관리-도구

편집 파일: pristine_command.rb

require 'rubygems/command'
require 'rubygems/package'
require 'rubygems/installer'
require 'rubygems/version_option'

class Gem::Commands::PristineCommand < Gem::Command

include Gem::VersionOption

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

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

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

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

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

def arguments # :nodoc:
    "GEMNAME       gem to restore to pristine condition (unless --all)"
  end

def defaults_str # :nodoc:
    '--extensions'
  end

def description # :nodoc:
    <<-EOF
The pristine command compares an installed gem with the contents of its
cached .gem file and restores any files that don't match the cached .gem's
copy.

If you have made modifications to an installed gem, the pristine command
will revert them.  All extensions are rebuilt and all bin stubs for the gem
are regenerated after checking for modifications.

If the cached gem cannot be found it will be downloaded.

If --no-extensions is provided pristine will not attempt to restore a gem
with an extension.
    EOF
  end

def usage # :nodoc:
    "#{program_name} [GEMNAME ...]"
  end

def execute
    specs = if options[:all] then
              Gem::Specification.map
            else
              get_all_gem_names.map do |gem_name|
                Gem::Specification.find_all_by_name gem_name, options[:version]
              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

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
        Gem::RemoteFetcher.fetcher.download_to_cache dep
      end

# TODO use installer options
      install_defaults = Gem::ConfigFile::PLATFORM_DEFAULTS['install']
      installer_env_shebang = install_defaults.to_s['--env-shebang']

installer = Gem::Installer.new(gem,
                                     :wrappers => true,
                                     :force => true,
                                     :install_dir => spec.base_dir,
                                     :env_shebang => installer_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
end