b9275b65f9
Looking at the few current callers, it's ok to have programPath throw an exception, in the unusual case where it cannot find git-annex.
109 lines
3.1 KiB
Haskell
109 lines
3.1 KiB
Haskell
{- git-annex assistant thread to detect when git-annex is upgraded
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-
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- Copyright 2013 Joey Hess <id@joeyh.name>
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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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{-# LANGUAGE CPP #-}
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module Assistant.Threads.UpgradeWatcher (
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upgradeWatcherThread
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) where
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import Assistant.Common
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import Assistant.Upgrade
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import Utility.DirWatcher
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import Utility.DirWatcher.Types
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import Utility.ThreadScheduler
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import Assistant.Types.UrlRenderer
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import Assistant.Alert
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import Assistant.DaemonStatus
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#ifdef WITH_WEBAPP
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import Assistant.WebApp.Types
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import qualified Build.SysConfig
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#endif
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import Control.Concurrent.MVar
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import qualified Data.Text as T
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data WatcherState = InStartupScan | Started | Upgrading
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deriving (Eq)
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upgradeWatcherThread :: UrlRenderer -> NamedThread
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upgradeWatcherThread urlrenderer = namedThread "UpgradeWatcher" $ do
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whenM (liftIO checkSuccessfulUpgrade) $
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showSuccessfulUpgrade urlrenderer
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go =<< liftIO upgradeFlagFile
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where
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go flagfile = do
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mvar <- liftIO $ newMVar InStartupScan
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changed <- Just <$> asIO2 (changedFile urlrenderer mvar flagfile)
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let hooks = mkWatchHooks
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{ addHook = changed
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, delHook = changed
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, addSymlinkHook = changed
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, modifyHook = changed
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, delDirHook = changed
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}
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let dir = parentDir flagfile
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let depth = length (splitPath dir) + 1
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let nosubdirs f = length (splitPath f) == depth
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void $ liftIO $ watchDir dir nosubdirs False hooks (startup mvar)
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-- Ignore bogus events generated during the startup scan.
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-- We ask the watcher to not generate them, but just to be safe..
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startup mvar scanner = do
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r <- scanner
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void $ swapMVar mvar Started
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return r
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changedFile :: UrlRenderer -> MVar WatcherState -> FilePath -> FilePath -> Maybe FileStatus -> Assistant ()
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changedFile urlrenderer mvar flagfile file _status
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| flagfile /= file = noop
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| otherwise = do
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state <- liftIO $ readMVar mvar
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when (state == Started) $ do
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setstate Upgrading
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ifM (liftIO upgradeSanityCheck)
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( handleUpgrade urlrenderer
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, do
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debug ["new version failed sanity check; not using"]
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setstate Started
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)
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where
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setstate = void . liftIO . swapMVar mvar
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handleUpgrade :: UrlRenderer -> Assistant ()
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handleUpgrade urlrenderer = do
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-- Wait 2 minutes for any final upgrade changes to settle.
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-- (For example, other associated files may be being put into
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-- place.) Not needed when using a distribution bundle, because
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-- in that case git-annex handles the upgrade in a non-racy way.
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liftIO $ unlessM usingDistribution $
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threadDelaySeconds (Seconds 120)
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ifM autoUpgradeEnabled
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( do
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debug ["starting automatic upgrade"]
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unattendedUpgrade
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#ifdef WITH_WEBAPP
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, do
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button <- mkAlertButton True (T.pack "Finish Upgrade") urlrenderer ConfigFinishUpgradeR
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void $ addAlert $ upgradeReadyAlert button
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#else
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, noop
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#endif
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)
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showSuccessfulUpgrade :: UrlRenderer -> Assistant ()
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showSuccessfulUpgrade urlrenderer = do
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#ifdef WITH_WEBAPP
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button <- ifM autoUpgradeEnabled
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( pure Nothing
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, Just <$> mkAlertButton True
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(T.pack "Enable Automatic Upgrades")
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urlrenderer ConfigEnableAutomaticUpgradeR
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)
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void $ addAlert $ upgradeFinishedAlert button Build.SysConfig.packageversion
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#else
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noop
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#endif
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