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