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798fddbe5c
tsnet apps in particular never use the Linux DNS OSManagers, so they don't need DBus, etc. I started to pull that all out into separate features so tsnet doesn't need to bring in DBus, but hit this first. Here you can see that tsnet (and the k8s-operator) no longer pulls in inotify. Updates #17206 Change-Id: I7af0f391f60c5e7dbeed7a080346f83262346591 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build linux && !android
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// Package linuxdnsfight provides Linux support for detecting DNS fights
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// (inotify watching of /etc/resolv.conf).
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package linuxdnsfight
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import (
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"context"
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"fmt"
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"github.com/illarion/gonotify/v3"
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"tailscale.com/net/dns"
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)
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func init() {
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dns.HookWatchFile.Set(watchFile)
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}
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// watchFile sets up an inotify watch for a given directory and
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// calls the callback function every time a particular file is changed.
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// The filename should be located in the provided directory.
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func watchFile(ctx context.Context, dir, filename string, cb func()) error {
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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const events = gonotify.IN_ATTRIB |
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gonotify.IN_CLOSE_WRITE |
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gonotify.IN_CREATE |
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gonotify.IN_DELETE |
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gonotify.IN_MODIFY |
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gonotify.IN_MOVE
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watcher, err := gonotify.NewDirWatcher(ctx, events, dir)
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if err != nil {
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return fmt.Errorf("NewDirWatcher: %w", err)
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}
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for {
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select {
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case event := <-watcher.C:
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if event.Name == filename {
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cb()
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}
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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}
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