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2690b4762f
This reverts commit 0267fe83b200f1702a2fa0a395442c02a053fadb. Reason: it converted the tree to Windows line endings. Updates #14299 Change-Id: I2271a61d43e99bd0bbcf9f4831e8783e570ba08a Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !js && !windows
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package atomicfile
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import (
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"net"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"testing"
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)
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func TestDoesNotOverwriteIrregularFiles(t *testing.T) {
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// Per tailscale/tailscale#7658 as one example, almost any imagined use of
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// atomicfile.Write should likely not attempt to overwrite an irregular file
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// such as a device node, socket, or named pipe.
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const filename = "TestDoesNotOverwriteIrregularFiles"
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var path string
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// macOS private temp does not allow unix socket creation, but /tmp does.
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if runtime.GOOS == "darwin" {
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path = filepath.Join("/tmp", filename)
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t.Cleanup(func() { os.Remove(path) })
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} else {
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path = filepath.Join(t.TempDir(), filename)
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}
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// The least troublesome thing to make that is not a file is a unix socket.
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// Making a null device sadly requires root.
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l, err := net.ListenUnix("unix", &net.UnixAddr{Name: path, Net: "unix"})
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if err != nil {
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t.Fatal(err)
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}
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defer l.Close()
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err = WriteFile(path, []byte("hello"), 0644)
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if err == nil {
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t.Fatal("expected error, got nil")
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}
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if !strings.Contains(err.Error(), "is not a regular file") {
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t.Fatalf("unexpected error: %v", err)
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}
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}
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