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60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2017 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package systemd
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import (
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"fmt"
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"net"
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"os"
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"strings"
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)
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var osGetenv = os.Getenv
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// SdNotify sends the given state string notification to systemd.
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//
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// inspired by libsystemd/sd-daemon/sd-daemon.c from the systemd source
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func SdNotify(notifyState string) error {
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if notifyState == "" {
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return fmt.Errorf("cannot use empty notify state")
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}
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notifySocket := osGetenv("NOTIFY_SOCKET")
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if notifySocket == "" {
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return fmt.Errorf("cannot find NOTIFY_SOCKET environment")
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}
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if !strings.HasPrefix(notifySocket, "@") && !strings.HasPrefix(notifySocket, "/") {
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return fmt.Errorf("cannot use NOTIFY_SOCKET %q", notifySocket)
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}
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raddr := &net.UnixAddr{
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Name: notifySocket,
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Net: "unixgram",
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}
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conn, err := net.DialUnix("unixgram", nil, raddr)
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if err != nil {
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return err
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}
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defer conn.Close()
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_, err = conn.Write([]byte(notifyState))
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return err
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}
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