125 lines
3.8 KiB
Haskell
125 lines
3.8 KiB
Haskell
{- dropping of unwanted content
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-
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- Copyright 2012-2014 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 Annex.Drop where
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import Common.Annex
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import Logs.Trust
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import Annex.NumCopies
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import Types.Remote (uuid)
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import Types.Key (key2file)
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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 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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-
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- If allowed to drop fromhere, that drop will be done last. This is done
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- because local drops do not need any LockedCopy evidence, and so dropping
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- from local last allows the content to be removed from more remotes.
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-
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- A VerifiedCopy can be provided as an optimisation when eg, a key
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- has just been uploaded to a 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 -> [VerifiedCopy] -> (CommandStart -> CommandCleanup) -> Annex ()
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handleDropsFrom locs rs reason fromhere key afile preverified 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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return $ if null l
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then maybeToList afile
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else l
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, return $ maybeToList afile
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)
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n <- getcopies fs
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void $ if fromhere && checkcopies n Nothing
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then go fs rs n >>= dropl fs
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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 <- if null fs
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then getNumCopies
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else 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 _ [] n = pure n
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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 = pure n
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checkdrop fs n u a
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| null fs = check $ -- no associated files; unused content
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wantDrop True u (Just key) Nothing
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| otherwise = check $
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allM (wantDrop True u (Just key) . Just) fs
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where
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check c = ifM c
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( dodrop n u a
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, return n
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)
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dodrop n@(have, numcopies, _untrusted) u a =
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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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, fromMaybe (key2file key) 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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dropl fs n = checkdrop fs n Nothing $ \numcopies ->
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Command.Drop.startLocal afile numcopies key preverified
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dropr fs r n = checkdrop fs n (Just $ Remote.uuid r) $ \numcopies ->
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Command.Drop.startRemote afile numcopies key r
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slocs = S.fromList locs
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safely a = either (const False) id <$> tryNonAsync a
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