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