54 lines
1.5 KiB
Haskell
54 lines
1.5 KiB
Haskell
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{- git-annex assistant webapp switching to other repos
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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, TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes #-}
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module Assistant.WebApp.OtherRepos where
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import Assistant.Common
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import Assistant.WebApp.Types
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import qualified Git.Construct
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import qualified Git.Config
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import Locations.UserConfig
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import qualified Utility.Url as Url
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import Yesod
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import Control.Concurrent
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import System.Process (cwd)
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{- Starts up the assistant in the repository, and waits for it to create
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- a gitAnnexUrlFile. Waits for the assistant to be up and listening for
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- connections by testing the url. Once it's running, redirect to it.
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-}
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getSwitchToRepositoryR :: FilePath -> Handler RepHtml
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getSwitchToRepositoryR repo = do
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liftIO startassistant
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url <- liftIO geturl
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redirect url
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where
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startassistant = do
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program <- readProgramFile
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void $ forkIO $ void $ createProcess $
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(proc program ["assistant"])
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{ cwd = Just repo }
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geturl = do
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r <- Git.Config.read =<< Git.Construct.fromPath repo
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waiturl $ gitAnnexUrlFile r
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waiturl urlfile = do
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v <- tryIO $ readFile urlfile
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case v of
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Left _ -> delayed $ waiturl urlfile
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Right url -> ifM (listening url)
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( return url
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, delayed $ waiturl urlfile
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)
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listening url = catchBoolIO $
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fst <$> Url.exists url []
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delayed a = do
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threadDelay 100000 -- 1/10th of a second
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a
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