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{- git-annex assistant sanity checker
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Threads.SanityChecker (
sanityCheckerThread
) where
import Assistant.Common
import Assistant.DaemonStatus
import Assistant.Alert
import qualified Git.LsFiles
import Utility.ThreadScheduler
import qualified Assistant.Threads.Watcher as Watcher
import Data.Time.Clock.POSIX
{- This thread wakes up occasionally to make sure the tree is in good shape. -}
sanityCheckerThread :: NamedThread
sanityCheckerThread = NamedThread "SanityChecker" $ forever $ do
waitForNextCheck
debug ["starting sanity check"]
void $ alertWhile sanityCheckAlert go
debug ["sanity check complete"]
where
go = do
modifyDaemonStatus_ $ \s -> s { sanityCheckRunning = True }
now <- liftIO $ getPOSIXTime -- before check started
r <- either showerr return =<< tryIO <~> check
modifyDaemonStatus_ $ \s -> s
{ sanityCheckRunning = False
, lastSanityCheck = Just now
}
return r
showerr e = do
liftAnnex $ warning $ show e
return False
{- Only run one check per day, from the time of the last check. -}
waitForNextCheck :: Assistant ()
waitForNextCheck = do
v <- lastSanityCheck <$> getDaemonStatus
now <- liftIO getPOSIXTime
liftIO $ threadDelaySeconds $ Seconds $ calcdelay now v
where
calcdelay _ Nothing = oneDay
calcdelay now (Just lastcheck)
| lastcheck < now = max oneDay $
oneDay - truncate (now - lastcheck)
| otherwise = oneDay
oneDay :: Int
oneDay = 24 * 60 * 60
{- It's important to stay out of the Annex monad as much as possible while
- running potentially expensive parts of this check, since remaining in it
- will block the watcher. -}
check :: Assistant Bool
check = do
g <- liftAnnex gitRepo
-- Find old unstaged symlinks, and add them to git.
(unstaged, cleanup) <- liftIO $ Git.LsFiles.notInRepo False ["."] g
now <- liftIO $ getPOSIXTime
forM_ unstaged $ \file -> do
ms <- liftIO $ catchMaybeIO $ getSymbolicLinkStatus file
case ms of
Just s | toonew (statusChangeTime s) now -> noop
| isSymbolicLink s -> addsymlink file ms
_ -> noop
liftIO $ void cleanup
return True
where
toonew timestamp now = now < (realToFrac (timestamp + slop) :: POSIXTime)
slop = fromIntegral tenMinutes
insanity msg = do
liftAnnex $ warning msg
void $ addAlert $ sanityCheckFixAlert msg
addsymlink file s = do
Watcher.runHandler Watcher.onAddSymlink file s
insanity $ "found unstaged symlink: " ++ file
|
