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authorJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-16 18:49:26 +0900
committerJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-30 00:39:06 +0900
commitfcbf63e62c627deae76c1b8cb8c0876c536ed811 (patch)
tree64cb17de3f41a2b6fef2368028fbd00349946994 /jni/ruby/lib/rubygems/commands/unpack_command.rb
Fresh start
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+require 'rubygems/command'
+require 'rubygems/installer'
+require 'rubygems/version_option'
+require 'rubygems/remote_fetcher'
+
+class Gem::Commands::UnpackCommand < Gem::Command
+
+ include Gem::VersionOption
+
+ def initialize
+ require 'fileutils'
+
+ super 'unpack', 'Unpack an installed gem to the current directory',
+ :version => Gem::Requirement.default,
+ :target => Dir.pwd
+
+ add_option('--target=DIR',
+ 'target directory for unpacking') do |value, options|
+ options[:target] = value
+ end
+
+ add_option('--spec', 'unpack the gem specification') do |value, options|
+ options[:spec] = true
+ end
+
+ add_version_option
+ end
+
+ def arguments # :nodoc:
+ "GEMNAME name of gem to unpack"
+ end
+
+ def defaults_str # :nodoc:
+ "--version '#{Gem::Requirement.default}'"
+ end
+
+ def description
+ <<-EOF
+The unpack command allows you to examine the contents of a gem or modify
+them to help diagnose a bug.
+
+You can add the contents of the unpacked gem to the load path using the
+RUBYLIB environment variable or -I:
+
+ $ gem unpack my_gem
+ Unpacked gem: '.../my_gem-1.0'
+ [edit my_gem-1.0/lib/my_gem.rb]
+ $ ruby -Imy_gem-1.0/lib -S other_program
+
+You can repackage an unpacked gem using the build command. See the build
+command help for an example.
+ EOF
+ end
+
+ def usage # :nodoc:
+ "#{program_name} GEMNAME"
+ end
+
+ #--
+ # TODO: allow, e.g., 'gem unpack rake-0.3.1'. Find a general solution for
+ # this, so that it works for uninstall as well. (And check other commands
+ # at the same time.)
+
+ def execute
+ get_all_gem_names.each do |name|
+ dependency = Gem::Dependency.new name, options[:version]
+ path = get_path dependency
+
+ unless path then
+ alert_error "Gem '#{name}' not installed nor fetchable."
+ next
+ end
+
+ if @options[:spec] then
+ spec, metadata = get_metadata path
+
+ if metadata.nil? then
+ alert_error "--spec is unsupported on '#{name}' (old format gem)"
+ next
+ end
+
+ spec_file = File.basename spec.spec_file
+
+ open spec_file, 'w' do |io|
+ io.write metadata
+ end
+ else
+ basename = File.basename path, '.gem'
+ target_dir = File.expand_path basename, options[:target]
+
+ package = Gem::Package.new path
+ package.extract_files target_dir
+
+ say "Unpacked gem: '#{target_dir}'"
+ end
+ end
+ end
+
+ ##
+ #
+ # Find cached filename in Gem.path. Returns nil if the file cannot be found.
+ #
+ #--
+ # TODO: see comments in get_path() about general service.
+
+ def find_in_cache(filename)
+ Gem.path.each do |path|
+ this_path = File.join(path, "cache", filename)
+ return this_path if File.exist? this_path
+ end
+
+ return nil
+ end
+
+ ##
+ # Return the full path to the cached gem file matching the given
+ # name and version requirement. Returns 'nil' if no match.
+ #
+ # Example:
+ #
+ # get_path 'rake', '> 0.4' # "/usr/lib/ruby/gems/1.8/cache/rake-0.4.2.gem"
+ # get_path 'rake', '< 0.1' # nil
+ # get_path 'rak' # nil (exact name required)
+ #--
+ # TODO: This should be refactored so that it's a general service. I don't
+ # think any of our existing classes are the right place though. Just maybe
+ # 'Cache'?
+ #
+ # TODO: It just uses Gem.dir for now. What's an easy way to get the list of
+ # source directories?
+
+ def get_path dependency
+ return dependency.name if dependency.name =~ /\.gem$/i
+
+ specs = dependency.matching_specs
+
+ selected = specs.max_by { |s| s.version }
+
+ return Gem::RemoteFetcher.fetcher.download_to_cache(dependency) unless
+ selected
+
+ return unless dependency.name =~ /^#{selected.name}$/i
+
+ # We expect to find (basename).gem in the 'cache' directory. Furthermore,
+ # the name match must be exact (ignoring case).
+
+ path = find_in_cache File.basename selected.cache_file
+
+ return Gem::RemoteFetcher.fetcher.download_to_cache(dependency) unless path
+
+ path
+ end
+
+ ##
+ # Extracts the Gem::Specification and raw metadata from the .gem file at
+ # +path+.
+ #--
+ # TODO move to Gem::Package as #raw_spec or something
+
+ def get_metadata path
+ format = Gem::Package.new path
+ spec = format.spec
+
+ metadata = nil
+
+ open path, Gem.binary_mode do |io|
+ tar = Gem::Package::TarReader.new io
+ tar.each_entry do |entry|
+ case entry.full_name
+ when 'metadata' then
+ metadata = entry.read
+ when 'metadata.gz' then
+ metadata = Gem.gunzip entry.read
+ end
+ end
+ end
+
+ return spec, metadata
+ end
+
+end
+