ruby.rb
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ruby.rb
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	require 'json'

	Puppet::Type.type(:docker_volume).provide(:ruby) do
	desc 'Support for Docker Volumes'

	mk_resource_methods
	commands docker: 'docker'

	def volume_conf
	flags = %w[volume create]
	multi_flags = lambda { \|values, format\|
	filtered = [values].flatten.compact
	filtered.map { \|val\| sprintf(format, val) }
	}

	[
	['--driver=%s', :driver],
	['--opt=%s', :options],
	].each do \|(format, key)\|
	values = resource[key]
	new_flags = multi_flags.call(values, format)
	flags.concat(new_flags)
	end
	flags << resource[:name]
	end

	def self.instances
	output = docker(%w[volume ls])
	lines = output.split("\n")
	lines.shift # remove header row
	lines.map do \|line\|
	driver, name = line.split(' ')
	inspect = docker(['volume', 'inspect', name])
	obj = JSON.parse(inspect).first
	new(
	:name => name,
	:mountpoint => obj['Mountpoint'],
	:options => obj['Options'],
	:ensure => :present,
	:driver => driver,
	)
	end
	end

	def self.prefetch(resources)
	instances.each do \|prov\|
	if (resource = resources[prov.name])
	resource.provider = prov
	end
	end
	end

	def exists?
	Puppet.info("Checking if docker volume #{name} exists")
	@property_hash[:ensure] == :present
	end

	def create
	Puppet.info("Creating docker volume #{name}")
	docker(volume_conf)
	end

	def destroy
	Puppet.info("Removing docker volume #{name}")
	docker(['volume', 'rm', name])
	end
	end