f77979b8b5
All changes to files in the branch are now made via pure functions that transform the old file into the new. This will allow adding locking to prevent read/write races. It also makes the code nicer, and purer. I noticed a behavior change, really a sort of bug fix. Before, 'git annex untrust foo --trust bar' would change both trust levels permanantly, now the --trust doesn't get stored.
78 lines
2.1 KiB
Haskell
78 lines
2.1 KiB
Haskell
{- git-annex trust
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-
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- Copyright 2010 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 Trust (
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TrustLevel(..),
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trustLog,
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trustGet,
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trustSet,
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trustPartition
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) where
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import Control.Monad.State
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import qualified Data.Map as M
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import Data.List
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import Types.TrustLevel
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import qualified Branch
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import Types
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import UUID
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import qualified Annex
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{- Filename of trust.log. -}
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trustLog :: FilePath
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trustLog = "trust.log"
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{- Returns a list of UUIDs at the specified trust level. -}
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trustGet :: TrustLevel -> Annex [UUID]
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trustGet level = do
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m <- trustMap
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return $ M.keys $ M.filter (== level) m
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{- Read the trustLog into a map, overriding with any
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- values from forcetrust. The map is cached for speed. -}
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trustMap :: Annex TrustMap
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trustMap = do
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cached <- Annex.getState Annex.trustmap
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case cached of
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Just m -> return m
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Nothing -> do
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overrides <- Annex.getState Annex.forcetrust
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l <- Branch.get trustLog
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let m = M.fromList $ trustMapParse l ++ overrides
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Annex.changeState $ \s -> s { Annex.trustmap = Just m }
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return m
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{- Trust map parser. -}
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trustMapParse :: String -> [(UUID, TrustLevel)]
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trustMapParse s = map pair $ filter (not . null) $ lines s
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where
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pair l
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| length w > 1 = (w !! 0, read (w !! 1) :: TrustLevel)
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-- for back-compat; the trust log used to only
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-- list trusted uuids
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| otherwise = (w !! 0, Trusted)
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where
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w = words l
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{- Changes the trust level for a uuid in the trustLog. -}
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trustSet :: UUID -> TrustLevel -> Annex ()
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trustSet uuid level = do
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when (null uuid) $
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error "unknown UUID; cannot modify trust level"
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Branch.change trustLog $
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serialize . M.insert uuid level . M.fromList . trustMapParse
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Annex.changeState $ \s -> s { Annex.trustmap = Nothing }
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where
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serialize m = unlines $ map showpair $ M.toList m
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showpair (u, t) = u ++ " " ++ show t
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{- Partitions a list of UUIDs to those matching a TrustLevel and not. -}
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trustPartition :: TrustLevel -> [UUID] -> Annex ([UUID], [UUID])
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trustPartition level ls = do
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candidates <- trustGet level
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return $ partition (`elem` candidates) ls
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