tailscale/net/dns/resolvconf.go

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