4c1e3210fa
It takes a single key-value backend, rather than the unncessary and confusing list. The old option still works if set. Simplified some old old code too. This commit was sponsored by Thomas Hochstein on Patreon.
100 lines
3.1 KiB
Haskell
100 lines
3.1 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 GPL 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 qualified Remote
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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 $ whenAnnexed start
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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
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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.KeyLocked 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 -> do
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r <- Remote.claimingUrl url
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setUrlPresent (Remote.uuid r) newkey url
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next $ Command.ReKey.cleanup file oldkey newkey
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, error "failed"
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)
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genkey = case maybe Nothing (\fm -> fm oldkey newbackend afile) (fastMigrate oldbackend) of
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Just newkey -> return $ Just (newkey, True)
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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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afile = AssociatedFile (Just file)
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