| /* |
| Copyright 2013 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 D-Bus API. See http://www.freedesktop.org/wiki/Software/systemd/dbus/ |
| package dbus |
| |
| import ( |
| "os" |
| "strconv" |
| "strings" |
| "sync" |
| |
| "github.com/godbus/dbus" |
| ) |
| |
| const signalBuffer = 100 |
| |
| // ObjectPath creates a dbus.ObjectPath using the rules that systemd uses for |
| // serializing special characters. |
| func ObjectPath(path string) dbus.ObjectPath { |
| path = strings.Replace(path, ".", "_2e", -1) |
| path = strings.Replace(path, "-", "_2d", -1) |
| path = strings.Replace(path, "@", "_40", -1) |
| |
| return dbus.ObjectPath(path) |
| } |
| |
| // Conn is a connection to systemds dbus endpoint. |
| type Conn struct { |
| sysconn *dbus.Conn |
| sysobj *dbus.Object |
| jobListener struct { |
| jobs map[dbus.ObjectPath]chan string |
| sync.Mutex |
| } |
| subscriber struct { |
| updateCh chan<- *SubStateUpdate |
| errCh chan<- error |
| sync.Mutex |
| ignore map[dbus.ObjectPath]int64 |
| cleanIgnore int64 |
| } |
| dispatch map[string]func(dbus.Signal) |
| } |
| |
| // 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 |
| } |
| |
| c.initJobs() |
| return c, nil |
| } |
| |
| func (c *Conn) initConnection() error { |
| var err error |
| c.sysconn, 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.sysconn.Auth(methods) |
| if err != nil { |
| c.sysconn.Close() |
| return err |
| } |
| |
| err = c.sysconn.Hello() |
| if err != nil { |
| c.sysconn.Close() |
| return err |
| } |
| |
| c.sysobj = c.sysconn.Object("org.freedesktop.systemd1", dbus.ObjectPath("/org/freedesktop/systemd1")) |
| |
| // Setup the listeners on jobs so that we can get completions |
| c.sysconn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0, |
| "type='signal', interface='org.freedesktop.systemd1.Manager', member='JobRemoved'") |
| c.initSubscription() |
| c.initDispatch() |
| |
| return nil |
| } |