114 lines
3.5 KiB
Haskell
114 lines
3.5 KiB
Haskell
{- dropping of unwanted content
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-
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- Copyright 2012-2014 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 Annex.Drop where
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import Common.Annex
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import Logs.Trust
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import Config.NumCopies
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import Types.Remote (uuid)
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import qualified Remote
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import qualified Command.Drop
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import Command
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import Annex.Wanted
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import Annex.Exception
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import Config
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import Annex.Content.Direct
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import qualified Data.Set as S
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import System.Log.Logger (debugM)
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type Reason = String
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{- Drop a key from local and/or remote when allowed by the preferred content
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- and numcopies settings.
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-
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- The UUIDs are ones where the content is believed to be present.
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- The Remote list can include other remotes that do not have the content;
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- only ones that match the UUIDs will be dropped from.
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- If allowed to drop fromhere, that drop will be tried first.
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-
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- A remote can be specified that is known to have the key. This can be
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- used an an optimisation when eg, a key has just been uploaded to a
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- remote.
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-
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- In direct mode, all associated files are checked, and only if all
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- of them are unwanted are they dropped.
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-
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- The runner is used to run commands, and so can be either callCommand
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- or commandAction.
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-}
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handleDropsFrom :: [UUID] -> [Remote] -> Reason -> Bool -> Key -> AssociatedFile -> Maybe Remote -> CommandActionRunner -> Annex ()
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handleDropsFrom _ _ _ _ _ Nothing _ _ = noop
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handleDropsFrom locs rs reason fromhere key (Just afile) knownpresentremote runner = do
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fs <- ifM isDirect
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( do
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l <- associatedFilesRelative key
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if null l
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then return [afile]
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else return l
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, return [afile]
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)
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n <- getcopies fs
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if fromhere && checkcopies n Nothing
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then go fs rs =<< dropl fs n
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else go fs rs n
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where
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getcopies fs = do
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(untrusted, have) <- trustPartition UnTrusted locs
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numcopies <- maximum <$> mapM getFileNumCopies fs
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return (NumCopies (length have), numcopies, S.fromList untrusted)
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{- Check that we have enough copies still to drop the content.
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- When the remote being dropped from is untrusted, it was not
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- counted as a copy, so having only numcopies suffices. Otherwise,
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- we need more than numcopies to safely drop. -}
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checkcopies (have, numcopies, _untrusted) Nothing = have > numcopies
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checkcopies (have, numcopies, untrusted) (Just u)
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| S.member u untrusted = have >= numcopies
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| otherwise = have > numcopies
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decrcopies (have, numcopies, untrusted) Nothing =
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(NumCopies (fromNumCopies have - 1), numcopies, untrusted)
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decrcopies v@(_have, _numcopies, untrusted) (Just u)
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| S.member u untrusted = v
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| otherwise = decrcopies v Nothing
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go _ [] _ = noop
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go fs (r:rest) n
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| uuid r `S.notMember` slocs = go fs rest n
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| checkcopies n (Just $ Remote.uuid r) =
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dropr fs r n >>= go fs rest
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| otherwise = noop
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checkdrop fs n@(have, numcopies, _untrusted) u a =
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ifM (allM (wantDrop True u . Just) fs)
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( ifM (safely $ runner $ a numcopies)
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( do
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liftIO $ debugM "drop" $ unwords
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[ "dropped"
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, afile
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, "(from " ++ maybe "here" show u ++ ")"
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, "(copies now " ++ show (fromNumCopies have - 1) ++ ")"
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, ": " ++ reason
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]
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return $ decrcopies n u
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, return n
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)
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, return n
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)
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dropl fs n = checkdrop fs n Nothing $ \numcopies ->
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Command.Drop.startLocal (Just afile) numcopies key knownpresentremote
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dropr fs r n = checkdrop fs n (Just $ Remote.uuid r) $ \numcopies ->
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Command.Drop.startRemote (Just afile) numcopies key r
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slocs = S.fromList locs
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safely a = either (const False) id <$> tryAnnex a
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