52 lines
1.3 KiB
Haskell
52 lines
1.3 KiB
Haskell
|
{- directory manipulation
|
||
|
|
-
|
||
|
|
- Copyright 2011 Joey Hess <joey@kitenet.net>
|
||
|
|
-
|
||
|
|
- Licensed under the GNU GPL version 3 or higher.
|
||
|
|
-}
|
||
|
|
|
||
|
|
module Utility.Directory where
|
||
|
|
|
||
|
|
import System.IO.Error
|
||
|
|
import System.Posix.Files
|
||
|
|
import System.Directory
|
||
|
|
import Control.Exception (throw)
|
||
|
|
|
||
|
|
import Utility.SafeCommand
|
||
|
|
import Utility.Conditional
|
||
|
|
import Utility.TempFile
|
||
|
|
|
||
|
|
{- Moves one filename to another.
|
||
|
|
- First tries a rename, but falls back to moving across devices if needed. -}
|
||
|
|
moveFile :: FilePath -> FilePath -> IO ()
|
||
|
|
moveFile src dest = try (rename src dest) >>= onrename
|
||
|
|
where
|
||
|
|
onrename (Right _) = return ()
|
||
|
|
onrename (Left e)
|
||
|
|
| isPermissionError e = rethrow
|
||
|
|
| isDoesNotExistError e = rethrow
|
||
|
|
| otherwise = do
|
||
|
|
-- copyFile is likely not as optimised as
|
||
|
|
-- the mv command, so we'll use the latter.
|
||
|
|
-- But, mv will move into a directory if
|
||
|
|
-- dest is one, which is not desired.
|
||
|
|
whenM (isdir dest) rethrow
|
||
|
|
viaTmp mv dest undefined
|
||
|
|
where
|
||
|
|
rethrow = throw e
|
||
|
|
mv tmp _ = do
|
||
|
|
ok <- boolSystem "mv" [Param "-f",
|
||
|
|
Param src, Param tmp]
|
||
|
|
if ok
|
||
|
|
then return ()
|
||
|
|
else do
|
||
|
|
-- delete any partial
|
||
|
|
_ <- try $
|
||
|
|
removeFile tmp
|
||
|
|
rethrow
|
||
|
|
isdir f = do
|
||
|
|
r <- try (getFileStatus f)
|
||
|
|
case r of
|
||
|
|
(Left _) -> return False
|
||
|
|
(Right s) -> return $ isDirectory s
|