561 lines
18 KiB
Haskell
561 lines
18 KiB
Haskell
{- Standard git remotes.
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-
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- Copyright 2011-2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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{-# LANGUAGE CPP #-}
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module Remote.Git (
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remote,
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configRead,
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repoAvail,
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) where
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import Common.Annex
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import Annex.Ssh
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import Types.Remote
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import Types.GitConfig
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import qualified Git
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import qualified Git.Config
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import qualified Git.Construct
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import qualified Git.Command
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import qualified Git.GCrypt
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import qualified Git.Types as Git
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import qualified Annex
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import Logs.Presence
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import Annex.Transfer
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import Annex.UUID
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import Annex.Exception
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import qualified Annex.Content
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import qualified Annex.BranchState
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import qualified Annex.Branch
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import qualified Annex.Url as Url
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import Utility.Tmp
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import Config
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import Config.Cost
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import Annex.Init
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import Types.Key
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import Types.CleanupActions
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import qualified CmdLine.GitAnnexShell.Fields as Fields
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import Logs.Location
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import Utility.Metered
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#ifndef mingw32_HOST_OS
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import Utility.CopyFile
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#endif
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import Utility.Env
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import Utility.Batch
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import Remote.Helper.Git
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import Remote.Helper.Messages
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import qualified Remote.Helper.Ssh as Ssh
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import qualified Remote.GCrypt
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import Config.Files
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import Creds
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import Control.Concurrent
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import Control.Concurrent.MSampleVar
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import qualified Data.Map as M
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import Control.Exception.Extensible
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remote :: RemoteType
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remote = RemoteType {
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typename = "git",
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enumerate = list,
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generate = gen,
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setup = gitSetup
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}
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list :: Annex [Git.Repo]
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list = do
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c <- fromRepo Git.config
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rs <- mapM (tweakurl c) =<< fromRepo Git.remotes
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mapM configRead rs
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where
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annexurl n = "remote." ++ n ++ ".annexurl"
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tweakurl c r = do
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let n = fromJust $ Git.remoteName r
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case M.lookup (annexurl n) c of
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Nothing -> return r
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Just url -> inRepo $ \g ->
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Git.Construct.remoteNamed n $
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Git.Construct.fromRemoteLocation url g
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{- Git remotes are normally set up using standard git command, not
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- git-annex initremote and enableremote.
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-
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- For initremote, the git remote must already be set up, and have a uuid.
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- Initremote simply remembers its location.
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-
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- enableremote simply sets up a git remote using the stored location.
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- No attempt is made to make the remote be accessible via ssh key setup,
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- etc.
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-}
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gitSetup :: Maybe UUID -> Maybe CredPair -> RemoteConfig -> Annex (RemoteConfig, UUID)
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gitSetup Nothing _ c = do
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let location = fromMaybe (error "Specify location=url") $
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Url.parseURIRelaxed =<< M.lookup "location" c
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g <- Annex.gitRepo
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u <- case filter (\r -> Git.location r == Git.Url location) (Git.remotes g) of
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[r] -> getRepoUUID r
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[] -> error "could not find existing git remote with specified location"
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_ -> error "found multiple git remotes with specified location"
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return (c, u)
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gitSetup (Just u) _ c = do
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inRepo $ Git.Command.run
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[ Param "remote"
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, Param "add"
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, Param $ fromMaybe (error "no name") (M.lookup "name" c)
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, Param $ fromMaybe (error "no location") (M.lookup "location" c)
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]
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return (c, u)
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{- It's assumed to be cheap to read the config of non-URL remotes, so this is
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- done each time git-annex is run in a way that uses remotes.
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-
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- Conversely, the config of an URL remote is only read when there is no
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- cached UUID value. -}
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configRead :: Git.Repo -> Annex Git.Repo
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configRead r = do
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gc <- Annex.getRemoteGitConfig r
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u <- getRepoUUID r
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case (repoCheap r, remoteAnnexIgnore gc, u) of
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(_, True, _) -> return r
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(True, _, _) -> tryGitConfigRead r
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(False, _, NoUUID) -> tryGitConfigRead r
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_ -> return r
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gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
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gen r u c gc
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| Git.GCrypt.isEncrypted r = Remote.GCrypt.gen r u c gc
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| otherwise = go <$> remoteCost gc defcst
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where
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defcst = if repoCheap r then cheapRemoteCost else expensiveRemoteCost
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go cst = Just new
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where
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new = Remote
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{ uuid = u
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, cost = cst
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, name = Git.repoDescribe r
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, storeKey = copyToRemote new
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, retrieveKeyFile = copyFromRemote new
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, retrieveKeyFileCheap = copyFromRemoteCheap new
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, removeKey = dropKey new
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, hasKey = inAnnex new
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, hasKeyCheap = repoCheap r
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, whereisKey = Nothing
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, remoteFsck = if Git.repoIsUrl r
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then Nothing
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else Just $ fsckOnRemote r
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, repairRepo = if Git.repoIsUrl r
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then Nothing
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else Just $ repairRemote r
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, config = c
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, localpath = localpathCalc r
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, repo = r
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, gitconfig = gc
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{ remoteGitConfig = Just $ extractGitConfig r }
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, readonly = Git.repoIsHttp r
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, availability = availabilityCalc r
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, remotetype = remote
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}
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{- Checks relatively inexpensively if a repository is available for use. -}
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repoAvail :: Git.Repo -> Annex Bool
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repoAvail r
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| Git.repoIsHttp r = return True
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| Git.GCrypt.isEncrypted r = do
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g <- gitRepo
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liftIO $ do
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er <- Git.GCrypt.encryptedRemote g r
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if Git.repoIsLocal er || Git.repoIsLocalUnknown er
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then catchBoolIO $
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void (Git.Config.read er) >> return True
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else return True
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| Git.repoIsUrl r = return True
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| Git.repoIsLocalUnknown r = return False
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| otherwise = liftIO $ isJust <$> catchMaybeIO (Git.Config.read r)
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{- Tries to read the config for a specified remote, updates state, and
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- returns the updated repo. -}
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tryGitConfigRead :: Git.Repo -> Annex Git.Repo
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tryGitConfigRead r
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| haveconfig r = return r -- already read
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| Git.repoIsSsh r = store $ do
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v <- Ssh.onRemote r (pipedconfig, Left undefined) "configlist" [] []
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case v of
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Right r'
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| haveconfig r' -> return r'
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| otherwise -> configlist_failed
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Left _ -> configlist_failed
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| Git.repoIsHttp r = store geturlconfig
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| Git.GCrypt.isEncrypted r = handlegcrypt =<< getConfigMaybe (remoteConfig r "uuid")
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| Git.repoIsUrl r = return r
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| otherwise = store $ safely $ do
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s <- Annex.new r
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Annex.eval s $ do
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Annex.BranchState.disableUpdate
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ensureInitialized
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Annex.getState Annex.repo
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where
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haveconfig = not . M.null . Git.config
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-- Reading config can fail due to IO error or
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-- for other reasons; catch all possible exceptions.
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safely a = either (const $ return r) return
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=<< liftIO (try a :: IO (Either SomeException Git.Repo))
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pipedconfig cmd params = do
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v <- Git.Config.fromPipe r cmd params
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case v of
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Right (r', val) -> do
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when (getUncachedUUID r' == NoUUID && not (null val)) $ do
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warningIO $ "Failed to get annex.uuid configuration of repository " ++ Git.repoDescribe r
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warningIO $ "Instead, got: " ++ show val
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warningIO $ "This is unexpected; please check the network transport!"
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return $ Right r'
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Left l -> return $ Left l
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geturlconfig = do
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uo <- Url.getUrlOptions
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v <- liftIO $ withTmpFile "git-annex.tmp" $ \tmpfile h -> do
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hClose h
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ifM (Url.downloadQuiet (Git.repoLocation r ++ "/config") tmpfile uo)
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( pipedconfig "git" [Param "config", Param "--null", Param "--list", Param "--file", File tmpfile]
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, return $ Left undefined
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)
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case v of
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Left _ -> do
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set_ignore "not usable by git-annex" False
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return r
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Right r' -> do
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-- Cache when http remote is not bare for
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-- optimisation.
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unless (Git.Config.isBare r') $
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setremote "annex-bare" (Git.Config.boolConfig False)
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return r'
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store = observe $ \r' -> do
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g <- gitRepo
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let l = Git.remotes g
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let g' = g { Git.remotes = exchange l r' }
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Annex.changeState $ \s -> s { Annex.repo = g' }
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exchange [] _ = []
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exchange (old:ls) new
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| Git.remoteName old == Git.remoteName new =
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new : exchange ls new
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| otherwise =
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old : exchange ls new
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{- Is this remote just not available, or does
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- it not have git-annex-shell?
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- Find out by trying to fetch from the remote. -}
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configlist_failed = case Git.remoteName r of
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Nothing -> return r
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Just n -> do
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whenM (inRepo $ Git.Command.runBool [Param "fetch", Param "--quiet", Param n]) $ do
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set_ignore "does not have git-annex installed" True
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return r
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set_ignore msg longmessage = do
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let k = "annex-ignore"
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case Git.remoteName r of
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Nothing -> noop
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Just n -> do
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warning $ "Remote " ++ n ++ " " ++ msg ++ "; setting " ++ k
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when longmessage $
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warning $ "This could be a problem with the git-annex installation on the remote. Please make sure that git-annex-shell is available in PATH when you ssh into the remote. Once you have fixed the git-annex installation, run: git config remote." ++ n ++ "." ++ k ++ " false"
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setremote k (Git.Config.boolConfig True)
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setremote k v = case Git.remoteName r of
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Nothing -> noop
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Just n -> do
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let k' = "remote." ++ n ++ "." ++ k
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inRepo $ Git.Command.run [Param "config", Param k', Param v]
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handlegcrypt Nothing = return r
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handlegcrypt (Just _cacheduuid) = do
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-- Generate UUID from the gcrypt-id
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g <- gitRepo
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case Git.GCrypt.remoteRepoId g (Git.remoteName r) of
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Nothing -> return r
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Just v -> store $ liftIO $ setUUID r $
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genUUIDInNameSpace gCryptNameSpace v
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{- Checks if a given remote has the content for a key inAnnex.
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- If the remote cannot be accessed, or if it cannot determine
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- whether it has the content, returns a Left error message.
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-}
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inAnnex :: Remote -> Key -> Annex (Either String Bool)
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inAnnex rmt key
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| Git.repoIsHttp r = checkhttp
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| Git.repoIsUrl r = checkremote
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| otherwise = checklocal
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where
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r = repo rmt
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checkhttp = do
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showChecking r
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ifM (Url.withUrlOptions $ \uo -> anyM (\u -> Url.checkBoth u (keySize key) uo) (keyUrls rmt key))
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( return $ Right True
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, return $ Left "not found"
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)
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checkremote = Ssh.inAnnex r key
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checklocal = guardUsable r (cantCheck r) $ dispatch <$> check
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where
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check = either (Left . show) Right
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<$> tryAnnex (onLocal rmt $ Annex.Content.inAnnexSafe key)
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dispatch (Left e) = Left e
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dispatch (Right (Just b)) = Right b
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dispatch (Right Nothing) = cantCheck r
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keyUrls :: Remote -> Key -> [String]
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keyUrls r key = map tourl locs'
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where
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tourl l = Git.repoLocation (repo r) ++ "/" ++ l
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-- If the remote is known to not be bare, try the hash locations
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-- used for non-bare repos first, as an optimisation.
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locs
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| remoteAnnexBare (gitconfig r) == Just False = reverse (annexLocations key)
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| otherwise = annexLocations key
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#ifndef mingw32_HOST_OS
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locs' = locs
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#else
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locs' = map (replace "\\" "/") locs
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#endif
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dropKey :: Remote -> Key -> Annex Bool
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dropKey r key
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| not $ Git.repoIsUrl (repo r) =
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guardUsable (repo r) False $ commitOnCleanup r $ onLocal r $ do
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ensureInitialized
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whenM (Annex.Content.inAnnex key) $ do
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Annex.Content.lockContent key $
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Annex.Content.removeAnnex key
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logStatus key InfoMissing
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Annex.Content.saveState True
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return True
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| Git.repoIsHttp (repo r) = error "dropping from http remote not supported"
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| otherwise = commitOnCleanup r $ Ssh.dropKey (repo r) key
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{- Tries to copy a key's content from a remote's annex to a file. -}
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copyFromRemote :: Remote -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex Bool
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copyFromRemote r key file dest _p = copyFromRemote' r key file dest
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copyFromRemote' :: Remote -> Key -> AssociatedFile -> FilePath -> Annex Bool
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copyFromRemote' r key file dest
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| not $ Git.repoIsUrl (repo r) = guardUsable (repo r) False $ do
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params <- Ssh.rsyncParams r Download
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u <- getUUID
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-- run copy from perspective of remote
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onLocal r $ do
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ensureInitialized
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v <- Annex.Content.prepSendAnnex key
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case v of
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Nothing -> return False
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Just (object, checksuccess) ->
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runTransfer (Transfer Download u key) file noRetry
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(rsyncOrCopyFile params object dest)
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<&&> checksuccess
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| Git.repoIsSsh (repo r) = feedprogressback $ \feeder -> do
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direct <- isDirect
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Ssh.rsyncHelper (Just feeder)
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=<< Ssh.rsyncParamsRemote direct r Download key dest file
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| Git.repoIsHttp (repo r) = Annex.Content.downloadUrl (keyUrls r key) dest
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| otherwise = error "copying from non-ssh, non-http remote not supported"
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where
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{- Feed local rsync's progress info back to the remote,
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- by forking a feeder thread that runs
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- git-annex-shell transferinfo at the same time
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- git-annex-shell sendkey is running.
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-
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- To avoid extra password prompts, this is only done when ssh
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- connection caching is supported.
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- Note that it actually waits for rsync to indicate
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- progress before starting transferinfo, in order
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- to ensure ssh connection caching works and reuses
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- the connection set up for the sendkey.
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-
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- Also note that older git-annex-shell does not support
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- transferinfo, so stderr is dropped and failure ignored.
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-}
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feedprogressback a = ifM (isJust <$> sshCacheDir)
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( feedprogressback' a
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, a $ const noop
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)
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feedprogressback' a = do
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u <- getUUID
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let fields = (Fields.remoteUUID, fromUUID u)
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: maybe [] (\f -> [(Fields.associatedFile, f)]) file
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Just (cmd, params) <- Ssh.git_annex_shell (repo r) "transferinfo"
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[Param $ key2file key] fields
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v <- liftIO (newEmptySV :: IO (MSampleVar Integer))
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tid <- liftIO $ forkIO $ void $ tryIO $ do
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bytes <- readSV v
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p <- createProcess $
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(proc cmd (toCommand params))
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{ std_in = CreatePipe
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, std_err = CreatePipe
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}
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hClose $ stderrHandle p
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let h = stdinHandle p
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let send b = do
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hPrint h b
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hFlush h
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send bytes
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forever $
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send =<< readSV v
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let feeder = writeSV v . fromBytesProcessed
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bracketIO noop (const $ tryIO $ killThread tid) (const $ a feeder)
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copyFromRemoteCheap :: Remote -> Key -> FilePath -> Annex Bool
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#ifndef mingw32_HOST_OS
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copyFromRemoteCheap r key file
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| not $ Git.repoIsUrl (repo r) = guardUsable (repo r) False $ do
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loc <- liftIO $ gitAnnexLocation key (repo r) $
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fromJust $ remoteGitConfig $ gitconfig r
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liftIO $ catchBoolIO $ createSymbolicLink loc file >> return True
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| Git.repoIsSsh (repo r) =
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ifM (Annex.Content.preseedTmp key file)
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( copyFromRemote' r key Nothing file
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, return False
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)
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| otherwise = return False
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#else
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copyFromRemoteCheap _ _ _ = return False
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#endif
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{- Tries to copy a key's content to a remote's annex. -}
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copyToRemote :: Remote -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
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copyToRemote r key file p
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| not $ Git.repoIsUrl (repo r) =
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guardUsable (repo r) False $ commitOnCleanup r $
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copylocal =<< Annex.Content.prepSendAnnex key
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| Git.repoIsSsh (repo r) = commitOnCleanup r $
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Annex.Content.sendAnnex key noop $ \object -> do
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direct <- isDirect
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Ssh.rsyncHelper (Just p)
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=<< Ssh.rsyncParamsRemote direct r Upload key object file
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| otherwise = error "copying to non-ssh repo not supported"
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where
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copylocal Nothing = return False
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copylocal (Just (object, checksuccess)) = do
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-- The checksuccess action is going to be run in
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-- the remote's Annex, but it needs access to the current
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-- Annex monad's state.
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checksuccessio <- Annex.withCurrentState checksuccess
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params <- Ssh.rsyncParams r Upload
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u <- getUUID
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-- run copy from perspective of remote
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onLocal r $ ifM (Annex.Content.inAnnex key)
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( return True
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, do
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ensureInitialized
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runTransfer (Transfer Download u key) file noRetry $ const $
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Annex.Content.saveState True `after`
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Annex.Content.getViaTmpChecked (liftIO checksuccessio) key
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(\d -> rsyncOrCopyFile params object d p)
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)
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fsckOnRemote :: Git.Repo -> [CommandParam] -> Annex (IO Bool)
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fsckOnRemote r params
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| Git.repoIsUrl r = do
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s <- Ssh.git_annex_shell r "fsck" params []
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return $ case s of
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Nothing -> return False
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Just (c, ps) -> batchCommand c ps
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| otherwise = return $ do
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program <- readProgramFile
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r' <- Git.Config.read r
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environ <- getEnvironment
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let environ' = addEntries
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[ ("GIT_WORK_TREE", Git.repoPath r')
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, ("GIT_DIR", Git.localGitDir r')
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] environ
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batchCommandEnv program (Param "fsck" : params) $ Just environ'
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{- The passed repair action is run in the Annex monad of the remote. -}
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repairRemote :: Git.Repo -> Annex Bool -> Annex (IO Bool)
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repairRemote r a = return $ do
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s <- Annex.new r
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Annex.eval s $ do
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Annex.BranchState.disableUpdate
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ensureInitialized
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a
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{- Runs an action from the perspective of a local remote.
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-
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- The AnnexState is cached for speed and to avoid resource leaks.
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-
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- The repository's git-annex branch is not updated, as an optimisation.
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|
- No caller of onLocal can query data from the branch and be ensured
|
|
- it gets a current value. Caller of onLocal can make changes to
|
|
- the branch, however.
|
|
-}
|
|
onLocal :: Remote -> Annex a -> Annex a
|
|
onLocal r a = do
|
|
m <- Annex.getState Annex.remoteannexstate
|
|
case M.lookup (uuid r) m of
|
|
Nothing -> do
|
|
st <- liftIO $ Annex.new (repo r)
|
|
go st $ do
|
|
Annex.BranchState.disableUpdate
|
|
a
|
|
Just st -> go st a
|
|
where
|
|
cache st = Annex.changeState $ \s -> s
|
|
{ Annex.remoteannexstate = M.insert (uuid r) st (Annex.remoteannexstate s) }
|
|
go st a' = do
|
|
(ret, st') <- liftIO $ Annex.run st a'
|
|
cache st'
|
|
return ret
|
|
|
|
{- Copys a file with rsync unless both locations are on the same
|
|
- filesystem. Then cp could be faster. -}
|
|
rsyncOrCopyFile :: [CommandParam] -> FilePath -> FilePath -> MeterUpdate -> Annex Bool
|
|
rsyncOrCopyFile rsyncparams src dest p =
|
|
#ifdef mingw32_HOST_OS
|
|
dorsync
|
|
where
|
|
#else
|
|
ifM (sameDeviceIds src dest) (docopy, dorsync)
|
|
where
|
|
sameDeviceIds a b = (==) <$> getDeviceId a <*> getDeviceId b
|
|
getDeviceId f = deviceID <$> liftIO (getFileStatus $ parentDir f)
|
|
docopy = liftIO $ bracket
|
|
(forkIO $ watchfilesize zeroBytesProcessed)
|
|
(void . tryIO . killThread)
|
|
(const $ copyFileExternal src dest)
|
|
watchfilesize oldsz = do
|
|
threadDelay 500000 -- 0.5 seconds
|
|
v <- catchMaybeIO $
|
|
toBytesProcessed . fileSize
|
|
<$> getFileStatus dest
|
|
case v of
|
|
Just sz
|
|
| sz /= oldsz -> do
|
|
p sz
|
|
watchfilesize sz
|
|
_ -> watchfilesize oldsz
|
|
#endif
|
|
dorsync = Ssh.rsyncHelper (Just p) $
|
|
rsyncparams ++ [File src, File dest]
|
|
|
|
commitOnCleanup :: Remote -> Annex a -> Annex a
|
|
commitOnCleanup r a = go `after` a
|
|
where
|
|
go = Annex.addCleanup (RemoteCleanup $ uuid r) cleanup
|
|
cleanup
|
|
| not $ Git.repoIsUrl (repo r) = onLocal r $
|
|
doQuietSideAction $
|
|
Annex.Branch.commit "update"
|
|
| otherwise = void $ do
|
|
Just (shellcmd, shellparams) <-
|
|
Ssh.git_annex_shell (repo r) "commit" [] []
|
|
|
|
-- Throw away stderr, since the remote may not
|
|
-- have a new enough git-annex shell to
|
|
-- support committing.
|
|
liftIO $ catchMaybeIO $
|
|
withQuietOutput createProcessSuccess $
|
|
proc shellcmd $
|
|
toCommand shellparams
|