You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
tailscale/atomicfile/atomicfile_test.go

39 lines
975 B
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build !js && !windows
package atomicfile
import (
"net"
"path/filepath"
"strings"
"testing"
)
func TestDoesNotOverwriteIrregularFiles(t *testing.T) {
// Per tailscale/tailscale#7658 as one example, almost any imagined use of
// atomicfile.Write should likely not attempt to overwrite an irregular file
// such as a device node, socket, or named pipe.
d := t.TempDir()
special := filepath.Join(d, "special")
// The least troublesome thing to make that is not a file is a unix socket.
// Making a null device sadly requries root.
l, err := net.ListenUnix("unix", &net.UnixAddr{Name: special, Net: "unix"})
if err != nil {
t.Fatal(err)
}
defer l.Close()
err = WriteFile(special, []byte("hello"), 0644)
if err == nil {
t.Fatal("expected error, got nil")
}
if !strings.Contains(err.Error(), "is not a regular file") {
t.Fatalf("unexpected error: %v", err)
}
}