chunked: Refactor temporary file creation

Replace the direct call to unix.Open with the O_TMPFILE flag
with the dedicated openTmpFile helper function.

Signed-off-by: Giuseppe Scrivano <[email protected]>

Author: giuseppe

pkg/chunked/storage_linux.go

@@ -163,13 +163,11 @@ func (c *chunkedDiffer) convertTarToZstdChunked(destDirectory string, payload *o
 
 	defer diff.Close()
 
-	fd, err := unix.Open(destDirectory, unix.O_TMPFILE|unix.O_RDWR|unix.O_CLOEXEC, 0o600)
+	f, err := openTmpFile(destDirectory)
 	if err != nil {
-		return 0, nil, "", nil, &fs.PathError{Op: "open", Path: destDirectory, Err: err}
+		return 0, nil, "", nil, err
 	}
 
-	f := os.NewFile(uintptr(fd), destDirectory)
-
 	newAnnotations := make(map[string]string)
 	level := 1
 	chunked, err := compressor.ZstdCompressor(f, newAnnotations, &level)