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|
{- moving files
-
- Copyright 2011-2020 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE LambdaCase #-}
{-# OPTIONS_GHC -fno-warn-tabs #-}
module Utility.MoveFile (
moveFile,
) where
import Control.Monad
import System.IO.Error
import Prelude
#ifndef mingw32_HOST_OS
import System.PosixCompat.Files (isDirectory)
import Control.Monad.IfElse
import Utility.SafeCommand
#endif
import Utility.SystemDirectory
import Utility.Tmp
import Utility.Exception
import Utility.Monad
import Utility.FileSystemEncoding
import qualified Utility.RawFilePath as R
{- Moves one filename to another.
- First tries a rename, but falls back to moving across devices if needed. -}
moveFile :: RawFilePath -> RawFilePath -> IO ()
moveFile src dest = tryIO (R.rename src dest) >>= onrename
where
onrename (Right _) = noop
onrename (Left e)
| isPermissionError e = rethrow
| isDoesNotExistError e = rethrow
| otherwise = viaTmp mv (fromRawFilePath dest) ()
where
rethrow = throwM e
mv tmp () = do
-- copyFile is likely not as optimised as
-- the mv command, so we'll use the command.
--
-- But, while Windows has a "mv", it does not
-- seem very reliable, so use copyFile there.
#ifndef mingw32_HOST_OS
-- If dest is a directory, mv would move the file
-- into it, which is not desired.
whenM (isdir dest) rethrow
ok <- boolSystem "mv"
[ Param "-f"
, Param (fromRawFilePath src)
, Param tmp
]
let e' = e
#else
r <- tryIO $ copyFile (fromRawFilePath src) tmp
let (ok, e') = case r of
Left err -> (False, err)
Right _ -> (True, e)
#endif
unless ok $ do
-- delete any partial
_ <- tryIO $ removeFile tmp
throwM e'
#ifndef mingw32_HOST_OS
isdir f = do
r <- tryIO $ R.getSymbolicLinkStatus f
case r of
(Left _) -> return False
(Right s) -> return $ isDirectory s
#endif
|
