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|
{- git-annex webapp launcher
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Command.WebApp where
import Common.Annex
import Command
import Assistant
import Assistant.Common
import Assistant.NamedThread
import Assistant.Threads.WebApp
import Assistant.WebApp
import Assistant.Install
import Annex.Environment
import Utility.WebApp
import Utility.Daemon (checkDaemon)
#ifdef __ANDROID__
import Utility.Env
#endif
import Init
import qualified Git
import qualified Git.Config
import qualified Git.CurrentRepo
import qualified Annex
import Config.Files
import qualified Option
import Upgrade
import Annex.Version
import Control.Concurrent
import Control.Concurrent.STM
import System.Process (env, std_out, std_err)
import Network.Socket (HostName)
import System.Environment (getArgs)
def :: [Command]
def = [ withOptions [listenOption] $
noCommit $ noRepo startNoRepo $ dontCheck repoExists $ notBareRepo $
command "webapp" paramNothing seek SectionCommon "launch webapp"]
listenOption :: Option
listenOption = Option.field [] "listen" paramAddress
"accept connections to this address"
seek :: [CommandSeek]
seek = [withField listenOption return $ \listenhost ->
withNothing $ start listenhost]
start :: Maybe HostName -> CommandStart
start = start' True
start' :: Bool -> Maybe HostName -> CommandStart
start' allowauto listenhost = do
liftIO ensureInstalled
ifM isInitialized
( go
, auto
)
stop
where
go = do
cannotrun <- needsUpgrade . fromMaybe (error "no version") =<< getVersion
browser <- fromRepo webBrowser
f <- liftIO . absPath =<< fromRepo gitAnnexHtmlShim
ifM (checkpid <&&> checkshim f)
( if isJust listenhost
then error "The assistant is already running, so --listen cannot be used."
else do
url <- liftIO . readFile
=<< fromRepo gitAnnexUrlFile
liftIO $ openBrowser browser f url Nothing Nothing
, startDaemon True True Nothing cannotrun listenhost $ Just $
\origout origerr url htmlshim ->
if isJust listenhost
then maybe noop (`hPutStrLn` url) origout
else openBrowser browser htmlshim url origout origerr
)
auto
| allowauto = liftIO startNoRepo
| otherwise = do
d <- liftIO getCurrentDirectory
error $ "no git repository in " ++ d
checkpid = do
pidfile <- fromRepo gitAnnexPidFile
liftIO $ isJust <$> checkDaemon pidfile
checkshim f = liftIO $ doesFileExist f
{- When run without a repo, start the first available listed repository in
- the autostart file. If not, it's our first time being run! -}
startNoRepo :: IO ()
startNoRepo = do
-- FIXME should be able to reuse regular getopt, but
-- it currently runs in the Annex monad.
args <- getArgs
let listenhost = headMaybe $ map (snd . separate (== '=')) $
filter ("--listen=" `isPrefixOf`) args
dirs <- liftIO $ filterM doesDirectoryExist =<< readAutoStartFile
case dirs of
[] -> firstRun listenhost
(d:_) -> do
setCurrentDirectory d
state <- Annex.new =<< Git.CurrentRepo.get
void $ Annex.eval state $ doCommand $
start' False listenhost
{- Run the webapp without a repository, which prompts the user, makes one,
- changes to it, starts the regular assistant, and redirects the
- browser to its url.
-
- This is a very tricky dance -- The first webapp calls the signaler,
- which signals the main thread when it's ok to continue by writing to a
- MVar. The main thread starts the second webapp, and uses its callback
- to write its url back to the MVar, from where the signaler retrieves it,
- returning it to the first webapp, which does the redirect.
-
- Note that it's important that mainthread never terminates! Much
- of this complication is due to needing to keep the mainthread running.
-}
firstRun :: Maybe HostName -> IO ()
firstRun listenhost = do
checkEnvironmentIO
{- Without a repository, we cannot have an Annex monad, so cannot
- get a ThreadState. Using undefined is only safe because the
- webapp checks its noAnnex field before accessing the
- threadstate. -}
let st = undefined
{- Get a DaemonStatus without running in the Annex monad. -}
dstatus <- atomically . newTMVar =<< newDaemonStatus
d <- newAssistantData st dstatus
urlrenderer <- newUrlRenderer
v <- newEmptyMVar
let callback a = Just $ a v
runAssistant d $ do
startNamedThread urlrenderer $
webAppThread d urlrenderer True Nothing listenhost
(callback signaler)
(callback mainthread)
waitNamedThreads
where
signaler v = do
putMVar v ""
takeMVar v
mainthread v url htmlshim
| isJust listenhost = do
putStrLn url
hFlush stdout
go
| otherwise = do
browser <- maybe Nothing webBrowser <$> Git.Config.global
openBrowser browser htmlshim url Nothing Nothing
go
where
go = do
_wait <- takeMVar v
state <- Annex.new =<< Git.CurrentRepo.get
Annex.eval state $
startDaemon True True Nothing Nothing listenhost $ Just $
sendurlback v
sendurlback v _origout _origerr url _htmlshim = do
recordUrl url
putMVar v url
recordUrl :: String -> IO ()
#ifdef __ANDROID__
{- The Android app has a menu item that opens the url recorded
- in this file. -}
recordUrl url = writeFile "/sdcard/git-annex.home/.git-annex-url" url
#else
recordUrl _ = noop
#endif
openBrowser :: Maybe FilePath -> FilePath -> String -> Maybe Handle -> Maybe Handle -> IO ()
#ifndef __ANDROID__
openBrowser mcmd htmlshim _realurl outh errh = runbrowser
#else
openBrowser mcmd htmlshim realurl outh errh = do
recordUrl url
{- Android's `am` command does not work reliably across the
- wide range of Android devices. Intead, FIFO should be set to
- the filename of a fifo that we can write the URL to. -}
v <- getEnv "FIFO"
case v of
Nothing -> runbrowser
Just f -> void $ forkIO $ do
fd <- openFd f WriteOnly Nothing defaultFileFlags
void $ fdWrite fd url
closeFd fd
#endif
where
p = case mcmd of
Just cmd -> proc cmd [htmlshim]
Nothing -> browserProc url
#ifdef __ANDROID__
{- Android does not support file:// urls, but neither is
- the security of the url in the process table important
- there, so just use the real url. -}
url = realurl
#else
url = fileUrl htmlshim
#endif
runbrowser = do
hPutStrLn (fromMaybe stdout outh) $ "Launching web browser on " ++ url
hFlush stdout
environ <- cleanEnvironment
(_, _, _, pid) <- createProcess p
{ env = environ
, std_out = maybe Inherit UseHandle outh
, std_err = maybe Inherit UseHandle errh
}
exitcode <- waitForProcess pid
unless (exitcode == ExitSuccess) $
hPutStrLn (fromMaybe stderr errh) "failed to start web browser"
{- web.browser is a generic git config setting for a web browser program -}
webBrowser :: Git.Repo -> Maybe FilePath
webBrowser = Git.Config.getMaybe "web.browser"
fileUrl :: FilePath -> String
fileUrl file = "file://" ++ file
|
