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# frozen_string_literal: true
require 'tsort'
##
# A RequestSet groups a request to activate a set of dependencies.
#
# nokogiri = Gem::Dependency.new 'nokogiri', '~> 1.6'
# pg = Gem::Dependency.new 'pg', '~> 0.14'
#
# set = Gem::RequestSet.new nokogiri, pg
#
# requests = set.resolve
#
# p requests.map { |r| r.full_name }
# #=> ["nokogiri-1.6.0", "mini_portile-0.5.1", "pg-0.17.0"]
class Gem::RequestSet
include TSort
##
# Array of gems to install even if already installed
attr_accessor :always_install
attr_reader :dependencies
attr_accessor :development
##
# Errors fetching gems during resolution.
attr_reader :errors
##
# Set to true if you want to install only direct development dependencies.
attr_accessor :development_shallow
##
# The set of git gems imported via load_gemdeps.
attr_reader :git_set # :nodoc:
##
# When true, dependency resolution is not performed, only the requested gems
# are installed.
attr_accessor :ignore_dependencies
attr_reader :install_dir # :nodoc:
##
# If true, allow dependencies to match prerelease gems.
attr_accessor :prerelease
##
# When false no remote sets are used for resolving gems.
attr_accessor :remote
attr_reader :resolver # :nodoc:
##
# Sets used for resolution
attr_reader :sets # :nodoc:
##
# Treat missing dependencies as silent errors
attr_accessor :soft_missing
##
# The set of vendor gems imported via load_gemdeps.
attr_reader :vendor_set # :nodoc:
##
# The set of source gems imported via load_gemdeps.
attr_reader :source_set
##
# Creates a RequestSet for a list of Gem::Dependency objects, +deps+. You
# can then #resolve and #install the resolved list of dependencies.
#
# nokogiri = Gem::Dependency.new 'nokogiri', '~> 1.6'
# pg = Gem::Dependency.new 'pg', '~> 0.14'
#
# set = Gem::RequestSet.new nokogiri, pg
def initialize(*deps)
@dependencies = deps
@always_install = []
@conservative = false
@dependency_names = {}
@development = false
@development_shallow = false
@errors = []
@git_set = nil
@ignore_dependencies = false
@install_dir = Gem.dir
@prerelease = false
@remote = true
@requests = []
@sets = []
@soft_missing = false
@sorted = nil
@specs = nil
@vendor_set = nil
@source_set = nil
yield self if block_given?
end
##
# Declare that a gem of name +name+ with +reqs+ requirements is needed.
def gem(name, *reqs)
if dep = @dependency_names[name]
dep.requirement.concat reqs
else
dep = Gem::Dependency.new name, *reqs
@dependency_names[name] = dep
@dependencies << dep
end
end
##
# Add +deps+ Gem::Dependency objects to the set.
def import(deps)
@dependencies.concat deps
end
##
# Installs gems for this RequestSet using the Gem::Installer +options+.
#
# If a +block+ is given an activation +request+ and +installer+ are yielded.
# The +installer+ will be +nil+ if a gem matching the request was already
# installed.
def install(options, &block) # :yields: request, installer
if dir = options[:install_dir]
requests = install_into dir, false, options, &block
return requests
end
@prerelease = options[:prerelease]
requests = []
download_queue = Queue.new
# Create a thread-safe list of gems to download
sorted_requests.each do |req|
download_queue << req
end
# Create N threads in a pool, have them download all the gems
threads = Gem.configuration.concurrent_downloads.times.map do
# When a thread pops this item, it knows to stop running. The symbol
# is queued here so that there will be one symbol per thread.
download_queue << :stop
Thread.new do
# The pop method will block waiting for items, so the only way
# to stop a thread from running is to provide a final item that
# means the thread should stop.
while req = download_queue.pop
break if req == :stop
req.spec.download options unless req.installed?
end
end
end
# Wait for all the downloads to finish before continuing
threads.each(&:value)
# Install requested gems after they have been downloaded
sorted_requests.each do |req|
if req.installed?
req.spec.spec.build_extensions
if @always_install.none? { |spec| spec == req.spec.spec }
yield req, nil if block_given?
next
end
end
spec =
begin
req.spec.install options do |installer|
yield req, installer if block_given?
end
rescue Gem::RuntimeRequirementNotMetError => e
recent_match = req.spec.set.find_all(req.request).sort_by(&:version).reverse_each.find do |s|
s = s.spec
s.required_ruby_version.satisfied_by?(Gem.ruby_version) &&
s.required_rubygems_version.satisfied_by?(Gem.rubygems_version) &&
Gem::Platform.installable?(s)
end
if recent_match
suggestion = "The last version of #{req.request} to support your Ruby & RubyGems was #{recent_match.version}. Try installing it with `gem install #{recent_match.name} -v #{recent_match.version}`"
suggestion += " and then running the current command again" unless @always_install.include?(req.spec.spec)
else
suggestion = "There are no versions of #{req.request} compatible with your Ruby & RubyGems"
suggestion += ". Maybe try installing an older version of the gem you're looking for?" unless @always_install.include?(req.spec.spec)
end
e.suggestion = suggestion
raise
end
requests << spec
end
return requests if options[:gemdeps]
install_hooks requests, options
requests
end
##
# Installs from the gem dependencies files in the +:gemdeps+ option in
# +options+, yielding to the +block+ as in #install.
#
# If +:without_groups+ is given in the +options+, those groups in the gem
# dependencies file are not used. See Gem::Installer for other +options+.
def install_from_gemdeps(options, &block)
gemdeps = options[:gemdeps]
@install_dir = options[:install_dir] || Gem.dir
@prerelease = options[:prerelease]
@remote = options[:domain] != :local
@conservative = true if options[:conservative]
gem_deps_api = load_gemdeps gemdeps, options[:without_groups], true
resolve
if options[:explain]
puts "Gems to install:"
sorted_requests.each do |spec|
puts " #{spec.full_name}"
end
if Gem.configuration.really_verbose
@resolver.stats.display
end
else
installed = install options, &block
if options.fetch :lock, true
lockfile =
Gem::RequestSet::Lockfile.build self, gemdeps, gem_deps_api.dependencies
lockfile.write
end
installed
end
end
def install_into(dir, force = true, options = {})
gem_home, ENV['GEM_HOME'] = ENV['GEM_HOME'], dir
existing = force ? [] : specs_in(dir)
existing.delete_if { |s| @always_install.include? s }
dir = File.expand_path dir
installed = []
options[:development] = false
options[:install_dir] = dir
options[:only_install_dir] = true
@prerelease = options[:prerelease]
sorted_requests.each do |request|
spec = request.spec
if existing.find { |s| s.full_name == spec.full_name }
yield request, nil if block_given?
next
end
spec.install options do |installer|
yield request, installer if block_given?
end
installed << request
end
install_hooks installed, options
installed
ensure
ENV['GEM_HOME'] = gem_home
end
##
# Call hooks on installed gems
def install_hooks(requests, options)
specs = requests.map do |request|
case request
when Gem::Resolver::ActivationRequest then
request.spec.spec
else
request
end
end
require "rubygems/dependency_installer"
inst = Gem::DependencyInstaller.new options
inst.installed_gems.replace specs
Gem.done_installing_hooks.each do |hook|
hook.call inst, specs
end unless Gem.done_installing_hooks.empty?
end
##
# Load a dependency management file.
def load_gemdeps(path, without_groups = [], installing = false)
@git_set = Gem::Resolver::GitSet.new
@vendor_set = Gem::Resolver::VendorSet.new
@source_set = Gem::Resolver::SourceSet.new
@git_set.root_dir = @install_dir
lock_file = "#{File.expand_path(path)}.lock".dup.tap(&Gem::UNTAINT)
begin
tokenizer = Gem::RequestSet::Lockfile::Tokenizer.from_file lock_file
parser = tokenizer.make_parser self, []
parser.parse
rescue Errno::ENOENT
end
gf = Gem::RequestSet::GemDependencyAPI.new self, path
gf.installing = installing
gf.without_groups = without_groups if without_groups
gf.load
end
def pretty_print(q) # :nodoc:
q.group 2, '[RequestSet:', ']' do
q.breakable
if @remote
q.text 'remote'
q.breakable
end
if @prerelease
q.text 'prerelease'
q.breakable
end
if @development_shallow
q.text 'shallow development'
q.breakable
elsif @development
q.text 'development'
q.breakable
end
if @soft_missing
q.text 'soft missing'
end
q.group 2, '[dependencies:', ']' do
q.breakable
@dependencies.map do |dep|
q.text dep.to_s
q.breakable
end
end
q.breakable
q.text 'sets:'
q.breakable
q.pp @sets.map { |set| set.class }
end
end
##
# Resolve the requested dependencies and return an Array of Specification
# objects to be activated.
def resolve(set = Gem::Resolver::BestSet.new)
@sets << set
@sets << @git_set
@sets << @vendor_set
@sets << @source_set
set = Gem::Resolver.compose_sets(*@sets)
set.remote = @remote
set.prerelease = @prerelease
resolver = Gem::Resolver.new @dependencies, set
resolver.development = @development
resolver.development_shallow = @development_shallow
resolver.ignore_dependencies = @ignore_dependencies
resolver.soft_missing = @soft_missing
if @conservative
installed_gems = {}
Gem::Specification.find_all do |spec|
(installed_gems[spec.name] ||= []) << spec
end
resolver.skip_gems = installed_gems
end
@resolver = resolver
@requests = resolver.resolve
@errors = set.errors
@requests
end
##
# Resolve the requested dependencies against the gems available via Gem.path
# and return an Array of Specification objects to be activated.
def resolve_current
resolve Gem::Resolver::CurrentSet.new
end
def sorted_requests
@sorted ||= strongly_connected_components.flatten
end
def specs
@specs ||= @requests.map { |r| r.full_spec }
end
def specs_in(dir)
Gem::Util.glob_files_in_dir("*.gemspec", File.join(dir, "specifications")).map do |g|
Gem::Specification.load g
end
end
def tsort_each_node(&block) # :nodoc:
@requests.each(&block)
end
def tsort_each_child(node) # :nodoc:
node.spec.dependencies.each do |dep|
next if dep.type == :development and not @development
match = @requests.find do |r|
dep.match? r.spec.name, r.spec.version, @prerelease
end
unless match
next if dep.type == :development and @development_shallow
next if @soft_missing
raise Gem::DependencyError,
"Unresolved dependency found during sorting - #{dep} (requested by #{node.spec.full_name})"
end
yield match
end
end
end
require 'rubygems/request_set/gem_dependency_api'
require 'rubygems/request_set/lockfile'
require 'rubygems/request_set/lockfile/tokenizer'
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