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main.go
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main.go
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//go:generate dbus-codegen-go -package=main -prefix=org.freedesktop.DBus -camelize -output=om.go -client-only om.xml
package main
import (
"context"
"flag"
"fmt"
"os"
"os/signal"
"github.com/godbus/dbus/v5"
)
var (
pathFlag dbus.ObjectPath
systemFlag bool
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [option...] DESTINATION\n\nOptions:\n", os.Args[0])
flag.PrintDefaults()
}
flag.StringVar((*string)(&pathFlag), "path", "/", "bus object `path`")
flag.BoolVar(&systemFlag, "system", false, "connect to the session bus")
flag.Parse()
if flag.NArg() != 1 {
flag.Usage()
os.Exit(1)
}
if err := run(flag.Arg(0)); err != nil {
fmt.Fprintf(os.Stderr, "error: %s\n", err)
os.Exit(1)
}
}
func run(dest string) error {
conn, err := connect(systemFlag)
if err != nil {
return err
}
defer conn.Close()
om := NewObjectManager(conn.Object(dest, pathFlag))
objects, err := om.GetManagedObjects(context.Background())
if err != nil {
return err
}
for path, ifaces := range objects {
fmt.Println(path)
for iface := range ifaces {
fmt.Printf(" %s\n", iface)
}
fmt.Println()
}
sigc := make(chan *dbus.Signal, 1)
conn.Signal(sigc)
defer conn.RemoveSignal(sigc)
for _, sig := range []Signal{
(*ObjectManagerInterfacesAddedSignal)(nil),
(*ObjectManagerInterfacesRemovedSignal)(nil),
} {
if err = AddMatchSignal(conn, sig, dbus.WithMatchSender(dest)); err != nil {
return err
}
}
ossigc := make(chan os.Signal, 1)
signal.Notify(ossigc, os.Interrupt)
for {
select {
case s := <-sigc:
v, err := LookupSignal(s)
if err != nil {
if err == ErrUnknownSignal {
continue
}
}
switch sig := v.(type) {
case *ObjectManagerInterfacesAddedSignal:
fmt.Printf("%s NEW\n", sig.Body.Object)
for iface := range sig.Body.Interfaces {
fmt.Printf(" %s\n", iface)
}
fmt.Println()
case *ObjectManagerInterfacesRemovedSignal:
fmt.Printf("%s DEL\n", sig.Body.Object)
for _, iface := range sig.Body.Interfaces {
fmt.Printf(" %s\n", iface)
}
fmt.Println()
default:
panic("should never get here")
}
case <-ossigc:
signal.Reset()
return nil
}
}
}
func connect(system bool) (*dbus.Conn, error) {
if system {
return dbus.SystemBus()
}
return dbus.SessionBus()
}