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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>C///</title>
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# frozen_string_literal: true
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require 'rubygems/package'
require 'rubygems/installer'

##
# Validator performs various gem file and gem database validation

class Gem::Validator

  include Gem::UserInteraction

  def initialize # :nodoc:
    require 'find'
  end

  private

  def find_files_for_gem(gem_directory)
    installed_files = []

    Find.find gem_directory do |file_name|
      fn = file_name[gem_directory.size..file_name.size - 1].sub(/^\//, "")
      installed_files << fn unless
        fn =~ /CVS/ || fn.empty? || File.directory?(file_name)
    end

    installed_files
  end

  public

  ##
  # Describes a problem with a file in a gem.

  ErrorData = Struct.new :path, :problem do
    def <=>(other) # :nodoc:
      return nil unless self.class === other

      [path, problem] <=> [other.path, other.problem]
    end
  end

  ##
  # Checks the gem directory for the following potential
  # inconsistencies/problems:
  #
  # * Checksum gem itself
  # * For each file in each gem, check consistency of installed versions
  # * Check for files that aren't part of the gem but are in the gems directory
  # * 1 cache - 1 spec - 1 directory.
  #
  # returns a hash of ErrorData objects, keyed on the problem gem's name.
  #--
  # TODO needs further cleanup

  def alien(gems=[])
    errors = Hash.new { |h,k| h[k] = {} }

    Gem::Specification.each do |spec|
      next unless gems.include? spec.name unless gems.empty?
      next if spec.default_gem?

      gem_name      = spec.file_name
      gem_path      = spec.cache_file
      spec_path     = spec.spec_file
      gem_directory = spec.full_gem_path

      unless File.directory? gem_directory
        errors[gem_name][spec.full_name] =
          "Gem registered but doesn't exist at #{gem_directory}"
        next
      end

      unless File.exist? spec_path
        er