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require 'rails/vendor_gem_source_index'
module Gem
def self.source_index=(index)
@@source_index = index
end
end
module Rails
class GemDependency
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]
req = options[:requirement]
elsif options[:version]
req = Gem::Requirement.create(options[:version])
else
req = Gem::Requirement.default
end
@dep = Gem::Dependency.new(name, req)
@lib = options[:lib]
@source = options[:source]
@loaded = @frozen = @load_paths_added = false
end
def add_load_paths
self.class.add_frozen_gem_path
return if @loaded || @load_paths_added
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
all_dependencies += all_dependencies.map(&:dependencies).flatten
all_dependencies.uniq
end
def gem_dir(base_directory)
File.join(base_directory, specification.full_name)
end
def load
return if @loaded || @load_paths_added == 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 ||= vendor_rails? || vendor_gem?
end
def 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
def install
cmd = "#{gem_command} #{install_command.join(' ')}"
puts cmd
puts %x(#{cmd})
end
def unpack_to(directory)
FileUtils.mkdir_p directory
Dir.chdir directory do
Gem::GemRunner.new.run(unpack_command)
end
# copy the gem's specification into GEMDIR/.specification so that
# 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 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
# 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
def gem_command
RUBY_PLATFORM =~ /win32/ ? 'gem.bat' : 'gem'
end
def install_command
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
cmd << "--version" << "= "+specification.version.to_s if requirement
cmd
end
end
end
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