70 lines
2 KiB
Haskell
70 lines
2 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010 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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module Command.Get where
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import Common.Annex
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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 qualified Command.Move
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def :: [Command]
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def = [withOptions [Command.Move.fromOption] $ command "get" paramPaths seek
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"make content of annexed files available"]
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seek :: [CommandSeek]
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seek = [withField Command.Move.fromOption Remote.byName $ \from ->
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withFilesInGit $ whenAnnexed $ start from]
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start :: Maybe Remote -> FilePath -> (Key, Backend) -> CommandStart
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start from file (key, _) = stopUnless (not <$> inAnnex key) $
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autoCopies file key (<) $ \_numcopies ->
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case from of
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Nothing -> go $ perform key
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Just src -> do
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-- get --from = copy --from
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stopUnless (Command.Move.fromOk src key) $
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go $ Command.Move.fromPerform src False key
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where
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go a = do
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showStart "get" file
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next a
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perform :: Key -> CommandPerform
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perform key = stopUnless (getViaTmp key $ getKeyFile key) $
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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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getKeyFile :: Key -> FilePath -> Annex Bool
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getKeyFile key file = dispatch =<< Remote.keyPossibilities key
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where
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dispatch [] = do
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showNote "not available"
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Remote.showLocations key []
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return False
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dispatch remotes = trycopy remotes remotes
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trycopy full [] = do
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Remote.showTriedRemotes full
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Remote.showLocations key []
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return False
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trycopy full (r:rs) =
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ifM (probablyPresent r)
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( docopy r (trycopy full rs)
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, trycopy full rs
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)
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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 continue = do
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showAction $ "from " ++ Remote.name r
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ifM (Remote.retrieveKeyFile r key file)
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( return True , continue)
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