diff --git a/main/System/IO/Atomic.hs b/main/System/IO/Atomic.hs index 65a08218..94677be5 100644 --- a/main/System/IO/Atomic.hs +++ b/main/System/IO/Atomic.hs @@ -15,7 +15,7 @@ import Control.Monad (when) import System.Directory (doesFileExist, removeFile, renameFile) import System.FilePath (takeDirectory, takeFileName) import System.IO (Handle, hClose, openTempFileWithDefaultPermissions) -import System.Posix.Files (fileMode, getFileStatus, setFileMode) +import System.Posix.Files (fileMode, getFileStatus, setFileMode, setOwnerAndGroup, fileOwner, fileGroup) -- | Like @withFile@ but replaces the contents atomically. -- @@ -50,7 +50,14 @@ withOutputFile path act = transact begin commit rollback $ \(tpath, th) -> do copyAttributes (tpath, _th) = do exists <- doesFileExist path when exists $ do - getFileStatus path >>= setFileMode tpath . fileMode + status <- getFileStatus path + setFileMode tpath (fileMode status) + -- Set the temporary files owner to the same as the original file. + -- This only succeeds if either: + -- - The owner matches already, no change necessary + -- - The current user has the CAP_CHOWN permission + -- See also https://stackoverflow.com/a/49079630 for more context + setOwnerAndGroup tpath (fileOwner status) (fileGroup status) commit :: (FilePath, Handle) -> IO () commit (tpath, th) = hClose th *> renameFile tpath path