git-annex/Utility/Tmp/Dir.hs
Joey Hess 25703e1413
finally really add back custom-setup stanza
Fourth or fifth try at this and finally found a way to make it work.

Absurd amount of busy-work forced on me by change in cabal's behavior.
Split up Utility modules that need posix stuff out of ones used by
Setup. Various other hacks around inability for Setup to use anything
that ifdefs a use of unix.

Probably lost a full day of my life to this.
This is how build systems make their users hate them. Just saying.
2017-12-31 16:36:39 -04:00

68 lines
2 KiB
Haskell

{- Temporary directorie
-
- Copyright 2010-2013 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
{-# LANGUAGE CPP #-}
{-# OPTIONS_GHC -fno-warn-tabs #-}
module Utility.Tmp.Dir 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
type Template = String
{- 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