cf06dac2b8* annex.thin and annex.hardlink are now supported on Windows. * unannex --fast now makes hard links on Windows.
57 lines
1.5 KiB
Haskell
57 lines
1.5 KiB
Haskell
{- file copying
|
|
-
|
|
- Copyright 2010-2014 Joey Hess <id@joeyh.name>
|
|
-
|
|
- License: BSD-2-clause
|
|
-}
|
|
|
|
{-# LANGUAGE CPP #-}
|
|
|
|
module Utility.CopyFile (
|
|
copyFileExternal,
|
|
createLinkOrCopy,
|
|
CopyMetaData(..)
|
|
) where
|
|
|
|
import Common
|
|
import qualified Build.SysConfig as SysConfig
|
|
|
|
data CopyMetaData
|
|
-- Copy timestamps when possible, but no other metadata, and
|
|
-- when copying a symlink, makes a copy of its content.
|
|
= CopyTimeStamps
|
|
-- Copy all metadata when possible.
|
|
| CopyAllMetaData
|
|
deriving (Eq)
|
|
|
|
{- The cp command is used, because I hate reinventing the wheel,
|
|
- and because this allows easy access to features like cp --reflink. -}
|
|
copyFileExternal :: CopyMetaData -> FilePath -> FilePath -> IO Bool
|
|
copyFileExternal meta src dest = do
|
|
whenM (doesFileExist dest) $
|
|
removeFile dest
|
|
boolSystem "cp" $ params ++ [File src, File dest]
|
|
where
|
|
#ifndef __ANDROID__
|
|
params = map snd $ filter fst
|
|
[ (SysConfig.cp_reflink_auto, Param "--reflink=auto")
|
|
, (allmeta && SysConfig.cp_a, Param "-a")
|
|
, (allmeta && SysConfig.cp_p && not SysConfig.cp_a
|
|
, Param "-p")
|
|
, (not allmeta && SysConfig.cp_preserve_timestamps
|
|
, Param "--preserve=timestamps")
|
|
]
|
|
#else
|
|
params = if allmeta then [] else []
|
|
#endif
|
|
allmeta = meta == CopyAllMetaData
|
|
|
|
{- Create a hard link if the filesystem allows it, and fall back to copying
|
|
- the file. -}
|
|
createLinkOrCopy :: FilePath -> FilePath -> IO Bool
|
|
createLinkOrCopy src dest = go `catchIO` const fallback
|
|
where
|
|
go = do
|
|
createLink src dest
|
|
return True
|
|
fallback = copyFileExternal CopyAllMetaData src dest
|