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