94 lines
2.8 KiB
Haskell
94 lines
2.8 KiB
Haskell
{- git-annex assistant restarting
|
|
-
|
|
- Copyright 2013 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU AGPL version 3 or higher.
|
|
-}
|
|
|
|
{-# LANGUAGE CPP #-}
|
|
|
|
module Assistant.Restart where
|
|
|
|
import Assistant.Common
|
|
import Assistant.Threads.Watcher
|
|
import Assistant.DaemonStatus
|
|
import Assistant.NamedThread
|
|
import Utility.ThreadScheduler
|
|
import Utility.NotificationBroadcaster
|
|
import Utility.Url
|
|
import qualified Git.Construct
|
|
import qualified Git.Config
|
|
import Config.Files
|
|
import qualified Annex
|
|
import qualified Git
|
|
|
|
import Control.Concurrent
|
|
import System.Process (cwd)
|
|
#ifndef mingw32_HOST_OS
|
|
import System.Posix (getProcessID, signalProcess, sigTERM)
|
|
#endif
|
|
|
|
{- Before the assistant can be restarted, have to remove our
|
|
- gitAnnexUrlFile and our gitAnnexPidFile. Pausing the watcher is also
|
|
- a good idea, to avoid fighting when two assistants are running in the
|
|
- same repo.
|
|
-}
|
|
prepRestart :: Assistant ()
|
|
prepRestart = do
|
|
liftIO . maybe noop (`throwTo` PauseWatcher) =<< namedThreadId watchThread
|
|
liftIO . nukeFile =<< liftAnnex (fromRepo gitAnnexUrlFile)
|
|
liftIO . nukeFile =<< liftAnnex (fromRepo gitAnnexPidFile)
|
|
|
|
{- To finish a restart, send a global redirect to the new url
|
|
- to any web browsers that are displaying the webapp.
|
|
-
|
|
- Wait for browser to update before terminating this process. -}
|
|
postRestart :: URLString -> Assistant ()
|
|
postRestart url = do
|
|
#ifndef mingw32_HOST_OS
|
|
modifyDaemonStatus_ $ \status -> status { globalRedirUrl = Just url }
|
|
liftIO . sendNotification . globalRedirNotifier =<< getDaemonStatus
|
|
void $ liftIO $ forkIO $ do
|
|
threadDelaySeconds (Seconds 120)
|
|
signalProcess sigTERM =<< getProcessID
|
|
#else
|
|
error "TODO windows postRestart"
|
|
#endif
|
|
|
|
runRestart :: Assistant URLString
|
|
runRestart = liftIO . newAssistantUrl
|
|
=<< liftAnnex (Git.repoLocation <$> Annex.gitRepo)
|
|
|
|
{- Starts up the assistant in the repository, and waits for it to create
|
|
- a gitAnnexUrlFile. Waits for the assistant to be up and listening for
|
|
- connections by testing the url. -}
|
|
newAssistantUrl :: FilePath -> IO URLString
|
|
newAssistantUrl repo = do
|
|
startAssistant repo
|
|
geturl
|
|
where
|
|
geturl = do
|
|
r <- Git.Config.read =<< Git.Construct.fromPath repo
|
|
waiturl $ gitAnnexUrlFile r
|
|
waiturl urlfile = do
|
|
v <- tryIO $ readFile urlfile
|
|
case v of
|
|
Left _ -> delayed $ waiturl urlfile
|
|
Right url -> ifM (listening url)
|
|
( return url
|
|
, delayed $ waiturl urlfile
|
|
)
|
|
listening url = catchBoolIO $ fst <$> exists url [] Nothing
|
|
delayed a = do
|
|
threadDelay 100000 -- 1/10th of a second
|
|
a
|
|
|
|
{- Returns once the assistant has daemonized, but possibly before it's
|
|
- listening for web connections. -}
|
|
startAssistant :: FilePath -> IO ()
|
|
startAssistant repo = do
|
|
program <- readProgramFile
|
|
(_, _, _, pid) <-
|
|
createProcess $
|
|
(proc program ["assistant"]) { cwd = Just repo }
|
|
void $ checkSuccessProcess pid
|