124 lines
3.8 KiB
Haskell
124 lines
3.8 KiB
Haskell
{- user-specified limits on files to act on
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-
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- Copyright 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 Limit where
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import Text.Regex.PCRE.Light.Char8
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import System.Path.WildMatch
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import Data.Time.Clock.POSIX
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import Common.Annex
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import qualified Annex
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import qualified Utility.Matcher
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import qualified Remote
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import qualified Backend
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import Annex.Content
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import Logs.Trust
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import Utility.HumanTime
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type Limit = Utility.Matcher.Token (FilePath -> Annex Bool)
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{- Checks if there are user-specified limits. -}
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limited :: Annex Bool
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limited = (not . Utility.Matcher.matchesAny) <$> getMatcher'
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{- Gets a matcher for the user-specified limits. The matcher is cached for
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- speed; once it's obtained the user-specified limits can't change. -}
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getMatcher :: Annex (FilePath -> Annex Bool)
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getMatcher = Utility.Matcher.matchM <$> getMatcher'
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getMatcher' :: Annex (Utility.Matcher.Matcher (FilePath -> Annex Bool))
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getMatcher' = do
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m <- Annex.getState Annex.limit
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case m of
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Right r -> return r
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Left l -> do
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let matcher = Utility.Matcher.generate (reverse l)
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Annex.changeState $ \s -> s { Annex.limit = Right matcher }
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return matcher
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{- Adds something to the limit list, which is built up reversed. -}
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add :: Limit -> Annex ()
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add l = Annex.changeState $ \s -> s { Annex.limit = prepend $ Annex.limit s }
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where
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prepend (Left ls) = Left $ l:ls
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prepend _ = error "internal"
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{- Adds a new token. -}
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addToken :: String -> Annex ()
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addToken = add . Utility.Matcher.token
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{- Adds a new limit. -}
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addLimit :: (FilePath -> Annex Bool) -> Annex ()
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addLimit = add . Utility.Matcher.Operation
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{- Add a limit to skip files that do not match the glob. -}
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addInclude :: String -> Annex ()
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addInclude glob = addLimit $ return . matchglob glob
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{- Add a limit to skip files that match the glob. -}
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addExclude :: String -> Annex ()
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addExclude glob = addLimit $ return . not . matchglob glob
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matchglob :: String -> FilePath -> Bool
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matchglob glob f = isJust $ match cregex f []
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where
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cregex = compile regex []
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regex = '^':wildToRegex glob
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{- Adds a limit to skip files not believed to be present
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- in a specfied repository. -}
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addIn :: String -> Annex ()
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addIn name = addLimit $ check $ if name == "." then inAnnex else inremote
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where
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check a = Backend.lookupFile >=> handle a
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handle _ Nothing = return False
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handle a (Just (key, _)) = a key
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inremote key = do
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u <- Remote.nameToUUID name
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us <- Remote.keyLocations key
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return $ u `elem` us
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{- Adds a limit to skip files not believed to have the specified number
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- of copies. -}
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addCopies :: String -> Annex ()
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addCopies trust_num = addLimit . check $ readnum num
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where
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(num, mayCheckTrust) = case split ":" trust_num of
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[trust, num'] -> (num', checkTrust (readtrust trust))
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[num'] -> (num', const (return True))
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_ -> bad
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readnum = maybe bad id . readish
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readtrust = maybe bad id . readTrust
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check n = Backend.lookupFile >=> handle n
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handle _ Nothing = return False
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handle n (Just (key, _)) = do
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us <- filterM mayCheckTrust =<< Remote.keyLocations key
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return $ length us >= n
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checkTrust t u = (== t) <$> lookupTrust u
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bad = error "bad number or trust:number for --copies"
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{- Adds a limit to skip files not using a specified key-value backend. -}
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addInBackend :: String -> Annex ()
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addInBackend name = addLimit $ Backend.lookupFile >=> check
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where
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wanted = Backend.lookupBackendName name
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check = return . maybe False ((==) wanted . snd)
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addTimeLimit :: String -> Annex ()
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addTimeLimit s = do
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let seconds = fromMaybe (error "bad time-limit") $ parseDuration s
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start <- liftIO getPOSIXTime
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let cutoff = start + seconds
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addLimit $ const $ do
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now <- liftIO getPOSIXTime
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if now > cutoff
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then do
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warning $ "Time limit (" ++ s ++ ") reached!"
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liftIO $ exitWith $ ExitFailure 101
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else return True
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