d5ee5fef65
In particular, when two files had the same content, and one was unlocked and modified, with annex.thin that can corrupt the content of the annex object, and so fsck on the other file should detect that. getKeyStatus was relying on Database.Keys.getAssociatedFiles to tell when a file is unlocked, but that can false positive because the database can list old associated files. Instead, separate out the case of unlocked object which has multiple hardlinks when annex.thin is in use.
99 lines
3.2 KiB
Haskell
99 lines
3.2 KiB
Haskell
{- git-annex command
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-
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- Copyright 2011 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Command.Migrate where
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import Command
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import Backend
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import Types.Backend (canUpgradeKey, fastMigrate)
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import Types.KeySource
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import Annex.Content
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import qualified Command.ReKey
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import qualified Command.Fsck
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import qualified Annex
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import Logs.MetaData
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import Logs.Web
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cmd :: Command
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cmd = notDirect $ withGlobalOptions [annexedMatchingOptions] $
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command "migrate" SectionUtility
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"switch data to different backend"
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paramPaths (withParams seek)
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seek :: CmdParams -> CommandSeek
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seek = withFilesInGit (commandAction . (whenAnnexed start)) <=< workTreeItems
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start :: FilePath -> Key -> CommandStart
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start file key = do
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forced <- Annex.getState Annex.force
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v <- Backend.getBackend file key
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case v of
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Nothing -> stop
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Just oldbackend -> do
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exists <- inAnnex key
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newbackend <- maybe defaultBackend return
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=<< chooseBackend file
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if (newbackend /= oldbackend || upgradableKey oldbackend key || forced) && exists
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then do
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showStart "migrate" file
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next $ perform file key oldbackend newbackend
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else stop
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{- Checks if a key is upgradable to a newer representation.
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-
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- Reasons for migration:
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- - Ideally, all keys have file size metadata. Old keys may not.
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- - Something has changed in the backend, such as a bug fix.
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-}
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upgradableKey :: Backend -> Key -> Bool
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upgradableKey backend key = isNothing (keySize key) || backendupgradable
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where
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backendupgradable = maybe False (\a -> a key) (canUpgradeKey backend)
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{- Store the old backend's key in the new backend
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- The old backend's key is not dropped from it, because there may
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- be other files still pointing at that key.
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-
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- To ensure that the data we have for the old key is valid, it's
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- fscked here. First we generate the new key. This ensures that the
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- data cannot get corrupted after the fsck but before the new key is
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- generated.
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-}
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perform :: FilePath -> Key -> Backend -> Backend -> CommandPerform
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perform file oldkey oldbackend newbackend = go =<< genkey (fastMigrate oldbackend)
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where
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go Nothing = stop
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go (Just (newkey, knowngoodcontent))
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| knowngoodcontent = finish newkey
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| otherwise = stopUnless checkcontent $ finish newkey
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checkcontent = Command.Fsck.checkBackend oldbackend oldkey Command.Fsck.KeyPresent afile
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finish newkey = ifM (Command.ReKey.linkKey file oldkey newkey)
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( do
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_ <- copyMetaData oldkey newkey
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-- If the old key had some associated urls, record them for
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-- the new key as well.
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urls <- getUrls oldkey
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forM_ urls $ \url ->
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setUrlPresent newkey url
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next $ Command.ReKey.cleanup file oldkey newkey
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, giveup "failed creating link from old to new key"
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)
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genkey Nothing = do
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content <- calcRepo $ gitAnnexLocation oldkey
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let source = KeySource
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{ keyFilename = file
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, contentLocation = content
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, inodeCache = Nothing
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}
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v <- genKey source (Just newbackend)
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return $ case v of
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Just (newkey, _) -> Just (newkey, False)
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_ -> Nothing
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genkey (Just fm) = fm oldkey newbackend afile >>= \case
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Just newkey -> return (Just (newkey, True))
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Nothing -> genkey Nothing
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afile = AssociatedFile (Just file)
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