Class: Bundler::Resolver

Inherits:
Object
  • Object
show all
Includes:
GemHelpers, Molinillo::SpecificationProvider, Molinillo::UI
Defined in:
lib/bundler/resolver.rb,
lib/bundler/resolver/spec_group.rb

Defined Under Namespace

Classes: SpecGroup

Constant Summary

Constants included from GemHelpers

GemHelpers::GENERICS, GemHelpers::GENERIC_CACHE

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Molinillo::SpecificationProvider

#allow_missing?

Methods included from Molinillo::UI

#output, #progress_rate

Methods included from GemHelpers

generic, generic_local_platform, local_platform, platform_specificity_match, same_deps, same_specificity, select_best_platform_match

Constructor Details

#initialize(source_requirements, base, gem_version_promoter, additional_base_requirements, platforms) ⇒ Resolver

Returns a new instance of Resolver.


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# File 'lib/bundler/resolver.rb', line 27

def initialize(source_requirements, base, gem_version_promoter, additional_base_requirements, platforms)
  @source_requirements = source_requirements
  @base = base
  @resolver = Molinillo::Resolver.new(self, self)
  @search_for = {}
  @base_dg = Molinillo::DependencyGraph.new
  aggregate_global_source = @source_requirements[:default].is_a?(Source::RubygemsAggregate)
  @base.each do |ls|
    dep = Dependency.new(ls.name, ls.version)
    ls.source = source_for(ls.name) unless aggregate_global_source
    @base_dg.add_vertex(ls.name, DepProxy.get_proxy(dep, ls.platform), true)
  end
  additional_base_requirements.each {|d| @base_dg.add_vertex(d.name, d) }
  @platforms = platforms.reject {|p| p != Gem::Platform::RUBY && (platforms - [p]).any? {|pl| generic(pl) == p } }
  @resolving_only_for_ruby = platforms == [Gem::Platform::RUBY]
  @gem_version_promoter = gem_version_promoter
  @use_gvp = Bundler.feature_flag.use_gem_version_promoter_for_major_updates? || !@gem_version_promoter.major?
end

Class Method Details

.platform_sort_key(platform) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 219

def self.platform_sort_key(platform)
  # Prefer specific platform to not specific platform
  return ["99-LAST", "", "", ""] if Gem::Platform::RUBY == platform
  ["00", *platform.to_a.map {|part| part || "" }]
end

.resolve(requirements, source_requirements = {}, base = [], gem_version_promoter = GemVersionPromoter.new, additional_base_requirements = [], platforms = nil) ⇒ Object

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.

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# File 'lib/bundler/resolver.rb', line 20

def self.resolve(requirements, source_requirements = {}, base = [], gem_version_promoter = GemVersionPromoter.new, additional_base_requirements = [], platforms = nil)
  base = SpecSet.new(base) unless base.is_a?(SpecSet)
  resolver = new(source_requirements, base, gem_version_promoter, additional_base_requirements, platforms)
  result = resolver.start(requirements)
  SpecSet.new(SpecSet.new(result).for(requirements.reject{|dep| dep.name.end_with?("\0") }))
end

Instance Method Details

#after_resolutionObject


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# File 'lib/bundler/resolver.rb', line 95

def after_resolution
  Bundler.ui.info ""
end

#before_resolutionObject


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# File 'lib/bundler/resolver.rb', line 91

def before_resolution
  Bundler.ui.info "Resolving dependencies...", debug?
end

#debug(depth = 0) ⇒ void

This method returns an undefined value.

Conveys debug information to the user.

Parameters:

  • depth (Integer) (defaults to: 0)

    the current depth of the resolution process.


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# File 'lib/bundler/resolver.rb', line 74

def debug(depth = 0)
  return unless debug?
  debug_info = yield
  debug_info = debug_info.inspect unless debug_info.is_a?(String)
  puts debug_info.split("\n").map {|s| depth == 0 ? "BUNDLER: #{s}" : "BUNDLER(#{depth}): #{s}" }
end

#debug?Boolean

Returns:

  • (Boolean)

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# File 'lib/bundler/resolver.rb', line 81

def debug?
  return @debug_mode if defined?(@debug_mode)
  @debug_mode =
    ENV["BUNDLER_DEBUG_RESOLVER"] ||
    ENV["BUNDLER_DEBUG_RESOLVER_TREE"] ||
    ENV["DEBUG_RESOLVER"] ||
    ENV["DEBUG_RESOLVER_TREE"] ||
    false
end

#dependencies_equal?(dependencies, other_dependencies) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/bundler/resolver.rb', line 199

def dependencies_equal?(dependencies, other_dependencies)
  dependencies.map(&:dep) == other_dependencies.map(&:dep)
end

#dependencies_for(specification) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 105

def dependencies_for(specification)
  specification.dependencies_for_activated_platforms
end

#index_for(dependency) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 167

def index_for(dependency)
  source_for(dependency.name).specs
end

#indicate_progressObject


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# File 'lib/bundler/resolver.rb', line 99

def indicate_progress
  Bundler.ui.info ".", false unless debug?
end

#name_for(dependency) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 179

def name_for(dependency)
  dependency.name
end

#name_for_explicit_dependency_sourceObject


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# File 'lib/bundler/resolver.rb', line 183

def name_for_explicit_dependency_source
  Bundler.default_gemfile.basename.to_s
rescue StandardError
  "Gemfile"
end

#name_for_locking_dependency_sourceObject


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# File 'lib/bundler/resolver.rb', line 189

def name_for_locking_dependency_source
  Bundler.default_lockfile.basename.to_s
rescue StandardError
  "Gemfile.lock"
end

#requirement_satisfied_by?(requirement, activated, spec) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/bundler/resolver.rb', line 195

def requirement_satisfied_by?(requirement, activated, spec)
  requirement.matches_spec?(spec) || spec.source.is_a?(Source::Gemspec)
end

#results_for(dependency, base) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 175

def results_for(dependency, base)
  index_for(dependency).search(dependency, base)
end

#search_for(dependency_proxy) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 109

def search_for(dependency_proxy)
  platform = dependency_proxy.__platform
  dependency = dependency_proxy.dep
  name = dependency.name
  @search_for[dependency_proxy] ||= begin
    results = results_for(dependency, @base[name])

    if vertex = @base_dg.vertex_named(name)
      locked_requirement = vertex.payload.requirement
    end

    if !@prerelease_specified[name] && (!@use_gvp || locked_requirement.nil?)
      # Move prereleases to the beginning of the list, so they're considered
      # last during resolution.
      pre, results = results.partition {|spec| spec.version.prerelease? }
      results = pre + results
    end

    spec_groups = if results.any?
      nested = []
      results.each do |spec|
        version, specs = nested.last
        if version == spec.version
          specs << spec
        else
          nested << [spec.version, [spec]]
        end
      end
      nested.reduce([]) do |groups, (version, specs)|
        next groups if locked_requirement && !locked_requirement.satisfied_by?(version)

        specs_by_platform = Hash.new do |current_specs, current_platform|
          current_specs[current_platform] = select_best_platform_match(specs, current_platform)
        end

        spec_group_ruby = SpecGroup.create_for(specs_by_platform, [Gem::Platform::RUBY], Gem::Platform::RUBY)
        groups << spec_group_ruby if spec_group_ruby

        next groups if @resolving_only_for_ruby

        spec_group = SpecGroup.create_for(specs_by_platform, @platforms, platform)
        groups << spec_group if spec_group

        groups
      end
    else
      []
    end
    # GVP handles major itself, but it's still a bit risky to trust it with it
    # until we get it settled with new behavior. For 2.x it can take over all cases.
    if !@use_gvp
      spec_groups
    else
      @gem_version_promoter.sort_versions(dependency, spec_groups)
    end
  end
end

#sort_dependencies(dependencies, activated, conflicts) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 203

def sort_dependencies(dependencies, activated, conflicts)
  dependencies.sort_by do |dependency|
    name = name_for(dependency)
    vertex = activated.vertex_named(name)
    [
      @base_dg.vertex_named(name) ? 0 : 1,
      vertex.payload ? 0 : 1,
      vertex.root? ? 0 : 1,
      amount_constrained(dependency),
      conflicts[name] ? 0 : 1,
      vertex.payload ? 0 : search_for(dependency).count,
      self.class.platform_sort_key(dependency.__platform),
    ]
  end
end

#source_for(name) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 171

def source_for(name)
  @source_requirements[name] || @source_requirements[:default]
end

#start(requirements) ⇒ Object


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# File 'lib/bundler/resolver.rb', line 46

def start(requirements)
  @gem_version_promoter.prerelease_specified = @prerelease_specified = {}
  requirements.each {|dep| @prerelease_specified[dep.name] ||= dep.prerelease? }

  verify_gemfile_dependencies_are_found!(requirements)
  dg = @resolver.resolve(requirements, @base_dg)
  dg.
    map(&:payload).
    reject {|sg| sg.name.end_with?("\0") }.
    map(&:to_specs).
    flatten
rescue Molinillo::VersionConflict => e
  message = version_conflict_message(e)
  raise VersionConflict.new(e.conflicts.keys.uniq, message)
rescue Molinillo::CircularDependencyError => e
  names = e.dependencies.sort_by(&:name).map {|d| "gem '#{d.name}'" }
  raise CyclicDependencyError, "Your bundle requires gems that depend" \
    " on each other, creating an infinite loop. Please remove" \
    " #{names.count > 1 ? "either " : ""}#{names.join(" or ")}" \
    " and try again."
end