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.
63 lines
1.6 KiB
Haskell
63 lines
1.6 KiB
Haskell
{- git-annex location log
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-
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- git-annex keeps track of which repositories have the contents of annexed
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- files.
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-
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- Repositories record their UUID and the date when they --get or --drop
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- a value.
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-
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- Copyright 2010-2011 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 LocationLog (
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LogStatus(..),
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logChange,
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readLog,
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keyLocations,
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loggedKeys,
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logFile,
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logFileKey
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) where
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import System.FilePath
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import Control.Applicative
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import Data.Maybe
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import qualified Git
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import qualified Branch
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import UUID
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import Types
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import Locations
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import PresenceLog
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{- Log a change in the presence of a key's value in a repository. -}
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logChange :: Git.Repo -> Key -> UUID -> LogStatus -> Annex ()
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logChange repo key u s
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| null u = error $
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"unknown UUID for " ++ Git.repoDescribe repo ++
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" (have you run git annex init there?)"
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| otherwise = addLog (logFile key) =<< logNow s u
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{- Returns a list of repository UUIDs that, according to the log, have
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- the value of a key. -}
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keyLocations :: Key -> Annex [UUID]
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keyLocations = currentLog . logFile
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{- Finds all keys that have location log information.
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- (There may be duplicate keys in the list.) -}
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loggedKeys :: Annex [Key]
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loggedKeys = mapMaybe (logFileKey . takeFileName) <$> Branch.files
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{- The filename of the log file for a given key. -}
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logFile :: Key -> String
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logFile key = hashDirLower key ++ keyFile key ++ ".log"
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{- Converts a log filename into a key. -}
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logFileKey :: FilePath -> Maybe Key
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logFileKey file
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| end == ".log" = fileKey beginning
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| otherwise = Nothing
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where
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(beginning, end) = splitAt (length file - 4) file
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