80 lines
2.5 KiB
Haskell
80 lines
2.5 KiB
Haskell
{-# LANGUAGE ScopedTypeVariables #-}
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--------------------------------------------------------------------------------
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-- | Start a VirtualBox instance with a sentinel wrapper process.
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--
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-- The only reason why this is needed is because I want to manage virtualboxes
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-- in their own dynamic workspaces, which are currently set up to correspond to
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-- one process. The problem with Virtualbox is that the VBoxManage command
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-- spawns a new VM and then exits, which means the process that was originally
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-- attached to the dynamic workspace only exists for a few seconds when the VM
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-- is starting.
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--
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-- Solution: Run VBoxManage in a wrapper binary that launches the VM and sleeps
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-- until its PID exits. By monitoring this wrapper, the dynamic workspace only
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-- has one process to track and will maintain the workspace throughout the
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-- lifetime of the VM.
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module Main (main) where
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import Control.Exception
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import Data.List
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import qualified RIO.Text as T
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import Text.Read
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import Text.XML.Light
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import System.Environment
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import System.Exit
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import XMonad.Internal.Concurrent.VirtualBox
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import XMonad.Internal.Process
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main :: IO ()
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main = runAndWait =<< getArgs
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runAndWait :: [String] -> IO ()
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runAndWait [n] = either (putStrLn . T.unpack) runConfig =<< vmInstanceConfig (T.pack n)
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where
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runConfig c = maybe err runID =<< vmMachineID c
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runID i = do
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vmLaunch i
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p <- vmPID i
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waitUntilExit p
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err = putStrLn "Could not get machine ID"
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runAndWait _ = putStrLn "Usage: vbox-start VBOXNAME"
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vmLaunch :: String -> IO ()
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vmLaunch i = do
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(rc, _, _) <- readCreateProcessWithExitCode' cmd ""
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case rc of
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ExitSuccess -> return ()
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_ -> putStrLn $ "Failed to start VM: " ++ i
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where
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cmd = proc "VBoxManage" ["startvm", i]
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vmPID :: String -> IO (Maybe Int)
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vmPID vid = do
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(rc, out, _) <- readCreateProcessWithExitCode' cmd ""
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return $ case rc of
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ExitSuccess -> readMaybe out
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_ -> Nothing
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where
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cmd = proc "pgrep" ["-f", "VirtualBoxVM.*" ++ vid]
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vmMachineID :: FilePath -> IO (Maybe String)
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vmMachineID iPath = do
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(s :: Either IOException String) <- try $ readFile iPath
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return $ case s of
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(Left _) -> Nothing
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(Right x) -> findMachineID =<< parseXMLDoc x
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where
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findMachineID e = stripPrefix "{"
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=<< (fmap reverse . stripPrefix "}" . reverse)
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=<< findAttr (blank_name { qName = "uuid" })
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=<< findChild (qual e "Machine") e
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