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require 'set'
# This is the latest iteration of the gem dependency resolving algorithm. As of now,
# it can resolve (as a success or failure) any set of gem dependencies we throw at it
# in a reasonable amount of time. The most iterations I've seen it take is about 150.
# The actual implementation of the algorithm is not as good as it could be yet, but that
# can come later.
module Bundler
class Resolver
require 'bundler/vendored_molinillo'
class Molinillo::VersionConflict
def clean_req(req)
if req.to_s.include?(">= 0")
req.to_s.gsub(/ \(.*?\)$/, '')
else
req.to_s.gsub(/\, (runtime|development)\)$/, ')')
end
end
def message
conflicts.values.flatten.reduce('') do |o, conflict|
o << %(Bundler could not find compatible versions for gem "#{conflict.requirement.name}":\n)
if conflict.locked_requirement
o << %( In snapshot (Gemfile.lock):\n)
o << %( #{clean_req conflict.locked_requirement}\n)
o << %(\n)
end
o << %( In Gemfile:\n)
o << conflict.requirement_trees.map do |tree|
t = ''
depth = 2
tree.each do |req|
t << ' ' * depth << %(#{clean_req req})
t << %( depends on) unless tree[-1] == req
t << %(\n)
depth += 1
end
t
end.join("\n")
if conflict.requirement.name == 'bundler'
o << %(\n Current Bundler version:\n bundler (#{Bundler::VERSION}))
other_bundler_required = !conflict.requirement.requirement.satisfied_by?(Gem::Version.new Bundler::VERSION)
end
if conflict.requirement.name == "bundler" && other_bundler_required
o << "\n"
o << "This Gemfile requires a different version of Bundler.\n"
o << "Perhaps you need to update Bundler by running `gem install bundler`?\n"
end
if conflict.locked_requirement
o << "\n"
o << %(Running `bundle update` will rebuild your snapshot from scratch, using only\n)
o << %(the gems in your Gemfile, which may resolve the conflict.\n)
elsif !conflict.existing
if conflict.requirement_trees.first.size > 1
o << "Could not find gem '#{clean_req(conflict.requirement)}', which is required by "
o << "gem '#{clean_req(conflict.requirement_trees.first[-2])}', in any of the sources."
else
o << "Could not find gem '#{clean_req(conflict.requirement)} in any of the sources\n"
end
end
o
end
end
end
ALL = Bundler::Dependency::PLATFORM_MAP.values.uniq.freeze
class SpecGroup < Array
include GemHelpers
attr_reader :activated, :required_by
def initialize(a)
super
@required_by = []
@activated = []
@dependencies = nil
@specs = {}
ALL.each do |p|
@specs[p] = reverse.find { |s| s.match_platform(p) }
end
end
def initialize_copy(o)
super
@required_by = o.required_by.dup
@activated = o.activated.dup
end
def to_specs
specs = {}
@activated.each do |p|
if s = @specs[p]
platform = generic(Gem::Platform.new(s.platform))
next if specs[platform]
lazy_spec = LazySpecification.new(name, version, platform, source)
lazy_spec.dependencies.replace s.dependencies
specs[platform] = lazy_spec
end
end
specs.values
end
def activate_platform(platform)
unless @activated.include?(platform)
if for?(platform)
@activated << platform
return __dependencies[platform] || []
end
end
[]
end
def name
@name ||= first.name
end
def version
@version ||= first.version
end
def source
@source ||= first.source
end
def for?(platform)
@specs[platform]
end
def to_s
"#{name} (#{version})"
end
def dependencies_for_activated_platforms
@activated.map { |p| __dependencies[p] }.flatten
end
def platforms_for_dependency_named(dependency)
__dependencies.select { |p, deps| deps.map(&:name).include? dependency }.keys
end
private
def __dependencies
@dependencies ||= begin
dependencies = {}
ALL.each do |p|
if spec = @specs[p]
dependencies[p] = []
spec.dependencies.each do |dep|
next if dep.type == :development
dependencies[p] << DepProxy.new(dep, p)
end
end
end
dependencies
end
end
end
# Figures out the best possible configuration of gems that satisfies
# the list of passed dependencies and any child dependencies without
# causing any gem activation errors.
#
# ==== Parameters
# *dependencies<Gem::Dependency>:: The list of dependencies to resolve
#
# ==== Returns
# <GemBundle>,nil:: If the list of dependencies can be resolved, a
# collection of gemspecs is returned. Otherwise, nil is returned.
def self.resolve(requirements, index, source_requirements = {}, base = [])
base = SpecSet.new(base) unless base.is_a?(SpecSet)
resolver = new(index, source_requirements, base)
result = resolver.start(requirements)
SpecSet.new(result)
end
def initialize(index, source_requirements, base)
@index = index
@source_requirements = source_requirements
@base = base
@resolver = Molinillo::Resolver.new(self, self)
@search_for = {}
@prereleases_cache = Hash.new { |h,k| h[k] = k.prerelease? }
@base_dg = Molinillo::DependencyGraph.new
@base.each { |ls| @base_dg.add_root_vertex ls.name, Dependency.new(ls.name, ls.version) }
end
def start(requirements)
verify_gemfile_dependencies_are_found!(requirements)
dg = @resolver.resolve(requirements, @base_dg)
dg.map(&:payload).map(&:to_specs).flatten
rescue Molinillo::VersionConflict => e
raise VersionConflict.new(e.conflicts.keys.uniq, e.message)
rescue Molinillo::CircularDependencyError => e
names = e.dependencies.sort_by(&:name).map { |d| "gem '#{d.name}'"}
raise CyclicDependencyError, "Your Gemfile requires gems that depend" \
" on each other, creating an infinite loop. Please remove" \
" #{names.count > 1 ? 'either ' : '' }#{names.join(' or ')}" \
" and try again."
end
include Molinillo::UI
# Conveys debug information to the user.
#
# @param [Integer] depth the current depth of the resolution process.
# @return [void]
def debug(depth = 0)
if debug?
debug_info = yield
debug_info = debug_info.inspect unless debug_info.is_a?(String)
STDERR.puts debug_info.split("\n").map { |s| ' ' * depth + s }
end
end
def debug?
ENV['DEBUG_RESOLVER'] || ENV['DEBUG_RESOLVER_TREE']
end
def before_resolution
Bundler.ui.info 'Resolving dependencies...', false
end
def after_resolution
Bundler.ui.info ''
end
def indicate_progress
Bundler.ui.info '.', false
end
private
include Molinillo::SpecificationProvider
def dependencies_for(specification)
specification.dependencies_for_activated_platforms
end
def search_for(dependency)
platform = dependency.__platform
dependency = dependency.dep unless dependency.is_a? Gem::Dependency
search = @search_for[dependency] ||= begin
index = @source_requirements[dependency.name] || @index
results = index.search(dependency, @base[dependency.name])
if vertex = @base_dg.vertex_named(dependency.name)
locked_requirement = vertex.payload.requirement
end
if results.any?
version = results.first.version
nested = [[]]
results.each do |spec|
if spec.version != version
nested << []
version = spec.version
end
nested.last << spec
end
groups = nested.map { |a| SpecGroup.new(a) }
!locked_requirement ? groups : groups.select { |sg| locked_requirement.satisfied_by? sg.version }
else
[]
end
end
search.select { |sg| sg.for?(platform) }.each { |sg| sg.activate_platform(platform) }
end
def name_for(dependency)
dependency.name
end
def name_for_explicit_dependency_source
'Gemfile'
end
def name_for_locking_dependency_source
'Gemfile.lock'
end
def requirement_satisfied_by?(requirement, activated, spec)
requirement.matches_spec?(spec)
end
def sort_dependencies(dependencies, activated, conflicts)
dependencies.sort_by do |dependency|
name = name_for(dependency)
[
activated.vertex_named(name).payload ? 0 : 1,
@prereleases_cache[dependency.requirement] ? 0 : 1,
conflicts[name] ? 0 : 1,
activated.vertex_named(name).payload ? 0 : search_for(dependency).count,
]
end
end
def verify_gemfile_dependencies_are_found!(requirements)
requirements.each do |requirement|
next if requirement.name == 'bundler'
if search_for(requirement).empty?
if base = @base[requirement.name] and !base.empty?
version = base.first.version
message = "You have requested:\n" \
" #{requirement.name} #{requirement.requirement}\n\n" \
"The bundle currently has #{requirement.name} locked at #{version}.\n" \
"Try running `bundle update #{requirement.name}`"
elsif requirement.source
name = requirement.name
versions = @source_requirements[name][name].map { |s| s.version }
message = "Could not find gem '#{requirement}' in #{requirement.source}.\n"
if versions.any?
message << "Source contains '#{name}' at: #{versions.join(', ')}"
else
message << "Source does not contain any versions of '#{requirement}'"
end
else
message = "Could not find gem '#{requirement}' in any of the gem sources " \
"listed in your Gemfile or available on this machine."
end
raise GemNotFound, message
end
end
end
end
end
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