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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