34c8af74ba
I've been disliking how the command seek actions were written for some time, with their inversion of control and ugly workarounds. The last straw to fix it was sync --content, which didn't fit the Annex [CommandStart] interface well at all. I have not yet made it take advantage of the changed interface though. The crucial change, and probably why I didn't do it this way from the beginning, is to make each CommandStart action be run with exceptions caught, and if it fails, increment a failure counter in annex state. So I finally remove the very first code I wrote for git-annex, which was before I had exception handling in the Annex monad, and so ran outside that monad, passing state explicitly as it ran each CommandStart action. This was a real slog from 1 to 5 am. Test suite passes. Memory usage is lower than before, sometimes by a couple of megabytes, and remains constant, even when running in a large repo, and even when repeatedly failing and incrementing the error counter. So no accidental laziness space leaks. Wall clock speed is identical, even in large repos. This commit was sponsored by an anonymous bitcoiner.
89 lines
2.5 KiB
Haskell
89 lines
2.5 KiB
Haskell
{- git-annex assistant
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-
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- Copyright 2012 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 Command.Assistant where
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import Common.Annex
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import Command
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import qualified Option
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import qualified Command.Watch
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import Init
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import Config.Files
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import qualified Build.SysConfig
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import Utility.HumanTime
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import System.Environment
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def :: [Command]
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def = [noRepo checkAutoStart $ dontCheck repoExists $ withOptions options $
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command "assistant" paramNothing seek SectionCommon
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"automatically handle changes"]
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options :: [Option]
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options =
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[ Command.Watch.foregroundOption
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, Command.Watch.stopOption
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, autoStartOption
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, startDelayOption
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]
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autoStartOption :: Option
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autoStartOption = Option.flag [] "autostart" "start in known repositories"
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startDelayOption :: Option
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startDelayOption = Option.field [] "startdelay" paramNumber "delay before running startup scan"
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seek :: CommandSeek
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seek ps = do
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stopdaemon <- getOptionFlag Command.Watch.stopOption
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foreground <- getOptionFlag Command.Watch.foregroundOption
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autostart <- getOptionFlag autoStartOption
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startdelay <- getOptionField startDelayOption (pure . maybe Nothing parseDuration)
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withNothing (start foreground stopdaemon autostart startdelay) ps
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start :: Bool -> Bool -> Bool -> Maybe Duration -> CommandStart
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start foreground stopdaemon autostart startdelay
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| autostart = do
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liftIO $ autoStart startdelay
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stop
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| otherwise = do
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ensureInitialized
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Command.Watch.start True foreground stopdaemon startdelay
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{- Run outside a git repository. Check to see if any parameter is
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- --autostart and enter autostart mode. -}
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checkAutoStart :: CmdParams -> IO ()
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checkAutoStart _ = ifM (elem "--autostart" <$> getArgs)
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( autoStart Nothing
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, error "Not in a git repository."
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)
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autoStart :: Maybe Duration -> IO ()
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autoStart startdelay = do
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dirs <- liftIO readAutoStartFile
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when (null dirs) $ do
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f <- autoStartFile
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error $ "Nothing listed in " ++ f
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program <- readProgramFile
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haveionice <- pure Build.SysConfig.ionice <&&> inPath "ionice"
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forM_ dirs $ \d -> do
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putStrLn $ "git-annex autostart in " ++ d
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ifM (catchBoolIO $ go haveionice program d)
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( putStrLn "ok"
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, putStrLn "failed"
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)
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where
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go haveionice program dir = do
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setCurrentDirectory dir
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if haveionice
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then boolSystem "ionice" (Param "-c3" : Param program : baseparams)
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else boolSystem program baseparams
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where
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baseparams =
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[ Param "assistant"
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, Param $ "--startdelay=" ++ fromDuration (fromMaybe (Duration 5) startdelay)
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]
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