diff options
Diffstat (limited to 'Utility/FileMode.hs')
| -rw-r--r-- | Utility/FileMode.hs | 44 |
1 files changed, 27 insertions, 17 deletions
diff --git a/Utility/FileMode.hs b/Utility/FileMode.hs index 832250b..efef5fa 100644 --- a/Utility/FileMode.hs +++ b/Utility/FileMode.hs @@ -1,13 +1,16 @@ {- File mode utilities. - - - Copyright 2010-2012 Joey Hess <joey@kitenet.net> + - Copyright 2010-2012 Joey Hess <id@joeyh.name> - - License: BSD-2-clause -} {-# LANGUAGE CPP #-} -module Utility.FileMode where +module Utility.FileMode ( + module Utility.FileMode, + FileMode, +) where import System.IO import Control.Monad @@ -17,12 +20,15 @@ import Utility.PosixFiles import System.Posix.Files #endif import Foreign (complement) +import Control.Monad.IO.Class (liftIO, MonadIO) +import Control.Monad.Catch import Utility.Exception {- Applies a conversion function to a file's mode. -} modifyFileMode :: FilePath -> (FileMode -> FileMode) -> IO () modifyFileMode f convert = void $ modifyFileMode' f convert + modifyFileMode' :: FilePath -> (FileMode -> FileMode) -> IO FileMode modifyFileMode' f convert = do s <- getFileStatus f @@ -32,6 +38,14 @@ modifyFileMode' f convert = do setFileMode f new return old +{- Runs an action after changing a file's mode, then restores the old mode. -} +withModifiedFileMode :: FilePath -> (FileMode -> FileMode) -> IO a -> IO a +withModifiedFileMode file convert a = bracket setup cleanup go + where + setup = modifyFileMode' file convert + cleanup oldmode = modifyFileMode file (const oldmode) + go _ = a + {- Adds the specified FileModes to the input mode, leaving the rest - unchanged. -} addModes :: [FileMode] -> FileMode -> FileMode @@ -41,14 +55,6 @@ addModes ms m = combineModes (m:ms) removeModes :: [FileMode] -> FileMode -> FileMode removeModes ms m = m `intersectFileModes` complement (combineModes ms) -{- Runs an action after changing a file's mode, then restores the old mode. -} -withModifiedFileMode :: FilePath -> (FileMode -> FileMode) -> IO a -> IO a -withModifiedFileMode file convert a = bracket setup cleanup go - where - setup = modifyFileMode' file convert - cleanup oldmode = modifyFileMode file (const oldmode) - go _ = a - writeModes :: [FileMode] writeModes = [ownerWriteMode, groupWriteMode, otherWriteMode] @@ -103,7 +109,7 @@ isExecutable mode = combineModes executeModes `intersectFileModes` mode /= 0 {- Runs an action without that pesky umask influencing it, unless the - passed FileMode is the standard one. -} -noUmask :: FileMode -> IO a -> IO a +noUmask :: (MonadIO m, MonadMask m) => FileMode -> m a -> m a #ifndef mingw32_HOST_OS noUmask mode a | mode == stdFileMode = a @@ -112,19 +118,19 @@ noUmask mode a noUmask _ a = a #endif -withUmask :: FileMode -> IO a -> IO a +withUmask :: (MonadIO m, MonadMask m) => FileMode -> m a -> m a #ifndef mingw32_HOST_OS withUmask umask a = bracket setup cleanup go where - setup = setFileCreationMask umask - cleanup = setFileCreationMask + setup = liftIO $ setFileCreationMask umask + cleanup = liftIO . setFileCreationMask go _ = a #else withUmask _ a = a #endif combineModes :: [FileMode] -> FileMode -combineModes [] = undefined +combineModes [] = 0 combineModes [m] = m combineModes (m:ms) = foldl unionFileModes m ms @@ -151,7 +157,11 @@ setSticky f = modifyFileMode f $ addModes [stickyMode] - as writeFile. -} writeFileProtected :: FilePath -> String -> IO () -writeFileProtected file content = withUmask 0o0077 $ +writeFileProtected file content = writeFileProtected' file + (\h -> hPutStr h content) + +writeFileProtected' :: FilePath -> (Handle -> IO ()) -> IO () +writeFileProtected' file writer = withUmask 0o0077 $ withFile file WriteMode $ \h -> do void $ tryIO $ modifyFileMode file $ removeModes otherGroupModes - hPutStr h content + writer h |