84 lines
2.8 KiB
Haskell
84 lines
2.8 KiB
Haskell
{- git-annex log file that indicates when the adjusted branch needs to be
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- updated due to changes in content availability.
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-
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- Copyright 2023 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.AdjustedBranchUpdate (
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recordAdjustedBranchUpdateNeeded,
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recordAdjustedBranchUpdateFinished,
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isAdjustedBranchUpdateNeeded,
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) where
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import Annex.Common
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import Logs.File
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import Utility.TimeStamp
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import qualified Data.ByteString.Lazy as L
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import Data.Time.Clock.POSIX
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-- | Updates the log to indicate that an update is needed.
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recordAdjustedBranchUpdateNeeded :: Annex ()
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recordAdjustedBranchUpdateNeeded = do
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now <- liftIO getPOSIXTime
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logf <- fromRepo gitAnnexAdjustedBranchUpdateLog
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lckf <- fromRepo gitAnnexAdjustedBranchUpdateLock
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-- Replace any other log entries, because an update is needed now,
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-- so an entry that says an update finished must be in the past.
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-- And, if there were clock skew, an entry that says an update is
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-- needed in the future would be wrong information.
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modifyLogFile logf lckf (const [formatAdjustLog True now])
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-- | Called after an update has finished. The time is when the update
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-- started. If recordAdjustedBranchUpdateNeeded was called during the
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-- update, the log is left indicating that an update is still needed.
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recordAdjustedBranchUpdateFinished :: POSIXTime -> Annex ()
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recordAdjustedBranchUpdateFinished starttime = do
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now <- liftIO getPOSIXTime
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logf <- fromRepo gitAnnexAdjustedBranchUpdateLog
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lckf <- fromRepo gitAnnexAdjustedBranchUpdateLock
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modifyLogFile logf lckf (go now)
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where
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go now logged
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| null $ filter (isnewer now) $ mapMaybe parseAdjustLog logged =
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[formatAdjustLog False starttime]
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| otherwise = logged
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-- If the logged time is in the future, there was clock skew,
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-- so disregard that log entry.
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isnewer now (_, loggedtime) =
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loggedtime >= starttime && loggedtime <= now
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isAdjustedBranchUpdateNeeded :: Annex Bool
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isAdjustedBranchUpdateNeeded = do
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logf <- fromRepo gitAnnexAdjustedBranchUpdateLog
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lckf <- fromRepo gitAnnexAdjustedBranchUpdateLock
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calcLogFile logf lckf Nothing go >>= return . \case
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Just b -> b
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-- No log, so assume an update is needed.
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-- This handles upgrades from before this log was written.
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Nothing -> True
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where
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go l p = case parseAdjustLog l of
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Nothing -> p
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Just (b, _t) -> case p of
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Nothing -> Just b
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Just b' -> Just (b' || b)
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formatAdjustLog :: Bool -> POSIXTime -> L.ByteString
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formatAdjustLog b t = encodeBL (show t) <> " " <> if b then "1" else "0"
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parseAdjustLog :: L.ByteString -> Maybe (Bool, POSIXTime)
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parseAdjustLog l =
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let (ts, bs) = separate (== ' ') (decodeBL l)
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in do
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b <- case bs of
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"1" -> Just True
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"0" -> Just False
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_ -> Nothing
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t <- parsePOSIXTime (encodeBS ts)
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return (b, t)
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