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File Name : unpack_command.rb

# frozen_string_literal: true
require 'rubygems/command'
require 'rubygems/installer'
require 'rubygems/version_option'
require 'rubygems/security_option'
require 'rubygems/remote_fetcher'

# forward-declare

module Gem::Security # :nodoc:
  class Policy # :nodoc:
  end
end

class Gem::Commands::UnpackCommand < Gem::Command

include Gem::VersionOption
  include Gem::SecurityOption

def initialize
    require 'fileutils'

super 'unpack', 'Unpack an installed gem to the current directory',
          :version => Gem::Requirement.default,
          :target  => Dir.pwd

add_option('--target=DIR',
               'target directory for unpacking') do |value, options|
      options[:target] = value
    end

add_option('--spec', 'unpack the gem specification') do |value, options|
      options[:spec] = true
    end

add_security_option
    add_version_option
  end

def arguments # :nodoc:
    "GEMNAME       name of gem to unpack"
  end

def defaults_str # :nodoc:
    "--version '#{Gem::Requirement.default}'"
  end

def description
    <<-EOF
The unpack command allows you to examine the contents of a gem or modify
them to help diagnose a bug.

You can add the contents of the unpacked gem to the load path using the
RUBYLIB environment variable or -I:

$ gem unpack my_gem
  Unpacked gem: '.../my_gem-1.0'
  [edit my_gem-1.0/lib/my_gem.rb]
  $ ruby -Imy_gem-1.0/lib -S other_program

You can repackage an unpacked gem using the build command.  See the build
command help for an example.
    EOF
  end

def usage # :nodoc:
    "#{program_name} GEMNAME"
  end

#--
  # TODO: allow, e.g., 'gem unpack rake-0.3.1'.  Find a general solution for
  # this, so that it works for uninstall as well.  (And check other commands
  # at the same time.)

def execute
    security_policy = options[:security_policy]

get_all_gem_names.each do |name|
      dependency = Gem::Dependency.new name, options[:version]
      path = get_path dependency

unless path
        alert_error "Gem '#{name}' not installed nor fetchable."
        next
      end

if @options[:spec]
        spec, metadata = get_metadata path, security_policy

if metadata.nil?
          alert_error "--spec is unsupported on '#{name}' (old format gem)"
          next
        end

spec_file = File.basename spec.spec_file

FileUtils.mkdir_p @options[:target] if @options[:target]

destination = begin
          if @options[:target]
            File.join @options[:target], spec_file
          else
            spec_file
          end
        end

File.open destination, 'w' do |io|
          io.write metadata
        end
      else
        basename = File.basename path, '.gem'
        target_dir = File.expand_path basename, options[:target]

package = Gem::Package.new path, security_policy
        package.extract_files target_dir

say "Unpacked gem: '#{target_dir}'"
      end
    end
  end

##
  #
  # Find cached filename in Gem.path. Returns nil if the file cannot be found.
  #
  #--
  # TODO: see comments in get_path() about general service.

def find_in_cache(filename)
    Gem.path.each do |path|
      this_path = File.join(path, "cache", filename)
      return this_path if File.exist? this_path
    end

return nil
  end

##
  # Return the full path to the cached gem file matching the given
  # name and version requirement.  Returns 'nil' if no match.
  #
  # Example:
  #
  #   get_path 'rake', '> 0.4' # "/usr/lib/ruby/gems/1.8/cache/rake-0.4.2.gem"
  #   get_path 'rake', '< 0.1' # nil
  #   get_path 'rak'           # nil (exact name required)
  #--
  # TODO: This should be refactored so that it's a general service. I don't
  # think any of our existing classes are the right place though.  Just maybe
  # 'Cache'?
  #
  # TODO: It just uses Gem.dir for now.  What's an easy way to get the list of
  # source directories?

def get_path(dependency)
    return dependency.name if dependency.name =~ /\.gem$/i

specs = dependency.matching_specs

selected = specs.max_by { |s| s.version }

return Gem::RemoteFetcher.fetcher.download_to_cache(dependency) unless
      selected

return unless dependency.name =~ /^#{selected.name}$/i

# We expect to find (basename).gem in the 'cache' directory.  Furthermore,
    # the name match must be exact (ignoring case).

path = find_in_cache File.basename selected.cache_file

return Gem::RemoteFetcher.fetcher.download_to_cache(dependency) unless path

path
  end

##
  # Extracts the Gem::Specification and raw metadata from the .gem file at
  # +path+.
  #--
  # TODO move to Gem::Package as #raw_spec or something

def get_metadata(path, security_policy = nil)
    format = Gem::Package.new path, security_policy
    spec = format.spec

metadata = nil

File.open path, Gem.binary_mode do |io|
      tar = Gem::Package::TarReader.new io
      tar.each_entry do |entry|
        case entry.full_name
        when 'metadata' then
          metadata = entry.read
        when 'metadata.gz' then
          metadata = Gem::Util.gunzip entry.read
        end
      end
    end

return spec, metadata
  end

end

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-11-16 11:28:30
..	dir	-	0755	2025-11-16 11:28:30
build_command.rb	file	2.03 KB	0644	2022-04-12 11:50:11
cert_command.rb	file	9.02 KB	0644	2022-04-12 11:50:11
check_command.rb	file	2.23 KB	0644	2022-04-12 11:50:11
cleanup_command.rb	file	4.48 KB	0644	2022-04-12 11:50:11
contents_command.rb	file	4.07 KB	0644	2022-04-12 11:50:11
dependency_command.rb	file	5.14 KB	0644	2022-04-12 11:50:11
environment_command.rb	file	5.16 KB	0644	2022-04-12 11:50:11
fetch_command.rb	file	1.77 KB	0644	2022-04-12 11:50:11
generate_index_command.rb	file	2.55 KB	0644	2022-04-12 11:50:11
help_command.rb	file	10.14 KB	0644	2022-04-12 11:50:11
info_command.rb	file	713 B	0644	2022-04-12 11:50:11
install_command.rb	file	8.4 KB	0644	2022-04-12 11:50:11
list_command.rb	file	939 B	0644	2022-04-12 11:50:11
lock_command.rb	file	2.69 KB	0644	2022-04-12 11:50:11
mirror_command.rb	file	624 B	0644	2022-04-12 11:50:11
open_command.rb	file	1.96 KB	0644	2022-04-12 11:50:11
outdated_command.rb	file	852 B	0644	2022-04-12 11:50:11
owner_command.rb	file	2.82 KB	0644	2022-04-12 11:50:11
pristine_command.rb	file	5.39 KB	0644	2022-04-12 11:50:11
push_command.rb	file	3.53 KB	0644	2022-04-12 11:50:11
query_command.rb	file	9.28 KB	0644	2022-04-12 11:50:11
rdoc_command.rb	file	2.47 KB	0644	2022-04-12 11:50:11
search_command.rb	file	884 B	0644	2022-04-12 11:50:11
server_command.rb	file	2.38 KB	0644	2022-04-12 11:50:11
setup_command.rb	file	17.81 KB	0644	2022-04-12 11:50:11
signin_command.rb	file	890 B	0644	2022-04-12 11:50:11
signout_command.rb	file	896 B	0644	2022-04-12 11:50:11
sources_command.rb	file	5.18 KB	0644	2022-04-12 11:50:11
specification_command.rb	file	3.27 KB	0644	2022-04-12 11:50:11
stale_command.rb	file	962 B	0644	2022-04-12 11:50:11
uninstall_command.rb	file	5.41 KB	0644	2022-04-12 11:50:11
unpack_command.rb	file	5.07 KB	0644	2022-04-12 11:50:11
update_command.rb	file	6.99 KB	0644	2022-04-12 11:50:11
which_command.rb	file	2.15 KB	0644	2022-04-12 11:50:11
yank_command.rb	file	2.29 KB	0644	2022-04-12 11:50:11