36133f27c0
No behavior changes here, but this is groundwork for letting remotes such as borg vary untrust forcing depending on configuration.
903 lines
32 KiB
Haskell
903 lines
32 KiB
Haskell
{- External special remote interface.
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-
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- Copyright 2013-2020 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE BangPatterns #-}
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module Remote.External (remote) where
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import Remote.External.Types
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import Remote.External.AsyncExtension
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import qualified Annex
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import Annex.Common
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import qualified Annex.ExternalAddonProcess as AddonProcess
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import Types.Remote
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import Types.Export
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import Types.CleanupActions
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import Types.UrlContents
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import Types.ProposedAccepted
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import qualified Git
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import Config
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import Git.Config (boolConfig)
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import Annex.SpecialRemote.Config
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import Remote.Helper.Special
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import Remote.Helper.ExportImport
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import Remote.Helper.ReadOnly
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import Remote.Helper.Messages
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import Utility.Metered
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import Types.Transfer
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import Logs.PreferredContent.Raw
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import Logs.RemoteState
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import Logs.Web
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import Config.Cost
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import Annex.Content
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import Annex.Url
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import Annex.UUID
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import Creds
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import Control.Concurrent.STM
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import System.Log.Logger (debugM)
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import qualified Data.Map as M
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import qualified Data.Set as S
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remote :: RemoteType
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remote = specialRemoteType $ RemoteType
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{ typename = "external"
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, enumerate = const (findSpecialRemotes "externaltype")
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, generate = gen
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, configParser = remoteConfigParser
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, setup = externalSetup
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, exportSupported = checkExportSupported
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, importSupported = importUnsupported
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, thirdPartyPopulated = False
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}
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externaltypeField :: RemoteConfigField
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externaltypeField = Accepted "externaltype"
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readonlyField :: RemoteConfigField
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readonlyField = Accepted "readonly"
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gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> RemoteStateHandle -> Annex (Maybe Remote)
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gen r u rc gc rs
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-- readonly mode only downloads urls; does not use external program
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| externaltype == "readonly" = do
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c <- parsedRemoteConfig remote rc
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cst <- remoteCost gc expensiveRemoteCost
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mk c cst GloballyAvailable
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readonlyStorer
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retrieveUrl
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readonlyRemoveKey
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(checkKeyUrl r)
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Nothing
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(externalInfo externaltype)
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Nothing
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Nothing
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exportUnsupported
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exportUnsupported
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| otherwise = do
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c <- parsedRemoteConfig remote rc
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external <- newExternal externaltype (Just u) c (Just gc) (Just rs)
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Annex.addCleanupAction (RemoteCleanup u) $ stopExternal external
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cst <- getCost external r gc
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avail <- getAvailability external r gc
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exportsupported <- if exportTree c
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then checkExportSupported' external
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else return False
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let exportactions = if exportsupported
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then ExportActions
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{ storeExport = storeExportM external
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, retrieveExport = retrieveExportM external
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, removeExport = removeExportM external
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, versionedExport = False
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, checkPresentExport = checkPresentExportM external
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, removeExportDirectory = Just $ removeExportDirectoryM external
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, renameExport = renameExportM external
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}
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else exportUnsupported
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-- Cheap exportSupported that replaces the expensive
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-- checkExportSupported now that we've already checked it.
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let cheapexportsupported = if exportsupported
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then exportIsSupported
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else exportUnsupported
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mk c cst avail
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(storeKeyM external)
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(retrieveKeyFileM external)
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(removeKeyM external)
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(checkPresentM external)
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(Just (whereisKeyM external))
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(getInfoM external)
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(Just (claimUrlM external))
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(Just (checkUrlM external))
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exportactions
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cheapexportsupported
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where
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mk c cst avail tostore toretrieve toremove tocheckkey towhereis togetinfo toclaimurl tocheckurl exportactions cheapexportsupported = do
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let rmt = 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 = storeKeyDummy
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, retrieveKeyFile = retrieveKeyFileDummy
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, retrieveKeyFileCheap = Nothing
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-- External special remotes use many http libraries
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-- and have no protection against redirects to
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-- local private web servers, or in some cases
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-- to file:// urls.
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, retrievalSecurityPolicy = mkRetrievalVerifiableKeysSecure gc
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, removeKey = removeKeyDummy
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, lockContent = Nothing
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, checkPresent = checkPresentDummy
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, checkPresentCheap = False
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, exportActions = exportactions
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, importActions = importUnsupported
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, whereisKey = towhereis
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, remoteFsck = Nothing
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, repairRepo = Nothing
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, config = c
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, localpath = Nothing
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, getRepo = return r
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, gitconfig = gc
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, readonly = False
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, appendonly = False
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, untrustworthy = False
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, availability = avail
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, remotetype = remote
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{ exportSupported = cheapexportsupported }
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, mkUnavailable = gen r u rc
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(gc { remoteAnnexExternalType = Just "!dne!" }) rs
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, getInfo = togetinfo
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, claimUrl = toclaimurl
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, checkUrl = tocheckurl
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, remoteStateHandle = rs
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}
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return $ Just $ specialRemote c
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tostore
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toretrieve
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toremove
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tocheckkey
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rmt
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externaltype = fromMaybe (giveup "missing externaltype") (remoteAnnexExternalType gc)
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externalSetup :: SetupStage -> Maybe UUID -> Maybe CredPair -> RemoteConfig -> RemoteGitConfig -> Annex (RemoteConfig, UUID)
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externalSetup _ mu _ c gc = do
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u <- maybe (liftIO genUUID) return mu
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pc <- either giveup return $ parseRemoteConfig c lenientRemoteConfigParser
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let readonlyconfig = getRemoteConfigValue readonlyField pc == Just True
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let externaltype = if readonlyconfig
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then "readonly"
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else fromMaybe (giveup "Specify externaltype=") $
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getRemoteConfigValue externaltypeField pc
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(c', _encsetup) <- encryptionSetup c gc
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c'' <- if readonlyconfig
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then do
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-- Setting annex-readonly is not really necessary
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-- anymore, but older versions of git-annex used
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-- this, not externaltype=readonly, so still set
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-- it.
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setConfig (remoteAnnexConfig (fromJust (lookupName c)) "readonly") (boolConfig True)
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return c'
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else do
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pc' <- either giveup return $ parseRemoteConfig c' lenientRemoteConfigParser
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external <- newExternal externaltype (Just u) pc' (Just gc) Nothing
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-- Now that we have an external, ask it to LISTCONFIGS,
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-- and re-parse the RemoteConfig strictly, so we can
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-- error out if the user provided an unexpected config.
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_ <- either giveup return . parseRemoteConfig c'
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=<< strictRemoteConfigParser external
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handleRequest external INITREMOTE Nothing $ \case
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INITREMOTE_SUCCESS -> result ()
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INITREMOTE_FAILURE errmsg -> Just $ giveup $
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respErrorMessage "INITREMOTE" errmsg
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_ -> Nothing
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-- Any config changes the external made before
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-- responding to INITREMOTE need to be applied to
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-- the RemoteConfig.
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changes <- withExternalState external $
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liftIO . atomically . readTMVar . externalConfigChanges
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return (changes c')
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gitConfigSpecialRemote u c'' [("externaltype", externaltype)]
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return (M.delete readonlyField c'', u)
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checkExportSupported :: ParsedRemoteConfig -> RemoteGitConfig -> Annex Bool
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checkExportSupported c gc = do
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let externaltype = fromMaybe (giveup "Specify externaltype=") $
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remoteAnnexExternalType gc <|> getRemoteConfigValue externaltypeField c
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if externaltype == "readonly"
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then return False
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else checkExportSupported'
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=<< newExternal externaltype Nothing c (Just gc) Nothing
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checkExportSupported' :: External -> Annex Bool
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checkExportSupported' external = go `catchNonAsync` (const (return False))
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where
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go = handleRequest external EXPORTSUPPORTED Nothing $ \resp -> case resp of
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EXPORTSUPPORTED_SUCCESS -> result True
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EXPORTSUPPORTED_FAILURE -> result False
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UNSUPPORTED_REQUEST -> result False
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_ -> Nothing
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storeKeyM :: External -> Storer
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storeKeyM external = fileStorer $ \k f p ->
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either giveup return =<< go k f p
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where
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go k f p = handleRequestKey external (\sk -> TRANSFER Upload sk f) k (Just p) $ \resp ->
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case resp of
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TRANSFER_SUCCESS Upload k' | k == k' ->
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result (Right ())
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TRANSFER_FAILURE Upload k' errmsg | k == k' ->
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result (Left (respErrorMessage "TRANSFER" errmsg))
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_ -> Nothing
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retrieveKeyFileM :: External -> Retriever
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retrieveKeyFileM external = fileRetriever $ \d k p ->
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either giveup return =<< go d k p
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where
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go d k p = handleRequestKey external (\sk -> TRANSFER Download sk d) k (Just p) $ \resp ->
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case resp of
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TRANSFER_SUCCESS Download k'
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| k == k' -> result $ Right ()
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TRANSFER_FAILURE Download k' errmsg
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| k == k' -> result $ Left $
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respErrorMessage "TRANSFER" errmsg
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_ -> Nothing
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removeKeyM :: External -> Remover
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removeKeyM external k = either giveup return =<< go
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where
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go = handleRequestKey external REMOVE k Nothing $ \resp ->
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case resp of
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REMOVE_SUCCESS k'
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| k == k' -> result $ Right ()
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REMOVE_FAILURE k' errmsg
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| k == k' -> result $ Left $
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respErrorMessage "REMOVE" errmsg
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_ -> Nothing
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checkPresentM :: External -> CheckPresent
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checkPresentM external k = either giveup id <$> go
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where
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go = handleRequestKey external CHECKPRESENT k Nothing $ \resp ->
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case resp of
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CHECKPRESENT_SUCCESS k'
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| k' == k -> result $ Right True
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CHECKPRESENT_FAILURE k'
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| k' == k -> result $ Right False
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CHECKPRESENT_UNKNOWN k' errmsg
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| k' == k -> result $ Left $
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respErrorMessage "CHECKPRESENT" errmsg
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_ -> Nothing
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whereisKeyM :: External -> Key -> Annex [String]
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whereisKeyM external k = handleRequestKey external WHEREIS k Nothing $ \resp -> case resp of
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WHEREIS_SUCCESS s -> result [s]
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WHEREIS_FAILURE -> result []
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UNSUPPORTED_REQUEST -> result []
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_ -> Nothing
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storeExportM :: External -> FilePath -> Key -> ExportLocation -> MeterUpdate -> Annex ()
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storeExportM external f k loc p = either giveup return =<< go
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where
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go = handleRequestExport external loc req k (Just p) $ \resp -> case resp of
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TRANSFER_SUCCESS Upload k' | k == k' -> result $ Right ()
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TRANSFER_FAILURE Upload k' errmsg | k == k' ->
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result $ Left $ respErrorMessage "TRANSFER" errmsg
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UNSUPPORTED_REQUEST ->
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result $ Left "TRANSFEREXPORT not implemented by external special remote"
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_ -> Nothing
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req sk = TRANSFEREXPORT Upload sk f
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retrieveExportM :: External -> Key -> ExportLocation -> FilePath -> MeterUpdate -> Annex ()
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retrieveExportM external k loc d p = either giveup return =<< go
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where
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go = handleRequestExport external loc req k (Just p) $ \resp -> case resp of
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TRANSFER_SUCCESS Download k'
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| k == k' -> result $ Right ()
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TRANSFER_FAILURE Download k' errmsg
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| k == k' -> result $ Left $ respErrorMessage "TRANSFER" errmsg
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UNSUPPORTED_REQUEST ->
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result $ Left "TRANSFEREXPORT not implemented by external special remote"
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_ -> Nothing
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req sk = TRANSFEREXPORT Download sk d
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checkPresentExportM :: External -> Key -> ExportLocation -> Annex Bool
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checkPresentExportM external k loc = either giveup id <$> go
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where
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go = handleRequestExport external loc CHECKPRESENTEXPORT k Nothing $ \resp -> case resp of
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CHECKPRESENT_SUCCESS k'
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| k' == k -> result $ Right True
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CHECKPRESENT_FAILURE k'
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| k' == k -> result $ Right False
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CHECKPRESENT_UNKNOWN k' errmsg
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| k' == k -> result $ Left $
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respErrorMessage "CHECKPRESENT" errmsg
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UNSUPPORTED_REQUEST -> result $
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Left "CHECKPRESENTEXPORT not implemented by external special remote"
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_ -> Nothing
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removeExportM :: External -> Key -> ExportLocation -> Annex ()
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removeExportM external k loc = either giveup return =<< go
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where
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go = handleRequestExport external loc REMOVEEXPORT k Nothing $ \resp -> case resp of
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REMOVE_SUCCESS k'
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| k == k' -> result $ Right ()
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REMOVE_FAILURE k' errmsg
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| k == k' -> result $ Left $ respErrorMessage "REMOVE" errmsg
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UNSUPPORTED_REQUEST -> result $
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Left $ "REMOVEEXPORT not implemented by external special remote"
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_ -> Nothing
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removeExportDirectoryM :: External -> ExportDirectory -> Annex ()
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removeExportDirectoryM external dir = either giveup return =<< go
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where
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go = handleRequest external req Nothing $ \resp -> case resp of
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REMOVEEXPORTDIRECTORY_SUCCESS -> result $ Right ()
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REMOVEEXPORTDIRECTORY_FAILURE -> result $
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Left "failed to remove directory"
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UNSUPPORTED_REQUEST -> result $ Right ()
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_ -> Nothing
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req = REMOVEEXPORTDIRECTORY dir
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renameExportM :: External -> Key -> ExportLocation -> ExportLocation -> Annex (Maybe ())
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renameExportM external k src dest = either giveup return =<< go
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where
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go = handleRequestExport external src req k Nothing $ \resp -> case resp of
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RENAMEEXPORT_SUCCESS k'
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| k' == k -> result $ Right (Just ())
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RENAMEEXPORT_FAILURE k'
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| k' == k -> result $ Left "failed to rename exported file"
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UNSUPPORTED_REQUEST -> result (Right Nothing)
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_ -> Nothing
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req sk = RENAMEEXPORT sk dest
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{- Sends a Request to the external remote, and waits for it to generate
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- a Response. That is fed into the responsehandler, which should return
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- the action to run for it (or Nothing if there's a protocol error).
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-
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- While the external remote is processing the Request, it may send
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- any number of RemoteRequests, that are handled here.
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-
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- An external remote process can only handle one request at a time.
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- Concurrent requests will start up additional processes.
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-
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- May throw exceptions, for example on protocol errors, or
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- when the repository cannot be used.
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-}
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handleRequest :: External -> Request -> Maybe MeterUpdate -> ResponseHandler a -> Annex a
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handleRequest external req mp responsehandler =
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withExternalState external $ \st ->
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handleRequest' st external req mp responsehandler
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handleRequestKey :: External -> (SafeKey -> Request) -> Key -> Maybe MeterUpdate -> ResponseHandler a -> Annex a
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handleRequestKey external mkreq k mp responsehandler = case mkSafeKey k of
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Right sk -> handleRequest external (mkreq sk) mp responsehandler
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Left e -> giveup e
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{- Export location is first sent in an EXPORT message before
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- the main request. This is done because the ExportLocation can
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- contain spaces etc. -}
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handleRequestExport :: External -> ExportLocation -> (SafeKey -> Request) -> Key -> Maybe MeterUpdate -> ResponseHandler a -> Annex a
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handleRequestExport external loc mkreq k mp responsehandler = do
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withExternalState external $ \st -> do
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checkPrepared st external
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sendMessage st (EXPORT loc)
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handleRequestKey external mkreq k mp responsehandler
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handleRequest' :: ExternalState -> External -> Request -> Maybe MeterUpdate -> ResponseHandler a -> Annex a
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handleRequest' st external req mp responsehandler
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| needsPREPARE req = do
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checkPrepared st external
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go
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| otherwise = go
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where
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go = do
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sendMessage st req
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loop
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loop = receiveMessage st external responsehandler
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(\rreq -> Just $ handleRemoteRequest rreq >> loop)
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(\msg -> Just $ handleExceptionalMessage msg >> loop)
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handleRemoteRequest (PROGRESS bytesprocessed) =
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maybe noop (\a -> liftIO $ a bytesprocessed) mp
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handleRemoteRequest (DIRHASH k) =
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send $ VALUE $ fromRawFilePath $ hashDirMixed def k
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handleRemoteRequest (DIRHASH_LOWER k) =
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send $ VALUE $ fromRawFilePath $ hashDirLower def k
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handleRemoteRequest (SETCONFIG setting value) =
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liftIO $ atomically $ do
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ParsedRemoteConfig m c <- takeTMVar (externalConfig st)
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let !m' = M.insert
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(Accepted setting)
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(RemoteConfigValue (PassedThrough value))
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m
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let !c' = M.insert
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(Accepted setting)
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(Accepted value)
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c
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putTMVar (externalConfig st) (ParsedRemoteConfig m' c')
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f <- takeTMVar (externalConfigChanges st)
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let !f' = M.insert (Accepted setting) (Accepted value) . f
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putTMVar (externalConfigChanges st) f'
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handleRemoteRequest (GETCONFIG setting) = do
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value <- maybe "" fromProposedAccepted
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. (M.lookup (Accepted setting))
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. unparsedRemoteConfig
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<$> liftIO (atomically $ readTMVar $ externalConfig st)
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send $ VALUE value
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handleRemoteRequest (SETCREDS setting login password) = case (externalUUID external, externalGitConfig external) of
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(Just u, Just gc) -> do
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pc <- liftIO $ atomically $ takeTMVar (externalConfig st)
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pc' <- setRemoteCredPair' pc encryptionAlreadySetup gc
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(credstorage setting u)
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(Just (login, password))
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let configchanges = M.differenceWithKey
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(\_k a b -> if a == b then Nothing else Just a)
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(unparsedRemoteConfig pc')
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(unparsedRemoteConfig pc)
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void $ liftIO $ atomically $ do
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putTMVar (externalConfig st) pc'
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f <- takeTMVar (externalConfigChanges st)
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let !f' = M.union configchanges . f
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putTMVar (externalConfigChanges st) f'
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_ -> senderror "cannot send SETCREDS here"
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handleRemoteRequest (GETCREDS setting) = case (externalUUID external, externalGitConfig external) of
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(Just u, Just gc) -> do
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c <- liftIO $ atomically $ readTMVar $ externalConfig st
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creds <- fromMaybe ("", "") <$>
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getRemoteCredPair c gc (credstorage setting u)
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send $ CREDS (fst creds) (snd creds)
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_ -> senderror "cannot send GETCREDS here"
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handleRemoteRequest GETUUID = case externalUUID external of
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Just u -> send $ VALUE $ fromUUID u
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Nothing -> senderror "cannot send GETUUID here"
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handleRemoteRequest GETGITDIR =
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send . VALUE . fromRawFilePath =<< fromRepo Git.localGitDir
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handleRemoteRequest (SETWANTED expr) = case externalUUID external of
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Just u -> preferredContentSet u expr
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Nothing -> senderror "cannot send SETWANTED here"
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handleRemoteRequest GETWANTED = case externalUUID external of
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Just u -> do
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expr <- fromMaybe "" . M.lookup u
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<$> preferredContentMapRaw
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send $ VALUE expr
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Nothing -> senderror "cannot send GETWANTED here"
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handleRemoteRequest (SETSTATE key state) =
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case externalRemoteStateHandle external of
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Just h -> setRemoteState h key state
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Nothing -> senderror "cannot send SETSTATE here"
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handleRemoteRequest (GETSTATE key) =
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case externalRemoteStateHandle external of
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Just h -> do
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state <- fromMaybe ""
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<$> getRemoteState h key
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send $ VALUE state
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Nothing -> senderror "cannot send GETSTATE here"
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handleRemoteRequest (SETURLPRESENT key url) =
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setUrlPresent key url
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handleRemoteRequest (SETURLMISSING key url) =
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setUrlMissing key url
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handleRemoteRequest (SETURIPRESENT key uri) =
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withurl (SETURLPRESENT key) uri
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handleRemoteRequest (SETURIMISSING key uri) =
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withurl (SETURLMISSING key) uri
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handleRemoteRequest (GETURLS key prefix) = do
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mapM_ (send . VALUE) =<< getUrlsWithPrefix key prefix
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send (VALUE "") -- end of list
|
|
handleRemoteRequest (DEBUG msg) = liftIO $ debugM "external" msg
|
|
handleRemoteRequest (INFO msg) = showInfo msg
|
|
handleRemoteRequest (VERSION _) = senderror "too late to send VERSION"
|
|
|
|
handleExceptionalMessage (ERROR err) = giveup $ "external special remote error: " ++ err
|
|
|
|
send = sendMessage st
|
|
senderror = sendMessage st . ERROR
|
|
|
|
credstorage setting u = CredPairStorage
|
|
{ credPairFile = base
|
|
, credPairEnvironment = (base ++ "login", base ++ "password")
|
|
, credPairRemoteField = Accepted setting
|
|
}
|
|
where
|
|
base = replace "/" "_" $ fromUUID u ++ "-" ++ setting
|
|
|
|
withurl mk uri = handleRemoteRequest $ mk $
|
|
setDownloader (show uri) OtherDownloader
|
|
|
|
sendMessage :: (Sendable m, ToAsyncWrapped m) => ExternalState -> m -> Annex ()
|
|
sendMessage st m = liftIO $ externalSend st m
|
|
|
|
sendMessageAddonProcess :: Sendable m => AddonProcess.ExternalAddonProcess -> m -> IO ()
|
|
sendMessageAddonProcess p m = do
|
|
AddonProcess.protocolDebug p True line
|
|
hPutStrLn h line
|
|
hFlush h
|
|
where
|
|
h = AddonProcess.externalSend p
|
|
line = unwords $ formatMessage m
|
|
|
|
receiveMessageAddonProcess :: AddonProcess.ExternalAddonProcess -> IO (Maybe String)
|
|
receiveMessageAddonProcess p = do
|
|
v <- catchMaybeIO $ hGetLine $ AddonProcess.externalReceive p
|
|
maybe noop (AddonProcess.protocolDebug p False) v
|
|
return v
|
|
|
|
shutdownAddonProcess :: AddonProcess.ExternalAddonProcess -> Bool -> IO ()
|
|
shutdownAddonProcess = AddonProcess.externalShutdown
|
|
|
|
{- A response handler can yeild a result, or it can request that another
|
|
- message be consumed from the external. -}
|
|
data ResponseHandlerResult a
|
|
= Result a
|
|
| GetNextMessage (ResponseHandler a)
|
|
|
|
type ResponseHandler a = Response -> Maybe (Annex (ResponseHandlerResult a))
|
|
|
|
result :: a -> Maybe (Annex (ResponseHandlerResult a))
|
|
result = Just . return . Result
|
|
|
|
{- Waits for a message from the external remote, and passes it to the
|
|
- apppropriate handler.
|
|
-
|
|
- If the handler returns Nothing, this is a protocol error.-}
|
|
receiveMessage
|
|
:: ExternalState
|
|
-> External
|
|
-> ResponseHandler a
|
|
-> (RemoteRequest -> Maybe (Annex a))
|
|
-> (ExceptionalMessage -> Maybe (Annex a))
|
|
-> Annex a
|
|
receiveMessage st external handleresponse handlerequest handleexceptional =
|
|
go =<< liftIO (externalReceive st)
|
|
where
|
|
go Nothing = protocolError False "<EOF>"
|
|
go (Just s) = case parseMessage s :: Maybe Response of
|
|
Just resp -> case handleresponse resp of
|
|
Nothing -> protocolError True s
|
|
Just callback -> callback >>= \case
|
|
Result a -> return a
|
|
GetNextMessage handleresponse' ->
|
|
receiveMessage st external handleresponse' handlerequest handleexceptional
|
|
Nothing -> case parseMessage s :: Maybe RemoteRequest of
|
|
Just req -> maybe (protocolError True s) id (handlerequest req)
|
|
Nothing -> case parseMessage s :: Maybe ExceptionalMessage of
|
|
Just msg -> maybe (protocolError True s) id (handleexceptional msg)
|
|
Nothing -> protocolError False s
|
|
protocolError parsed s = do
|
|
warning $ "external special remote protocol error, unexpectedly received \"" ++ s ++ "\" " ++
|
|
if parsed
|
|
then "(command not allowed at this time)"
|
|
else "(unable to parse command)"
|
|
giveup "unable to use special remote due to protocol error"
|
|
|
|
{- While the action is running, the ExternalState provided to it will not
|
|
- be available to any other calls.
|
|
-
|
|
- Starts up a new process if no ExternalStates are available.
|
|
-
|
|
- If the action is interrupted by an async exception, the external process
|
|
- is in an unknown state, and may eg be still performing a transfer. So it
|
|
- is killed. The action should not normally throw any exception itself,
|
|
- unless perhaps there's a problem communicating with the external
|
|
- process.
|
|
-}
|
|
withExternalState :: External -> (ExternalState -> Annex a) -> Annex a
|
|
withExternalState external a = do
|
|
st <- get
|
|
r <- a st `onException` liftIO (externalShutdown st True)
|
|
put st -- only when no exception is thrown
|
|
return r
|
|
where
|
|
v = externalState external
|
|
|
|
get = do
|
|
ms <- liftIO $ atomically $ do
|
|
l <- readTVar v
|
|
case l of
|
|
[] -> return Nothing
|
|
(st:rest) -> do
|
|
writeTVar v rest
|
|
return (Just st)
|
|
maybe (startExternal external) return ms
|
|
|
|
put st = liftIO $ atomically $ modifyTVar' v (st:)
|
|
|
|
{- Starts an external remote process running, and checks VERSION and
|
|
- exchanges EXTENSIONS.
|
|
-
|
|
- When the ASYNC extension is negotiated, a single process is used,
|
|
- and this constructs a external state that communicates with a thread
|
|
- that relays to it.
|
|
-}
|
|
startExternal :: External -> Annex ExternalState
|
|
startExternal external =
|
|
liftIO (atomically $ takeTMVar (externalAsync external)) >>= \case
|
|
UncheckedExternalAsync -> do
|
|
(st, extensions) <- startExternal' external
|
|
`onException` store UncheckedExternalAsync
|
|
if asyncExtensionEnabled extensions
|
|
then do
|
|
annexrunner <- Annex.makeRunner
|
|
relay <- liftIO $ runRelayToExternalAsync external st annexrunner
|
|
st' <- liftIO $ asyncRelayExternalState relay
|
|
store (ExternalAsync relay)
|
|
return st'
|
|
else do
|
|
store NoExternalAsync
|
|
return st
|
|
v@NoExternalAsync -> do
|
|
store v
|
|
fst <$> startExternal' external
|
|
v@(ExternalAsync relay) -> do
|
|
store v
|
|
liftIO $ asyncRelayExternalState relay
|
|
where
|
|
store = liftIO . atomically . putTMVar (externalAsync external)
|
|
|
|
startExternal' :: External -> Annex (ExternalState, ExtensionList)
|
|
startExternal' external = do
|
|
pid <- liftIO $ atomically $ do
|
|
n <- succ <$> readTVar (externalLastPid external)
|
|
writeTVar (externalLastPid external) n
|
|
return n
|
|
AddonProcess.startExternalAddonProcess basecmd pid >>= \case
|
|
Left (AddonProcess.ProgramFailure err) -> do
|
|
unusable err
|
|
Left (AddonProcess.ProgramNotInstalled err) ->
|
|
case (lookupName (unparsedRemoteConfig (externalDefaultConfig external)), remoteAnnexReadOnly <$> externalGitConfig external) of
|
|
(Just rname, Just True) -> unusable $ unlines
|
|
[ err
|
|
, "This remote has annex-readonly=true, and previous versions of"
|
|
, "git-annex would tried to download from it without"
|
|
, "installing " ++ basecmd ++ ". If you want that, you need to set:"
|
|
, "git config remote." ++ rname ++ ".annex-externaltype readonly"
|
|
]
|
|
_ -> unusable err
|
|
Right p -> do
|
|
cv <- liftIO $ newTMVarIO $ externalDefaultConfig external
|
|
ccv <- liftIO $ newTMVarIO id
|
|
pv <- liftIO $ newTMVarIO Unprepared
|
|
let st = ExternalState
|
|
{ externalSend = sendMessageAddonProcess p
|
|
, externalReceive = receiveMessageAddonProcess p
|
|
, externalShutdown = shutdownAddonProcess p
|
|
, externalPrepared = pv
|
|
, externalConfig = cv
|
|
, externalConfigChanges = ccv
|
|
}
|
|
extensions <- startproto st
|
|
return (st, extensions)
|
|
where
|
|
basecmd = "git-annex-remote-" ++ externalType external
|
|
startproto st = do
|
|
receiveMessage st external
|
|
(const Nothing)
|
|
(checkVersion st)
|
|
(const Nothing)
|
|
sendMessage st (EXTENSIONS supportedExtensionList)
|
|
-- It responds with a EXTENSIONS_RESPONSE; that extensions
|
|
-- list is reserved for future expansion. UNSUPPORTED_REQUEST
|
|
-- is also accepted.
|
|
exwanted <- receiveMessage st external
|
|
(\resp -> case resp of
|
|
EXTENSIONS_RESPONSE l -> result l
|
|
UNSUPPORTED_REQUEST -> result mempty
|
|
_ -> Nothing
|
|
)
|
|
(const Nothing)
|
|
(const Nothing)
|
|
case filter (`notElem` fromExtensionList supportedExtensionList) (fromExtensionList exwanted) of
|
|
[] -> return exwanted
|
|
exrest -> unusable $ unwords $
|
|
[ basecmd
|
|
, "requested extensions that this version of git-annex does not support:"
|
|
] ++ exrest
|
|
|
|
unusable msg = do
|
|
warning msg
|
|
giveup ("unable to use external special remote " ++ basecmd)
|
|
|
|
stopExternal :: External -> Annex ()
|
|
stopExternal external = liftIO $ do
|
|
l <- atomically $ swapTVar (externalState external) []
|
|
mapM_ (flip externalShutdown False) l
|
|
|
|
checkVersion :: ExternalState -> RemoteRequest -> Maybe (Annex ())
|
|
checkVersion st (VERSION v) = Just $
|
|
if v `elem` supportedProtocolVersions
|
|
then noop
|
|
else sendMessage st (ERROR "unsupported VERSION")
|
|
checkVersion _ _ = Nothing
|
|
|
|
{- If repo has not been prepared, sends PREPARE.
|
|
-
|
|
- If the repo fails to prepare, or failed before, throws an exception with
|
|
- the error message. -}
|
|
checkPrepared :: ExternalState -> External -> Annex ()
|
|
checkPrepared st external = do
|
|
v <- liftIO $ atomically $ takeTMVar $ externalPrepared st
|
|
case v of
|
|
Prepared -> setprepared Prepared
|
|
FailedPrepare errmsg -> do
|
|
setprepared (FailedPrepare errmsg)
|
|
giveup errmsg
|
|
Unprepared ->
|
|
handleRequest' st external PREPARE Nothing $ \resp ->
|
|
case resp of
|
|
PREPARE_SUCCESS -> Just $ do
|
|
setprepared Prepared
|
|
return (Result ())
|
|
PREPARE_FAILURE errmsg -> Just $ do
|
|
let errmsg' = respErrorMessage "PREPARE" errmsg
|
|
setprepared $ FailedPrepare errmsg'
|
|
giveup errmsg'
|
|
_ -> Nothing
|
|
where
|
|
setprepared status = liftIO $ atomically $
|
|
putTMVar (externalPrepared st) status
|
|
|
|
respErrorMessage :: String -> String -> String
|
|
respErrorMessage req err
|
|
| null err = req ++ " failed with no reason given"
|
|
| otherwise = err
|
|
|
|
{- Caches the cost in the git config to avoid needing to start up an
|
|
- external special remote every time time just to ask it what its
|
|
- cost is. -}
|
|
getCost :: External -> Git.Repo -> RemoteGitConfig -> Annex Cost
|
|
getCost external r gc =
|
|
(go =<< remoteCost' gc) `catchNonAsync` const (pure defcst)
|
|
where
|
|
go (Just c) = return c
|
|
go Nothing = do
|
|
c <- handleRequest external GETCOST Nothing $ \req -> case req of
|
|
COST c -> result c
|
|
UNSUPPORTED_REQUEST -> result defcst
|
|
_ -> Nothing
|
|
setRemoteCost r c
|
|
return c
|
|
defcst = expensiveRemoteCost
|
|
|
|
{- Caches the availability in the git config to avoid needing to start up an
|
|
- external special remote every time time just to ask it what its
|
|
- availability is.
|
|
-
|
|
- Most remotes do not bother to implement a reply to this request;
|
|
- globally available is the default.
|
|
-}
|
|
getAvailability :: External -> Git.Repo -> RemoteGitConfig -> Annex Availability
|
|
getAvailability external r gc =
|
|
maybe (catchNonAsync query (const (pure defavail))) return
|
|
(remoteAnnexAvailability gc)
|
|
where
|
|
query = do
|
|
avail <- handleRequest external GETAVAILABILITY Nothing $ \req -> case req of
|
|
AVAILABILITY avail -> result avail
|
|
UNSUPPORTED_REQUEST -> result defavail
|
|
_ -> Nothing
|
|
setRemoteAvailability r avail
|
|
return avail
|
|
defavail = GloballyAvailable
|
|
|
|
claimUrlM :: External -> URLString -> Annex Bool
|
|
claimUrlM external url =
|
|
handleRequest external (CLAIMURL url) Nothing $ \req -> case req of
|
|
CLAIMURL_SUCCESS -> result True
|
|
CLAIMURL_FAILURE -> result False
|
|
UNSUPPORTED_REQUEST -> result False
|
|
_ -> Nothing
|
|
|
|
checkUrlM :: External -> URLString -> Annex UrlContents
|
|
checkUrlM external url =
|
|
handleRequest external (CHECKURL url) Nothing $ \req -> case req of
|
|
CHECKURL_CONTENTS sz f -> result $ UrlContents sz $
|
|
if null f then Nothing else Just f
|
|
CHECKURL_MULTI l -> result $ UrlMulti $ map mkmulti l
|
|
CHECKURL_FAILURE errmsg -> Just $ giveup $
|
|
respErrorMessage "CHECKURL" errmsg
|
|
UNSUPPORTED_REQUEST -> giveup "CHECKURL not implemented by external special remote"
|
|
_ -> Nothing
|
|
where
|
|
mkmulti (u, s, f) = (u, s, f)
|
|
|
|
retrieveUrl :: Retriever
|
|
retrieveUrl = fileRetriever $ \f k p -> do
|
|
us <- getWebUrls k
|
|
unlessM (withUrlOptions $ downloadUrl k p us f) $
|
|
giveup "failed to download content"
|
|
|
|
checkKeyUrl :: Git.Repo -> CheckPresent
|
|
checkKeyUrl r k = do
|
|
showChecking r
|
|
us <- getWebUrls k
|
|
anyM (\u -> withUrlOptions $ checkBoth u (fromKey keySize k)) us
|
|
|
|
getWebUrls :: Key -> Annex [URLString]
|
|
getWebUrls key = filter supported <$> getUrls key
|
|
where
|
|
supported u = snd (getDownloader u) == WebDownloader
|
|
|
|
externalInfo :: ExternalType -> Annex [(String, String)]
|
|
externalInfo et = return [("externaltype", et)]
|
|
|
|
getInfoM :: External -> Annex [(String, String)]
|
|
getInfoM external = (++)
|
|
<$> externalInfo (externalType external)
|
|
<*> handleRequest external GETINFO Nothing (collect [])
|
|
where
|
|
collect l req = case req of
|
|
INFOFIELD f -> Just $ return $
|
|
GetNextMessage $ collectvalue l f
|
|
INFOEND -> result (reverse l)
|
|
UNSUPPORTED_REQUEST -> result []
|
|
_ -> Nothing
|
|
|
|
collectvalue l f req = case req of
|
|
INFOVALUE v -> Just $ return $
|
|
GetNextMessage $ collect ((f, v) : l)
|
|
_ -> Nothing
|
|
|
|
{- All unknown configs are passed through in case the external program
|
|
- uses them. -}
|
|
lenientRemoteConfigParser :: RemoteConfigParser
|
|
lenientRemoteConfigParser =
|
|
addRemoteConfigParser specialRemoteConfigParsers baseRemoteConfigParser
|
|
|
|
baseRemoteConfigParser :: RemoteConfigParser
|
|
baseRemoteConfigParser = RemoteConfigParser
|
|
{ remoteConfigFieldParsers =
|
|
[ optionalStringParser externaltypeField
|
|
(FieldDesc "type of external special remote to use")
|
|
, trueFalseParser readonlyField (Just False)
|
|
(FieldDesc "enable readonly mode")
|
|
]
|
|
, remoteConfigRestPassthrough = Just
|
|
( const True
|
|
, [("*", FieldDesc "all other parameters are passed to external special remote program")]
|
|
)
|
|
}
|
|
|
|
{- When the remote supports LISTCONFIGS, only accept the ones it listed.
|
|
- When it does not, accept all configs. -}
|
|
strictRemoteConfigParser :: External -> Annex RemoteConfigParser
|
|
strictRemoteConfigParser external = listConfigs external >>= \case
|
|
Nothing -> return lenientRemoteConfigParser
|
|
Just l -> do
|
|
let s = S.fromList (map fst l)
|
|
let listed f = S.member (fromProposedAccepted f) s
|
|
return $ lenientRemoteConfigParser
|
|
{ remoteConfigRestPassthrough = Just (listed, l) }
|
|
|
|
listConfigs :: External -> Annex (Maybe [(Setting, FieldDesc)])
|
|
listConfigs external = handleRequest external LISTCONFIGS Nothing (collect [])
|
|
where
|
|
collect l req = case req of
|
|
CONFIG s d -> Just $ return $
|
|
GetNextMessage $ collect ((s, FieldDesc d) : l)
|
|
CONFIGEND -> result (Just (reverse l))
|
|
UNSUPPORTED_REQUEST -> result Nothing
|
|
_ -> Nothing
|
|
|
|
remoteConfigParser :: RemoteConfig -> Annex RemoteConfigParser
|
|
remoteConfigParser c
|
|
-- No need to start the external when there is no config to parse,
|
|
-- or when everything in the config was already accepted; in those
|
|
-- cases the lenient parser will do the same thing as the strict
|
|
-- parser.
|
|
| M.null (M.filter isproposed c) = return lenientRemoteConfigParser
|
|
| otherwise = case parseRemoteConfig c baseRemoteConfigParser of
|
|
Left _ -> return lenientRemoteConfigParser
|
|
Right pc -> case (getRemoteConfigValue externaltypeField pc, getRemoteConfigValue readonlyField pc) of
|
|
(Nothing, _) -> return lenientRemoteConfigParser
|
|
(_, Just True) -> return lenientRemoteConfigParser
|
|
(Just externaltype, _) -> do
|
|
external <- newExternal externaltype Nothing pc Nothing Nothing
|
|
strictRemoteConfigParser external
|
|
where
|
|
isproposed (Accepted _) = False
|
|
isproposed (Proposed _) = True
|