ghcup-hs/lib/GHCup/Utils/File/Windows.hs

203 lines
7.3 KiB
Haskell

{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE FlexibleContexts #-}
{-|
Module : GHCup.Utils.File.Windows
Description : File and windows APIs
Copyright : (c) Julian Ospald, 2020
License : LGPL-3.0
Maintainer : hasufell@hasufell.de
Stability : experimental
Portability : Windows
This module handles file and executable handling.
Some of these functions use sophisticated logging.
-}
module GHCup.Utils.File.Windows where
import GHCup.Utils.File.Common
import GHCup.Types
import Control.Concurrent
import Control.DeepSeq
import Control.Exception.Safe
import Control.Monad
import Control.Monad.Reader
import Foreign.C.Error
import GHC.IO.Exception
import GHC.IO.Handle
import System.Directory
import System.FilePath
import System.IO
import System.Process
import qualified Control.Exception as EX
import qualified Data.ByteString as BS
import qualified Data.ByteString.Lazy as BL
toProcessError :: FilePath
-> [FilePath]
-> ExitCode
-> Either ProcessError ()
toProcessError exe args exitcode = case exitcode of
(ExitFailure xi) -> Left $ NonZeroExit xi exe args
ExitSuccess -> Right ()
-- | @readCreateProcessWithExitCode@ works exactly like 'readProcessWithExitCode' except that it
-- lets you pass 'CreateProcess' giving better flexibility.
--
-- Note that @Handle@s provided for @std_in@, @std_out@, or @std_err@ via the CreateProcess
-- record will be ignored.
--
-- @since 1.2.3.0
readCreateProcessWithExitCodeBS
:: CreateProcess
-> BL.ByteString
-> IO (ExitCode, BL.ByteString, BL.ByteString) -- ^ exitcode, stdout, stderr
readCreateProcessWithExitCodeBS cp input = do
let cp_opts = cp {
std_in = CreatePipe,
std_out = CreatePipe,
std_err = CreatePipe
}
withCreateProcess_ "readCreateProcessWithExitCode" cp_opts $
\mb_inh mb_outh mb_errh ph ->
case (mb_inh, mb_outh, mb_errh) of
(Just inh, Just outh, Just errh) -> do
out <- BS.hGetContents outh
err <- BS.hGetContents errh
-- fork off threads to start consuming stdout & stderr
withForkWait (EX.evaluate $ rnf out) $ \waitOut ->
withForkWait (EX.evaluate $ rnf err) $ \waitErr -> do
-- now write any input
unless (BL.null input) $
ignoreSigPipe $ BL.hPut inh input
-- hClose performs implicit hFlush, and thus may trigger a SIGPIPE
ignoreSigPipe $ hClose inh
-- wait on the output
waitOut
waitErr
hClose outh
hClose errh
-- wait on the process
ex <- waitForProcess ph
return (ex, BL.fromStrict out, BL.fromStrict err)
(Nothing,_,_) -> error "readCreateProcessWithExitCodeBS: Failed to get a stdin handle."
(_,Nothing,_) -> error "readCreateProcessWithExitCodeBS: Failed to get a stdout handle."
(_,_,Nothing) -> error "readCreateProcessWithExitCodeBS: Failed to get a stderr handle."
where
ignoreSigPipe :: IO () -> IO ()
ignoreSigPipe = EX.handle $ \e -> case e of
IOError { ioe_type = ResourceVanished
, ioe_errno = Just ioe }
| Errno ioe == ePIPE -> return ()
_ -> throwIO e
-- wrapper so we can get exceptions with the appropriate function name.
withCreateProcess_
:: String
-> CreateProcess
-> (Maybe Handle -> Maybe Handle -> Maybe Handle -> ProcessHandle -> IO a)
-> IO a
withCreateProcess_ fun c action =
EX.bracketOnError (createProcess_ fun c) cleanupProcess
(\(m_in, m_out, m_err, ph) -> action m_in m_out m_err ph)
-- | Fork a thread while doing something else, but kill it if there's an
-- exception.
--
-- This is important in the cases above because we want to kill the thread
-- that is holding the Handle lock, because when we clean up the process we
-- try to close that handle, which could otherwise deadlock.
--
withForkWait :: IO () -> (IO () -> IO a) -> IO a
withForkWait async' body = do
waitVar <- newEmptyMVar :: IO (MVar (Either SomeException ()))
mask $ \restore -> do
tid <- forkIO $ try (restore async') >>= putMVar waitVar
let wait' = takeMVar waitVar >>= either throwIO return
restore (body wait') `EX.onException` killThread tid
-- | Execute the given command and collect the stdout, stderr and the exit code.
-- The command is run in a subprocess.
executeOut :: FilePath -- ^ command as filename, e.g. 'ls'
-> [String] -- ^ arguments to the command
-> Maybe FilePath -- ^ chdir to this path
-> IO CapturedProcess
executeOut path args chdir = do
(exit, out, err) <- readCreateProcessWithExitCodeBS (proc path args){ cwd = chdir } ""
pure $ CapturedProcess exit out err
execLogged :: (MonadReader AppState m, MonadIO m, MonadThrow m)
=> FilePath -- ^ thing to execute
-> [String] -- ^ args for the thing
-> Maybe FilePath -- ^ optionally chdir into this
-> FilePath -- ^ log filename (opened in append mode)
-> Maybe [(String, String)] -- ^ optional environment
-> m (Either ProcessError ())
execLogged exe args chdir lfile env = do
AppState { dirs = Dirs {..} } <- ask
let stdoutLogfile = logsDir </> lfile <> ".stdout.log"
stderrLogfile = logsDir </> lfile <> ".stderr.log"
fmap (toProcessError exe args)
$ liftIO
$ withCreateProcess
(proc exe args){ cwd = chdir
, env = env
, std_in = CreatePipe
, std_out = CreatePipe
, std_err = CreatePipe
}
$ \_ mout merr ph ->
case (mout, merr) of
(Just cStdout, Just cStderr) -> do
withForkWait (tee stdoutLogfile cStdout) $ \waitOut ->
withForkWait (tee stderrLogfile cStderr) $ \waitErr -> do
waitOut
waitErr
waitForProcess ph
_ -> fail "Could not acquire out/err handle"
where
tee :: FilePath -> Handle -> IO ()
tee logFile handle' = go
where
go = do
some <- BS.hGetSome handle' 512
if BS.null some
then pure ()
else do
void $ BS.appendFile logFile some
void $ BS.hPut stdout some
go
-- | Thin wrapper around `executeFile`.
exec :: FilePath -- ^ thing to execute
-> [FilePath] -- ^ args for the thing
-> Maybe FilePath -- ^ optionally chdir into this
-> Maybe [(String, String)] -- ^ optional environment
-> IO (Either ProcessError ())
exec exe args chdir env = do
exit_code <- withCreateProcess
(proc exe args) { cwd = chdir, env = env } $ \_ _ _ p ->
waitForProcess p
pure $ toProcessError exe args exit_code
chmod_755 :: MonadIO m => FilePath -> m ()
chmod_755 fp =
let perm = setOwnerWritable True emptyPermissions
in liftIO $ setPermissions fp perm