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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 Backend
import qualified Types.Key
import Types.Backend (canUpgradeKey, fastMigrate)
import Types.KeySource
import Annex.Content
import qualified Command.ReKey
import qualified Command.Fsck
cmd :: [Command]
cmd = [notDirect $
command "migrate" paramPaths seek
SectionUtility "switch data to different backend"]
seek :: CommandSeek
seek = withFilesInGit $ whenAnnexed start
start :: FilePath -> Key -> CommandStart
start file key = do
v <- Backend.getBackend file key
case v of
Nothing -> stop
Just oldbackend -> do
exists <- inAnnex key
newbackend <- choosebackend =<< chooseBackend file
if (newbackend /= oldbackend || upgradableKey oldbackend key) && exists
then do
showStart "migrate" file
next $ perform file key oldbackend newbackend
else stop
where
choosebackend Nothing = Prelude.head <$> orderedList
choosebackend (Just backend) = return backend
{- Checks if a key is upgradable to a newer representation.
-
- Reasons for migration:
- - Ideally, all keys have file size metadata. Old keys may not.
- - Something has changed in the backend, such as a bug fix.
-}
upgradableKey :: Backend -> Key -> Bool
upgradableKey backend key = isNothing (Types.Key.keySize key) || backendupgradable
where
backendupgradable = maybe False (\a -> a key) (canUpgradeKey backend)
{- 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.
-
- To ensure that the data we have for the old key is valid, it's
- fscked here. First we generate the new key. This ensures that the
- data cannot get corrupted after the fsck but before the new key is
- generated.
-}
perform :: FilePath -> Key -> Backend -> Backend -> CommandPerform
perform file oldkey oldbackend newbackend = go =<< genkey
where
go Nothing = stop
go (Just (newkey, knowngoodcontent))
| knowngoodcontent = finish newkey
| otherwise = stopUnless checkcontent $ finish newkey
checkcontent = Command.Fsck.checkBackend oldbackend oldkey $ Just file
finish newkey = stopUnless (Command.ReKey.linkKey oldkey newkey) $
next $ Command.ReKey.cleanup file oldkey newkey
genkey = case maybe Nothing (\fm -> fm oldkey newbackend) (fastMigrate oldbackend) of
Just newkey -> return $ Just (newkey, True)
Nothing -> do
content <- calcRepo $ gitAnnexLocation oldkey
let source = KeySource
{ keyFilename = file
, contentLocation = content
, inodeCache = Nothing
}
v <- genKey source (Just newbackend)
return $ case v of
Just (newkey, _) -> Just (newkey, False)
_ -> Nothing
|
