e1ac299ad0
This avoids all the complication about redundant work discussed in the previous try at fixing this. At the expense of needing each command that could have the problem to be patched to simply wrap the action in onlyActionOn once the key is known. But there do not seem to be many such commands. onlyActionOn' should not be used with a CommandStart (or CommandPerform), although the types do allow it. onlyActionOn handles running the whole CommandStart chain. I couldn't immediately see a way to avoid mistken use of onlyActionOn'. This commit was supported by the NSF-funded DataLad project.
117 lines
3.6 KiB
Haskell
117 lines
3.6 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010, 2013 Joey Hess <id@joeyh.name>
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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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module Command.Get where
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import Command
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import qualified Remote
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import Annex.Content
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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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cmd :: Command
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cmd = withGlobalOptions (jobsOption : jsonOption : 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 <$$> optParser)
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data GetOptions = GetOptions
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{ getFiles :: CmdParams
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, getFrom :: Maybe (DeferredParse Remote)
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, autoMode :: Bool
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, keyOptions :: Maybe KeyOptions
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, batchOption :: BatchMode
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}
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optParser :: CmdParamsDesc -> Parser GetOptions
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optParser desc = GetOptions
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<$> cmdParams desc
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<*> optional (parseRemoteOption <$> parseFromOption)
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<*> parseAutoOption
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<*> optional (parseIncompleteOption <|> parseKeyOptions <|> parseFailedTransfersOption)
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<*> parseBatchOption
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seek :: GetOptions -> CommandSeek
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seek o = allowConcurrentOutput $ do
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from <- maybe (pure Nothing) (Just <$$> getParsed) (getFrom o)
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let go = whenAnnexed $ start o from
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case batchOption o of
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Batch -> batchInput Right (batchCommandAction . go)
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NoBatch -> withKeyOptions (keyOptions o) (autoMode o)
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(startKeys from)
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(withFilesInGit go)
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=<< workTreeItems (getFiles o)
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start :: GetOptions -> Maybe Remote -> FilePath -> Key -> CommandStart
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start o from file key = start' expensivecheck from key afile (mkActionItem afile)
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where
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afile = AssociatedFile (Just file)
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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 -> Key -> ActionItem -> CommandStart
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startKeys from key ai = checkFailedTransferDirection ai Download $
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start' (return True) from key (AssociatedFile Nothing) ai
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start' :: Annex Bool -> Maybe Remote -> Key -> AssociatedFile -> ActionItem -> CommandStart
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start' expensivecheck from key afile ai = onlyActionOn key $
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stopUnless (not <$> inAnnex key) $ 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 False key afile
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where
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go a = do
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showStart' "get" key ai
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next a
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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 =<< Remote.keyPossibilities 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 "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
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return False
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showlocs = Remote.showLocations False key []
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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 = getViaTmp (RemoteVerify r) key $ \dest ->
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download (Remote.uuid r) key afile forwardRetry
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(\p -> do
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showAction $ "from " ++ Remote.name r
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Remote.retrieveKeyFile r key afile dest p
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) witness
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