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{- Temporary directories
-
- Copyright 2010-2013 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
{-# LANGUAGE CPP #-}
{-# OPTIONS_GHC -fno-warn-tabs #-}
module Utility.Tmp.Dir (
withTmpDir,
withTmpDirIn,
) where
import Control.Monad.IfElse
import System.FilePath
import System.Directory
import Control.Monad.IO.Class
#ifndef mingw32_HOST_OS
import System.Posix.Temp (mkdtemp)
#endif
import Utility.Exception
import Utility.Tmp (Template)
{- Runs an action with a tmp directory located within the system's tmp
- directory (or within "." if there is none), then removes the tmp
- directory and all its contents. -}
withTmpDir :: (MonadMask m, MonadIO m) => Template -> (FilePath -> m a) -> m a
withTmpDir template a = do
topleveltmpdir <- liftIO $ catchDefaultIO "." getTemporaryDirectory
#ifndef mingw32_HOST_OS
-- Use mkdtemp to create a temp directory securely in /tmp.
bracket
(liftIO $ mkdtemp $ topleveltmpdir </> template)
removeTmpDir
a
#else
withTmpDirIn topleveltmpdir template a
#endif
{- Runs an action with a tmp directory located within a specified directory,
- then removes the tmp directory and all its contents. -}
withTmpDirIn :: (MonadMask m, MonadIO m) => FilePath -> Template -> (FilePath -> m a) -> m a
withTmpDirIn tmpdir template = bracketIO create removeTmpDir
where
create = do
createDirectoryIfMissing True tmpdir
makenewdir (tmpdir </> template) (0 :: Int)
makenewdir t n = do
let dir = t ++ "." ++ show n
catchIOErrorType AlreadyExists (const $ makenewdir t $ n + 1) $ do
createDirectory dir
return dir
{- Deletes the entire contents of the the temporary directory, if it
- exists. -}
removeTmpDir :: MonadIO m => FilePath -> m ()
removeTmpDir tmpdir = liftIO $ whenM (doesDirectoryExist tmpdir) $ do
#if mingw32_HOST_OS
-- Windows will often refuse to delete a file
-- after a process has just written to it and exited.
-- Because it's crap, presumably. So, ignore failure
-- to delete the temp directory.
_ <- tryIO $ removeDirectoryRecursive tmpdir
return ()
#else
removeDirectoryRecursive tmpdir
#endif
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