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{- File mode utilities.
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Utility.FileMode where
import System.Posix.Files
import System.Posix.Types
import Foreign (complement)
{- Removes a FileMode from a file.
- For example, call with otherWriteMode to chmod o-w -}
unsetFileMode :: FilePath -> FileMode -> IO ()
unsetFileMode f m = do
s <- getFileStatus f
setFileMode f $ fileMode s `intersectFileModes` complement m
{- Removes the write bits from a file. -}
preventWrite :: FilePath -> IO ()
preventWrite f = unsetFileMode f writebits
where
writebits = foldl unionFileModes ownerWriteMode
[groupWriteMode, otherWriteMode]
{- Turns a file's write bit back on. -}
allowWrite :: FilePath -> IO ()
allowWrite f = do
s <- getFileStatus f
setFileMode f $ fileMode s `unionFileModes` ownerWriteMode
{- Checks if a file mode indicates it's a symlink. -}
isSymLink :: FileMode -> Bool
isSymLink mode = symbolicLinkMode `intersectFileModes` mode == symbolicLinkMode
{- Checks if a file has any executable bits set. -}
isExecutable :: FileMode -> Bool
isExecutable mode = ebits `intersectFileModes` mode /= 0
where
ebits = ownerExecuteMode `unionFileModes`
groupExecuteMode `unionFileModes` otherExecuteMode
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