be36e208c2
When a nonexistant file is passed to a command and --json-error-messages is enabled, output a JSON object indicating the problem. (But git ls-files --error-unmatch still displays errors about such files in some situations.) I don't like the duplication of the name of the command introduced by this, but I can't see a great way around it. One way would be to pass the Command instead. When json is not enabled, the stderr is unchanged. This is necessary because some commands like find have custom output. So dislaying "find foo not found" would be wrong. So had to complicate things with toplevelFileProblem having different output with and without json. When not using --json-error-messages but still using --json, it displays the error to stderr, but does display a json object without the error. It does have an errorid though. Unsure how useful that behavior is. Sponsored-by: Dartmouth College's Datalad project
126 lines
4 KiB
Haskell
126 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 "migrate"
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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 <- 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 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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