1023 lines
28 KiB
Haskell
1023 lines
28 KiB
Haskell
-- |
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-- Module : HPath.IO
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-- Copyright : © 2016 Julian Ospald
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-- License : BSD3
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--
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-- Maintainer : Julian Ospald <hasufell@posteo.de>
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-- Stability : experimental
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-- Portability : portable
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--
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-- This module provides high-level IO related file operations like
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-- copy, delete, move and so on. It only operates on /Path x/ which
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-- guarantees us well-typed paths. This is a thin wrapper over
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-- System.Posix.RawFilePath.Directory in 'hpath-directory'. It's
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-- encouraged to use this module.
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--
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-- Some of these operations are due to their nature __not atomic__, which
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-- means they may do multiple syscalls which form one context. Some
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-- of them also have to examine the filetypes explicitly before the
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-- syscalls, so a reasonable decision can be made. That means
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-- the result is undefined if another process changes that context
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-- while the non-atomic operation is still happening. However, where
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-- possible, as few syscalls as possible are used and the underlying
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-- exception handling is kept.
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--
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-- Note: `BlockDevice`, `CharacterDevice`, `NamedPipe` and `Socket`
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-- are ignored by some of the more high-level functions (like `easyCopy`).
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-- For other functions (like `copyFile`), the behavior on these file types is
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-- unreliable/unsafe. Check the documentation of those functions for details.
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{-# LANGUAGE CPP #-}
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{-# LANGUAGE PackageImports #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE FlexibleContexts #-}
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module HPath.IO
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(
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-- * Types
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FileType(..)
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, RecursiveErrorMode(..)
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, CopyMode(..)
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-- * File copying
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, copyDirRecursive
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, recreateSymlink
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, copyFile
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, easyCopy
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-- * File deletion
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, deleteFile
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, deleteDir
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, deleteDirRecursive
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, easyDelete
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-- * File opening
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, openFile
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, executeFile
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-- * File creation
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, createRegularFile
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, createDir
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, createDirIfMissing
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, createDirRecursive
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, createSymlink
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-- * File renaming/moving
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, renameFile
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, moveFile
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-- * File reading
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, readFile
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, readFileStream
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-- * File writing
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, writeFile
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, writeFileL
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, appendFile
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-- * File permissions
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, newFilePerms
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, newDirPerms
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-- * File checks
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, doesExist
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, doesFileExist
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, doesDirectoryExist
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, isReadable
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, isWritable
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, isExecutable
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, canOpenDirectory
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-- * File times
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, getModificationTime
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, setModificationTime
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, setModificationTimeHiRes
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-- * Directory reading
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, getDirsFiles
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, getDirsFiles'
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-- * Filetype operations
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, getFileType
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-- * Others
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, canonicalizePath
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, toAbs
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, withRawFilePath
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, withHandle
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, module System.Posix.RawFilePath.Directory.Errors
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)
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where
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import Control.Applicative
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(
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(<$>)
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)
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import Control.Exception.Safe
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(
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IOException
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, bracket
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, bracketOnError
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, throwIO
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, finally
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)
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import Control.Monad
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(
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unless
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, void
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, when
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)
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import Control.Monad.Catch (MonadThrow(..))
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import Control.Monad.IfElse
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(
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unlessM
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)
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import Data.ByteString
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(
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ByteString
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)
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import Data.Traversable ( for )
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import Data.Functor ( ($>) )
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#if MIN_VERSION_bytestring(0,10,2)
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import Data.ByteString.Builder
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#else
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import Data.ByteString.Lazy.Builder
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#endif
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(
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Builder
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, byteString
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, toLazyByteString
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)
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import qualified Data.ByteString.Lazy as L
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import Data.ByteString.Unsafe
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(
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unsafePackCStringFinalizer
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)
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import Data.Foldable
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(
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for_
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)
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import Data.IORef
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(
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IORef
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, modifyIORef
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, newIORef
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, readIORef
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)
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import Data.Maybe
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(
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catMaybes
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)
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import Data.Monoid
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(
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(<>)
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, mempty
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)
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import Data.Time.Clock
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import Data.Time.Clock.POSIX (getPOSIXTime, posixSecondsToUTCTime, POSIXTime)
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import Data.Word
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(
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Word8
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)
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import Foreign.C.Error
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(
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eEXIST
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, eNOENT
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, eNOTEMPTY
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, eXDEV
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, getErrno
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)
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import Foreign.C.Types
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(
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CSize
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)
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import Foreign.Marshal.Alloc
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(
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allocaBytes
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)
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import Foreign.Ptr
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(
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Ptr
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)
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import GHC.IO.Exception
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(
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IOErrorType(..)
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)
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import HPath
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import Prelude hiding (appendFile, readFile, writeFile)
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import Streamly
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import Streamly.External.ByteString
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import qualified Streamly.External.ByteString.Lazy as SL
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import qualified Streamly.Data.Fold as FL
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import Streamly.Memory.Array
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import qualified Streamly.FileSystem.Handle as FH
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import qualified Streamly.Internal.Data.Unfold as SU
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import qualified Streamly.Internal.FileSystem.Handle as IFH
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import qualified Streamly.Internal.Memory.ArrayStream as AS
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import qualified Streamly.Prelude as S
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import qualified System.IO as SIO
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import System.IO.Error
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(
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catchIOError
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, ioeGetErrorType
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)
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import System.Posix.ByteString
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(
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exclusive
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)
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import System.Posix.Directory.ByteString
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(
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createDirectory
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, closeDirStream
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, getWorkingDirectory
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, openDirStream
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, removeDirectory
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)
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import System.Posix.Files.ByteString
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(
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createSymbolicLink
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, fileAccess
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, fileMode
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, getFdStatus
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, groupExecuteMode
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, groupReadMode
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, groupWriteMode
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, otherExecuteMode
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, otherReadMode
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, otherWriteMode
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, ownerModes
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, ownerReadMode
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, ownerWriteMode
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, readSymbolicLink
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, removeLink
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, rename
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, setFileMode
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, unionFileModes
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)
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import qualified System.Posix.FilePath as FP
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import qualified System.Posix.Files.ByteString as PF
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import qualified "unix" System.Posix.IO.ByteString as SPI
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import qualified "unix-bytestring" System.Posix.IO.ByteString as SPB
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import System.Posix.FD
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(
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openFd
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)
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import qualified System.Posix.Process.ByteString as SPP
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import System.Posix.RawFilePath.Directory.Errors
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import System.Posix.Types
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(
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FileMode
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, ProcessID
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, Fd
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, EpochTime
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)
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import System.Posix.Time
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import qualified System.Posix.RawFilePath.Directory as RD
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import System.Posix.RawFilePath.Directory
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(
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FileType
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, RecursiveErrorMode
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, CopyMode
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)
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|
|
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|
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--------------------
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--[ File Copying ]--
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--------------------
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-- |Copies the contents of a directory recursively to the given destination, while preserving permissions.
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-- Does not follow symbolic links. This behaves more or less like
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-- the following, without descending into the destination if it
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-- already exists:
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--
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-- @
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-- cp -a \/source\/dir \/destination\/somedir
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-- @
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--
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-- For directory contents, this will ignore any file type that is not
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-- `RegularFile`, `SymbolicLink` or `Directory`.
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--
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-- For `Overwrite` copy mode this does not prune destination directory
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-- contents, so the destination might contain more files than the source after
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-- the operation has completed. Permissions of existing directories are
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-- fixed.
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--
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-- Safety/reliability concerns:
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--
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-- * not atomic
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-- * examines filetypes explicitly
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-- * an explicit check `throwDestinationInSource` is carried out for the
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-- top directory for basic sanity, because otherwise we might end up
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-- with an infinite copy loop... however, this operation is not
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-- carried out recursively (because it's slow)
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--
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-- Throws:
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--
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-- - `NoSuchThing` if source directory does not exist
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-- - `PermissionDenied` if source directory can't be opened
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-- - `SameFile` if source and destination are the same file
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-- (`HPathIOException`)
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-- - `DestinationInSource` if destination is contained in source
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-- (`HPathIOException`)
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--
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-- Throws in `FailEarly` RecursiveErrorMode only:
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--
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-- - `PermissionDenied` if output directory is not writable
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-- - `InvalidArgument` if source directory is wrong type (symlink)
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-- - `InappropriateType` if source directory is wrong type (regular file)
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--
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-- Throws in `CollectFailures` RecursiveErrorMode only:
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--
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-- - `RecursiveFailure` if any of the recursive operations that are not
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-- part of the top-directory sanity-checks fail (`HPathIOException`)
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--
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-- Throws in `Strict` CopyMode only:
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--
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-- - `AlreadyExists` if destination already exists
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--
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-- Note: may call `getcwd` (only if destination is a relative path)
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copyDirRecursive :: Path b1 -- ^ source dir
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-> Path b2 -- ^ destination (parent dirs
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-- are not automatically created)
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-> CopyMode
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-> RecursiveErrorMode
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-> IO ()
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copyDirRecursive (Path fromp) (Path destdirp) cm rm
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= RD.copyDirRecursive fromp destdirp cm rm
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|
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-- |Recreate a symlink.
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--
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-- In `Overwrite` copy mode only files and empty directories are deleted.
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--
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-- Safety/reliability concerns:
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--
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-- * `Overwrite` mode is inherently non-atomic
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--
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-- Throws:
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--
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-- - `InvalidArgument` if source file is wrong type (not a symlink)
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-- - `PermissionDenied` if output directory cannot be written to
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-- - `PermissionDenied` if source directory cannot be opened
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-- - `SameFile` if source and destination are the same file
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-- (`HPathIOException`)
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--
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--
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-- Throws in `Strict` mode only:
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--
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-- - `AlreadyExists` if destination already exists
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--
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-- Throws in `Overwrite` mode only:
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--
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-- - `UnsatisfiedConstraints` if destination file is non-empty directory
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--
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-- Notes:
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--
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-- - calls `symlink`
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-- - calls `getcwd` in Overwrite mode (if destination is a relative path)
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recreateSymlink :: Path b1 -- ^ the old symlink file
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-> Path b2 -- ^ destination file
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-> CopyMode
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-> IO ()
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recreateSymlink (Path symsourceBS) (Path newsymBS) cm
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= RD.recreateSymlink symsourceBS newsymBS cm
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|
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-- |Copies the given regular file to the given destination.
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-- Neither follows symbolic links, nor accepts them.
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-- For "copying" symbolic links, use `recreateSymlink` instead.
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--
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-- Note that this is still sort of a low-level function and doesn't
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-- examine file types. For a more high-level version, use `easyCopy`
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-- instead.
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--
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-- In `Overwrite` copy mode only overwrites actual files, not directories.
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-- In `Strict` mode the destination file must not exist.
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--
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-- Safety/reliability concerns:
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--
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-- * `Overwrite` mode is not atomic
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-- * when used on `CharacterDevice`, reads the "contents" and copies
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-- them to a regular file, which might take indefinitely
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-- * when used on `BlockDevice`, may either read the "contents"
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-- and copy them to a regular file (potentially hanging indefinitely)
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-- or may create a regular empty destination file
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-- * when used on `NamedPipe`, will hang indefinitely
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--
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-- Throws:
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--
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-- - `NoSuchThing` if source file does not exist
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-- - `NoSuchThing` if source file is a a `Socket`
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-- - `PermissionDenied` if output directory is not writable
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-- - `PermissionDenied` if source directory can't be opened
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-- - `InvalidArgument` if source file is wrong type (symlink or directory)
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-- - `SameFile` if source and destination are the same file
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-- (`HPathIOException`)
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--
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-- Throws in `Strict` mode only:
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--
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-- - `AlreadyExists` if destination already exists
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--
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-- Notes:
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--
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-- - may call `getcwd` in Overwrite mode (if destination is a relative path)
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copyFile :: Path b1 -- ^ source file
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-> Path b2 -- ^ destination file
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-> CopyMode
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-> IO ()
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copyFile (Path from) (Path to) cm = RD.copyFile from to cm
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-- |Copies a regular file, directory or symbolic link. In case of a
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-- symbolic link it is just recreated, even if it points to a directory.
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-- Any other file type is ignored.
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--
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-- Safety/reliability concerns:
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--
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-- * examines filetypes explicitly
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-- * calls `copyDirRecursive` for directories
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--
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-- Note: may call `getcwd` in Overwrite mode (if destination is a relative path)
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easyCopy :: Path b1
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-> Path b2
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-> CopyMode
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-> RecursiveErrorMode
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-> IO ()
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easyCopy (Path from) (Path to) cm rm = RD.easyCopy from to cm rm
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---------------------
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--[ File Deletion ]--
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---------------------
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-- |Deletes the given file. Raises `eISDIR`
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-- if run on a directory. Does not follow symbolic links.
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--
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-- Throws:
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--
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-- - `InappropriateType` for wrong file type (directory)
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-- - `NoSuchThing` if the file does not exist
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-- - `PermissionDenied` if the directory cannot be read
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deleteFile :: Path b -> IO ()
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deleteFile (Path p) = RD.deleteFile p
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|
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-- |Deletes the given directory, which must be empty, never symlinks.
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--
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-- Throws:
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--
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-- - `InappropriateType` for wrong file type (symlink to directory)
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-- - `InappropriateType` for wrong file type (regular file)
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-- - `NoSuchThing` if directory does not exist
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-- - `UnsatisfiedConstraints` if directory is not empty
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-- - `PermissionDenied` if we can't open or write to parent directory
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--
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-- Notes: calls `rmdir`
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deleteDir :: Path b -> IO ()
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deleteDir (Path p) = RD.deleteDir p
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|
|
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-- |Deletes the given directory recursively. Does not follow symbolic
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-- links. Tries `deleteDir` first before attemtping a recursive
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-- deletion.
|
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--
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-- On directory contents this behaves like `easyDelete`
|
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-- and thus will ignore any file type that is not `RegularFile`,
|
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-- `SymbolicLink` or `Directory`.
|
|
--
|
|
-- Safety/reliability concerns:
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|
--
|
|
-- * not atomic
|
|
-- * examines filetypes explicitly
|
|
--
|
|
-- Throws:
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|
--
|
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-- - `InappropriateType` for wrong file type (symlink to directory)
|
|
-- - `InappropriateType` for wrong file type (regular file)
|
|
-- - `NoSuchThing` if directory does not exist
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-- - `PermissionDenied` if we can't open or write to parent directory
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deleteDirRecursive :: Path b -> IO ()
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deleteDirRecursive (Path p) = RD.deleteDirRecursive p
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|
|
|
|
|
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-- |Deletes a file, directory or symlink.
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-- In case of directory, performs recursive deletion. In case of
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-- a symlink, the symlink file is deleted.
|
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-- Any other file type is ignored.
|
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--
|
|
-- Safety/reliability concerns:
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|
--
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-- * examines filetypes explicitly
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|
-- * calls `deleteDirRecursive` for directories
|
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easyDelete :: Path b -> IO ()
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easyDelete (Path p) = RD.easyDelete p
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|
|
|
|
|
|
|
|
|
--------------------
|
|
--[ File Opening ]--
|
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--------------------
|
|
|
|
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-- |Opens a file appropriately by invoking xdg-open. The file type
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-- is not checked. This forks a process.
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openFile :: Path b
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-> IO ProcessID
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openFile (Path fp) = RD.openFile fp
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|
|
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-- |Executes a program with the given arguments. This forks a process.
|
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executeFile :: Path b -- ^ program
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-> [ByteString] -- ^ arguments
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-> IO ProcessID
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executeFile (Path fp) args = RD.executeFile fp args
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|
|
|
|
|
|
|
|
|
---------------------
|
|
--[ File Creation ]--
|
|
---------------------
|
|
|
|
|
|
-- |Create an empty regular file at the given directory with the given
|
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-- filename.
|
|
--
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|
-- Throws:
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--
|
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-- - `PermissionDenied` if output directory cannot be written to
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-- - `AlreadyExists` if destination already exists
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-- - `NoSuchThing` if any of the parent components of the path
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-- do not exist
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createRegularFile :: FileMode -> Path b -> IO ()
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createRegularFile fm (Path destBS) = RD.createRegularFile fm destBS
|
|
|
|
|
|
-- |Create an empty directory at the given directory with the given filename.
|
|
--
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|
-- Throws:
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|
--
|
|
-- - `PermissionDenied` if output directory cannot be written to
|
|
-- - `AlreadyExists` if destination already exists
|
|
-- - `NoSuchThing` if any of the parent components of the path
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-- do not exist
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createDir :: FileMode -> Path b -> IO ()
|
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createDir fm (Path destBS) = RD.createDir fm destBS
|
|
|
|
-- |Create an empty directory at the given directory with the given filename.
|
|
--
|
|
-- Throws:
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|
--
|
|
-- - `PermissionDenied` if output directory cannot be written to
|
|
-- - `NoSuchThing` if any of the parent components of the path
|
|
-- do not exist
|
|
createDirIfMissing :: FileMode -> Path b -> IO ()
|
|
createDirIfMissing fm (Path destBS) = RD.createDirIfMissing fm destBS
|
|
|
|
|
|
-- |Create an empty directory at the given directory with the given filename.
|
|
-- All parent directories are created with the same filemode. This
|
|
-- basically behaves like:
|
|
--
|
|
-- @
|
|
-- mkdir -p \/some\/dir
|
|
-- @
|
|
--
|
|
-- Safety/reliability concerns:
|
|
--
|
|
-- * not atomic
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `PermissionDenied` if any part of the path components do not
|
|
-- exist and cannot be written to
|
|
-- - `AlreadyExists` if destination already exists and
|
|
-- is *not* a directory
|
|
--
|
|
-- Note: calls `getcwd` if the input path is a relative path
|
|
createDirRecursive :: FileMode -> Path b -> IO ()
|
|
createDirRecursive fm (Path p) = RD.createDirRecursive fm p
|
|
|
|
|
|
|
|
-- |Create a symlink.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `PermissionDenied` if output directory cannot be written to
|
|
-- - `AlreadyExists` if destination file already exists
|
|
-- - `NoSuchThing` if any of the parent components of the path
|
|
-- do not exist
|
|
--
|
|
-- Note: calls `symlink`
|
|
createSymlink :: Path b -- ^ destination file
|
|
-> ByteString -- ^ path the symlink points to
|
|
-> IO ()
|
|
createSymlink (Path destBS) sympoint = RD.createSymlink destBS sympoint
|
|
|
|
|
|
|
|
----------------------------
|
|
--[ File Renaming/Moving ]--
|
|
----------------------------
|
|
|
|
|
|
-- |Rename a given file with the provided filename. Destination and source
|
|
-- must be on the same device, otherwise `eXDEV` will be raised.
|
|
--
|
|
-- Does not follow symbolic links, but renames the symbolic link file.
|
|
--
|
|
-- Safety/reliability concerns:
|
|
--
|
|
-- * has a separate set of exception handling, apart from the syscall
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if source file does not exist
|
|
-- - `PermissionDenied` if output directory cannot be written to
|
|
-- - `PermissionDenied` if source directory cannot be opened
|
|
-- - `UnsupportedOperation` if source and destination are on different
|
|
-- devices
|
|
-- - `AlreadyExists` if destination already exists
|
|
-- - `SameFile` if destination and source are the same file
|
|
-- (`HPathIOException`)
|
|
--
|
|
-- Note: calls `rename` (but does not allow to rename over existing files)
|
|
renameFile :: Path b1 -> Path b2 -> IO ()
|
|
renameFile (Path from) (Path to) = RD.renameFile from to
|
|
|
|
|
|
|
|
-- |Move a file. This also works across devices by copy-delete fallback.
|
|
-- And also works on directories.
|
|
--
|
|
-- Does not follow symbolic links, but renames the symbolic link file.
|
|
--
|
|
--
|
|
-- Safety/reliability concerns:
|
|
--
|
|
-- * `Overwrite` mode is not atomic
|
|
-- * copy-delete fallback is inherently non-atomic
|
|
-- * since this function calls `easyCopy` and `easyDelete` as a fallback
|
|
-- to `renameFile`, file types that are not `RegularFile`, `SymbolicLink`
|
|
-- or `Directory` may be ignored
|
|
-- * for `Overwrite` mode, the destination will be deleted (not recursively)
|
|
-- before moving
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if source file does not exist
|
|
-- - `PermissionDenied` if output directory cannot be written to
|
|
-- - `PermissionDenied` if source directory cannot be opened
|
|
-- - `SameFile` if destination and source are the same file
|
|
-- (`HPathIOException`)
|
|
--
|
|
-- Throws in `Strict` mode only:
|
|
--
|
|
-- - `AlreadyExists` if destination already exists
|
|
--
|
|
-- Notes:
|
|
--
|
|
-- - calls `rename` (but does not allow to rename over existing files)
|
|
-- - calls `getcwd` in Overwrite mode if destination is a relative path
|
|
moveFile :: Path b1 -- ^ file to move
|
|
-> Path b2 -- ^ destination
|
|
-> CopyMode
|
|
-> IO ()
|
|
moveFile (Path from) (Path to) cm = RD.moveFile from to cm
|
|
|
|
|
|
|
|
|
|
|
|
--------------------
|
|
--[ File Reading ]--
|
|
--------------------
|
|
|
|
|
|
-- |Read the given file *at once* into memory as a lazy ByteString.
|
|
-- Symbolic links are followed, no sanity checks on file size
|
|
-- or file type. File must exist. Uses Builders under the hood
|
|
-- (hence lazy ByteString).
|
|
--
|
|
-- Safety/reliability concerns:
|
|
--
|
|
-- * the whole file is read into memory, this doesn't read lazily
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `InappropriateType` if file is not a regular file or a symlink
|
|
-- - `PermissionDenied` if we cannot read the file or the directory
|
|
-- containting it
|
|
-- - `NoSuchThing` if the file does not exist
|
|
readFile :: Path b -> IO L.ByteString
|
|
readFile (Path path) = RD.readFile path
|
|
|
|
|
|
|
|
-- | Open the given file as a filestream. Once the filestream is
|
|
-- exits, the filehandle is cleaned up.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `InappropriateType` if file is not a regular file or a symlink
|
|
-- - `PermissionDenied` if we cannot read the file or the directory
|
|
-- containting it
|
|
-- - `NoSuchThing` if the file does not exist
|
|
readFileStream :: Path b
|
|
-> IO (SerialT IO ByteString)
|
|
readFileStream (Path fp) = RD.readFileStream fp
|
|
|
|
|
|
|
|
|
|
--------------------
|
|
--[ File Writing ]--
|
|
--------------------
|
|
|
|
|
|
-- |Write a given ByteString to a file, truncating the file beforehand.
|
|
-- Follows symlinks.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `InappropriateType` if file is not a regular file or a symlink
|
|
-- - `PermissionDenied` if we cannot read the file or the directory
|
|
-- containting it
|
|
-- - `NoSuchThing` if the file does not exist
|
|
writeFile :: Path b
|
|
-> Maybe FileMode -- ^ if Nothing, file must exist
|
|
-> ByteString
|
|
-> IO ()
|
|
writeFile (Path fp) fmode bs = RD.writeFile fp fmode bs
|
|
|
|
|
|
-- |Write a given lazy ByteString to a file, truncating the file beforehand.
|
|
-- Follows symlinks.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `InappropriateType` if file is not a regular file or a symlink
|
|
-- - `PermissionDenied` if we cannot read the file or the directory
|
|
-- containting it
|
|
-- - `NoSuchThing` if the file does not exist
|
|
--
|
|
-- Note: uses streamly under the hood
|
|
writeFileL :: Path b
|
|
-> Maybe FileMode -- ^ if Nothing, file must exist
|
|
-> L.ByteString
|
|
-> IO ()
|
|
writeFileL (Path fp) fmode lbs = RD.writeFileL fp fmode lbs
|
|
|
|
|
|
-- |Append a given ByteString to a file.
|
|
-- The file must exist. Follows symlinks.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `InappropriateType` if file is not a regular file or a symlink
|
|
-- - `PermissionDenied` if we cannot read the file or the directory
|
|
-- containting it
|
|
-- - `NoSuchThing` if the file does not exist
|
|
appendFile :: Path b -> ByteString -> IO ()
|
|
appendFile (Path fp) bs = RD.appendFile fp bs
|
|
|
|
|
|
|
|
|
|
-----------------------
|
|
--[ File Permissions]--
|
|
-----------------------
|
|
|
|
|
|
-- |Default permissions for a new file.
|
|
newFilePerms :: FileMode
|
|
newFilePerms
|
|
= ownerWriteMode
|
|
`unionFileModes` ownerReadMode
|
|
`unionFileModes` groupWriteMode
|
|
`unionFileModes` groupReadMode
|
|
`unionFileModes` otherWriteMode
|
|
`unionFileModes` otherReadMode
|
|
|
|
|
|
-- |Default permissions for a new directory.
|
|
newDirPerms :: FileMode
|
|
newDirPerms
|
|
= ownerModes
|
|
`unionFileModes` groupExecuteMode
|
|
`unionFileModes` groupReadMode
|
|
`unionFileModes` otherExecuteMode
|
|
`unionFileModes` otherReadMode
|
|
|
|
|
|
|
|
|
|
-------------------
|
|
--[ File checks ]--
|
|
-------------------
|
|
|
|
|
|
-- |Checks if the given file exists.
|
|
-- Does not follow symlinks.
|
|
--
|
|
-- Only eNOENT is catched (and returns False).
|
|
doesExist :: Path b -> IO Bool
|
|
doesExist (Path bs) = RD.doesExist bs
|
|
|
|
|
|
-- |Checks if the given file exists and is not a directory.
|
|
-- Does not follow symlinks.
|
|
--
|
|
-- Only eNOENT is catched (and returns False).
|
|
doesFileExist :: Path b -> IO Bool
|
|
doesFileExist (Path bs) = RD.doesFileExist bs
|
|
|
|
|
|
-- |Checks if the given file exists and is a directory.
|
|
-- Does not follow symlinks.
|
|
--
|
|
-- Only eNOENT is catched (and returns False).
|
|
doesDirectoryExist :: Path b -> IO Bool
|
|
doesDirectoryExist (Path bs) = RD.doesDirectoryExist bs
|
|
|
|
|
|
-- |Checks whether a file or folder is readable.
|
|
--
|
|
-- Only eACCES, eROFS, eTXTBSY, ePERM are catched (and return False).
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if the file does not exist
|
|
isReadable :: Path b -> IO Bool
|
|
isReadable (Path bs) = RD.isReadable bs
|
|
|
|
-- |Checks whether a file or folder is writable.
|
|
--
|
|
-- Only eACCES, eROFS, eTXTBSY, ePERM are catched (and return False).
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if the file does not exist
|
|
isWritable :: Path b -> IO Bool
|
|
isWritable (Path bs) = RD.isWritable bs
|
|
|
|
|
|
-- |Checks whether a file or folder is executable.
|
|
--
|
|
-- Only eACCES, eROFS, eTXTBSY, ePERM are catched (and return False).
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if the file does not exist
|
|
isExecutable :: Path b -> IO Bool
|
|
isExecutable (Path bs) = RD.isExecutable bs
|
|
|
|
|
|
|
|
-- |Checks whether the directory at the given path exists and can be
|
|
-- opened. This invokes `openDirStream` which follows symlinks.
|
|
canOpenDirectory :: Path b -> IO Bool
|
|
canOpenDirectory (Path bs) = RD.canOpenDirectory bs
|
|
|
|
|
|
|
|
|
|
------------------
|
|
--[ File times ]--
|
|
------------------
|
|
|
|
|
|
getModificationTime :: Path b -> IO UTCTime
|
|
getModificationTime (Path bs) = RD.getModificationTime bs
|
|
|
|
setModificationTime :: Path b -> EpochTime -> IO ()
|
|
setModificationTime (Path bs) t = RD.setModificationTime bs t
|
|
|
|
setModificationTimeHiRes :: Path b -> POSIXTime -> IO ()
|
|
setModificationTimeHiRes (Path bs) t = RD.setModificationTimeHiRes bs t
|
|
|
|
|
|
|
|
-------------------------
|
|
--[ Directory reading ]--
|
|
-------------------------
|
|
|
|
|
|
-- |Gets all filenames of the given directory. This excludes "." and "..".
|
|
-- This version does not follow symbolic links.
|
|
--
|
|
-- The contents are not sorted and there is no guarantee on the ordering.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if directory does not exist
|
|
-- - `InappropriateType` if file type is wrong (file)
|
|
-- - `InappropriateType` if file type is wrong (symlink to file)
|
|
-- - `InappropriateType` if file type is wrong (symlink to dir)
|
|
-- - `PermissionDenied` if directory cannot be opened
|
|
-- - `PathParseException` if a filename could not be parsed (should never happen)
|
|
getDirsFiles :: Path b -- ^ dir to read
|
|
-> IO [Path b]
|
|
getDirsFiles p@(Path fp) = do
|
|
contents <- getDirsFiles' p
|
|
pure $ fmap (p </>) contents
|
|
|
|
|
|
-- | Like 'getDirsFiles', but returns the filename only, instead
|
|
-- of prepending the base path.
|
|
getDirsFiles' :: Path b -- ^ dir to read
|
|
-> IO [Path Rel]
|
|
getDirsFiles' (Path fp) = do
|
|
rawContents <- RD.getDirsFiles' fp
|
|
for rawContents $ \r -> parseRel r
|
|
|
|
|
|
|
|
|
|
---------------------------
|
|
--[ FileType operations ]--
|
|
---------------------------
|
|
|
|
|
|
-- |Get the file type of the file located at the given path. Does
|
|
-- not follow symbolic links.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if the file does not exist
|
|
-- - `PermissionDenied` if any part of the path is not accessible
|
|
getFileType :: Path b -> IO FileType
|
|
getFileType (Path fp) = RD.getFileType fp
|
|
|
|
|
|
|
|
--------------
|
|
--[ Others ]--
|
|
--------------
|
|
|
|
|
|
|
|
-- |Applies `realpath` on the given path.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `NoSuchThing` if the file at the given path does not exist
|
|
-- - `NoSuchThing` if the symlink is broken
|
|
-- - `PathParseException` if realpath does not return an absolute path
|
|
canonicalizePath :: Path b -> IO (Path Abs)
|
|
canonicalizePath (Path l) = do
|
|
nl <- RD.canonicalizePath l
|
|
parseAbs nl
|
|
|
|
|
|
-- |Converts any path to an absolute path.
|
|
-- This is done in the following way:
|
|
--
|
|
-- - if the path is already an absolute one, just return it
|
|
-- - if it's a relative path, prepend the current directory to it
|
|
toAbs :: Path b -> IO (Path Abs)
|
|
toAbs (Path bs) = do
|
|
let mabs = parseAbs bs :: Maybe (Path Abs)
|
|
case mabs of
|
|
Just a -> return a
|
|
Nothing -> do
|
|
cwd <- getWorkingDirectory >>= parseAbs
|
|
rel <- parseRel bs -- we know it must be relative now
|
|
return $ cwd </> rel
|
|
|
|
|
|
-- | Helper function to use the Path library without
|
|
-- buying into the Path type too much. This uses 'parseAny'
|
|
-- under the hood and may throw `PathParseException`.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `PathParseException` if the bytestring could neither be parsed as
|
|
-- relative or absolute Path
|
|
withRawFilePath :: MonadThrow m => ByteString -> (Either (Path Abs) (Path Rel) -> m b) -> m b
|
|
withRawFilePath bs action = do
|
|
path <- parseAny bs
|
|
action path
|
|
|
|
|
|
-- | Convenience function to open the path as a handle.
|
|
--
|
|
-- If the file does not exist, it will be created with 'newFilePerms'.
|
|
--
|
|
-- Throws:
|
|
--
|
|
-- - `PathParseException` if the bytestring could neither be parsed as
|
|
-- relative or absolute Path
|
|
withHandle :: ByteString
|
|
-> SPI.OpenMode
|
|
-> ((SIO.Handle, Either (Path Abs) (Path Rel)) -> IO a)
|
|
-> IO a
|
|
withHandle bs mode action = do
|
|
path <- parseAny bs
|
|
handle <-
|
|
bracketOnError (openFd bs mode [] (Just newFilePerms)) (SPI.closeFd)
|
|
$ SPI.fdToHandle
|
|
finally (action (handle, path)) (SIO.hClose handle)
|