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unpack_command.rb

# frozen_string_literal: true

require_relative "../command"
require_relative "../version_option"
require_relative "../security_option"
require_relative "../remote_fetcher"
require_relative "../package"

# 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 = Gem::Package.raw_spec(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 = if @options[:target]
          File.join @options[:target], spec_file
        else
          spec_file
        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

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 /\.gem$/i.match?(dependency.name)

specs = dependency.matching_specs

selected = specs.max_by(&:version)

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

return unless /^#{selected.name}$/i.match?(dependency.name)

# 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
end

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2026-04-28 09:57:28
..	dir	-	root/linksafe	0755	2026-04-28 09:57:28
build_command.rb	text/x-ruby	2.93 KB	root/linksafe	0644	2026-04-07 01:52:24
cert_command.rb	text/x-ruby	9.13 KB	root/linksafe	0644	2026-04-07 01:52:24
check_command.rb	text/x-ruby	2.29 KB	root/linksafe	0644	2026-04-07 01:52:24
cleanup_command.rb	text/x-ruby	4.27 KB	root/linksafe	0644	2026-04-07 01:52:24
contents_command.rb	text/x-ruby	4.32 KB	root/linksafe	0644	2026-04-07 01:52:24
dependency_command.rb	text/x-ruby	5.08 KB	root/linksafe	0644	2026-04-07 01:52:24
environment_command.rb	text/x-ruby	5.22 KB	root/linksafe	0644	2026-04-07 01:52:24
exec_command.rb	text/x-ruby	6.56 KB	root/linksafe	0644	2026-04-07 01:52:24
fetch_command.rb	text/x-ruby	2.65 KB	root/linksafe	0644	2026-04-07 01:52:24
generate_index_command.rb	text/x-ruby	1.73 KB	root/linksafe	0644	2026-04-07 01:52:24
help_command.rb	text/x-ruby	10.16 KB	root/linksafe	0644	2026-04-07 01:52:24
info_command.rb	text/x-ruby	834 B	root/linksafe	0644	2026-04-07 01:52:24
install_command.rb	text/x-ruby	7.29 KB	root/linksafe	0644	2026-04-07 01:52:24
list_command.rb	text/x-ruby	997 B	root/linksafe	0644	2026-04-07 01:52:24
lock_command.rb	text/x-ruby	2.69 KB	root/linksafe	0644	2026-04-07 01:52:24
mirror_command.rb	text/x-ruby	627 B	root/linksafe	0644	2026-04-07 01:52:24
open_command.rb	text/x-ruby	1.9 KB	root/linksafe	0644	2026-04-07 01:52:24
outdated_command.rb	text/x-ruby	864 B	root/linksafe	0644	2026-04-07 01:52:24
owner_command.rb	text/x-ruby	3.36 KB	root/linksafe	0644	2026-04-07 01:52:24
pristine_command.rb	text/x-ruby	6.69 KB	root/linksafe	0644	2026-04-07 01:52:24
push_command.rb	text/x-ruby	2.55 KB	root/linksafe	0644	2026-04-07 01:52:24
query_command.rb	text/x-ruby	1.21 KB	root/linksafe	0644	2026-04-07 01:52:24
rdoc_command.rb	text/x-ruby	2.2 KB	root/linksafe	0644	2026-04-07 01:52:24
rebuild_command.rb	text/x-ruby	7.32 KB	root/linksafe	0644	2026-04-07 01:52:24
search_command.rb	text/x-ruby	962 B	root/linksafe	0644	2026-04-07 01:52:24
server_command.rb	text/x-ruby	649 B	root/linksafe	0644	2026-04-07 01:52:24
setup_command.rb	text/x-ruby	17.9 KB	root/linksafe	0644	2026-04-07 01:52:24
signin_command.rb	text/x-ruby	896 B	root/linksafe	0644	2026-04-07 01:52:24
signout_command.rb	text/x-ruby	898 B	root/linksafe	0644	2026-04-07 01:52:24
sources_command.rb	text/x-ruby	5.75 KB	root/linksafe	0644	2026-04-07 01:52:24
specification_command.rb	text/x-ruby	3.46 KB	root/linksafe	0644	2026-04-07 01:52:24
stale_command.rb	text/x-ruby	965 B	root/linksafe	0644	2026-04-07 01:52:24
uninstall_command.rb	text/x-ruby	5.86 KB	root/linksafe	0644	2026-04-07 01:52:24
unpack_command.rb	text/x-ruby	4.41 KB	root/linksafe	0644	2026-04-07 01:52:24
update_command.rb	text/x-ruby	8.56 KB	root/linksafe	0644	2026-04-07 01:52:24
which_command.rb	text/x-ruby	2.09 KB	root/linksafe	0644	2026-04-07 01:52:24
yank_command.rb	text/x-ruby	2.35 KB	root/linksafe	0644	2026-04-07 01:52:24

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