132 lines
4.4 KiB
Haskell
132 lines
4.4 KiB
Haskell
{- 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
|
|
|
|
def :: [Command]
|
|
def = [dontCheck fromOpt $ command "drop" paramPaths seek
|
|
"indicate content of files not currently wanted"]
|
|
|
|
seek :: [CommandSeek]
|
|
seek = [withNumCopies $ \n -> whenAnnexed $ start n]
|
|
|
|
start :: Maybe Int -> FilePath -> (Key, Backend) -> CommandStart
|
|
start numcopies file (key, _) = autoCopies key (>) numcopies $ do
|
|
from <- Annex.getState Annex.fromremote
|
|
case from of
|
|
Nothing -> startLocal file numcopies key
|
|
Just name -> do
|
|
remote <- Remote.byName name
|
|
u <- getUUID
|
|
if Remote.uuid remote == u
|
|
then startLocal file numcopies key
|
|
else startRemote file numcopies key remote
|
|
|
|
startLocal :: FilePath -> Maybe Int -> Key -> CommandStart
|
|
startLocal file numcopies key = stopUnless (inAnnex key) $ do
|
|
showStart "drop" file
|
|
next $ performLocal key numcopies
|
|
|
|
startRemote :: FilePath -> Maybe Int -> Key -> Remote -> CommandStart
|
|
startRemote file numcopies key remote = do
|
|
showStart "drop" file
|
|
next $ performRemote key numcopies remote
|
|
|
|
performLocal :: Key -> Maybe Int -> CommandPerform
|
|
performLocal key numcopies = lockContent key $ do
|
|
(remotes, trusteduuids) <- Remote.keyPossibilitiesTrusted key
|
|
untrusteduuids <- trustGet UnTrusted
|
|
let tocheck = Remote.remotesWithoutUUID remotes (trusteduuids++untrusteduuids)
|
|
stopUnless (canDropKey key numcopies trusteduuids tocheck []) $ do
|
|
whenM (inAnnex key) $ 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
|
|
-- better safe than sorry: assume the remote dropped the key
|
|
-- even if it seemed to fail; the failure could have occurred
|
|
-- after it really dropped it
|
|
Remote.logStatus remote key False
|
|
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 have []
|
|
| length have >= need = return True
|
|
| otherwise = notEnoughCopies key need have skip bad
|
|
helper bad 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 (u:have) rs
|
|
(False, Left _) -> helper (r:bad) have rs
|
|
_ -> helper bad 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)
|
|
hint
|
|
return False
|
|
where
|
|
unsafe = showNote "unsafe"
|
|
hint = showLongNote "(Use --force to override this check, or adjust annex.numcopies.)"
|