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Class: Gem::Commands::PristineCommand

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
Instance Chain:
Inherits: Gem::Command
Defined in: lib/rubygems/commands/pristine_command.rb

Class Attribute Summary

::Gem::Command - Inherited

.build_args

Arguments used when building gems.

.build_args=, .extra_args, .extra_args=

Class Method Summary

::Gem::Command - Inherited

.add_common_option,
.add_specific_extra_args

Add a list of extra arguments for the given command.

.common_options,
.new

Initializes a generic gem command named command.

.specific_extra_args

Return an array of extra arguments for the command.

.specific_extra_args_hash

Accessor for the specific extra args hash (self initializing).

Instance Attribute Summary

::Gem::Command - Inherited

#defaults

The default options for the command.

#program_name

The name of the command for command-line invocation.

#summary

A short description of the command.

#command

The name of the command.

#options

The options for the command.

::Gem::DefaultUserInteraction - Included

Instance Method Summary

::Gem::VersionOption - Included

#add_platform_option

Add the –platform option to the option parser.

#add_prerelease_option

Add the –prerelease option to the option parser.

#add_version_option

Add the –version option to the option parser.

::Gem::Command - Inherited

#add_extra_args

Adds extra args from ~/.gemrc.

#add_option

Add a command-line option and handler to the command.

#arguments

Override to provide details of the arguments a command takes.

#begins?

True if long begins with the characters from short.

#defaults_str

Override to display the default values of the command options.

#description

Override to display a longer description of what this command does.

#execute

Override to provide command handling.

#get_all_gem_names

Get all gem names from the command line.

#get_all_gem_names_and_versions

Get all [gem, version] from the command line.

#get_one_gem_name

Get a single gem name from the command line.

#get_one_optional_argument

Get a single optional argument from the command line.

#handle_options

Handle the given list of arguments by parsing them and recording the results.

#handles?

True if the command handles the given argument list.

#invoke

Invoke the command with the given list of arguments.

#invoke_with_build_args

Invoke the command with the given list of normal arguments and additional build arguments.

#merge_options

Merge a set of command options with the set of default options (without modifying the default option hash).

#remove_option

Remove previously defined command-line argument name.

#show_help

Display the help message for the command.

#show_lookup_failure

Display to the user that a gem couldn't be found and reasons why.

#usage

Override to display the usage for an individual gem command.

#when_invoked

Call the given block when invoked.

#add_parser_run_info

Adds a section with title and content to the parser help view.

#configure_options,
#create_option_parser

Creates an option parser and fills it in with the help info for the command.

#parser

Create on demand parser.

#wrap

Wraps text to width

::Gem::UserInteraction - Included

#alert

Displays an alert statement.

#alert_error

Displays an error statement to the error output location.

#alert_warning

Displays a warning statement to the warning output location.

#ask

Asks a question and returns the answer.

#ask_for_password

Asks for a password with a prompt

#ask_yes_no

Asks a yes or no question.

#choose_from_list

Asks the user to answer question with an answer from the given list.

#say

Displays the given statement on the standard output (or equivalent).

#terminate_interaction

Terminates the RubyGems process with the given exit_code

#verbose

Calls say with msg or the results of the block if really_verbose is true.

::Gem::DefaultUserInteraction - Included

::Gem::Text - Included

#clean_text

Remove any non-printable characters and make the text suitable for printing.

#format_text

Wraps text to wrap characters and optionally indents by indent characters.

#levenshtein_distance

This code is based directly on the ::Gem::Text gem implementation Returns a value representing the “cost” of transforming str1 into str2.

#truncate_text

Constructor Details

.newPristineCommand

[ GitHub ]

  
# File 'lib/rubygems/commands/pristine_command.rb', line 11

def initialize
  super 'pristine',
        'Restores installed gems to pristine condition from files located in the gem cache',
        :version => Gem::Requirement.default,
        :extensions => true,
        :extensions_set => false,
        :all => false

  add_option('--all',
             'Restore all installed gems to pristine',
             'condition') do |value, options|
    options[:all] = value
  end

  add_option('--skip=gem_name',
             'used on --all, skip if name == gem_name') do |value, options|
    options[:skip] = value
  end

  add_option('--[no-]extensions',
             'Restore gems with extensions',
             'in addition to regular gems') do |value, options|
    options[:extensions_set] = true
    options[:extensions]     = value
  end

  add_option('--only-executables',
             'Only restore executables') do |value, options|
    options[:only_executables] = value
  end

  add_option('-E', '--[no-]env-shebang',
             'Rewrite executables with a shebang',
             'of /usr/bin/env') do |value, options|
    options[:env_shebang] = value
  end

  add_version_option('restore to', 'pristine condition')
end

Instance Method Details

#execute

[ GitHub ]

  
# File 'lib/rubygems/commands/pristine_command.rb', line 83

def execute
  specs = if options[:all] then
            Gem::Specification.map

          # `--extensions` must be explicitly given to pristine only gems
          # with extensions.
          elsif options[:extensions_set] and
                options[:extensions] and options[:args].empty? then
            Gem::Specification.select do |spec|
              spec.extensions and not spec.extensions.empty?
            end
          else
            get_all_gem_names.sort.map do |gem_name|
              Gem::Specification.find_all_by_name(gem_name, options[:version]).reverse
            end.flatten
          end

  if specs.to_a.empty? then
    raise Gem::Exception,
          "Failed to find gems #{options[:args]} #{options[:version]}"
  end

  install_dir = Gem.dir # TODO use installer option

  raise Gem::FilePermissionError.new(install_dir) unless
    File.writable?(install_dir)

  say "Restoring gems to pristine condition..."

  specs.each do |spec|
    if spec.default_gem?
      say "Skipped #{spec.full_name}, it is a default gem"
      next
    end

    if spec.name == options[:skip]
      say "Skipped #{spec.full_name}, it was given through options"
      next
    end

    if spec.bundled_gem_in_old_ruby?
      say "Skipped #{spec.full_name}, it is bundled with old Ruby"
      next
    end

    unless spec.extensions.empty? or options[:extensions] then
      say "Skipped #{spec.full_name}, it needs to compile an extension"
      next
    end

    gem = spec.cache_file

    unless File.exist? gem then
      require 'rubygems/remote_fetcher'

      say "Cached gem for #{spec.full_name} not found, attempting to fetch..."

      dep = Gem::Dependency.new spec.name, spec.version
      found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dep

      if found.empty?
        say "Skipped #{spec.full_name}, it was not found from cache and remote sources"
        next
      end

      spec_candidate, source = found.first
      Gem::RemoteFetcher.fetcher.download spec_candidate, source.uri.to_s, spec.base_dir
    end

    env_shebang =
      if options.include? :env_shebang then
        options[:env_shebang]
      else
        install_defaults = Gem::ConfigFile::PLATFORM_DEFAULTS['install']
        install_defaults.to_s['--env-shebang']
      end

    installer = Gem::Installer.at(gem,
                                   :wrappers => true,
                                   :force => true,
                                   :install_dir => spec.base_dir,
                                   :env_shebang => env_shebang,
                                   :build_args => spec.build_args)

    if options[:only_executables] then
      installer.generate_bin
    else
      installer.install
    end

    say "Restored #{spec.full_name}"
  end
end