# File lib/rubygems/commands/check_command.rb, line 9
 9:   def initialize
10:     super 'check', 'Check installed gems',
11:           :verify => false, :alien => false
12: 
13:     add_option(      '--verify FILE',
14:                'Verify gem file against its internal',
15:                'checksum') do |value, options|
16:       options[:verify] = value
17:     end
18: 
19:     add_option('-a', '--alien', "Report 'unmanaged' or rogue files in the",
20:                "gem repository") do |value, options|
21:       options[:alien] = true
22:     end
23: 
24:     add_version_option 'check'
25:   end

    # File lib/rubygems/commands/check_command.rb, line 27
27:   def execute
28:     if options[:alien]
29:       say "Performing the 'alien' operation"
30:       say
31:       gems = get_all_gem_names rescue []
32:       Gem::Validator.new.alien(gems).sort.each do |key, val|
33:         unless val.empty? then
34:           say "#{key} has #{val.size} problems"
35:           val.each do |error_entry|
36:             say "  #{error_entry.path}:"
37:             say "    #{error_entry.problem}"
38:           end
39:         else
40:           say "#{key} is error-free" if Gem.configuration.verbose
41:         end
42:         say
43:       end
44:     end
45: 
46:     if options[:verify]
47:       gem_name = options[:verify]
48:       unless gem_name
49:         alert_error "Must specify a .gem file with --verify NAME"
50:         return
51:       end
52:       unless File.exist?(gem_name)
53:         alert_error "Unknown file: #{gem_name}."
54:         return
55:       end
56:       say "Verifying gem: '#{gem_name}'"
57:       begin
58:         Gem::Validator.new.verify_gem_file(gem_name)
59:       rescue Exception
60:         alert_error "#{gem_name} is invalid."
61:       end
62:     end
63:   end