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|
{- git-annex command
-
- Copyright 2010 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Drop where
import Common.Annex
import Command
import qualified Remote
import qualified Annex
import Annex.UUID
import Logs.Location
import Logs.Trust
import Logs.PreferredContent
import Annex.NumCopies
import Annex.Content
import Annex.Wanted
import Annex.Notification
import qualified Data.Set as S
cmd :: [Command]
cmd = [withOptions (dropOptions) $ command "drop" paramPaths seek
SectionCommon "indicate content of files not currently wanted"]
dropOptions :: [Option]
dropOptions = dropFromOption : annexedMatchingOptions ++ [autoOption] ++ keyOptions
dropFromOption :: Option
dropFromOption = fieldOption ['f'] "from" paramRemote "drop content from a remote"
seek :: CommandSeek
seek ps = do
from <- getOptionField dropFromOption Remote.byNameWithUUID
auto <- getOptionFlag autoOption
withKeyOptions auto
(startKeys auto from)
(withFilesInGit $ whenAnnexed $ start auto from)
ps
start :: Bool -> Maybe Remote -> FilePath -> Key -> CommandStart
start auto from file key = start' auto from key (Just file)
start' :: Bool -> Maybe Remote -> Key -> AssociatedFile -> CommandStart
start' auto from key afile = checkDropAuto auto from afile key $ \numcopies ->
stopUnless want $
case from of
Nothing -> startLocal afile numcopies key Nothing
Just remote -> do
u <- getUUID
if Remote.uuid remote == u
then startLocal afile numcopies key Nothing
else startRemote afile numcopies key remote
where
want
| auto = wantDrop False (Remote.uuid <$> from) (Just key) afile
| otherwise = return True
startKeys :: Bool -> Maybe Remote -> Key -> CommandStart
startKeys auto from key = start' auto from key Nothing
startLocal :: AssociatedFile -> NumCopies -> Key -> Maybe Remote -> CommandStart
startLocal afile numcopies key knownpresentremote = stopUnless (inAnnex key) $ do
showStart' "drop" key afile
next $ performLocal key afile numcopies knownpresentremote
startRemote :: AssociatedFile -> NumCopies -> Key -> Remote -> CommandStart
startRemote afile numcopies key remote = do
showStart' ("drop " ++ Remote.name remote) key afile
next $ performRemote key afile numcopies remote
-- Note that lockContent is called before checking if the key is present
-- on enough remotes to allow removal. This avoids a scenario where two
-- or more remotes are trying to remove a key at the same time, and each
-- see the key is present on the other.
performLocal :: Key -> AssociatedFile -> NumCopies -> Maybe Remote -> CommandPerform
performLocal key afile numcopies knownpresentremote = lockContent key $ \contentlock -> do
(remotes, trusteduuids) <- Remote.keyPossibilitiesTrusted key
let trusteduuids' = case knownpresentremote of
Nothing -> trusteduuids
Just r -> Remote.uuid r:trusteduuids
untrusteduuids <- trustGet UnTrusted
let tocheck = Remote.remotesWithoutUUID remotes (trusteduuids'++untrusteduuids)
u <- getUUID
ifM (canDrop u key afile numcopies trusteduuids' tocheck [])
( do
removeAnnex contentlock
notifyDrop afile True
next $ cleanupLocal key
, do
notifyDrop afile False
stop
)
performRemote :: Key -> AssociatedFile -> NumCopies -> Remote -> CommandPerform
performRemote key afile numcopies remote = do
-- Filter the remote it's being dropped from out of the lists of
-- places assumed to have the key, and places to check.
-- When the local repo has the key, that's one additional copy,
-- as long as the local repo is not untrusted.
(remotes, trusteduuids) <- knownCopies key
let have = filter (/= uuid) trusteduuids
untrusteduuids <- trustGet UnTrusted
let tocheck = filter (/= remote) $
Remote.remotesWithoutUUID remotes (have++untrusteduuids)
stopUnless (canDrop uuid key afile numcopies have tocheck [uuid]) $ do
ok <- Remote.removeKey remote key
next $ cleanupRemote key remote ok
where
uuid = Remote.uuid remote
cleanupLocal :: Key -> CommandCleanup
cleanupLocal key = do
logStatus key InfoMissing
return True
cleanupRemote :: Key -> Remote -> Bool -> CommandCleanup
cleanupRemote key remote ok = do
when ok $
Remote.logStatus remote key InfoMissing
return ok
{- Checks specified remotes to verify that enough copies of a key exist to
- allow it to be safely removed (with no data loss). Can be provided with
- some locations where the key is known/assumed to be present.
-
- Also checks if it's required content, and refuses to drop if so.
-
- --force overrides and always allows dropping.
-}
canDrop :: UUID -> Key -> AssociatedFile -> NumCopies -> [UUID] -> [Remote] -> [UUID] -> Annex Bool
canDrop dropfrom key afile numcopies have check skip =
ifM (Annex.getState Annex.force)
( return True
, ifM (checkRequiredContent dropfrom key afile
<&&> verifyEnoughCopies nolocmsg key numcopies skip have check
)
( return True
, do
hint
return False
)
)
where
nolocmsg = "Rather than dropping this file, try using: git annex move"
hint = showLongNote "(Use --force to override this check, or adjust numcopies.)"
checkRequiredContent :: UUID -> Key -> AssociatedFile -> Annex Bool
checkRequiredContent u k afile =
ifM (isRequiredContent (Just u) S.empty (Just k) afile False)
( requiredContent
, return True
)
requiredContent :: Annex Bool
requiredContent = do
showLongNote "That file is required content, it cannot be dropped!"
showLongNote "(Use --force to override this check, or adjust required content configuration.)"
return False
{- In auto mode, only runs the action if there are enough
- copies on other semitrusted repositories. -}
checkDropAuto :: Bool -> Maybe Remote -> AssociatedFile -> Key -> (NumCopies -> CommandStart) -> CommandStart
checkDropAuto auto mremote afile key a = go =<< maybe getNumCopies getFileNumCopies afile
where
go numcopies
| auto = do
locs <- Remote.keyLocations key
uuid <- getUUID
let remoteuuid = fromMaybe uuid $ Remote.uuid <$> mremote
locs' <- trustExclude UnTrusted $ filter (/= remoteuuid) locs
if NumCopies (length locs') >= numcopies
then a numcopies
else stop
| otherwise = a numcopies
|
