7ce30b534f
In indirect mode, now checks the inode cache to detect changes to a file. Note that a file can still be changed if a process has it open for write, after landing in the annex. In direct mode, some checking of the inode cache was done before, but from a much later point, so fewer modifications could be detected. Now it's as good as indirect mode. On crippled filesystems, no lock down is done before starting to add a file, so checking the inode cache is the only protection we have.
71 lines
2.1 KiB
Haskell
71 lines
2.1 KiB
Haskell
{- git-annex command
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-
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- Copyright 2011 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Command.Migrate where
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import Common.Annex
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import Command
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import Backend
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import qualified Types.Key
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import qualified Types.Backend
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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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def :: [Command]
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def = [notDirect $
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command "migrate" paramPaths seek "switch data to different backend"]
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seek :: [CommandSeek]
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seek = [withFilesInGit $ whenAnnexed start]
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start :: FilePath -> (Key, Backend) -> CommandStart
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start file (key, oldbackend) = do
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exists <- inAnnex key
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newbackend <- choosebackend =<< chooseBackend file
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if (newbackend /= oldbackend || upgradableKey oldbackend key) && 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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where
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choosebackend Nothing = Prelude.head <$> orderedList
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choosebackend (Just backend) = return backend
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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 (Types.Key.keySize key) || backendupgradable
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where
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backendupgradable = maybe False (\a -> a key)
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(Types.Backend.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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perform :: FilePath -> Key -> Backend -> Backend -> CommandPerform
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perform file oldkey oldbackend newbackend = do
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ifM (Command.Fsck.checkBackend oldbackend oldkey)
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( maybe stop go =<< genkey
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, stop
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)
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where
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go newkey = stopUnless (Command.ReKey.linkKey oldkey newkey) $
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next $ Command.ReKey.cleanup file oldkey newkey
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genkey = do
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content <- inRepo $ 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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liftM fst <$> genKey source (Just newbackend)
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