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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 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
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 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 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 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) $ do
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
|
