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{- git-annex command
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Migrate where
import Common.Annex
import Command
import qualified Backend
import qualified Types.Key
import Annex.Content
import qualified Command.ReKey
def :: [Command]
def = [command "migrate" paramPaths seek "switch data to different backend"]
seek :: [CommandSeek]
seek = [withFilesInGit $ whenAnnexed start]
start :: FilePath -> (Key, Backend) -> CommandStart
start file (key, oldbackend) = do
exists <- inAnnex key
newbackend <- choosebackend =<< Backend.chooseBackend file
if (newbackend /= oldbackend || upgradableKey key) && exists
then do
showStart "migrate" file
next $ perform file key newbackend
else stop
where
choosebackend Nothing = Prelude.head <$> Backend.orderedList
choosebackend (Just backend) = return backend
{- Checks if a key is upgradable to a newer representation. -}
{- Ideally, all keys have file size metadata. Old keys may not. -}
upgradableKey :: Key -> Bool
upgradableKey key = isNothing $ Types.Key.keySize key
{- Store the old backend's key in the new backend
- The old backend's key is not dropped from it, because there may
- be other files still pointing at that key.
-
- Use the same filename as the file for the temp file name, to support
- backends that allow the filename to influence the keys they
- generate.
-}
perform :: FilePath -> Key -> Backend -> CommandPerform
perform file oldkey newbackend = maybe stop go =<< genkey
where
go newkey = stopUnless (Command.ReKey.linkKey oldkey newkey) $
next $ Command.ReKey.cleanup file oldkey newkey
genkey = do
src <- inRepo $ gitAnnexLocation oldkey
tmp <- fromRepo gitAnnexTmpDir
let tmpfile = tmp </> takeFileName file
cleantmp tmpfile
liftIO $ createLink src tmpfile
newkey <- liftM fst <$>
Backend.genKey tmpfile (Just newbackend)
cleantmp tmpfile
return newkey
cleantmp t = liftIO $ whenM (doesFileExist t) $ removeFile t
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