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|
{- git-annex command
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- 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 Config.NumCopies
import Annex.Content
import Annex.Wanted
def :: [Command]
def = [withOptions [dropFromOption] $ command "drop" paramPaths seek
SectionCommon "indicate content of files not currently wanted"]
dropFromOption :: Option
dropFromOption = fieldOption ['f'] "from" paramRemote "drop content from a remote"
seek :: CommandSeek
seek ps = do
from <- getOptionField dropFromOption Remote.byNameWithUUID
withFilesInGit (whenAnnexed $ start from) ps
start :: Maybe Remote -> FilePath -> (Key, Backend) -> CommandStart
start from file (key, _) = checkDropAuto from file key $ \numcopies ->
stopUnless (checkAuto $ wantDrop False (Remote.uuid <$> from) (Just key) (Just file)) $
case from of
Nothing -> startLocal (Just file) numcopies key Nothing
Just remote -> do
u <- getUUID
if Remote.uuid remote == u
then startLocal (Just file) numcopies key Nothing
else startRemote (Just file) numcopies key remote
startLocal :: AssociatedFile -> NumCopies -> Key -> Maybe Remote -> CommandStart
startLocal afile numcopies key knownpresentremote = stopUnless (inAnnex key) $ do
showStart' "drop" key afile
next $ performLocal key numcopies knownpresentremote
startRemote :: AssociatedFile -> NumCopies -> Key -> Remote -> CommandStart
startRemote afile numcopies key remote = do
showStart' ("drop " ++ Remote.name remote) key afile
next $ performRemote key numcopies remote
performLocal :: Key -> NumCopies -> Maybe Remote -> CommandPerform
performLocal key numcopies knownpresentremote = lockContent key $ do
(remotes, trusteduuids) <- Remote.keyPossibilitiesTrusted key
let trusteduuids' = case knownpresentremote of
Nothing -> trusteduuids
Just r -> nub (Remote.uuid r:trusteduuids)
untrusteduuids <- trustGet UnTrusted
let tocheck = Remote.remotesWithoutUUID remotes (trusteduuids'++untrusteduuids)
stopUnless (canDropKey key numcopies trusteduuids' tocheck []) $ do
removeAnnex key
next $ cleanupLocal key
performRemote :: Key -> NumCopies -> Remote -> CommandPerform
performRemote key numcopies remote = lockContent key $ 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.
(remotes, trusteduuids) <- Remote.keyPossibilitiesTrusted key
present <- inAnnex key
u <- getUUID
let have = filter (/= uuid) $
if present then u:trusteduuids else trusteduuids
untrusteduuids <- trustGet UnTrusted
let tocheck = filter (/= remote) $
Remote.remotesWithoutUUID remotes (have++untrusteduuids)
stopUnless (canDropKey key 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. -}
canDropKey :: Key -> NumCopies -> [UUID] -> [Remote] -> [UUID] -> Annex Bool
canDropKey key numcopies have check skip = do
force <- Annex.getState Annex.force
if force || numcopies == NumCopies 0
then return True
else findCopies key numcopies skip have check
findCopies :: Key -> NumCopies -> [UUID] -> [UUID] -> [Remote] -> Annex Bool
findCopies key need skip = helper [] []
where
helper bad missing have []
| NumCopies (length have) >= need = return True
| otherwise = notEnoughCopies key need have (skip++missing) bad
helper bad missing have (r:rs)
| NumCopies (length have) >= need = return True
| otherwise = do
let u = Remote.uuid r
let duplicate = u `elem` have
haskey <- Remote.hasKey r key
case (duplicate, haskey) of
(False, Right True) -> helper bad missing (u:have) rs
(False, Left _) -> helper (r:bad) missing have rs
(False, Right False) -> helper bad (u:missing) have rs
_ -> helper bad missing have rs
notEnoughCopies :: Key -> NumCopies -> [UUID] -> [UUID] -> [Remote] -> Annex Bool
notEnoughCopies key need have skip bad = do
unsafe
showLongNote $
"Could only verify the existence of " ++
show (length have) ++ " out of " ++ show (fromNumCopies need) ++
" necessary copies"
Remote.showTriedRemotes bad
Remote.showLocations key (have++skip)
"Rather than dropping this file, try using: git annex move"
hint
return False
where
unsafe = showNote "unsafe"
hint = showLongNote "(Use --force to override this check, or adjust numcopies.)"
{- In auto mode, only runs the action if there are enough
- copies on other semitrusted repositories. -}
checkDropAuto :: Maybe Remote -> FilePath -> Key -> (NumCopies -> CommandStart) -> CommandStart
checkDropAuto mremote file key a = do
numcopies <- getFileNumCopies file
Annex.getState Annex.auto >>= auto numcopies
where
auto numcopies False = a numcopies
auto numcopies True = 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
|
