86 lines
2.6 KiB
Haskell
86 lines
2.6 KiB
Haskell
{- git-annex uuids
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-
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- Each git repository used by git-annex has an annex.uuid setting that
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- uniquely identifies that repository.
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-
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- UUIDs of remotes are cached in git config, using keys named
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- remote.<name>.annex-uuid
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-
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- uuid.log stores a list of known uuids, and their descriptions.
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-
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- Copyright 2010-2012 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 Logs.UUID (
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uuidLog,
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describeUUID,
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uuidMap,
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uuidMapLoad
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) where
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import Types.UUID
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import Annex.Common
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import Annex.VectorClock
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import qualified Annex
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import qualified Annex.Branch
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import Logs
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import Logs.UUIDBased
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import qualified Annex.UUID
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import qualified Data.Map as M
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{- Records a description for a uuid in the log. -}
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describeUUID :: UUID -> String -> Annex ()
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describeUUID uuid desc = do
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c <- liftIO currentVectorClock
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Annex.Branch.change uuidLog $
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showLog id . changeLog c uuid desc . fixBadUUID . parseLog Just
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{- Temporarily here to fix badly formatted uuid logs generated by
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- versions 3.20111105 and 3.20111025.
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-
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- Those logs contain entries with the UUID and description flipped.
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- Due to parsing, if the description is multiword, only the first
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- will be taken to be the UUID. So, if the UUID of an entry does
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- not look like a UUID, and the last word of the description does,
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- flip them back.
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-}
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fixBadUUID :: Log String -> Log String
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fixBadUUID = M.fromList . map fixup . M.toList
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where
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fixup (k, v)
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| isbad = (fixeduuid, LogEntry (newertime v) fixedvalue)
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| otherwise = (k, v)
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where
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kuuid = fromUUID k
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isbad = not (isuuid kuuid) && not (null ws) && isuuid lastword
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ws = words $ value v
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lastword = Prelude.last ws
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fixeduuid = toUUID lastword
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fixedvalue = unwords $ kuuid: Prelude.init ws
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-- For the fixed line to take precidence, it should be
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-- slightly newer, but only slightly.
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newertime (LogEntry (VectorClock c) _) = VectorClock (c + minimumPOSIXTimeSlice)
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newertime (LogEntry Unknown _) = VectorClock minimumPOSIXTimeSlice
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minimumPOSIXTimeSlice = 0.000001
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isuuid s = length s == 36 && length (splitc '-' s) == 5
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{- The map is cached for speed. -}
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uuidMap :: Annex UUIDMap
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uuidMap = maybe uuidMapLoad return =<< Annex.getState Annex.uuidmap
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{- Read the uuidLog into a simple Map.
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-
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- The UUID of the current repository is included explicitly, since
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- it may not have been described and so otherwise would not appear. -}
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uuidMapLoad :: Annex UUIDMap
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uuidMapLoad = do
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m <- (simpleMap . parseLog Just) <$> Annex.Branch.get uuidLog
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u <- Annex.UUID.getUUID
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let m' = M.insertWith' preferold u "" m
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Annex.changeState $ \s -> s { Annex.uuidmap = Just m' }
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return m'
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where
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preferold = flip const
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