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{- git-annex assistant webapp switching to other repos
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP, TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}
module Assistant.WebApp.OtherRepos where
import Assistant.Common
import Assistant.WebApp.Types
import qualified Git.Construct
import qualified Git.Config
import Locations.UserConfig
import qualified Utility.Url as Url
import Yesod
import Control.Concurrent
import System.Process (cwd)
{- 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. Once it's running, redirect to it.
-}
getSwitchToRepositoryR :: FilePath -> Handler RepHtml
getSwitchToRepositoryR repo = do
liftIO startassistant
url <- liftIO geturl
redirect url
where
startassistant = do
program <- readProgramFile
void $ forkIO $ void $ createProcess $
(proc program ["assistant"])
{ cwd = Just repo }
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 <$> Url.exists url []
delayed a = do
threadDelay 100000 -- 1/10th of a second
a
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