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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Integration with the systemd logind API. See http://www.freedesktop.org/wiki/Software/systemd/logind/
package login1
import (
"fmt"
"os"
"strconv"
"github.com/godbus/dbus"
)
const (
dbusInterface = "org.freedesktop.login1.Manager"
dbusPath = "/org/freedesktop/login1"
)
// Conn is a connection to systemds dbus endpoint.
type Conn struct {
conn *dbus.Conn
object dbus.BusObject
}
// New() establishes a connection to the system bus and authenticates.
func New() (*Conn, error) {
c := new(Conn)
if err := c.initConnection(); err != nil {
return nil, err
}
return c, nil
}
func (c *Conn) initConnection() error {
var err error
c.conn, err = dbus.SystemBusPrivate()
if err != nil {
return err
}
// Only use EXTERNAL method, and hardcode the uid (not username)
// to avoid a username lookup (which requires a dynamically linked
// libc)
methods := []dbus.Auth{dbus.AuthExternal(strconv.Itoa(os.Getuid()))}
err = c.conn.Auth(methods)
if err != nil {
c.conn.Close()
return err
}
err = c.conn.Hello()
if err != nil {
c.conn.Close()
return err
}
c.object = c.conn.Object("org.freedesktop.login1", dbus.ObjectPath(dbusPath))
return nil
}
// Reboot asks logind for a reboot optionally asking for auth.
func (c *Conn) Reboot(askForAuth bool) {
c.object.Call(dbusInterface+".Reboot", 0, askForAuth)
}
// Inhibit takes inhibition lock in logind.
func (c *Conn) Inhibit(what, who, why, mode string) (*os.File, error) {
var fd dbus.UnixFD
err := c.object.Call(dbusInterface+".Inhibit", 0, what, who, why, mode).Store(&fd)
if err != nil {
return nil, err
}
return os.NewFile(uintptr(fd), "inhibit"), nil
}
// Subscribe to signals on the logind dbus
func (c *Conn) Subscribe(members ...string) chan *dbus.Signal {
for _, member := range members {
c.conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0,
fmt.Sprintf("type='signal',interface='org.freedesktop.login1.Manager',member='%s'", member))
}
ch := make(chan *dbus.Signal, 10)
c.conn.Signal(ch)
return ch
}
// PowerOff asks logind for a power off optionally asking for auth.
func (c *Conn) PowerOff(askForAuth bool) {
c.object.Call(dbusInterface+".PowerOff", 0, askForAuth)
}
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