mirror of
https://github.com/tailscale/tailscale.git
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44 lines
969 B
Go
44 lines
969 B
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build unix
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package dns
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import (
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"context"
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"os"
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"path/filepath"
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"syscall"
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"testing"
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)
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func TestWriteFileUmask(t *testing.T) {
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// Set a umask that disallows world-readable files for the duration of
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// this test.
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oldUmask := syscall.Umask(0027)
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defer syscall.Umask(oldUmask)
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tmp := t.TempDir()
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fs := directFS{prefix: tmp}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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m := directManager{logf: t.Logf, fs: fs, ctx: ctx, ctxClose: cancel}
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const perms = 0644
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if err := m.atomicWriteFile(fs, "resolv.conf", []byte("nameserver 8.8.8.8\n"), perms); err != nil {
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t.Fatal(err)
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}
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// Ensure that the created file has the world-readable bit set.
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fi, err := os.Stat(filepath.Join(tmp, "resolv.conf"))
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if err != nil {
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t.Fatal(err)
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}
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if got := fi.Mode().Perm(); got != perms {
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t.Fatalf("file mode: got 0o%o, want 0o%o", got, perms)
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}
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}
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