1a8c4199b2
Config::Loader will be the new class responsible for loading configuration and replaces the previous dual-role "Vagrant::Config" played. While this commit is very early-stage, once this new architecture is flushed out, it will make loading, using, and extending configuration much easier and cleaner. Additionally, I believe this will help post Vagrant 1.0 if multi-language configuration is implemented.
91 lines
3.0 KiB
Ruby
91 lines
3.0 KiB
Ruby
require "pathname"
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require "log4r"
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module Vagrant
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module Config
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# This class is responsible for loading Vagrant configuration,
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# usually in the form of Vagrantfiles.
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#
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# Loading works by specifying the sources for the configuration
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# as well as the order the sources should be loaded. Configuration
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# set later always overrides those set earlier; this is how
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# configuration "scoping" is implemented.
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class Loader
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# This is an array of symbols specifying the order in which
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# configuration is loaded. For examples, see the class documentation.
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attr_accessor :load_order
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def initialize
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@logger = Log4r::Logger.new("vagrant::config::loader")
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@sources = {}
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end
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# Set the configuration data for the given name.
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#
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# The `name` should be a symbol and must uniquely identify the data
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# being given.
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#
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# `data` can either be a path to a Ruby Vagrantfile or a `Proc` directly.
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# `data` can also be an array of such values.
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#
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# At this point, no configuration is actually loaded. Note that calling
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# `set` multiple times with the same name will override any previously
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# set values. In this way, the last set data for a given name wins.
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def set(name, data)
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@logger.debug("Set #{name.inspect} = #{data.inspect}")
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# Make all sources an array.
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data = [data] if !data.kind_of?(Array)
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@sources[name] = data
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end
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# This loads the configured sources in the configured order and returns
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# an actual configuration object that is ready to be used.
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def load
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unknown_sources = @sources.keys - @load_order
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if !unknown_sources.empty?
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# TODO: Raise exception here perhaps.
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@logger.error("Unknown config sources: #{unknown_sources.inspect}")
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end
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@load_order.each do |key|
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@sources[key].each do |source|
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procs_for_source(source).each do |proc|
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# TODO: Call the proc with a configuration object.
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end
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end
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end
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end
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protected
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# This returns an array of `Proc` objects for the given source.
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# The `Proc` objects returned will expect a single argument for
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# the configuration object and are expected to mutate this
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# configuration object.
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def procs_for_source(source)
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return source if source.is_a?(Proc)
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# Assume all string sources are actually pathnames
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source = Pathname.new(source) if source.is_a?(String)
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if source.is_a?(Pathname)
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@logger.debug("Load procs for pathname: #{source.inspect}")
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begin
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return Config.capture_configures do
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Kernel.load source
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end
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rescue SyntaxError => e
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# Report syntax errors in a nice way.
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raise Errors::VagrantfileSyntaxError, :file => e.message
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end
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end
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raise Exception, "Unknown configuration source: #{source.inspect}"
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end
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end
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end
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end
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