mirror of
https://github.com/ruby/ruby.git
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177 lines
4.4 KiB
Ruby
177 lines
4.4 KiB
Ruby
# frozen_string_literal: true
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require 'rubygems/command'
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require 'rubygems/version_option'
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require 'rubygems/security_option'
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require 'rubygems/remote_fetcher'
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require 'rubygems/package'
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# forward-declare
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module Gem::Security # :nodoc:
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class Policy # :nodoc:
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end
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end
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class Gem::Commands::UnpackCommand < Gem::Command
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include Gem::VersionOption
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include Gem::SecurityOption
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def initialize
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require 'fileutils'
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super 'unpack', 'Unpack an installed gem to the current directory',
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:version => Gem::Requirement.default,
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:target => Dir.pwd
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add_option('--target=DIR',
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'target directory for unpacking') do |value, options|
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options[:target] = value
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end
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add_option('--spec', 'unpack the gem specification') do |value, options|
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options[:spec] = true
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end
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add_security_option
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add_version_option
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end
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def arguments # :nodoc:
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"GEMNAME name of gem to unpack"
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end
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def defaults_str # :nodoc:
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"--version '#{Gem::Requirement.default}'"
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end
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def description
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<<-EOF
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The unpack command allows you to examine the contents of a gem or modify
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them to help diagnose a bug.
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You can add the contents of the unpacked gem to the load path using the
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RUBYLIB environment variable or -I:
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$ gem unpack my_gem
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Unpacked gem: '.../my_gem-1.0'
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[edit my_gem-1.0/lib/my_gem.rb]
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$ ruby -Imy_gem-1.0/lib -S other_program
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You can repackage an unpacked gem using the build command. See the build
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command help for an example.
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EOF
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end
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def usage # :nodoc:
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"#{program_name} GEMNAME"
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end
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#--
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# TODO: allow, e.g., 'gem unpack rake-0.3.1'. Find a general solution for
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# this, so that it works for uninstall as well. (And check other commands
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# at the same time.)
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def execute
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security_policy = options[:security_policy]
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get_all_gem_names.each do |name|
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dependency = Gem::Dependency.new name, options[:version]
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path = get_path dependency
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unless path
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alert_error "Gem '#{name}' not installed nor fetchable."
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next
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end
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if @options[:spec]
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spec, metadata = Gem::Package.raw_spec(path, security_policy)
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if metadata.nil?
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alert_error "--spec is unsupported on '#{name}' (old format gem)"
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next
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end
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spec_file = File.basename spec.spec_file
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FileUtils.mkdir_p @options[:target] if @options[:target]
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destination = begin
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if @options[:target]
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File.join @options[:target], spec_file
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else
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spec_file
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end
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end
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File.open destination, 'w' do |io|
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io.write metadata
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end
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else
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basename = File.basename path, '.gem'
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target_dir = File.expand_path basename, options[:target]
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package = Gem::Package.new path, security_policy
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package.extract_files target_dir
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say "Unpacked gem: '#{target_dir}'"
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end
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end
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end
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##
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#
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# Find cached filename in Gem.path. Returns nil if the file cannot be found.
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#
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#--
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# TODO: see comments in get_path() about general service.
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def find_in_cache(filename)
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Gem.path.each do |path|
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this_path = File.join(path, "cache", filename)
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return this_path if File.exist? this_path
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end
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return nil
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end
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##
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# Return the full path to the cached gem file matching the given
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# name and version requirement. Returns 'nil' if no match.
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#
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# Example:
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#
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# get_path 'rake', '> 0.4' # "/usr/lib/ruby/gems/1.8/cache/rake-0.4.2.gem"
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# get_path 'rake', '< 0.1' # nil
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# get_path 'rak' # nil (exact name required)
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#--
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# TODO: This should be refactored so that it's a general service. I don't
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# think any of our existing classes are the right place though. Just maybe
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# 'Cache'?
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#
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# TODO: It just uses Gem.dir for now. What's an easy way to get the list of
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# source directories?
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def get_path(dependency)
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return dependency.name if dependency.name =~ /\.gem$/i
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specs = dependency.matching_specs
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selected = specs.max_by { |s| s.version }
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return Gem::RemoteFetcher.fetcher.download_to_cache(dependency) unless
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selected
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return unless dependency.name =~ /^#{selected.name}$/i
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# We expect to find (basename).gem in the 'cache' directory. Furthermore,
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# the name match must be exact (ignoring case).
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path = find_in_cache File.basename selected.cache_file
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return Gem::RemoteFetcher.fetcher.download_to_cache(dependency) unless path
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path
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end
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end
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