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{- git-annex file replacing
-
- Copyright 2013 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.ReplaceFile where
import Common.Annex
import Annex.Perms
{- Replaces a possibly already existing file with a new version,
- atomically, by running an action.
-
- The action is passed a temp file, which it can write to, and once
- done the temp file is moved into place.
-}
replaceFile :: FilePath -> (FilePath -> Annex ()) -> Annex ()
replaceFile file a = do
tmpdir <- fromRepo gitAnnexTmpDir
createAnnexDirectory tmpdir
tmpfile <- liftIO $ do
(tmpfile, h) <- openTempFileWithDefaultPermissions tmpdir $
takeFileName file
hClose h
return tmpfile
a tmpfile
liftIO $ do
r <- tryIO $ rename tmpfile file
case r of
Left _ -> do
createDirectoryIfMissing True $ parentDir file
rename tmpfile file
_ -> noop
|
