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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 as L
import qualified Data.Map as M
import System.Posix.Process (getProcessID)
import Common.Annex
import Types.Remote
import qualified Git
import Config
import Annex.Content
import Remote.Helper.Special
import Remote.Helper.Encryptable
import Crypto
import Utility.RsyncFile
import Annex.Perms
type RsyncUrl = String
data RsyncOpts = RsyncOpts
{ rsyncUrl :: RsyncUrl
, rsyncOptions :: [CommandParam]
, rsyncShellEscape :: Bool
}
remote :: RemoteType
remote = RemoteType {
typename = "rsync",
enumerate = findSpecialRemotes "rsyncurl",
generate = gen,
setup = rsyncSetup
}
gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex Remote
gen r u c = do
o <- genRsyncOpts r c
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
, retrieveKeyFileCheap = retrieveCheap o
, removeKey = remove o
, hasKey = checkPresent r o
, hasKeyCheap = False
, whereisKey = Nothing
, config = Nothing
, repo = r
, localpath = if rsyncUrlIsPath $ rsyncUrl o
then Just $ rsyncUrl o
else Nothing
, readonly = False
, remotetype = remote
}
genRsyncOpts :: Git.Repo -> Maybe RemoteConfig -> Annex RsyncOpts
genRsyncOpts r c = do
url <- getRemoteConfig r "rsyncurl" (error "missing rsyncurl")
opts <- map Param . filter safe . words
<$> getRemoteConfig r "rsync-options" ""
let escape = maybe True (\m -> M.lookup "shellescape" m /= Just "no") c
return $ RsyncOpts url opts escape
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'
rsyncEscape :: RsyncOpts -> String -> String
rsyncEscape o s
| rsyncShellEscape o && rsyncUrlIsShell (rsyncUrl o) = shellEscape s
| otherwise = s
rsyncUrls :: RsyncOpts -> Key -> [String]
rsyncUrls o k = map use annexHashes
where
use h = rsyncUrl o </> h k </> rsyncEscape o (f </> f)
f = keyFile k
store :: RsyncOpts -> Key -> AssociatedFile -> Annex Bool
store o k _f = rsyncSend o k <=< inRepo $ gitAnnexLocation k
storeEncrypted :: RsyncOpts -> (Cipher, Key) -> Key -> Annex Bool
storeEncrypted o (cipher, enck) k = withTmp enck $ \tmp -> do
src <- inRepo $ gitAnnexLocation k
liftIO $ withEncryptedContent cipher (L.readFile src) $ L.writeFile tmp
rsyncSend o enck tmp
retrieve :: RsyncOpts -> Key -> AssociatedFile -> FilePath -> Annex Bool
retrieve o k _ f = untilTrue (rsyncUrls o k) $ \u -> rsyncRemote o
-- use inplace when retrieving to support resuming
[ Param "--inplace"
, Param u
, Param f
]
retrieveCheap :: RsyncOpts -> Key -> FilePath -> Annex Bool
retrieveCheap o k f = ifM (preseedTmp k f) ( retrieve o k undefined f , return False )
retrieveEncrypted :: RsyncOpts -> (Cipher, Key) -> Key -> FilePath -> Annex Bool
retrieveEncrypted o (cipher, enck) _ f = withTmp enck $ \tmp -> do
ifM (retrieve o enck undefined tmp)
( liftIO $ catchBoolIO $ do
withDecryptedContent cipher (L.readFile tmp) $ L.writeFile f
return True
, return False
)
remove :: RsyncOpts -> Key -> Annex Bool
remove o k = withRsyncScratchDir $ \tmp -> liftIO $ do
{- Send an empty directory to rysnc to make it delete. -}
let dummy = tmp </> keyFile k
createDirectoryIfMissing True dummy
rsync $ rsyncOptions o ++
map (\s -> Param $ "--include=" ++ s) includes ++
[ Param "--exclude=*" -- exclude everything else
, Params "--quiet --delete --recursive"
, partialParams
, Param $ addTrailingPathSeparator dummy
, Param $ rsyncUrl o
]
where
{- Specify include rules to match the directories where the
- content could be. Note that the parent directories have
- to also be explicitly included, due to how rsync
- traverses directories. -}
includes = concatMap use annexHashes
use h = let dir = h k in
[ parentDir dir
, dir
-- match content directory and anything in it
, dir </> keyFile k </> "***"
]
checkPresent :: Git.Repo -> RsyncOpts -> Key -> Annex (Either String Bool)
checkPresent r o k = do
showAction $ "checking " ++ Git.repoDescribe r
-- note: Does not currently differentiate between rsync failing
-- to connect, and the file not being present.
Right <$> check
where
check = untilTrue (rsyncUrls o k) $ \u ->
liftIO $ boolSystem "sh" [Param "-c", Param (cmd u)]
cmd u = "rsync --quiet " ++ shellEscape u ++ " 2>/dev/null"
{- Rsync params to enable resumes of sending files safely,
- ensure that files are only moved into place once complete
-}
partialParams :: CommandParam
partialParams = Params "--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
pid <- liftIO getProcessID
t <- fromRepo gitAnnexTmpDir
createAnnexDirectory t
let tmp = t </> "rsynctmp" </> show pid
nuke tmp
liftIO $ createDirectoryIfMissing True tmp
nuke tmp `after` a tmp
where
nuke d = liftIO $ whenM (doesDirectoryExist d) $
removeDirectoryRecursive d
rsyncRemote :: RsyncOpts -> [CommandParam] -> Annex Bool
rsyncRemote o params = do
showOutput -- make way for progress bar
ifM (liftIO $ rsync $ rsyncOptions o ++ defaultParams ++ params)
( return True
, do
showLongNote "rsync failed -- run git annex again to resume file transfer"
return False
)
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 </> Prelude.head (keyPaths k)
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
]
|
