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|
{- git-annex assistant dropping of unwanted content
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Drop where
import Assistant.Common
import Assistant.DaemonStatus
import Logs.Location
import Logs.Trust
import Types.Remote (AssociatedFile)
import qualified Remote
import qualified Command.Drop
import Command
import Annex.Wanted
import Annex.Exception
import Config
{- Drop from local and/or remote when allowed by the preferred content and
- numcopies settings. If it's known to be present on a particular remote,
- -}
handleDrops :: Bool -> Key -> AssociatedFile -> Maybe Remote -> Assistant ()
handleDrops _ _ Nothing _ = noop
handleDrops fromhere key f knownpresentremote = do
syncrs <- syncDataRemotes <$> getDaemonStatus
liftAnnex $ do
locs <- loggedLocations key
handleDropsFrom locs syncrs fromhere key f knownpresentremote
handleDropsFrom :: [UUID] -> [Remote] -> Bool -> Key -> AssociatedFile -> Maybe Remote -> Annex ()
handleDropsFrom _ _ _ _ Nothing _ = noop
handleDropsFrom locs rs fromhere key (Just f) knownpresentremote
| fromhere = do
n <- getcopies
if checkcopies n
then go rs =<< dropl n
else go rs n
| otherwise = go rs =<< getcopies
where
getcopies = do
have <- length <$> trustExclude UnTrusted locs
numcopies <- getNumCopies =<< numCopies f
return (have, numcopies)
checkcopies (have, numcopies) = have > numcopies
decrcopies (have, numcopies) = (have - 1, numcopies)
go [] _ = noop
go (r:rest) n
| checkcopies n = dropr r n >>= go rest
| otherwise = noop
checkdrop n@(_, numcopies) u a = ifM (wantDrop u (Just f))
( ifM (safely $ doCommand $ a (Just numcopies))
( return $ decrcopies n
, return n
)
, return n
)
dropl n = checkdrop n Nothing $ \numcopies ->
Command.Drop.startLocal f numcopies key knownpresentremote
dropr r n = checkdrop n (Just $ Remote.uuid r) $ \numcopies ->
Command.Drop.startRemote f numcopies key r
safely a = either (const False) id <$> tryAnnex a
|
