balena-systemd

This module provides some essential functions to interact with systemd Manager and systemd-login Manager services via D-Bus.

It uses Rust zbus crate to perform queries to the D-Bus socket and bind results to Node.js using neon-bindings.

This project has no goals of providing feature parity with the systemd API and new features will be added as-needed. PRs are welcome.

This project was bootstrapped by create-neon.

Supported features

ServiceManager

• Manager Object
  • Methods
    • GetUnit
    • StartUnit
    • StopUnit
    • RestartUnit
• Unit Object
  • Properties
    • ActiveState
    • PartOf

Example

import {ServiceManager, system} from '@balena/systemd';

(async() {
	// This returns a new connection to the bus
	// use singleton() if want to share a connection across
    // your code
	const bus = await system();
	const manager = new ServiceManager(bus);
	const unit = manager.getUnit('openvpn.service');

	// The property needs to be awaited
	const state = await unit.activeState;
	
	console.log('Unit openvpn.service state is', state);

    // Start the service.
    await unit.start();

    console.log('Unit openvpn.service state is now', await unit.activeState);
})();

LoginManager

• Manager Object
  • Methods
    • Reboot
    • PowerOff

Example

import {LoginManager, system} from '@balena/systemd';

(async() {
	// This returns a new connection to the bus
	// use singleton() if want to share a connection across
	const bus = await system();
	const manager = new LoginManager(bus);

	// WARNING: this WILL reboot the system!
	await manager.reboot(false);
})();

Installing balena-systemd

Installing the module requires a supported version of Node and Rust.

You can install the project with npm. In the project directory, run:

$ npm install

This fully installs the project, including installing any dependencies and running the build.

Building balena-systemd

If you have already installed the project and only want to run the build, run:

$ npm run build

This command uses the cargo-cp-artifact utility to run the Rust build and copy the built library into ./index.node. The build produces static binaries. Running this command will also compile the TypeScript sources and store the output under ./build.

Running a project that depends on this module

You probably need libstdc

Run integration tests

Integration tests are run automatically on each PR. To run the full test suite locally, you'll need Docker and docker-compose, and do

npm run test:compose