bfc9039ead
Most of the individual logs are not converted yet, only presense logs have an efficient ByteString Builder implemented so far. The rest convert to and from String.
87 lines
2.8 KiB
Haskell
87 lines
2.8 KiB
Haskell
{- git-annex transitions log
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-
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- This is used to record transitions that have been performed on the
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- git-annex branch, and when the transition was first started.
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-
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- We can quickly detect when the local branch has already had an transition
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- done that is listed in the remote branch by checking that the local
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- branch contains the same transition, with the same or newer start time.
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-
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- Copyright 2013 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.Transitions where
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import Annex.Common
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import Annex.VectorClock
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import Logs.Line
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import qualified Data.Set as S
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import qualified Data.ByteString.Lazy as L
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transitionsLog :: FilePath
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transitionsLog = "transitions.log"
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data Transition
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= ForgetGitHistory
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| ForgetDeadRemotes
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deriving (Show, Ord, Eq, Read)
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data TransitionLine = TransitionLine
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{ transitionStarted :: VectorClock
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, transition :: Transition
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} deriving (Ord, Eq)
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type Transitions = S.Set TransitionLine
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describeTransition :: Transition -> String
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describeTransition ForgetGitHistory = "forget git history"
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describeTransition ForgetDeadRemotes = "forget dead remotes"
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noTransitions :: Transitions
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noTransitions = S.empty
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addTransition :: VectorClock -> Transition -> Transitions -> Transitions
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addTransition c t = S.insert $ TransitionLine c t
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showTransitions :: Transitions -> String
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showTransitions = unlines . map showTransitionLine . S.elems
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{- If the log contains new transitions we don't support, returns Nothing. -}
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parseTransitions :: String -> Maybe Transitions
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parseTransitions = check . map parseTransitionLine . splitLines
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where
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check l
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| all isJust l = Just $ S.fromList $ catMaybes l
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| otherwise = Nothing
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parseTransitionsStrictly :: String -> String -> Transitions
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parseTransitionsStrictly source = fromMaybe badsource . parseTransitions
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where
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badsource = giveup $ "unknown transitions listed in " ++ source ++ "; upgrade git-annex!"
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showTransitionLine :: TransitionLine -> String
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showTransitionLine (TransitionLine c t) = unwords [show t, formatVectorClock c]
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parseTransitionLine :: String -> Maybe TransitionLine
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parseTransitionLine s = TransitionLine
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<$> parseVectorClock cs
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<*> readish ts
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where
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ws = words s
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ts = Prelude.head ws
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cs = unwords $ Prelude.tail ws
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combineTransitions :: [Transitions] -> Transitions
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combineTransitions = S.unions
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transitionList :: Transitions -> [Transition]
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transitionList = nub . map transition . S.elems
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{- Typically ran with Annex.Branch.change, but we can't import Annex.Branch
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- here since it depends on this module. -}
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recordTransitions :: (FilePath -> (L.ByteString -> L.ByteString) -> Annex ()) -> Transitions -> Annex ()
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recordTransitions changer t = changer transitionsLog $
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encodeBL . showTransitions . S.union t . parseTransitionsStrictly "local" . decodeBL
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