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Edit: /opt/alt/ruby26/lib64/ruby/2.6.0/rubygems/commands/generate_index_command.rb

# frozen_string_literal: true
require 'rubygems/command'
require 'rubygems/indexer'

##
# Generates a index files for use as a gem server.
#
# See `gem help generate_index`

class Gem::Commands::GenerateIndexCommand < Gem::Command

def initialize
    super 'generate_index',
          'Generates the index files for a gem server directory',
          :directory => '.', :build_modern => true

add_option '-d', '--directory=DIRNAME',
               'repository base dir containing gems subdir' do |dir, options|
      options[:directory] = File.expand_path dir
    end

add_option '--[no-]modern',
               'Generate indexes for RubyGems',
               '(always true)' do |value, options|
      options[:build_modern] = value
    end

add_option '--update',
               'Update modern indexes with gems added',
               'since the last update' do |value, options|
      options[:update] = value
    end
  end

def defaults_str # :nodoc:
    "--directory . --modern"
  end

def description # :nodoc:
    <<-EOF
The generate_index command creates a set of indexes for serving gems
statically.  The command expects a 'gems' directory under the path given to
the --directory option.  The given directory will be the directory you serve
as the gem repository.

For `gem generate_index --directory /path/to/repo`, expose /path/to/repo via
your HTTP server configuration (not /path/to/repo/gems).

When done, it will generate a set of files like this:

gems/*.gem                                   # .gem files you want to
                                               # index

specs.<version>.gz                           # specs index
  latest_specs.<version>.gz                    # latest specs index
  prerelease_specs.<version>.gz                # prerelease specs index
  quick/Marshal.<version>/<gemname>.gemspec.rz # Marshal quick index file

The .rz extension files are compressed with the inflate algorithm.
The Marshal version number comes from ruby's Marshal::MAJOR_VERSION and
Marshal::MINOR_VERSION constants.  It is used to ensure compatibility.
    EOF
  end

def execute
    # This is always true because it's the only way now.
    options[:build_modern] = true

if not File.exist?(options[:directory]) or
       not File.directory?(options[:directory])
      alert_error "unknown directory name #{options[:directory]}."
      terminate_interaction 1
    else
      indexer = Gem::Indexer.new options.delete(:directory), options

if options[:update]
        indexer.update_index
      else
        indexer.generate_index
      end
    end
  end

end

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