72 lines
2.1 KiB
Haskell
72 lines
2.1 KiB
Haskell
{- 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 AGPL version 3 or higher.
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-}
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{-# LANGUAGE QuasiQuotes, TemplateHaskell, OverloadedStrings #-}
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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 Assistant.WebApp.Page
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import qualified Git.Construct
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import qualified Git.Config
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import Config.Files
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import qualified Utility.Url as Url
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import Utility.Yesod
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import Control.Concurrent
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import System.Process (cwd)
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getRepositorySwitcherR :: Handler Html
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getRepositorySwitcherR = page "Switch repository" Nothing $ do
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repolist <- liftIO listOtherRepos
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$(widgetFile "control/repositoryswitcher")
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listOtherRepos :: IO [(String, String)]
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listOtherRepos = do
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dirs <- readAutoStartFile
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pwd <- getCurrentDirectory
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gooddirs <- filterM doesDirectoryExist $
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filter (\d -> not $ d `dirContains` pwd) dirs
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names <- mapM relHome gooddirs
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return $ sort $ zip names gooddirs
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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 Html
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getSwitchToRepositoryR repo = do
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liftIO $ startAssistant repo
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liftIO $ addAutoStartFile repo -- make this the new default repo
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redirect =<< liftIO geturl
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where
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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 $ fst <$> Url.exists url [] Nothing
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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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{- Returns once the assistant has daemonized, but possibly before it's
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- listening for web connections. -}
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startAssistant :: FilePath -> IO ()
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startAssistant repo = do
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program <- readProgramFile
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(_, _, _, pid) <-
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createProcess $
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(proc program ["assistant"]) { cwd = Just repo }
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void $ checkSuccessProcess pid
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