// machinedRegister checks if nspawn should register the pod to machined
func machinedRegister() bool {
// machined has a D-Bus interface following versioning guidelines, see:
// http://www.freedesktop.org/wiki/Software/systemd/machined/
// Therefore we can just check if the D-Bus method we need exists and we
// don't need to check the signature.
var found int
conn, err := dbus.SystemBus()
if err != nil {
return false
}
node, err := introspect.Call(conn.Object("org.freedesktop.machine1", "/org/freedesktop/machine1"))
if err != nil {
return false
}
for _, iface := range node.Interfaces {
if iface.Name != "org.freedesktop.machine1.Manager" {
continue
}
// machined v215 supports methods "RegisterMachine" and "CreateMachine" called by nspawn v215.
// machined v216+ (since commit 5aa4bb) additionally supports methods "CreateMachineWithNetwork"
// and "RegisterMachineWithNetwork", called by nspawn v216+.
for _, method := range iface.Methods {
if method.Name == "CreateMachineWithNetwork" || method.Name == "RegisterMachineWithNetwork" {
found++
}
}
break
}
return found == 2
}
func main() {
conn, err := dbus.SessionBus()
if err != nil {
panic(err)
}
node, err := introspect.Call(conn.Object("org.freedesktop.DBus", "/org/freedesktop/DBus"))
if err != nil {
panic(err)
}
data, _ := json.MarshalIndent(node, "", " ")
os.Stdout.Write(data)
}