e213ef310f
* Fix minor FD leak in journal code. Closes: #754608 * direct: Fix handling of case where a work tree subdirectory cannot be written to due to permissions. * migrate: Avoid re-checksumming when migrating from hashE to hash backend. * uninit: Avoid failing final removal in some direct mode repositories due to file modes. * S3: Deal with AWS ACL configurations that do not allow creating or checking the location of a bucket, but only reading and writing content to it. * resolvemerge: New plumbing command that runs the automatic merge conflict resolver. * Deal with change in git 2.0 that made indirect mode merge conflict resolution leave behind old files. * sync: Fix git sync with local git remotes even when they don't have an annex.uuid set. (The assistant already did so.) * Set gcrypt-publish-participants when setting up a gcrypt repository, to avoid unncessary passphrase prompts. This is a security/usability tradeoff. To avoid exposing the gpg key ids who can decrypt the repository, users can unset gcrypt-publish-participants. * Install nautilus hooks even when ~/.local/share/nautilus/ does not yet exist, since it is not automatically created for Gnome 3 users. * Windows: Move .vbs files out of git\bin, to avoid that being in the PATH, which caused some weird breakage. (Thanks, divB) * Windows: Fix locking issue that prevented the webapp starting (since 5.20140707). # imported from the archive
85 lines
2.8 KiB
Haskell
85 lines
2.8 KiB
Haskell
{- DBus utilities
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- License: BSD-2-clause
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-}
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{-# LANGUAGE OverloadedStrings, ScopedTypeVariables #-}
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module Utility.DBus where
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import Utility.PartialPrelude
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import Utility.Exception
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import DBus.Client
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import DBus
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import Data.Maybe
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import Control.Concurrent
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import Control.Exception as E
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type ServiceName = String
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listServiceNames :: Client -> IO [ServiceName]
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listServiceNames client = do
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reply <- callDBus client "ListNames" []
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return $ fromMaybe [] $ fromVariant =<< headMaybe (methodReturnBody reply)
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callDBus :: Client -> MemberName -> [Variant] -> IO MethodReturn
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callDBus client name params = call_ client $
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(methodCall "/org/freedesktop/DBus" "org.freedesktop.DBus" name)
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{ methodCallDestination = Just "org.freedesktop.DBus"
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, methodCallBody = params
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}
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{- Connects to the bus, and runs the client action.
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-
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- Throws a ClientError, and closes the connection if it fails to
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- process an incoming message, or if the connection is lost.
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- Unlike DBus's usual interface, this error is thrown at the top level,
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- rather than inside the clientThreadRunner, so it can be caught, and
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- runClient re-run as needed. -}
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runClient :: IO (Maybe Address) -> (Client -> IO ()) -> IO ()
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runClient getaddr clientaction = do
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env <- getaddr
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case env of
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Nothing -> throwIO (clientError "runClient: unable to determine DBUS address")
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Just addr -> do
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{- The clientaction will set up listeners, which
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- run in a different thread. We block while
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- they're running, until our threadrunner catches
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- a ClientError, which it will put into the MVar
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- to be rethrown here. -}
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mv <- newEmptyMVar
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let tr = threadrunner (putMVar mv)
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let opts = defaultClientOptions { clientThreadRunner = tr }
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client <- connectWith opts addr
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clientaction client
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e <- takeMVar mv
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disconnect client
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throw e
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where
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threadrunner storeerr io = loop
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where
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loop = catchClientError (io >> loop) storeerr
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{- Connects to the bus, and runs the client action.
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-
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- If the connection is lost, runs onretry, which can do something like
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- a delay, or printing a warning, and has a state value (useful for
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- exponential backoff). Once onretry returns, the connection is retried.
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-}
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persistentClient :: IO (Maybe Address) -> v -> (SomeException -> v -> IO v) -> (Client -> IO ()) -> IO ()
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persistentClient getaddr v onretry clientaction =
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{- runClient can fail with not just ClientError, but also other
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- things, if dbus is not running. Let async exceptions through. -}
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runClient getaddr clientaction `catchNonAsync` retry
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where
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retry e = do
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v' <- onretry e v
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persistentClient getaddr v' onretry clientaction
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{- Catches only ClientError -}
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catchClientError :: IO () -> (ClientError -> IO ()) -> IO ()
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catchClientError io handler =
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either handler return =<< (E.try io :: IO (Either ClientError ()))
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