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{- git-annex unused log file
-
- This file is stored locally in .git/annex/, not in the git-annex branch.
-
- The format: "int key timestamp"
-
- The int is a short, stable identifier that the user can use to
- refer to this key. (Equivilant to a filename.)
-
- The timestamp indicates when the key was first determined to be unused.
- Older versions of the log omit the timestamp.
-
- Copyright 2010-2014 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Logs.Unused (
UnusedMap,
updateUnusedLog,
readUnusedLog,
readUnusedMap,
unusedKeys,
) where
import qualified Data.Map as M
import Data.Time.Clock.POSIX
import Data.Time
import System.Locale
import Common.Annex
import Types.Key
import Utility.Tmp
-- everything that is stored in the unused log
type UnusedLog = M.Map Key (Int, Maybe POSIXTime)
-- used to look up unused keys specified by the user
type UnusedMap = M.Map Int Key
log2map :: UnusedLog -> UnusedMap
log2map = M.fromList . map (\(k, (i, _t)) -> (i, k)) . M.toList
map2log :: POSIXTime -> UnusedMap -> UnusedLog
map2log t = M.fromList . map (\(i, k) -> (k, (i, Just t))) . M.toList
{- Only keeps keys that are in the new log, but uses any timestamps
- those keys had in the old log. -}
preserveTimestamps :: UnusedLog -> UnusedLog -> UnusedLog
preserveTimestamps oldl newl = M.intersection (M.unionWith oldts oldl newl) newl
where
oldts _old@(_, ts) _new@(int, _) = (int, ts)
updateUnusedLog :: FilePath -> UnusedMap -> Annex ()
updateUnusedLog prefix m = do
oldl <- readUnusedLog prefix
newl <- preserveTimestamps oldl . flip map2log m <$> liftIO getPOSIXTime
writeUnusedLog prefix newl
writeUnusedLog :: FilePath -> UnusedLog -> Annex ()
writeUnusedLog prefix l = do
logfile <- fromRepo $ gitAnnexUnusedLog prefix
liftIO $ viaTmp writeFile logfile $ unlines $ map format $ M.toList l
where
format (k, (i, Just t)) = show i ++ " " ++ key2file k ++ " " ++ show t
format (k, (i, Nothing)) = show i ++ " " ++ key2file k
readUnusedLog :: FilePath -> Annex UnusedLog
readUnusedLog prefix = do
f <- fromRepo $ gitAnnexUnusedLog prefix
ifM (liftIO $ doesFileExist f)
( M.fromList . mapMaybe parse . lines
<$> liftIO (readFile f)
, return M.empty
)
where
parse line = case (readish sint, file2key skey, utcTimeToPOSIXSeconds <$> parseTime defaultTimeLocale "%s%Qs" ts) of
(Just int, Just key, mtimestamp) -> Just (key, (int, mtimestamp))
_ -> Nothing
where
(sint, rest) = separate (== ' ') line
(skey, ts) = separate (== ' ') rest
readUnusedMap :: FilePath -> Annex UnusedMap
readUnusedMap = log2map <$$> readUnusedLog
unusedKeys :: Annex [Key]
unusedKeys = M.keys <$> readUnusedLog ""
|
