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|
{- git-annex command
-
- Copyright 2010, 2013 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Get where
import Common.Annex
import Command
import qualified Remote
import Annex.Content
import Annex.Transfer
import Annex.NumCopies
import Annex.Wanted
import qualified Command.Move
cmd :: Command
cmd = withGlobalOptions (jobsOption : annexedMatchingOptions) $
command "get" SectionCommon
"make content of annexed files available"
paramPaths (seek <$$> optParser)
data GetOptions = GetOptions
{ getFiles :: CmdParams
, getFrom :: Maybe (DeferredParse Remote)
, autoMode :: Bool
, keyOptions :: Maybe KeyOptions
}
optParser :: CmdParamsDesc -> Parser GetOptions
optParser desc = GetOptions
<$> cmdParams desc
<*> optional parseFromOption
<*> parseAutoOption
<*> optional (parseKeyOptions True)
seek :: GetOptions -> CommandSeek
seek o = do
from <- maybe (pure Nothing) (Just <$$> getParsed) (getFrom o)
withKeyOptions (keyOptions o) (autoMode o)
(startKeys from)
(withFilesInGit $ whenAnnexed $ start o from)
(getFiles o)
start :: GetOptions -> Maybe Remote -> FilePath -> Key -> CommandStart
start o from file key = start' expensivecheck from key (Just file)
where
expensivecheck
| autoMode o = numCopiesCheck file key (<) <||> wantGet False (Just key) (Just file)
| otherwise = return True
startKeys :: Maybe Remote -> Key -> CommandStart
startKeys from key = start' (return True) from key Nothing
start' :: Annex Bool -> Maybe Remote -> Key -> AssociatedFile -> CommandStart
start' expensivecheck from key afile = stopUnless (not <$> inAnnex key) $
stopUnless expensivecheck $
case from of
Nothing -> go $ perform key afile
Just src ->
stopUnless (Command.Move.fromOk src key) $
go $ Command.Move.fromPerform src False key afile
where
go a = do
showStart' "get" key afile
next a
perform :: Key -> AssociatedFile -> CommandPerform
perform key afile = stopUnless (getKey key afile) $
next $ return True -- no cleanup needed
{- Try to find a copy of the file in one of the remotes,
- and copy it to here. -}
getKey :: Key -> AssociatedFile -> Annex Bool
getKey key afile = getKey' key afile =<< Remote.keyPossibilities key
getKey' :: Key -> AssociatedFile -> [Remote] -> Annex Bool
getKey' key afile = dispatch
where
dispatch [] = do
showNote "not available"
showlocs
return False
dispatch remotes = notifyTransfer Download afile $ trycopy remotes remotes
trycopy full [] _ = do
Remote.showTriedRemotes full
showlocs
return False
trycopy full (r:rs) witness =
ifM (probablyPresent r)
( docopy r witness <||> trycopy full rs witness
, trycopy full rs witness
)
showlocs = Remote.showLocations False key []
"No other repository is known to contain the file."
-- This check is to avoid an ugly message if a remote is a
-- drive that is not mounted.
probablyPresent r
| Remote.hasKeyCheap r =
either (const False) id <$> Remote.hasKey r key
| otherwise = return True
docopy r witness = getViaTmp (RemoteVerify r) key $ \dest ->
download (Remote.uuid r) key afile noRetry noObserver
(\p -> do
showAction $ "from " ++ Remote.name r
Remote.retrieveKeyFile r key afile dest p
) witness
|
