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#--
# 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
    require 'find'
  end

  ##
  # Given a gem file's contents, validates against its own MD5 checksum
  # gem_data:: [String] Contents of the gem file

  def verify_gem(gem_data)
    # TODO remove me? The code here only validate an MD5SUM that was
    # in some old formatted gems, but hasn't been for a long time.
  end

  ##
  # Given the path to a gem file, validates against its own MD5 checksum
  #
  # gem_path:: [String] Path to gem file

  def verify_gem_file(gem_path)
    open gem_path, Gem.binary_mode do |file|
      gem_data = file.read
      verify_gem gem_data
    end
  rescue Errno::ENOENT, Errno::EINVAL
    raise Gem::VerificationError, "missing gem file #{gem_path}"
  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

  ErrorData = Struct.new :path, :problem do
    def <=> other
      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?

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

      unless File.exist? spec_path then
        errors[gem_name][spec_path] = "Spec file missing for installed gem"
      end

      begin
        verify_gem_file(gem_path)

        good, gone, unreadable = nil, nil, nil, nil

        open gem_path, Gem.binary_mode do |file|
          package = Gem::Package.new gem_path

          good, gone = package.contents.partition { |file_name|
            File.exist? File.join(gem_directory, file_name)
          }

          gone.sort.each do |path|
            errors[gem_name][path] = "Missing file"
          end

          good, unreadable = good.partition { |file_name|
            File.readable? File.join(gem_directory, file_name)
          }

          unreadable.sort.each do |path|
            errors[gem_name][path] = "Unreadable file"
          end

          good.each do |entry, data|
            begin
              next unless data # HACK `gem check -a mkrf`

              source = File.join gem_directory, entry['path']

              open source, Gem.binary_mode do |f|
                unless f.read == data then
                  errors[gem_name][entry['path']] = "Modified from original"
                end
              end
            end
          end
        end

        installed_files = find_files_for_gem(gem_directory)
        extras = installed_files - good - unreadable

        extras.each do |extra|
          errors[gem_name][extra] = "Extra file"
        end
      rescue Gem::VerificationError => e
        errors[gem_name][gem_path] = e.message
      end
    end

    errors.each do |name, subhash|
      errors[name] = subhash.map do |path, msg|
        ErrorData.new path, msg
      end.sort
    end

    errors
  end
end

Filemanager

DIR : / usr/ share/ rubygems/ rubygems/
Name Type Size Permission Actions
commands Folder 0755
core_ext Folder 0755
defaults Folder 0755
ext Folder 0755
package Folder 0755
security Folder 0755
ssl_certs Folder 0755
LICENSE.txt File 2.27 KB 0644
available_set.rb File 1.56 KB 0644
command.rb File 13.43 KB 0644
command_manager.rb File 5.36 KB 0644
compatibility.rb File 1.58 KB 0644
config_file.rb File 11.82 KB 0644
defaults.rb File 3.06 KB 0644
dependency.rb File 7.74 KB 0644
dependency_installer.rb File 12.12 KB 0644
dependency_list.rb File 5.53 KB 0644
dependency_resolver.rb File 14.97 KB 0644
deprecate.rb File 1.73 KB 0644
doctor.rb File 2.86 KB 0644
errors.rb File 2.14 KB 0644
exceptions.rb File 2.7 KB 0644
ext.rb File 416 B 0644
gem_runner.rb File 1.98 KB 0644
gemcutter_utilities.rb File 2.91 KB 0644
indexer.rb File 12.89 KB 0644
install_message.rb File 281 B 0644
install_update_options.rb File 5.09 KB 0644
installer.rb File 23.04 KB 0644
installer_test_case.rb File 4.28 KB 0644
local_remote_options.rb File 3.36 KB 0644
mock_gem_ui.rb File 1.35 KB 0644
name_tuple.rb File 1.96 KB 0644
package.rb File 14.38 KB 0644
package_task.rb File 3.77 KB 0644
path_support.rb File 1.58 KB 0644
platform.rb File 5.63 KB 0644
psych_additions.rb File 249 B 0644
psych_tree.rb File 763 B 0644
rdoc.rb File 7.72 KB 0644
remote_fetcher.rb File 15.69 KB 0644
request_set.rb File 3.67 KB 0644
requirement.rb File 6.02 KB 0644
safe_yaml.rb File 1.11 KB 0644
security.rb File 20.56 KB 0644
server.rb File 22.03 KB 0644
source.rb File 3.12 KB 0644
source_list.rb File 1.22 KB 0644
source_local.rb File 1.88 KB 0644
source_specific_file.rb File 552 B 0644
spec_fetcher.rb File 5.17 KB 0644
specification.rb File 68.24 KB 0644
syck_hack.rb File 2.07 KB 0644
test_case.rb File 28.09 KB 0644
test_utilities.rb File 4.03 KB 0644
text.rb File 1.72 KB 0644
uninstaller.rb File 8.32 KB 0644
user_interaction.rb File 11.68 KB 0644
validator.rb File 4.08 KB 0644
version.rb File 10.5 KB 0644
version_option.rb File 1.59 KB 0644