I want to control systemd services and daemons through dbus in nodejs
each time I want to connect to the system bus and run a command the program hangs in an infinite loop
I used node-dbus
const dbus = require("dbus");
const someBus = dbus.getBus('system');
someBus.getInterface('org.freedesktop.systemd1',
'/org/freedesktop/systemd1',
(err, interface) => {
if (err) throw new Error(err)
console.log(interface)
})
The documentation says getInterface takes four parameters:
Bus.prototype.getInterface(serviceName, objectPath, interfaceName, callback)
You appear to have missed the interfaceName parameter. Looking at the interfaces available at that serviceName and objectPath it seems that you want org.freedesktop.systemd1.Manager
$ busctl introspect org.freedesktop.systemd1 /org/freedesktop/systemd1 | grep interface
org.freedesktop.DBus.Introspectable interface - - -
org.freedesktop.DBus.Peer interface - - -
org.freedesktop.DBus.Properties interface - - -
org.freedesktop.systemd1.Manager interface - - -
So it should look like this:
const dbus = require("dbus");
const someBus = dbus.getBus('system');
someBus.getInterface('org.freedesktop.systemd1',
'/org/freedesktop/systemd1', 'org.freedesktop.systemd1.Manager',
(err, interface) => {
if (err) throw new Error(err)
console.log(interface)
})
The list of methods on that interface are:
$ busctl introspect org.freedesktop.systemd1 /org/freedesktop/systemd1 org.freedesktop.systemd1.Manager | grep method
.AbandonScope method s - -
.AddDependencyUnitFiles method asssbb a(sss) -
.AttachProcessesToUnit method ssau - -
.CancelJob method u - -
.ClearJobs method - - -
.DisableUnitFiles method asb a(sss) -
.Dump method - s -
.DumpByFileDescriptor method - h -
.EnableUnitFiles method asbb ba(sss) -
.Exit method - - -
.GetDefaultTarget method - s -
.GetDynamicUsers method - a(us) -
.GetJob method u o -
.GetJobAfter method u a(usssoo) -
.GetJobBefore method u a(usssoo) -
.GetUnit method s o -
.GetUnitByControlGroup method s o -
.GetUnitByInvocationID method ay o -
.GetUnitByPID method u o -
.GetUnitFileLinks method sb as -
.GetUnitFileState method s s -
.GetUnitProcesses method s a(sus) -
.Halt method - - -
.KExec method - - -
.KillUnit method ssi - -
.LinkUnitFiles method asbb a(sss) -
.ListJobs method - a(usssoo) -
.ListUnitFiles method - a(ss) -
.ListUnitFilesByPatterns method asas a(ss) -
.ListUnits method - a(ssssssouso) -
.ListUnitsByNames method as a(ssssssouso) -
.ListUnitsByPatterns method asas a(ssssssouso) -
.ListUnitsFiltered method as a(ssssssouso) -
.LoadUnit method s o -
.LookupDynamicUserByName method s u -
.LookupDynamicUserByUID method u s -
.MaskUnitFiles method asbb a(sss) -
.PowerOff method - - -
.PresetAllUnitFiles method sbb a(sss) -
.PresetUnitFiles method asbb ba(sss) -
.PresetUnitFilesWithMode method assbb ba(sss) -
.Reboot method - - -
.ReenableUnitFiles method asbb ba(sss) -
.Reexecute method - - -
.RefUnit method s - -
.Reload method - - -
.ReloadOrRestartUnit method ss o -
.ReloadOrTryRestartUnit method ss o -
.ReloadUnit method ss o -
.ResetFailed method - - -
.ResetFailedUnit method s - -
.RestartUnit method ss o -
.RevertUnitFiles method as a(sss) -
.SetDefaultTarget method sb a(sss) -
.SetEnvironment method as - -
.SetExitCode method y - -
.SetUnitProperties method sba(sv) - -
.StartTransientUnit method ssa(sv)a(sa(sv)) o -
.StartUnit method ss o -
.StartUnitReplace method sss o -
.StopUnit method ss o -
.Subscribe method - - -
.SwitchRoot method ss - -
.TryRestartUnit method ss o -
.UnmaskUnitFiles method asb a(sss) -
.UnrefUnit method s - -
.UnsetAndSetEnvironment method asas - -
.UnsetEnvironment method as - -
.Unsubscribe method - - -