swarm_join.rb
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swarm_join.rb
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	#!/opt/puppetlabs/puppet/bin/ruby
	# frozen_string_literal: true

	require 'json'
	require 'open3'
	require 'puppet'

	def swarm_join(advertise_addr, listen_addr, token, manager_ip)
	cmd_string = 'docker swarm join'
	cmd_string += " --advertise-addr=#{advertise_addr}" unless advertise_addr.nil?
	cmd_string += " --listen-addr=#{listen_addr}" unless listen_addr.nil?
	cmd_string += " --token=#{token}" unless token.nil?
	cmd_string += " #{manager_ip}" unless manager_ip.nil?

	stdout, stderr, status = Open3.capture3(cmd_string)
	raise Puppet::Error, "stderr: '#{stderr}'" if status != 0
	stdout.strip
	end

	params = JSON.parse(STDIN.read)
	advertise_addr = params['advertise_addr']
	listen_addr = params['listen_addr']
	token = params['token']
	manager_ip = params['manager_ip']

	begin
	result = swarm_join(advertise_addr, listen_addr, token, manager_ip)
	puts result
	exit 0
	rescue Puppet::Error => e
	puts(status: 'failure', error: e.message)
	exit 1
	end