docker_stack_flags.rb
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docker_stack_flags.rb
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	require 'shellwords'
	#
	# docker_stack_flags.rb
	#
	module Puppet::Parser::Functions
	# Transforms a hash into a string of docker swarm init flags
	newfunction(:docker_stack_flags, :type => :rvalue) do \|args\|
	opts = args[0] \|\| {}
	flags = []

	if opts['bundle_file'] && opts['bundle_file'].to_s != 'undef'
	flags << "--bundle-file '#{opts['bundle_file']}'"
	end

	if opts['compose_files'] && opts['compose_files'].to_s != 'undef'
	opts['compose_files'].each do \|file\|
	flags << "--compose-file '#{file}'"
	end
	end

	if opts['resolve_image'] && opts['resolve_image'].to_s != 'undef'
	flags << "--resolve-image '#{opts['resolve_image']}'"
	end

	if opts['prune'] && opts['prune'].to_s != 'undef'
	flags << "--prune '#{opts['prune']}'"
	end

	if opts['with_registry_auth'] && opts['with_registry_auth'].to_s != 'undef'
	flags << '--with-registry-auth'
	end

	flags.flatten.join(' ')
	end
	end