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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 Annex.Content
import Config
import qualified Option
import Annex.Wanted
import Types.Key
def :: [Command]
def = [withOptions [fromOption] $ command "drop" paramPaths seek
SectionCommon "indicate content of files not currently wanted"]
fromOption :: Option
fromOption = Option.field ['f'] "from" paramRemote "drop content from a remote"
seek :: CommandSeek
seek ps = do
from <- getOptionField fromOption 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 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 -> Maybe Int -> Key -> Maybe Remote -> CommandStart
startLocal afile numcopies key knownpresentremote = stopUnless (inAnnex key) $ do
showStart "drop" (fromMaybe (key2file key) afile)
next $ performLocal key numcopies knownpresentremote
startRemote :: AssociatedFile -> Maybe Int -> Key -> Remote -> CommandStart
startRemote afile numcopies key remote = do
showStart ("drop " ++ Remote.name remote) (fromMaybe (key2file key) afile)
next $ performRemote key numcopies remote
performLocal :: Key -> Maybe Int -> 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 -> Maybe Int -> 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 -> Maybe Int -> [UUID] -> [Remote] -> [UUID] -> Annex Bool
canDropKey key numcopiesM have check skip = do
force <- Annex.getState Annex.force
if force || numcopiesM == Just 0
then return True
else do
need <- getNumCopies numcopiesM
findCopies key need skip have check
findCopies :: Key -> Int -> [UUID] -> [UUID] -> [Remote] -> Annex Bool
findCopies key need skip = helper [] []
where
helper bad missing have []
| length have >= need = return True
| otherwise = notEnoughCopies key need have (skip++missing) bad
helper bad missing have (r:rs)
| 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 -> Int -> [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 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 annex.numcopies.)"
{- In auto mode, only runs the action if there are enough
- copies on other semitrusted repositories.
-
- Passes any numcopies attribute of the file on to the action as an
- optimisation. -}
checkDropAuto :: Maybe Remote -> FilePath -> Key -> (Maybe Int -> CommandStart) -> CommandStart
checkDropAuto mremote file key a = do
numcopiesattr <- numCopies file
Annex.getState Annex.auto >>= auto numcopiesattr
where
auto numcopiesattr False = a numcopiesattr
auto numcopiesattr True = do
needed <- getNumCopies numcopiesattr
locs <- Remote.keyLocations key
uuid <- getUUID
let remoteuuid = fromMaybe uuid $ Remote.uuid <$> mremote
locs' <- trustExclude UnTrusted $ filter (/= remoteuuid) locs
if length locs' >= needed
then a numcopiesattr
else stop
|
