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

	if opts['username']
	flags << "-u '#{opts['username'].shellescape}'"
	end

	if opts['hostname']
	flags << "-h '#{opts['hostname'].shellescape}'"
	end

	if opts['restart']
	flags << "--restart '#{opts['restart']}'"
	end

	if opts['net']
	flags << "--net #{opts['net']}"
	end

	if opts['memory_limit']
	flags << "-m #{opts['memory_limit']}"
	end

	cpusets = [opts['cpuset']].flatten.compact
	unless cpusets.empty?
	value = cpusets.join(',')
	flags << "--cpuset-cpus=#{value}"
	end

	if opts['disable_network']
	flags << '-n false'
	end

	if opts['privileged']
	flags << '--privileged'
	end

	if opts['detach']
	flags << '--detach=true'
	end

	if opts['tty']
	flags << '-t'
	end

	if opts['read_only']
	flags << '--read-only=true'
	end

	multi_flags = lambda { \|values, format\|
	filtered = [values].flatten.compact
	filtered.map { \|val\| sprintf(format + " \\\n", val) }
	}

	[
	['--dns %s', 'dns'],
	['--dns-search %s', 'dns_search'],
	['--expose=%s', 'expose'],
	['--link %s', 'links'],
	['--lxc-conf="%s"', 'lxc_conf'],
	['--volumes-from %s', 'volumes_from'],
	['-e "%s"', 'env'],
	['--env-file %s', 'env_file'],
	['-p %s', 'ports'],
	['-l %s', 'labels'],
	['--add-host %s', 'hostentries'],
	['-v %s', 'volumes'],
	].each do \|(format, key)\|
	values = opts[key]
	new_flags = multi_flags.call(values, format)
	flags.concat(new_flags)
	end

	opts['extra_params'].each do \|param\|
	flags << param
	end

	# Some software (inc systemd) will truncate very long lines using glibc's
	# max line length. Wrap options across multiple lines with '\' to avoid
	flags.flatten.join(" \\\n ")
	end
	end

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