b223988e22
--backend is no longer a global option, and is only accepted by commands that actually need it. Three commands that used to support backend but don't any longer are watch, webapp, and assistant. It would be possible to make them support it, but I doubt anyone used the option with these. And in the case of webapp and assistant, the option was handled inconsistently, only taking affect when the command is run with an existing git-annex repo, not when it creates a new one. Also, renamed GlobalOption etc to AnnexOption. Because there are many options of this type that are not actually global (any more) and get added to commands that need them. Sponsored-by: Kevin Mueller on Patreon
127 lines
4 KiB
Haskell
127 lines
4 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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import Utility.Metered
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cmd :: Command
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cmd = withAnnexOptions [backendOption, annexedMatchingOptions] $
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command "migrate" SectionUtility
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"switch data to different backend"
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paramPaths (seek <$$> optParser)
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data MigrateOptions = MigrateOptions
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{ migrateThese :: CmdParams
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, removeSize :: Bool
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}
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optParser :: CmdParamsDesc -> Parser MigrateOptions
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optParser desc = MigrateOptions
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<$> cmdParams desc
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<*> switch
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( long "remove-size"
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<> help "remove size field from keys"
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)
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seek :: MigrateOptions -> CommandSeek
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seek o = withFilesInGitAnnex ww seeker =<< workTreeItems ww (migrateThese o)
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where
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ww = WarnUnmatchLsFiles
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seeker = AnnexedFileSeeker
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{ startAction = start o
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, checkContentPresent = Nothing
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, usesLocationLog = False
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}
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start :: MigrateOptions -> SeekInput -> RawFilePath -> Key -> CommandStart
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start o si file key = do
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forced <- Annex.getRead Annex.force
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v <- Backend.getBackend (fromRawFilePath 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 go False oldbackend newbackend
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else if removeSize o && exists
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then go True oldbackend oldbackend
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else stop
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where
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go onlyremovesize oldbackend newbackend =
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starting "migrate" (mkActionItem (key, file)) si $
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perform onlyremovesize o file key oldbackend newbackend
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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 (fromKey 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 :: Bool -> MigrateOptions -> RawFilePath -> Key -> Backend -> Backend -> CommandPerform
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perform onlyremovesize o 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 (removesize newkey)
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| otherwise = stopUnless checkcontent $
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finish (removesize newkey)
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checkcontent = Command.Fsck.checkBackend oldbackend oldkey 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 newkey
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, giveup "failed creating link from old to new key"
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)
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genkey _ | onlyremovesize = return $ Just (oldkey, False)
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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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newkey <- fst <$> genKey source nullMeterUpdate (Just newbackend)
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return $ Just (newkey, False)
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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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removesize k
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| removeSize o = alterKey k $ \kd -> kd { keySize = Nothing }
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| otherwise = k
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afile = AssociatedFile (Just file)
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