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Edit: /opt/alt/ruby22/lib64/ruby/2.2.0/rubygems/resolver/installer_set.rb

##
# A set of gems for installation sourced from remote sources and local .gem
# files

class Gem::Resolver::InstallerSet < Gem::Resolver::Set

##
  # List of Gem::Specification objects that must always be installed.

attr_reader :always_install # :nodoc:

##
  # Only install gems in the always_install list

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 # :nodoc:

##
  # The remote_set looks up remote gems for installation.

attr_reader :remote_set # :nodoc:

##
  # Creates a new InstallerSet that will look for gems in +domain+.

def initialize domain
    super()

@domain = domain
    @remote = consider_remote?

@f = Gem::SpecFetcher.fetcher

@always_install      = []
    @ignore_dependencies = false
    @ignore_installed    = false
    @local               = {}
    @remote_set          = Gem::Resolver::BestSet.new
    @specs               = {}
  end

##
  # Looks up the latest specification for +dependency+ and adds it to the
  # always_install list.

def add_always_install dependency
    request = Gem::Resolver::DependencyRequest.new dependency, nil

found = find_all request

found.delete_if { |s|
      s.version.prerelease? and not s.local?
    } unless dependency.prerelease?

found = found.select do |s|
      Gem::Source::SpecificFile === s.source or
        Gem::Platform::RUBY == s.platform or
        Gem::Platform.local === s.platform
    end

if found.empty? then
      exc = Gem::UnsatisfiableDependencyError.new request
      exc.errors = errors

raise exc
    end

newest = found.max_by do |s|
      [s.version, s.platform == Gem::Platform::RUBY ? -1 : 1]
    end

@always_install << newest.spec
  end

##
  # Adds a local gem requested using +dep_name+ with the given +spec+ that can
  # be loaded and installed using the +source+.

def add_local dep_name, spec, source
    @local[dep_name] = [spec, source]
  end

##
  # Should local gems should be considered?

def consider_local? # :nodoc:
    @domain == :both or @domain == :local
  end

##
  # Should remote gems should be considered?

def consider_remote? # :nodoc:
    @domain == :both or @domain == :remote
  end

##
  # Errors encountered while resolving gems

def errors
    @errors + @remote_set.errors
  end

##
  # Returns an array of IndexSpecification objects matching DependencyRequest
  # +req+.

def find_all req
    res = []

dep  = req.dependency

return res if @ignore_dependencies and
              @always_install.none? { |spec| dep.match? spec }

name = dep.name

dep.matching_specs.each do |gemspec|
      next if @always_install.any? { |spec| spec.name == gemspec.name }

res << Gem::Resolver::InstalledSpecification.new(self, gemspec)
    end unless @ignore_installed

if consider_local? then
      matching_local = @local.values.select do |spec, _|
        req.match? spec
      end.map do |spec, source|
        Gem::Resolver::LocalSpecification.new self, spec, source
      end

res.concat matching_local

local_source = Gem::Source::Local.new

if local_spec = local_source.find_gem(name, dep.requirement) then
        res << Gem::Resolver::IndexSpecification.new(
          self, local_spec.name, local_spec.version,
          local_source, local_spec.platform)
      end
    end

res.delete_if do |spec|
      spec.version.prerelease? and not dep.prerelease?
    end

res.concat @remote_set.find_all req if consider_remote?

res
  end

def prefetch(reqs)
    @remote_set.prefetch(reqs) if consider_remote?
  end

def prerelease= allow_prerelease
    super

@remote_set.prerelease = allow_prerelease
  end

def inspect # :nodoc:
    always_install = @always_install.map { |s| s.full_name }

'#<%s domain: %s specs: %p always install: %p>' % [
      self.class, @domain, @specs.keys, always_install,
    ]
  end

##
  # Called from IndexSpecification to get a true Specification
  # object.

def load_spec name, ver, platform, source # :nodoc:
    key = "#{name}-#{ver}-#{platform}"

@specs.fetch key do
      tuple = Gem::NameTuple.new name, ver, platform

@specs[key] = source.fetch_spec tuple
    end
  end

##
  # Has a local gem for +dep_name+ been added to this set?

def local? dep_name # :nodoc:
    spec, = @local[dep_name]

spec
  end

def pretty_print q # :nodoc:
    q.group 2, '[InstallerSet', ']' do
      q.breakable
      q.text "domain: #{@domain}"

q.breakable
      q.text 'specs: '
      q.pp @specs.keys

q.breakable
      q.text 'always install: '
      q.pp @always_install
    end
  end

def remote= remote # :nodoc:
    case @domain
    when :local then
      @domain = :both if remote
    when :remote then
      @domain = nil unless remote
    when :both then
      @domain = :local unless remote
    end
  end

end

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