38b9ebc5fd
Noticed that Semigroup instance of Map is not suitable to use
for MapLog. For example, it behaved like this:
ghci> parseTrustLog "foo 1 timestamp=10\nfoo 2 timestamp=11" <> parseTrustLog "foo X timestamp=12"
fromList [(UUID "foo",LogEntry {changed = VectorClock 11s, value = SemiTrusted})]
Which was wrong, it lost the newer DeadTrusted value.
Luckily, nothing used that Semigroup when operating on a MapLog. And this
provides a safe instance.
Sponsored-by: Graham Spencer on Patreon
52 lines
1.5 KiB
Haskell
52 lines
1.5 KiB
Haskell
{- git-annex trust log, pure operations
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-
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- Copyright 2010-2018 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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{-# LANGUAGE OverloadedStrings #-}
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module Logs.Trust.Pure where
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import Annex.Common
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import Types.TrustLevel
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import Logs.UUIDBased
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Attoparsec.ByteString as A
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import qualified Data.Attoparsec.ByteString.Char8 as A8
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import Data.ByteString.Builder
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calcTrustMap :: L.ByteString -> TrustMap
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calcTrustMap = simpleMap . parseTrustLog
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parseTrustLog :: L.ByteString -> Log TrustLevel
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parseTrustLog = parseLogOld trustLevelParser
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trustLevelParser :: A.Parser TrustLevel
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trustLevelParser = (totrust <$> A8.anyChar <* A.endOfInput)
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-- The trust log used to only list trusted repos, without a
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-- value for the trust status
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<|> (const Trusted <$> A.endOfInput)
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where
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totrust '1' = Trusted
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totrust '0' = UnTrusted
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totrust 'X' = DeadTrusted
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-- Allow for future expansion by treating unknown trust levels as
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-- semitrusted.
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totrust _ = SemiTrusted
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buildTrustLevel :: TrustLevel -> Builder
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buildTrustLevel Trusted = byteString "1"
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buildTrustLevel UnTrusted = byteString "0"
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buildTrustLevel DeadTrusted = byteString "X"
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buildTrustLevel SemiTrusted = byteString "?"
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prop_parse_build_TrustLevelLog :: Bool
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prop_parse_build_TrustLevelLog = all check [minBound .. maxBound]
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where
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check l =
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let v = A.parseOnly trustLevelParser $ L.toStrict $
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toLazyByteString $ buildTrustLevel l
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in v == Right l
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