diff options
Diffstat (limited to 'railties/lib/rails/gem_dependency.rb')
-rw-r--r-- | railties/lib/rails/gem_dependency.rb | 142 |
1 files changed, 111 insertions, 31 deletions
diff --git a/railties/lib/rails/gem_dependency.rb b/railties/lib/rails/gem_dependency.rb index d58ae450eb..3b2f4846a6 100644 --- a/railties/lib/rails/gem_dependency.rb +++ b/railties/lib/rails/gem_dependency.rb @@ -1,50 +1,76 @@ +require 'rails/vendor_gem_source_index' + +module Gem + def self.source_index=(index) + @@source_index = index + end +end + module Rails class GemDependency - attr_accessor :name, :requirement, :version, :lib, :source + attr_accessor :lib, :source def self.unpacked_path @unpacked_path ||= File.join(RAILS_ROOT, 'vendor', 'gems') end + @@framework_gems = {} + + def self.add_frozen_gem_path + @@paths_loaded ||= begin + Gem.source_index = Rails::VendorGemSourceIndex.new(Gem.source_index) + # loaded before us - we can't change them, so mark them + Gem.loaded_specs.each do |name, spec| + @@framework_gems[name] = spec + end + end + end + + def framework_gem? + @@framework_gems.has_key?(name) + end + + def vendor_rails? + Gem.loaded_specs.has_key?(name) && Gem.loaded_specs[name].loaded_from.empty? + end + + def vendor_gem? + Gem.loaded_specs.has_key?(name) && Gem.loaded_specs[name].loaded_from.include?(self.class.unpacked_path) + end + def initialize(name, options = {}) require 'rubygems' unless Object.const_defined?(:Gem) if options[:requirement] - @requirement = options[:requirement] + req = options[:requirement] elsif options[:version] - @requirement = Gem::Requirement.create(options[:version]) + req = Gem::Requirement.create(options[:version]) + else + req = Gem::Requirement.default end - @version = @requirement.instance_variable_get("@requirements").first.last if @requirement - @name = name.to_s + @dep = Gem::Dependency.new(name, req) @lib = options[:lib] @source = options[:source] @loaded = @frozen = @load_paths_added = false - @unpack_directory = nil - end - - def unpacked_paths - Dir[File.join(self.class.unpacked_path, "#{@name}-#{@version || "*"}")] end def add_load_paths + self.class.add_frozen_gem_path return if @loaded || @load_paths_added - unpacked_paths = self.unpacked_paths - if unpacked_paths.empty? - args = [@name] - args << @requirement.to_s if @requirement - gem *args - else - $LOAD_PATH.unshift File.join(unpacked_paths.first, 'lib') - ext = File.join(unpacked_paths.first, 'ext') - $LOAD_PATH.unshift(ext) if File.exist?(ext) - @frozen = true + if framework_gem? + @load_paths_added = @loaded = @frozen = true + return end + gem @dep + @spec = Gem.loaded_specs[name] + @frozen = @spec.loaded_from.include?(self.class.unpacked_path) if @spec @load_paths_added = true rescue Gem::LoadError end def dependencies + return [] if framework_gem? all_dependencies = specification.dependencies.map do |dependency| GemDependency.new(dependency.name, :requirement => dependency.version_requirements) end @@ -58,22 +84,51 @@ module Rails def load return if @loaded || @load_paths_added == false - require(@lib || @name) unless @lib == false + require(@lib || name) unless @lib == false @loaded = true rescue LoadError puts $!.to_s $!.backtrace.each { |b| puts b } end + def name + @dep.name.to_s + end + + def requirement + r = @dep.version_requirements + (r == Gem::Requirement.default) ? nil : r + end + def frozen? - @frozen + @frozen ||= vendor_rails? || vendor_gem? end def loaded? - @loaded + @loaded ||= begin + if vendor_rails? + true + else + # check if the gem is loaded by inspecting $" + # specification.files lists all the files contained in the gem + gem_files = specification.files + # select only the files contained in require_paths - typically in bin and lib + require_paths_regexp = Regexp.new("^(#{specification.require_paths*'|'})/") + gem_lib_files = gem_files.select { |f| require_paths_regexp.match(f) } + # chop the leading directory off - a typical file might be in + # lib/gem_name/file_name.rb, but it will be 'require'd as gem_name/file_name.rb + gem_lib_files.map! { |f| f.split('/', 2)[1] } + # if any of the files from the above list appear in $", the gem is assumed to + # have been loaded + !(gem_lib_files & $").empty? + end + end end def load_paths_added? + # always try to add load paths - even if a gem is loaded, it may not + # be a compatible version (ie random_gem 0.4 is loaded and a later spec + # needs >= 0.5 - gem 'random_gem' will catch this and error out) @load_paths_added end @@ -93,17 +148,44 @@ module Rails # we can access information about the gem on deployment systems # without having the gem installed spec_filename = File.join(gem_dir(directory), '.specification') + # Gem.activate changes the spec - get the original + spec = Gem::Specification.load(specification.loaded_from) File.open(spec_filename, 'w') do |file| - file.puts specification.to_yaml + file.puts spec.to_yaml end end def ==(other) self.name == other.name && self.requirement == other.requirement end + alias_method :"eql?", :"==" + + def hash + @dep.hash + end def specification - @spec ||= Gem.source_index.search(Gem::Dependency.new(@name, @requirement)).sort_by { |s| s.version }.last + # code repeated from Gem.activate. Find a matching spec, or the currently loaded version. + # error out if loaded version and requested version are incompatible. + @spec ||= begin + matches = Gem.source_index.search(@dep) + matches << @@framework_gems[name] if framework_gem? + if Gem.loaded_specs[name] then + # This gem is already loaded. If the currently loaded gem is not in the + # list of candidate gems, then we have a version conflict. + existing_spec = Gem.loaded_specs[name] + unless matches.any? { |spec| spec.version == existing_spec.version } then + raise Gem::Exception, + "can't activate #{@dep}, already activated #{existing_spec.full_name}" + end + # we're stuck with it, so change to match + @dep.version_requirements = Gem::Requirement.create("=#{existing_spec.version}") + existing_spec + else + # new load + matches.last + end + end end private @@ -112,17 +194,15 @@ module Rails end def install_command - cmd = %w(install) << @name - cmd << "--version" << %("#{@requirement.to_s}") if @requirement + cmd = %w(install) << name + cmd << "--version" << %("#{requirement.to_s}") if requirement cmd << "--source" << @source if @source cmd end def unpack_command - cmd = %w(unpack) << @name - # We don't quote this requirement as it's run through GemRunner instead - # of shelling out to gem - cmd << "--version" << @requirement.to_s if @requirement + cmd = %w(unpack) << name + cmd << "--version" << "= "+specification.version.to_s if requirement cmd end end |