220 lines
6.6 KiB
Haskell
220 lines
6.6 KiB
Haskell
{- git-annex webapp launcher
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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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{-# LANGUAGE CPP #-}
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module Command.WebApp where
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import Common.Annex
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import Command
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import Assistant
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import Assistant.Common
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import Assistant.NamedThread
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import Assistant.Threads.WebApp
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import Assistant.WebApp
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import Assistant.Install
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import Annex.Environment
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import Utility.WebApp
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import Utility.Daemon (checkDaemon)
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#ifdef __ANDROID__
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import Utility.Env
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#endif
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import Init
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import qualified Git
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import qualified Git.Config
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import qualified Git.CurrentRepo
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import qualified Annex
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import Config.Files
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import qualified Option
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import Control.Concurrent
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import Control.Concurrent.STM
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import System.Process (env, std_out, std_err)
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import Network.Socket (HostName)
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import System.Environment (getArgs)
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def :: [Command]
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def = [ withOptions [listenOption] $
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noCommit $ noRepo startNoRepo $ dontCheck repoExists $ notBareRepo $
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command "webapp" paramNothing seek SectionCommon "launch webapp"]
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listenOption :: Option
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listenOption = Option.field [] "listen" paramAddress
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"accept connections to this address"
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seek :: [CommandSeek]
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seek = [withField listenOption return $ \listenhost ->
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withNothing $ start listenhost]
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start :: Maybe HostName -> CommandStart
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start = start' True
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start' :: Bool -> Maybe HostName -> CommandStart
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start' allowauto listenhost = do
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liftIO $ ensureInstalled
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ifM isInitialized ( go , auto )
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stop
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where
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go = do
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browser <- fromRepo webBrowser
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f <- liftIO . absPath =<< fromRepo gitAnnexHtmlShim
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ifM (checkpid <&&> checkshim f)
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( if isJust listenhost
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then error "The assistant is already running, so --listen cannot be used."
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else do
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url <- liftIO . readFile
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=<< fromRepo gitAnnexUrlFile
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liftIO $ openBrowser browser f url Nothing Nothing
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, startDaemon True True listenhost $ Just $
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\origout origerr url htmlshim ->
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if isJust listenhost
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then maybe noop (`hPutStrLn` url) origout
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else openBrowser browser htmlshim url origout origerr
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)
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auto
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| allowauto = liftIO startNoRepo
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| otherwise = do
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d <- liftIO getCurrentDirectory
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error $ "no git repository in " ++ d
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checkpid = do
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pidfile <- fromRepo gitAnnexPidFile
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liftIO $ isJust <$> checkDaemon pidfile
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checkshim f = liftIO $ doesFileExist f
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{- When run without a repo, start the first available listed repository in
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- the autostart file. If not, it's our first time being run! -}
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startNoRepo :: IO ()
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startNoRepo = do
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-- FIXME should be able to reuse regular getopt, but
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-- it currently runs in the Annex monad.
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args <- getArgs
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let listenhost = headMaybe $ map (snd . separate (== '=')) $
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filter ("--listen=" `isPrefixOf`) args
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dirs <- liftIO $ filterM doesDirectoryExist =<< readAutoStartFile
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case dirs of
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[] -> firstRun listenhost
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(d:_) -> do
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setCurrentDirectory d
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state <- Annex.new =<< Git.CurrentRepo.get
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void $ Annex.eval state $ doCommand $
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start' False listenhost
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{- Run the webapp without a repository, which prompts the user, makes one,
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- changes to it, starts the regular assistant, and redirects the
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- browser to its url.
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-
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- This is a very tricky dance -- The first webapp calls the signaler,
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- which signals the main thread when it's ok to continue by writing to a
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- MVar. The main thread starts the second webapp, and uses its callback
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- to write its url back to the MVar, from where the signaler retrieves it,
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- returning it to the first webapp, which does the redirect.
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-
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- Note that it's important that mainthread never terminates! Much
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- of this complication is due to needing to keep the mainthread running.
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-}
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firstRun :: Maybe HostName -> IO ()
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firstRun listenhost = do
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checkEnvironmentIO
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{- Without a repository, we cannot have an Annex monad, so cannot
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- get a ThreadState. Using undefined is only safe because the
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- webapp checks its noAnnex field before accessing the
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- threadstate. -}
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let st = undefined
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{- Get a DaemonStatus without running in the Annex monad. -}
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dstatus <- atomically . newTMVar =<< newDaemonStatus
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d <- newAssistantData st dstatus
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urlrenderer <- newUrlRenderer
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v <- newEmptyMVar
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let callback a = Just $ a v
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runAssistant d $ do
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startNamedThread urlrenderer $
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webAppThread d urlrenderer True listenhost
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(callback signaler)
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(callback mainthread)
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waitNamedThreads
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where
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signaler v = do
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putMVar v ""
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takeMVar v
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mainthread v url htmlshim
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| isJust listenhost = do
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putStrLn url
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hFlush stdout
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go
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| otherwise = do
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browser <- maybe Nothing webBrowser <$> Git.Config.global
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openBrowser browser htmlshim url Nothing Nothing
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go
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where
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go = do
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_wait <- takeMVar v
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state <- Annex.new =<< Git.CurrentRepo.get
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Annex.eval state $
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startDaemon True True listenhost $ Just $
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sendurlback v
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sendurlback v _origout _origerr url _htmlshim = do
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recordUrl url
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putMVar v url
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recordUrl :: String -> IO ()
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#ifdef __ANDROID__
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{- The Android app has a menu item that opens the url recorded
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- in this file. -}
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recordUrl url = writeFile "/sdcard/git-annex.home/.git-annex-url" url
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#else
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recordUrl _ = noop
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#endif
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openBrowser :: Maybe FilePath -> FilePath -> String -> Maybe Handle -> Maybe Handle -> IO ()
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#ifndef __ANDROID__
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openBrowser mcmd htmlshim _realurl outh errh = runbrowser
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#else
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openBrowser mcmd htmlshim realurl outh errh = do
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recordUrl url
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{- Android's `am` command does not work reliably across the
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- wide range of Android devices. Intead, FIFO should be set to
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- the filename of a fifo that we can write the URL to. -}
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v <- getEnv "FIFO"
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case v of
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Nothing -> runbrowser
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Just f -> void $ forkIO $ do
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fd <- openFd f WriteOnly Nothing defaultFileFlags
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void $ fdWrite fd url
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closeFd fd
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#endif
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where
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p = case mcmd of
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Just cmd -> proc cmd [htmlshim]
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Nothing -> browserProc url
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#ifdef __ANDROID__
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{- Android does not support file:// urls, but neither is
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- the security of the url in the process table important
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- there, so just use the real url. -}
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url = realurl
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#else
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url = fileUrl htmlshim
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#endif
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runbrowser = do
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hPutStrLn (fromMaybe stdout outh) $ "Launching web browser on " ++ url
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hFlush stdout
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environ <- cleanEnvironment
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(_, _, _, pid) <- createProcess p
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{ env = environ
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, std_out = maybe Inherit UseHandle outh
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, std_err = maybe Inherit UseHandle errh
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}
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exitcode <- waitForProcess pid
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unless (exitcode == ExitSuccess) $ do
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hPutStrLn (fromMaybe stderr errh) "failed to start web browser"
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{- web.browser is a generic git config setting for a web browser program -}
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webBrowser :: Git.Repo -> Maybe FilePath
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webBrowser = Git.Config.getMaybe "web.browser"
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fileUrl :: FilePath -> String
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fileUrl file = "file://" ++ file
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