123 lines
3.8 KiB
Haskell
123 lines
3.8 KiB
Haskell
{- dropping of unwanted content
|
|
-
|
|
- Copyright 2012-2014 Joey Hess <id@joeyh.name>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Annex.Drop where
|
|
|
|
import Common.Annex
|
|
import Logs.Trust
|
|
import Annex.NumCopies
|
|
import Types.Remote (uuid)
|
|
import Types.Key (key2file)
|
|
import qualified Remote
|
|
import qualified Command.Drop
|
|
import Command
|
|
import Annex.Wanted
|
|
import Config
|
|
import Annex.Content.Direct
|
|
import qualified Database.Keys
|
|
|
|
import qualified Data.Set as S
|
|
import System.Log.Logger (debugM)
|
|
|
|
type Reason = String
|
|
|
|
{- Drop a key from local and/or remote when allowed by the preferred content
|
|
- and numcopies settings.
|
|
-
|
|
- The UUIDs are ones where the content is believed to be present.
|
|
- The Remote list can include other remotes that do not have the content;
|
|
- only ones that match the UUIDs will be dropped from.
|
|
-
|
|
- If allowed to drop fromhere, that drop will be done last. This is done
|
|
- because local drops do not need any LockedCopy evidence, and so dropping
|
|
- from local last allows the content to be removed from more remotes.
|
|
-
|
|
- A VerifiedCopy can be provided as an optimisation when eg, a key
|
|
- has just been uploaded to a remote.
|
|
-
|
|
- In direct mode, all associated files are checked, and only if all
|
|
- of them are unwanted are they dropped.
|
|
-
|
|
- The runner is used to run commands, and so can be either callCommand
|
|
- or commandAction.
|
|
-}
|
|
handleDropsFrom :: [UUID] -> [Remote] -> Reason -> Bool -> Key -> AssociatedFile -> [VerifiedCopy] -> (CommandStart -> CommandCleanup) -> Annex ()
|
|
handleDropsFrom locs rs reason fromhere key afile preverified runner = do
|
|
l <- ifM isDirect
|
|
( associatedFilesRelative key
|
|
, Database.Keys.getAssociatedFiles key
|
|
)
|
|
let fs = if null l then maybeToList afile else l
|
|
n <- getcopies fs
|
|
void $ if fromhere && checkcopies n Nothing
|
|
then go fs rs n >>= dropl fs
|
|
else go fs rs n
|
|
where
|
|
getcopies fs = do
|
|
(untrusted, have) <- trustPartition UnTrusted locs
|
|
numcopies <- if null fs
|
|
then getNumCopies
|
|
else maximum <$> mapM getFileNumCopies fs
|
|
return (NumCopies (length have), numcopies, S.fromList untrusted)
|
|
|
|
{- Check that we have enough copies still to drop the content.
|
|
- When the remote being dropped from is untrusted, it was not
|
|
- counted as a copy, so having only numcopies suffices. Otherwise,
|
|
- we need more than numcopies to safely drop. -}
|
|
checkcopies (have, numcopies, _untrusted) Nothing = have > numcopies
|
|
checkcopies (have, numcopies, untrusted) (Just u)
|
|
| S.member u untrusted = have >= numcopies
|
|
| otherwise = have > numcopies
|
|
|
|
decrcopies (have, numcopies, untrusted) Nothing =
|
|
(NumCopies (fromNumCopies have - 1), numcopies, untrusted)
|
|
decrcopies v@(_have, _numcopies, untrusted) (Just u)
|
|
| S.member u untrusted = v
|
|
| otherwise = decrcopies v Nothing
|
|
|
|
go _ [] n = pure n
|
|
go fs (r:rest) n
|
|
| uuid r `S.notMember` slocs = go fs rest n
|
|
| checkcopies n (Just $ Remote.uuid r) =
|
|
dropr fs r n >>= go fs rest
|
|
| otherwise = pure n
|
|
|
|
checkdrop fs n u a
|
|
| null fs = check $ -- no associated files; unused content
|
|
wantDrop True u (Just key) Nothing
|
|
| otherwise = check $
|
|
allM (wantDrop True u (Just key) . Just) fs
|
|
where
|
|
check c = ifM c
|
|
( dodrop n u a
|
|
, return n
|
|
)
|
|
|
|
dodrop n@(have, numcopies, _untrusted) u a =
|
|
ifM (safely $ runner $ a numcopies)
|
|
( do
|
|
liftIO $ debugM "drop" $ unwords
|
|
[ "dropped"
|
|
, fromMaybe (key2file key) afile
|
|
, "(from " ++ maybe "here" show u ++ ")"
|
|
, "(copies now " ++ show (fromNumCopies have - 1) ++ ")"
|
|
, ": " ++ reason
|
|
]
|
|
return $ decrcopies n u
|
|
, return n
|
|
)
|
|
|
|
dropl fs n = checkdrop fs n Nothing $ \numcopies ->
|
|
Command.Drop.startLocal afile numcopies key preverified
|
|
|
|
dropr fs r n = checkdrop fs n (Just $ Remote.uuid r) $ \numcopies ->
|
|
Command.Drop.startRemote afile numcopies key r
|
|
|
|
slocs = S.fromList locs
|
|
|
|
safely a = either (const False) id <$> tryNonAsync a
|
|
|