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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.Move where
import Command
import qualified Command.Drop
import qualified Annex
import LocationLog
import Types
import Content
import qualified Remote
import UUID
import Messages
command :: [Command]
command = [repoCommand "move" paramPath seek
"move content of files to/from another repository"]
seek :: [CommandSeek]
seek = [withFilesInGit $ start True]
{- Move (or copy) a file either --to or --from a repository.
-
- This only operates on the cached file content; it does not involve
- moving data in the key-value backend. -}
start :: Bool -> CommandStartString
start move file = do
to <- Annex.getState Annex.toremote
from <- Annex.getState Annex.fromremote
case (from, to) of
(Nothing, Nothing) -> error "specify either --from or --to"
(Nothing, Just name) -> do
dest <- Remote.byName name
toStart dest move file
(Just name, Nothing) -> do
src <- Remote.byName name
fromStart src move file
(_ , _) -> error "only one of --from or --to can be specified"
showAction :: Bool -> FilePath -> Annex ()
showAction True file = showStart "move" file
showAction False file = showStart "copy" file
{- Used to log a change in a remote's having a key. The change is logged
- in the local repo, not on the remote. The process of transferring the
- key to the remote, or removing the key from it *may* log the change
- on the remote, but this cannot be relied on. For example, it's not done
- for bare repos. -}
remoteHasKey :: Remote.Remote Annex -> Key -> Bool -> Annex ()
remoteHasKey remote key present = do
let remoteuuid = Remote.uuid remote
logStatusFor remoteuuid key status
where
status = if present then ValuePresent else ValueMissing
{- Moves (or copies) the content of an annexed file to a remote.
-
- If the remote already has the content, it is still removed from
- the current repository.
-
- Note that unlike drop, this does not honor annex.numcopies.
- A file's content can be moved even if there are insufficient copies to
- allow it to be dropped.
-}
toStart :: Remote.Remote Annex -> Bool -> CommandStartString
toStart dest move file = isAnnexed file $ \(key, _) -> do
g <- Annex.gitRepo
u <- getUUID g
ishere <- inAnnex key
if not ishere || u == Remote.uuid dest
then return Nothing -- not here, so nothing to do
else do
showAction move file
return $ Just $ toPerform dest move key
toPerform :: Remote.Remote Annex -> Bool -> Key -> CommandPerform
toPerform dest move key = do
-- Checking the remote is expensive, so not done in the start step.
-- In fast mode, location tracking is assumed to be correct,
-- and an explicit check is not done, when copying. When moving,
-- it has to be done, to avoid inaverdent data loss.
fast <- Annex.getState Annex.fast
isthere <- if fast && not move && not (Remote.hasKeyCheap dest)
then do
(remotes, _) <- Remote.keyPossibilities key
return $ Right $ dest `elem` remotes
else Remote.hasKey dest key
case isthere of
Left err -> do
showNote $ show err
return Nothing
Right False -> do
showNote $ "to " ++ Remote.name dest ++ "..."
ok <- Remote.storeKey dest key
if ok
then return $ Just $ toCleanup dest move key
else return Nothing -- failed
Right True -> return $ Just $ toCleanup dest move key
toCleanup :: Remote.Remote Annex -> Bool -> Key -> CommandCleanup
toCleanup dest move key = do
remoteHasKey dest key True
if move
then Command.Drop.cleanup key
else return True
{- Moves (or copies) the content of an annexed file from a remote
- to the current repository.
-
- If the current repository already has the content, it is still removed
- from the remote.
-}
fromStart :: Remote.Remote Annex -> Bool -> CommandStartString
fromStart src move file = isAnnexed file $ \(key, _) -> do
g <- Annex.gitRepo
u <- getUUID g
(remotes, _) <- Remote.keyPossibilities key
if (u == Remote.uuid src) || (null $ filter (== src) remotes)
then return Nothing
else do
showAction move file
return $ Just $ fromPerform src move key
fromPerform :: Remote.Remote Annex -> Bool -> Key -> CommandPerform
fromPerform src move key = do
ishere <- inAnnex key
if ishere
then return $ Just $ fromCleanup src move key
else do
showNote $ "from " ++ Remote.name src ++ "..."
ok <- getViaTmp key $ Remote.retrieveKeyFile src key
if ok
then return $ Just $ fromCleanup src move key
else return Nothing -- fail
fromCleanup :: Remote.Remote Annex -> Bool -> Key -> CommandCleanup
fromCleanup src True key = do
ok <- Remote.removeKey src key
-- better safe than sorry: assume the src dropped the key
-- even if it seemed to fail; the failure could have occurred
-- after it really dropped it
remoteHasKey src key False
return ok
fromCleanup _ False _ = return True
|
