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https://github.com/yggdrasil-network/yggdrasil-go.git
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50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
//go:build linux
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// +build linux
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package main
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import (
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"net"
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"os"
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)
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// Notify systemd daemon when start up is completed.
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// Required to ensure that dependent services are started only after TUN interface is ready.
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//
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// One of the following is returned:
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// (false, nil) - notification not supported (i.e. `notifySocketEnv` is unset)
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// (false, err) - notification supported, but failure happened (e.g. error connecting to `notifySocketEnv` or while sending data)
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// (true, nil) - notification supported, data has been sent
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//
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// Based on `SdNotify` from [`coreos/go-systemd`](https://github.com/coreos/go-systemd/blob/7d375ecc2b092916968b5601f74cca28a8de45dd/daemon/sdnotify.go#L56)
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func notifyStartupCompleted() (bool, error) {
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const (
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notifyReady = "READY=1"
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notifySocketEnv = "NOTIFY_SOCKET"
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)
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socketAddr := &net.UnixAddr{
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Name: os.Getenv(notifySocketEnv),
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Net: "unixgram",
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}
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// `notifySocketEnv` not set
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if socketAddr.Name == "" {
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return false, nil
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}
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os.Unsetenv(notifySocketEnv)
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conn, err := net.DialUnix(socketAddr.Net, nil, socketAddr)
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// Error connecting to `notifySocketEnv`
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if err != nil {
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return false, err
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}
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defer conn.Close()
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if _, err = conn.Write([]byte(notifyReady)); err != nil {
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return false, err
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}
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return true, nil
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}
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