [Param "-c", Param cmd]
return $ Right res
where
cmd = "rsync --quiet " ++ testfile ++ " 2>/dev/null"
testfile = shellEscape $ rsyncKey o k
{- Rsync params to enable resumes of sending files safely,
- ensure that files are only moved into place once complete
-}
partialParams :: CommandParam
partialParams = Params "--no-inplace --partial --partial-dir=.rsync-partial"
{- Runs an action in an empty scratch directory that can be used to build
- up trees for rsync. -}
withRsyncScratchDir :: (FilePath -> Annex Bool) -> Annex Bool
withRsyncScratchDir a = do
g <- Annex.gitRepo
pid <- liftIO getProcessID
let tmp = gitAnnexTmpDir g </> "rsynctmp" </> show pid
nuke tmp
liftIO $ createDirectoryIfMissing True tmp
res <- a tmp
nuke tmp
return res
where
nuke d = liftIO $
doesDirectoryExist d >>? removeDirectoryRecursive d
rsyncRemote :: RsyncOpts -> [CommandParam] -> Annex Bool
rsyncRemote o params = do
showOutput -- make way for progress bar
res <- liftIO $ rsync $ rsyncOptions o ++ defaultParams ++ params
if res
then return res
else do
showLongNote "rsync failed -- run git annex again to resume file transfer"
return res
where
defaultParams = [Params "--progress"]
{- To send a single key is slightly tricky; need to build up a temporary
directory structure to pass to rsync so it can create the hash
directories. -}
rsyncSend :: RsyncOpts -> Key -> FilePath -> Annex Bool
rsyncSend o k src = withRsyncScratchDir $ \tmp -> do
let dest = tmp </> hashDirMixed k </> f </> f
liftIO $ createDirectoryIfMissing True $ parentDir dest
liftIO $ createLink src dest
rsyncRemote o
[ Param "--recursive"
, partialParams
-- tmp/ to send contents of tmp dir
, Param $ addTrailingPathSeparator tmp
, Param $ rsyncUrl o
]
where
f = keyFile k
|
