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|
{- dropping of unwanted content
-
- Copyright 2012-2014 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.Drop where
import Common.Annex
import Logs.Trust
import Types.Remote (uuid)
import qualified Remote
import qualified Command.Drop
import Command
import Annex.Wanted
import Annex.Exception
import Config
import Annex.Content.Direct
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 tried first.
-
- A remote can be specified that is known to have the key. This can be
- used an 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 -> Maybe Remote -> CommandActionRunner -> Annex ()
handleDropsFrom _ _ _ _ _ Nothing _ _ = noop
handleDropsFrom locs rs reason fromhere key (Just afile) knownpresentremote runner = do
fs <- ifM isDirect
( do
l <- associatedFilesRelative key
if null l
then return [afile]
else return l
, return [afile]
)
n <- getcopies fs
if fromhere && checkcopies n Nothing
then go fs rs =<< dropl fs n
else go fs rs n
where
getcopies fs = do
(untrusted, have) <- trustPartition UnTrusted locs
numcopies <- maximum <$> mapM (getNumCopies <=< numCopies) fs
return (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 =
(have - 1, numcopies, untrusted)
decrcopies v@(_have, _numcopies, untrusted) (Just u)
| S.member u untrusted = v
| otherwise = decrcopies v Nothing
go _ [] _ = noop
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 = noop
checkdrop fs n@(have, numcopies, _untrusted) u a =
ifM (allM (wantDrop True u . Just) fs)
( ifM (safely $ runner $ a (Just numcopies))
( do
liftIO $ debugM "drop" $ unwords
[ "dropped"
, afile
, "(from " ++ maybe "here" show u ++ ")"
, "(copies now " ++ show (have - 1) ++ ")"
, ": " ++ reason
]
return $ decrcopies n u
, return n
)
, return n
)
dropl fs n = checkdrop fs n Nothing $ \numcopies ->
Command.Drop.startLocal (Just afile) numcopies key knownpresentremote
dropr fs r n = checkdrop fs n (Just $ Remote.uuid r) $ \numcopies ->
Command.Drop.startRemote (Just afile) numcopies key r
slocs = S.fromList locs
safely a = either (const False) id <$> tryAnnex a
|
