使用Golang启动D-Bus服务

Question

I'm now working on call and start a systemd service (mine just calls a shell script) using D-Bus API for golang.

I made a D-Bus service in /usr/share/dbus-1/system-services/org.freedesktop.hello.service

[D-BUS Service]
Name=org.freedesktop.hello
Exec=/bin/false
User=root
SystemdService=hello.service

And a systemd service in /lib/systemd/system/hello.service

[Unit]
Description=Hello

[Service]
Type=dbus
BusName=org.freedesktop.hello
ExecStart=/opt/hello.sh

I'm trying to acheive the same result of code below, which worked.

sudo gdbus call --system --dest org.freedesktop.hello --object-path /org/freedesktop/hello --method org.freedesktop.DBus.Introspectable.Introspect

However I keep getting the error in Golang,

The name org.freedesktop.hello was not provided by any .service files

My code for now is

package main

import (
    "encoding/json"
    "github.com/godbus/dbus"
    "os"
    "github.com/godbus/dbus/introspect"
)

func main() {
    conn, error1 := dbus.SessionBus()
    if error1 != nil {
        panic(error1)
    }
    node, err2 := introspect.Call(conn.Object("org.freedesktop.hello", "/org/freedesktop/hello"))
    if err2 != nil {
        panic(err2)
    }
    data, _ := json.MarshalIndent(node, "", "   ")
    os.Stdout.Write(data)
}

There aren't so many info about this stuff, so I want to get some help. Thanks!

Answer 1

sudo gdbus call --system ...

That's on the system bus.

...
conn, error1 := dbus.SessionBus()
...

And this is on the session bus.

Try to use something like dbus.SystemBus().