5b332a87be
Dropping from a cluster drops from every node of the cluster. Including nodes that the cluster does not think have the content. This is different from GET and CHECKPRESENT, which do trust the cluster's location log. The difference is that removing from a cluster should make 100% the content is gone from every node. So doing extra work is ok. Compare with CHECKPRESENT where checking every node could make it very expensive, and the worst that can happen in a false negative is extra work being done. Extended the P2P protocol with FAILURE-PLUS to handle the case where a drop from one node succeeds, but a drop from another node fails. In that case the entire cluster drop has failed. Note that SUCCESS-PLUS is returned when dropping from a proxied remote that is not a cluster, when the protocol version supports it. This is because P2P.Proxy does not know when it's proxying for a single node cluster vs for a remote that is not a cluster.
123 lines
3.9 KiB
Haskell
123 lines
3.9 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010-2023 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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module Command.Get where
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import Command
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import qualified Remote
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import Annex.Transfer
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import Annex.NumCopies
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import Annex.Wanted
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import qualified Command.Move
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import Logs.Location
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cmd :: Command
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cmd = withAnnexOptions [jobsOption, jsonOptions, jsonProgressOption, annexedMatchingOptions] $
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command "get" SectionCommon
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"make content of annexed files available"
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paramPaths (seek <$$> optParser)
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data GetOptions = GetOptions
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{ getFiles :: CmdParams
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, getFrom :: Maybe (DeferredParse Remote)
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, autoMode :: Bool
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, keyOptions :: Maybe KeyOptions
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, batchOption :: BatchMode
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}
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optParser :: CmdParamsDesc -> Parser GetOptions
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optParser desc = GetOptions
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<$> cmdParams desc
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<*> optional (mkParseRemoteOption <$> parseFromOption)
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<*> parseAutoOption
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<*> optional (parseIncompleteOption <|> parseKeyOptions <|> parseFailedTransfersOption)
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<*> parseBatchOption True
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seek :: GetOptions -> CommandSeek
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seek o = startConcurrency transferStages $ do
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from <- maybe (pure Nothing) (Just <$$> getParsed) (getFrom o)
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let seeker = AnnexedFileSeeker
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{ startAction = const $ start o from
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, checkContentPresent = Just False
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, usesLocationLog = True
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}
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case batchOption o of
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NoBatch -> withKeyOptions (keyOptions o) (autoMode o) seeker
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(commandAction . startKeys from)
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(withFilesInGitAnnex ww seeker)
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=<< workTreeItems ww (getFiles o)
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Batch fmt -> batchOnly (keyOptions o) (getFiles o) $
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batchAnnexed fmt seeker (startKeys from)
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where
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ww = WarnUnmatchLsFiles "get"
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start :: GetOptions -> Maybe Remote -> SeekInput -> RawFilePath -> Key -> CommandStart
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start o from si file key = start' expensivecheck from key afile ai si
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where
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afile = AssociatedFile (Just file)
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ai = mkActionItem (key, afile)
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expensivecheck
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| autoMode o = numCopiesCheck file key (<)
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<||> wantGet False (Just key) afile
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| otherwise = return True
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startKeys :: Maybe Remote -> (SeekInput, Key, ActionItem) -> CommandStart
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startKeys from (si, key, ai) = checkFailedTransferDirection ai Download $
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start' (return True) from key (AssociatedFile Nothing) ai si
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start' :: Annex Bool -> Maybe Remote -> Key -> AssociatedFile -> ActionItem -> SeekInput -> CommandStart
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start' expensivecheck from key afile ai si =
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stopUnless expensivecheck $
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case from of
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Nothing -> go $ perform key afile
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Just src ->
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stopUnless (Command.Move.fromOk src key) $
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go $ Command.Move.fromPerform src Command.Move.RemoveNever key afile
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where
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go = starting "get" (OnlyActionOn key ai) si
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perform :: Key -> AssociatedFile -> CommandPerform
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perform key afile = stopUnless (getKey key afile) $
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next $ return True -- no cleanup needed
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{- Try to find a copy of the file in one of the remotes,
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- and copy it to here. -}
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getKey :: Key -> AssociatedFile -> Annex Bool
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getKey key afile = getKey' key afile
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=<< Remote.keyPossibilities (Remote.IncludeIgnored False) key
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getKey' :: Key -> AssociatedFile -> [Remote] -> Annex Bool
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getKey' key afile = dispatch
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where
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dispatch [] = do
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showNote (UnquotedString "not available")
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showlocs []
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return False
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dispatch remotes = notifyTransfer Download afile $ \witness -> do
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ok <- pickRemote remotes $ \r -> ifM (probablyPresent r)
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( docopy r witness
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, return False
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)
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if ok
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then return ok
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else do
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Remote.showTriedRemotes remotes
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showlocs (map Remote.uuid remotes)
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return False
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showlocs exclude = Remote.showLocations False key
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(\u -> pure (u `elem` exclude))
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"No other repository is known to contain the file."
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-- This check is to avoid an ugly message if a remote is a
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-- drive that is not mounted.
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probablyPresent r
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| Remote.hasKeyCheap r =
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either (const False) id <$> Remote.hasKey r key
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| otherwise = return True
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docopy r witness = do
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showAction $ UnquotedString $ "from " ++ Remote.name r
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logStatusAfter key $
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download r key afile stdRetry witness
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