code: function installUdevRules() {
  	if (!systemSupportsUdev()) {
  		return when.reject(new Error('Not supported'));
  	}
  	return when.promise((resolve, reject) => {
  		const cmd = `sudo cp "${UDEV_RULES_ASSET_FILE}" "${UDEV_RULES_SYSTEM_FILE}"`;
  		console.log(cmd);
  		childProcess.exec(cmd, err => {
  			if (err) {
  				_udevRulesInstalled = undefined;
  				return reject(new VError(err, 'Could not install udev rules'));
  			}
  			_udevRulesInstalled = true;
  			resolve();
  		});
  	});
  }
docs: Install the udev rules.
  
  @return {Promise}