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30 lines
902 B
Go
30 lines
902 B
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build linux freebsd openbsd
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package dns
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import (
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"os/exec"
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"tailscale.com/types/logger"
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)
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func newResolvconfManager(logf logger.Logf) (OSConfigurator, error) {
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_, err := exec.Command("resolvconf", "--version").CombinedOutput()
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if err != nil {
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if exitErr, ok := err.(*exec.ExitError); ok && exitErr.ExitCode() == 99 {
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// Debian resolvconf doesn't understand --version, and
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// exits with a specific error code.
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return newDebianResolvconfManager(logf)
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}
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}
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// If --version works, or we got some surprising error while
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// probing, use openresolv. It's the more common implementation,
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// so in cases where we can't figure things out, it's the least
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// likely to misbehave.
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return newOpenresolvManager()
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}
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