63 lines
2.3 KiB
Haskell
63 lines
2.3 KiB
Haskell
{- git-annex branch transitions
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-
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- Copyright 2013 Joey Hess <joey@kitenet.net>
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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 Annex.Branch.Transitions (
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FileTransition(..),
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getTransitionCalculator
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) where
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import Logs
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import Logs.Transitions
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import qualified Logs.UUIDBased as UUIDBased
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import qualified Logs.Presence.Pure as Presence
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import qualified Logs.Chunk.Pure as Chunk
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import Types.TrustLevel
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import Types.UUID
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import qualified Data.Map as M
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data FileTransition
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= ChangeFile String
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| RemoveFile
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| PreserveFile
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type TransitionCalculator = FilePath -> String -> TrustMap -> FileTransition
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getTransitionCalculator :: Transition -> Maybe TransitionCalculator
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getTransitionCalculator ForgetGitHistory = Nothing
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getTransitionCalculator ForgetDeadRemotes = Just dropDead
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dropDead :: FilePath -> String -> TrustMap -> FileTransition
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dropDead f content trustmap = case getLogVariety f of
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Just UUIDBasedLog
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-- Don't remove the dead repo from the trust log,
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-- because git remotes may still exist, and they need
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-- to still know it's dead.
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| f == trustLog -> PreserveFile
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| otherwise -> ChangeFile $ UUIDBased.showLog id $ dropDeadFromMapLog trustmap id $ UUIDBased.parseLog Just content
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Just NewUUIDBasedLog -> ChangeFile $
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UUIDBased.showLogNew id $ dropDeadFromMapLog trustmap id $ UUIDBased.parseLogNew Just content
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Just (ChunkLog _) -> ChangeFile $
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Chunk.showLog $ dropDeadFromMapLog trustmap fst $ Chunk.parseLog content
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Just (PresenceLog _) ->
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let newlog = Presence.compactLog $ dropDeadFromPresenceLog trustmap $ Presence.parseLog content
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in if null newlog
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then RemoveFile
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else ChangeFile $ Presence.showLog newlog
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Just OtherLog -> PreserveFile
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Nothing -> PreserveFile
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dropDeadFromMapLog :: Ord k => TrustMap -> (k -> UUID) -> M.Map k v -> M.Map k v
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dropDeadFromMapLog trustmap getuuid = M.filterWithKey $ \k _v -> notDead trustmap getuuid k
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{- Presence logs can contain UUIDs or other values. Any line that matches
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- a dead uuid is dropped; any other values are passed through. -}
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dropDeadFromPresenceLog :: TrustMap -> [Presence.LogLine] -> [Presence.LogLine]
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dropDeadFromPresenceLog trustmap = filter $ notDead trustmap (toUUID . Presence.info)
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notDead :: TrustMap -> (v -> UUID) -> v -> Bool
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notDead trustmap a v = M.findWithDefault SemiTrusted (a v) trustmap /= DeadTrusted
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