* lib/rubygems: Update to RubyGems master 4bdc4f2. Important changes

  in this commit:

  RubyGems now chooses the test server port reliably.  Patch by akr.

  Partial implementation of bundler's Gemfile format.

  Refactorings to improve the new resolver.

  Fixes bugs in the resolver.

* test/rubygems:  Tests for the above.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43643 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

18 files changed, 403 insertions, 157 deletions

diff --git a/lib/rubygems/dependency_resolver/activation_request.rb b/lib/rubygems/dependency_resolver/activation_request.rb
index 25af6378ac..c5d1e24d85 100644
--- a/lib/rubygems/dependency_resolver/activation_request.rb
+++ b/lib/rubygems/dependency_resolver/activation_request.rb
@@ -47,11 +47,21 @@ class Gem::DependencyResolver::ActivationRequest
   end
 
   def inspect # :nodoc:
-    others_possible = nil
-    others_possible = ' (others possible)' if @others_possible
+    others =
+      case @others_possible
+      when true then # TODO remove at RubyGems 3
+        ' (others possible)'
+      when false then # TODO remove at RubyGems 3
+        nil
+      else
+        unless @others_possible.empty? then
+          others = @others_possible.map { |s| s.full_name }
+          " (others possible: #{others.join ', '})"
+        end
+      end
 
     '#<%s for %p from %s%s>' % [
-      self.class, @spec, @request, others_possible
+      self.class, @spec, @request, others
     ]
   end
 
@@ -59,10 +69,15 @@ class Gem::DependencyResolver::ActivationRequest
   # Indicates if the requested gem has already been installed.
 
   def installed?
-    this_spec = full_spec
+    case @spec
+    when Gem::DependencyResolver::VendorSpecification then
+      true
+    else
+      this_spec = full_spec
 
-    Gem::Specification.any? do |s|
-      s == this_spec
+      Gem::Specification.any? do |s|
+        s == this_spec
+      end
     end
   end
 
@@ -75,7 +90,12 @@ class Gem::DependencyResolver::ActivationRequest
   # requests for the same Dependency request.
 
   def others_possible?
-    @others_possible
+    case @others_possible
+    when true, false then
+      @others_possible
+    else
+      not @others_possible.empty?
+    end
   end
 
   ##
@@ -95,9 +115,18 @@ class Gem::DependencyResolver::ActivationRequest
       q.text ' for '
       q.pp @request
 
-
-      q.breakable
-      q.text ' (other possible)' if @others_possible
+      case @others_possible
+      when false then
+      when true then
+        q.breakable
+        q.text 'others possible'
+      else
+        unless @others_possible.empty? then
+          q.breakable
+          q.text 'others '
+          q.pp @others_possible.map { |s| s.full_name }
+        end
+      end
     end
   end
 
diff --git a/lib/rubygems/dependency_resolver/api_set.rb b/lib/rubygems/dependency_resolver/api_set.rb
index 469c005a09..9dd34562b1 100644
--- a/lib/rubygems/dependency_resolver/api_set.rb
+++ b/lib/rubygems/dependency_resolver/api_set.rb
@@ -2,11 +2,21 @@
 # The global rubygems pool, available via the rubygems.org API.
 # Returns instances of APISpecification.
 
-class Gem::DependencyResolver::APISet
+class Gem::DependencyResolver::APISet < Gem::DependencyResolver::Set
 
-  def initialize
+  ##
+  # The URI for the dependency API this APISet uses.
+
+  attr_reader :dep_uri # :nodoc:
+
+  ##
+  # Creates a new APISet that will retrieve gems from +uri+ using the RubyGems
+  # API described at http://guides.rubygems.org/rubygems-org-api
+
+  def initialize uri = 'https://rubygems.org/api/v1/dependencies'
+    uri = URI uri unless URI === uri # for ruby 1.8
     @data = Hash.new { |h,k| h[k] = [] }
-    @dep_uri = URI 'https://rubygems.org/api/v1/dependencies'
+    @dep_uri = uri
   end
 
   ##
@@ -46,7 +56,7 @@ class Gem::DependencyResolver::APISet
   ##
   # Return data for all versions of the gem +name+.
 
-  def versions name
+  def versions name # :nodoc:
     if @data.key?(name)
       return @data[name]
     end
diff --git a/lib/rubygems/dependency_resolver/api_specification.rb b/lib/rubygems/dependency_resolver/api_specification.rb
index ae688780dd..5178d7c28e 100644
--- a/lib/rubygems/dependency_resolver/api_specification.rb
+++ b/lib/rubygems/dependency_resolver/api_specification.rb
@@ -1,18 +1,21 @@
 ##
-# Represents a specification retrieved via the rubygems.org
-# API. This is used to avoid having to load the full
-# Specification object when all we need is the name, version,
-# and dependencies.
+# Represents a specification retrieved via the rubygems.org API.
+#
+# This is used to avoid loading the full Specification object when all we need
+# is the name, version, and dependencies.
 
-class Gem::DependencyResolver::APISpecification
+class Gem::DependencyResolver::APISpecification < Gem::DependencyResolver::Specification
 
-  attr_reader :dependencies
-  attr_reader :name
-  attr_reader :platform
-  attr_reader :set # :nodoc:
-  attr_reader :version
+  ##
+  # Creates an APISpecification for the given +set+ from the rubygems.org
+  # +api_data+.
+  #
+  # See http://guides.rubygems.org/rubygems-org-api/#misc_methods for the
+  # format of the +api_data+.
 
   def initialize(set, api_data)
+    super()
+
     @set = set
     @name = api_data[:name]
     @version = Gem::Version.new api_data[:number]
@@ -31,9 +34,5 @@ class Gem::DependencyResolver::APISpecification
       @dependencies == other.dependencies
   end
 
-  def full_name
-    "#{@name}-#{@version}"
-  end
-
 end
 
diff --git a/lib/rubygems/dependency_resolver/best_set.rb b/lib/rubygems/dependency_resolver/best_set.rb
new file mode 100644
index 0000000000..987eea552e
--- /dev/null
+++ b/lib/rubygems/dependency_resolver/best_set.rb
@@ -0,0 +1,21 @@
+##
+# The BestSet chooses the best available method to query a remote index.
+#
+# It combines IndexSet and APISet
+
+class Gem::DependencyResolver::BestSet < Gem::DependencyResolver::ComposedSet
+
+  ##
+  # Creates a BestSet for the given +sources+ or Gem::sources if none are
+  # specified.  +sources+ must be a Gem::SourceList.
+
+  def initialize sources = Gem.sources
+    super()
+
+    sources.each_source do |source|
+      @sets << source.dependency_resolver_set
+    end
+  end
+
+end
+
diff --git a/lib/rubygems/dependency_resolver/composed_set.rb b/lib/rubygems/dependency_resolver/composed_set.rb
index fb38128bb0..aeecf047b8 100644
--- a/lib/rubygems/dependency_resolver/composed_set.rb
+++ b/lib/rubygems/dependency_resolver/composed_set.rb
@@ -1,4 +1,6 @@
-class Gem::DependencyResolver::ComposedSet
+class Gem::DependencyResolver::ComposedSet < Gem::DependencyResolver::Set
+
+  attr_reader :sets # :nodoc:
 
   def initialize *sets
     @sets = sets
diff --git a/lib/rubygems/dependency_resolver/current_set.rb b/lib/rubygems/dependency_resolver/current_set.rb
index 13bc490e9e..ef15c9d7f3 100644
--- a/lib/rubygems/dependency_resolver/current_set.rb
+++ b/lib/rubygems/dependency_resolver/current_set.rb
@@ -3,14 +3,11 @@
 # all the normal settings that control where to look
 # for installed gems.
 
-class Gem::DependencyResolver::CurrentSet
+class Gem::DependencyResolver::CurrentSet < Gem::DependencyResolver::Set
 
   def find_all req
     req.dependency.matching_specs
   end
 
-  def prefetch gems
-  end
-
 end
 
diff --git a/lib/rubygems/dependency_resolver/dependency_conflict.rb b/lib/rubygems/dependency_resolver/dependency_conflict.rb
index 1755d910c3..092f000cdb 100644
--- a/lib/rubygems/dependency_resolver/dependency_conflict.rb
+++ b/lib/rubygems/dependency_resolver/dependency_conflict.rb
@@ -8,12 +8,21 @@ class Gem::DependencyResolver::DependencyConflict
 
   attr_reader :dependency
 
+  attr_reader :failed_dep # :nodoc:
+
   def initialize(dependency, activated, failed_dep=dependency)
     @dependency = dependency
     @activated = activated
     @failed_dep = failed_dep
   end
 
+  def == other
+    self.class === other and
+      @dependency == other.dependency and
+      @activated  == other.activated  and
+      @failed_dep == other.failed_dep
+  end
+
   ##
   # Return the 2 dependency objects that conflicted
 
@@ -71,6 +80,8 @@ class Gem::DependencyResolver::DependencyConflict
       current = current.request.requester
     end
 
+    path = ['user request (gem command or Gemfile)'] if path.empty?
+
     path
   end
 
diff --git a/lib/rubygems/dependency_resolver/dependency_request.rb b/lib/rubygems/dependency_resolver/dependency_request.rb
index 05e447c3be..36b77ab558 100644
--- a/lib/rubygems/dependency_resolver/dependency_request.rb
+++ b/lib/rubygems/dependency_resolver/dependency_request.rb
@@ -32,6 +32,22 @@ class Gem::DependencyResolver::DependencyRequest
     @dependency.name
   end
 
+  # Indicate that the request is for a gem explicitly requested by the user
+  def explicit?
+    @requester.nil?
+  end
+
+  # Indicate that the requset is for a gem requested as a dependency of another gem
+  def implicit?
+    !explicit?
+  end
+
+  # Return a String indicating who caused this request to be added (only
+  # valid for implicit requests)
+  def request_context
+    @requester ? @requester.request : "(unknown)"
+  end
+
   def pretty_print q # :nodoc:
     q.group 2, '[Dependency request ', ']' do
       q.breakable
@@ -43,6 +59,10 @@ class Gem::DependencyResolver::DependencyRequest
     end
   end
 
+  def requirement
+    @dependency.requirement
+  end
+
   def to_s # :nodoc:
     @dependency.to_s
   end
diff --git a/lib/rubygems/dependency_resolver/index_set.rb b/lib/rubygems/dependency_resolver/index_set.rb
index 8c8bc4319d..04d6ec816f 100644
--- a/lib/rubygems/dependency_resolver/index_set.rb
+++ b/lib/rubygems/dependency_resolver/index_set.rb
@@ -2,10 +2,17 @@
 # The global rubygems pool represented via the traditional
 # source index.
 
-class Gem::DependencyResolver::IndexSet
+class Gem::DependencyResolver::IndexSet < Gem::DependencyResolver::Set
 
-  def initialize
-    @f = Gem::SpecFetcher.fetcher
+  def initialize source = nil # :nodoc:
+    @f =
+      if source then
+        sources = Gem::SourceList.from [source]
+
+        Gem::SpecFetcher.new sources
+      else
+        Gem::SpecFetcher.fetcher
+      end
 
     @all = Hash.new { |h,k| h[k] = [] }
 
@@ -39,26 +46,5 @@ class Gem::DependencyResolver::IndexSet
     res
   end
 
-  ##
-  # Called from IndexSpecification to get a true Specification
-  # object.
-
-  def load_spec name, ver, platform, source
-    key = "#{name}-#{ver}-#{platform}"
-
-    @specs.fetch key do
-      tuple = Gem::NameTuple.new name, ver, platform
-
-      @specs[key] = source.fetch_spec tuple
-    end
-  end
-
-  ##
-  # No prefetching needed since we load the whole index in
-  # initially.
-
-  def prefetch gems
-  end
-
 end
 
diff --git a/lib/rubygems/dependency_resolver/index_specification.rb b/lib/rubygems/dependency_resolver/index_specification.rb
index 6cf267dac1..9b4057f0c8 100644
--- a/lib/rubygems/dependency_resolver/index_specification.rb
+++ b/lib/rubygems/dependency_resolver/index_specification.rb
@@ -3,17 +3,20 @@
 # delay needed to download full Specification objects when only the +name+
 # and +version+ are needed.
 
-class Gem::DependencyResolver::IndexSpecification
+class Gem::DependencyResolver::IndexSpecification < Gem::DependencyResolver::Specification
 
-  attr_reader :name
-
-  attr_reader :platform
-
-  attr_reader :source
-
-  attr_reader :version
+  ##
+  # An IndexSpecification is created from the index format described in `gem
+  # help generate_index`.
+  #
+  # The +set+ contains other specifications for this (URL) +source+.
+  #
+  # The +name+, +version+ and +platform+ are the name, version and platform of
+  # the gem.
 
   def initialize set, name, version, source, platform
+    super()
+
     @set = set
     @name = name
     @version = version
@@ -23,14 +26,13 @@ class Gem::DependencyResolver::IndexSpecification
     @spec = nil
   end
 
+  ##
+  # The dependencies of the gem for this specification
+
   def dependencies
     spec.dependencies
   end
 
-  def full_name
-    "#{@name}-#{@version}"
-  end
-
   def inspect # :nodoc:
     '#<%s %s source %s>' % [self.class, full_name, @source]
   end
@@ -51,8 +53,16 @@ class Gem::DependencyResolver::IndexSpecification
     end
   end
 
-  def spec
-    @spec ||= @set.load_spec(@name, @version, @platform, @source)
+  ##
+  # Fetches a Gem::Specification for this IndexSpecification from the #source.
+
+  def spec # :nodoc:
+    @spec ||=
+      begin
+        tuple = Gem::NameTuple.new @name, @version, @platform
+
+        @source.fetch_spec tuple
+      end
   end
 
 end
diff --git a/lib/rubygems/dependency_resolver/installed_specification.rb b/lib/rubygems/dependency_resolver/installed_specification.rb
index ca20ace61e..4b591661a8 100644
--- a/lib/rubygems/dependency_resolver/installed_specification.rb
+++ b/lib/rubygems/dependency_resolver/installed_specification.rb
@@ -1,12 +1,8 @@
-class Gem::DependencyResolver::InstalledSpecification
+##
+# An InstalledSpecification represents a gem that is already installed
+# locally.
 
-  attr_reader :spec
-
-  def initialize set, spec, source=nil
-    @set    = set
-    @source = source
-    @spec   = spec
-  end
+class Gem::DependencyResolver::InstalledSpecification < Gem::DependencyResolver::SpecSpecification
 
   def == other # :nodoc:
     self.class === other and
@@ -14,29 +10,25 @@ class Gem::DependencyResolver::InstalledSpecification
       @spec == other.spec
   end
 
-  def dependencies
-    @spec.dependencies
-  end
-
-  def full_name
-    "#{@spec.name}-#{@spec.version}"
-  end
+  ##
+  # Returns +true+ if this gem is installable for the current platform.
 
-  def name
-    @spec.name
+  def installable_platform?
+    # BACKCOMPAT If the file is coming out of a specified file, then we
+    # ignore the platform. This code can be removed in RG 3.0.
+    if @source.kind_of? Gem::Source::SpecificFile
+      return true
+    else
+      Gem::Platform.match @spec.platform
+    end
   end
 
-  def platform
-    @spec.platform
-  end
+  ##
+  # The source for this specification
 
   def source
     @source ||= Gem::Source::Installed.new
   end
 
-  def version
-    @spec.version
-  end
-
 end
 
diff --git a/lib/rubygems/dependency_resolver/installer_set.rb b/lib/rubygems/dependency_resolver/installer_set.rb
index 2993766d3a..801b60a8bb 100644
--- a/lib/rubygems/dependency_resolver/installer_set.rb
+++ b/lib/rubygems/dependency_resolver/installer_set.rb
@@ -2,23 +2,23 @@
 # A set of gems for installation sourced from remote sources and local .gem
 # files
 
-class Gem::DependencyResolver::InstallerSet
+class Gem::DependencyResolver::InstallerSet < Gem::DependencyResolver::Set
 
   ##
   # List of Gem::Specification objects that must always be installed.
 
-  attr_reader :always_install
+  attr_reader :always_install # :nodoc:
 
   ##
   # Only install gems in the always_install list
 
-  attr_accessor :ignore_dependencies
+  attr_accessor :ignore_dependencies # :nodoc:
 
   ##
   # Do not look in the installed set when finding specifications.  This is
   # used by the --install-dir option to `gem install`
 
-  attr_accessor :ignore_installed
+  attr_accessor :ignore_installed # :nodoc:
 
   def initialize domain
     @domain = domain
@@ -36,14 +36,14 @@ class Gem::DependencyResolver::InstallerSet
   ##
   # Should local gems should be considered?
 
-  def consider_local?
+  def consider_local? # :nodoc:
     @domain == :both or @domain == :local
   end
 
   ##
   # Should remote gems should be considered?
 
-  def consider_remote?
+  def consider_remote? # :nodoc:
     @domain == :both or @domain == :remote
   end
 
@@ -101,7 +101,7 @@ class Gem::DependencyResolver::InstallerSet
   ##
   # Loads remote prerelease specs if +dep+ is a prerelease dependency
 
-  def load_remote_specs dep
+  def load_remote_specs dep # :nodoc:
     types = [:released]
     types << :prerelease if dep.prerelease?
 
@@ -123,7 +123,7 @@ class Gem::DependencyResolver::InstallerSet
   # Called from IndexSpecification to get a true Specification
   # object.
 
-  def load_spec name, ver, platform, source
+  def load_spec name, ver, platform, source # :nodoc:
     key = "#{name}-#{ver}-#{platform}"
 
     @specs.fetch key do
@@ -133,12 +133,6 @@ class Gem::DependencyResolver::InstallerSet
     end
   end
 
-  ##
-  # No prefetching needed since we load the whole index in initially.
-
-  def prefetch(reqs)
-  end
-
   def pretty_print q # :nodoc:
     q.group 2, '[InstallerSet', ']' do
       q.breakable
diff --git a/lib/rubygems/dependency_resolver/lock_set.rb b/lib/rubygems/dependency_resolver/lock_set.rb
new file mode 100644
index 0000000000..f95c7f0fd6
--- /dev/null
+++ b/lib/rubygems/dependency_resolver/lock_set.rb
@@ -0,0 +1,60 @@
+##
+# A set of gems from a gem dependencies lockfile.
+
+class Gem::DependencyResolver::LockSet < Gem::DependencyResolver::Set
+
+  attr_reader :specs # :nodoc:
+
+  ##
+  # Creates a new LockSet from the given +source+
+
+  def initialize source
+    @source = source
+    @specs  = []
+  end
+
+  ##
+  # Creates a new IndexSpecification in this set using the given +name+,
+  # +version+ and +platform+.
+  #
+  # The specification's set will be the current set, and the source will be
+  # the current set's source.
+
+  def add name, version, platform # :nodoc:
+    version = Gem::Version.new version
+
+    spec =
+      Gem::DependencyResolver::IndexSpecification.new self, name, version,
+                                                      @source, platform
+
+    @specs << spec
+  end
+
+  ##
+  # Returns an Array of IndexSpecification objects matching the
+  # DependencyRequest +req+.
+
+  def find_all req
+    @specs.select do |spec|
+      req.matches_spec? spec
+    end
+  end
+
+  ##
+  # Loads a Gem::Specification with the given +name+, +version+ and
+  # +platform+.  +source+ is ignored.
+
+  def load_spec name, version, platform, source # :nodoc:
+    dep = Gem::Dependency.new name, version
+
+    found = @specs.find do |spec|
+      dep.matches_spec? spec and spec.platform == platform
+    end
+
+    tuple = Gem::NameTuple.new found.name, found.version, found.platform
+
+    found.source.fetch_spec tuple
+  end
+
+end
+
diff --git a/lib/rubygems/dependency_resolver/set.rb b/lib/rubygems/dependency_resolver/set.rb
new file mode 100644
index 0000000000..65801871ac
--- /dev/null
+++ b/lib/rubygems/dependency_resolver/set.rb
@@ -0,0 +1,28 @@
+##
+# DependencyResolver sets are used to look up specifications (and their
+# dependencies) used in resolution.  This set is abstract.
+
+class Gem::DependencyResolver::Set
+
+  ##
+  # The find_all method must be implemented.  It returns all
+  # DependencyResolver Specification objects matching the given
+  # DependencyRequest +req+.
+
+  def find_all req
+    raise NotImplementedError
+  end
+
+  ##
+  # The #prefetch method may be overridden, but this is not necessary.  This
+  # default implementation does nothing, which is suitable for sets where
+  # looking up a specification is cheap (such as installed gems).
+  #
+  # When overridden, the #prefetch method should look up specifications
+  # matching +reqs+.
+
+  def prefetch reqs
+  end
+
+end
+
diff --git a/lib/rubygems/dependency_resolver/spec_specification.rb b/lib/rubygems/dependency_resolver/spec_specification.rb
new file mode 100644
index 0000000000..cca1d58b9f
--- /dev/null
+++ b/lib/rubygems/dependency_resolver/spec_specification.rb
@@ -0,0 +1,58 @@
+##
+# The DependencyResolver::SpecSpecification contains common functionality for
+# DependencyResolver specifications that are backed by a Gem::Specification.
+
+class Gem::DependencyResolver::SpecSpecification < Gem::DependencyResolver::Specification
+
+  attr_reader :spec # :nodoc:
+
+  ##
+  # A SpecSpecification is created for a +set+ for a Gem::Specification in
+  # +spec+.  The +source+ is either where the +spec+ came from, or should be
+  # loaded from.
+
+  def initialize set, spec, source = nil
+    @set    = set
+    @source = source
+    @spec   = spec
+  end
+
+  ##
+  # The dependencies of the gem for this specification
+
+  def dependencies
+    spec.dependencies
+  end
+
+  ##
+  # The name and version of the specification.
+  #
+  # Unlike Gem::Specification#full_name, the platform is not included.
+
+  def full_name
+    "#{spec.name}-#{spec.version}"
+  end
+
+  ##
+  # The name of the gem for this specification
+
+  def name
+    spec.name
+  end
+
+  ##
+  # The platform this gem works on.
+
+  def platform
+    spec.platform
+  end
+
+  ##
+  # The version of the gem for this specification.
+
+  def version
+    spec.version
+  end
+
+end
+
diff --git a/lib/rubygems/dependency_resolver/specification.rb b/lib/rubygems/dependency_resolver/specification.rb
new file mode 100644
index 0000000000..6fbd241316
--- /dev/null
+++ b/lib/rubygems/dependency_resolver/specification.rb
@@ -0,0 +1,60 @@
+##
+# A DependencyResolver::Specification contains a subset of the information
+# contained in a Gem::Specification.  Only the information necessary for
+# dependency resolution in the resolver is included.
+
+class Gem::DependencyResolver::Specification
+
+  ##
+  # The dependencies of the gem for this specification
+
+  attr_reader :dependencies
+
+  ##
+  # The name of the gem for this specification
+
+  attr_reader :name
+
+  ##
+  # The platform this gem works on.
+
+  attr_reader :platform
+
+  ##
+  # The set this specification came from.
+
+  attr_reader :set
+
+  ##
+  # The source for this specification
+
+  attr_reader :source
+
+  ##
+  # The version of the gem for this specification.
+
+  attr_reader :version
+
+  ##
+  # Sets default instance variables for the specification.
+
+  def initialize
+    @dependencies = nil
+    @name         = nil
+    @platform     = nil
+    @set          = nil
+    @source       = nil
+    @version      = nil
+  end
+
+  ##
+  # The name and version of the specification.
+  #
+  # Unlike Gem::Specification#full_name, the platform is not included.
+
+  def full_name
+    "#{@name}-#{@version}"
+  end
+
+end
+
diff --git a/lib/rubygems/dependency_resolver/vendor_set.rb b/lib/rubygems/dependency_resolver/vendor_set.rb
index 716c2a8e26..87eb6fd818 100644
--- a/lib/rubygems/dependency_resolver/vendor_set.rb
+++ b/lib/rubygems/dependency_resolver/vendor_set.rb
@@ -13,17 +13,18 @@
 # The directory vendor/rake must contain an unpacked rake gem along with a
 # rake.gemspec (watching the given name).
 
-class Gem::DependencyResolver::VendorSet
+class Gem::DependencyResolver::VendorSet < Gem::DependencyResolver::Set
 
-  def initialize
-    @specs = {}
+  def initialize # :nodoc:
+    @directories = {}
+    @specs       = {}
   end
 
   ##
   # Adds a specification to the set with the given +name+ which has been
   # unpacked into the given +directory+.
 
-  def add_vendor_gem name, directory
+  def add_vendor_gem name, directory # :nodoc:
     gemspec = File.join directory, "#{name}.gemspec"
 
     spec = Gem::Specification.load gemspec
@@ -33,7 +34,8 @@ class Gem::DependencyResolver::VendorSet
 
     key = "#{spec.name}-#{spec.version}-#{spec.platform}"
 
-    @specs[key] = spec
+    @specs[key]        = spec
+    @directories[spec] = directory
   end
 
   ##
@@ -44,7 +46,8 @@ class Gem::DependencyResolver::VendorSet
     @specs.values.select do |spec|
       req.matches_spec? spec
     end.map do |spec|
-      Gem::DependencyResolver::VendorSpecification.new self, spec, nil
+      source = Gem::Source::Vendor.new @directories[spec]
+      Gem::DependencyResolver::VendorSpecification.new self, spec, source
     end
   end
 
@@ -53,17 +56,11 @@ class Gem::DependencyResolver::VendorSet
   # +source+ is defined when the specification was added to index it is not
   # used.
 
-  def load_spec name, version, platform, source
+  def load_spec name, version, platform, source # :nodoc:
     key = "#{name}-#{version}-#{platform}"
 
     @specs.fetch key
   end
 
-  ##
-  # No prefetch is needed as the index is loaded at creation time.
-
-  def prefetch gems
-  end
-
 end
 
diff --git a/lib/rubygems/dependency_resolver/vendor_specification.rb b/lib/rubygems/dependency_resolver/vendor_specification.rb
index 2f18fab4ce..27b2fd6df2 100644
--- a/lib/rubygems/dependency_resolver/vendor_specification.rb
+++ b/lib/rubygems/dependency_resolver/vendor_specification.rb
@@ -1,43 +1,15 @@
-class Gem::DependencyResolver::VendorSpecification
+##
+# A VendorSpecification represents a gem that has been unpacked into a project
+# and is being loaded through a gem dependencies file through the +path:+
+# option.
 
-  attr_reader :spec
-
-  attr_reader :set
-
-  def initialize set, spec, source=nil
-    @set    = set
-    @source = source
-    @spec   = spec
-  end
+class Gem::DependencyResolver::VendorSpecification < Gem::DependencyResolver::SpecSpecification
 
   def == other # :nodoc:
     self.class === other and
       @set  == other.set and
-      @spec == other.spec
-  end
-
-  def dependencies
-    @spec.dependencies
-  end
-
-  def full_name
-    "#{@spec.name}-#{@spec.version}"
-  end
-
-  def name
-    @spec.name
-  end
-
-  def platform
-    @spec.platform
-  end
-
-  def source
-    @source ||= Gem::Source::Vendor.new
-  end
-
-  def version
-    @spec.version
+      @spec == other.spec and
+      @source == other.source
   end
 
 end