class Bundler::Definition

def ensure_equivalent_gemfile_and_lockfile(explicit_flag = false)
  return unless Bundler.frozen_bundle?
  raise ProductionError, "Frozen mode is set, but there's no lockfile" unless lockfile_exists?
  added =   []
  deleted = []
  changed = []
  new_platforms = @platforms - @locked_platforms
  deleted_platforms = @locked_platforms - @platforms
  added.concat new_platforms.map {|p| "* platform: #{p}" }
  deleted.concat deleted_platforms.map {|p| "* platform: #{p}" }
  added.concat new_deps.map {|d| "* #{pretty_dep(d)}" } if new_deps.any?
  deleted.concat deleted_deps.map {|d| "* #{pretty_dep(d)}" } if deleted_deps.any?
  both_sources = Hash.new {|h, k| h[k] = [] }
  current_dependencies.each {|d| both_sources[d.name][0] = d }
  current_locked_dependencies.each {|d| both_sources[d.name][1] = d }
  both_sources.each do |name, (dep, lock_dep)|
    next if dep.nil? || lock_dep.nil?
    gemfile_source = dep.source || default_source
    lock_source = lock_dep.source || default_source
    next if lock_source.include?(gemfile_source)
    gemfile_source_name = dep.source ? gemfile_source.to_gemfile : "no specified source"
    lockfile_source_name = lock_dep.source ? lock_source.to_gemfile : "no specified source"
    changed << "* #{name} from `#{lockfile_source_name}` to `#{gemfile_source_name}`"
  end
  reason = nothing_changed? ? "some dependencies were deleted from your gemfile" : change_reason
  msg = String.new
  msg << "#{reason.capitalize.strip}, but the lockfile can't be updated because frozen mode is set"
  msg << "\n\nYou have added to the Gemfile:\n" << added.join("\n") if added.any?
  msg << "\n\nYou have deleted from the Gemfile:\n" << deleted.join("\n") if deleted.any?
  msg << "\n\nYou have changed in the Gemfile:\n" << changed.join("\n") if changed.any?
  msg << "\n\nRun `bundle install` elsewhere and add the updated #{SharedHelpers.relative_gemfile_path} to version control.\n"
  unless explicit_flag
    suggested_command = unless Bundler.settings.locations("frozen").keys.include?(:env)
      "bundle config set frozen false"
    end
    msg << "If this is a development machine, remove the #{SharedHelpers.relative_lockfile_path} " \
           "freeze by running `#{suggested_command}`." if suggested_command
  end
  raise ProductionError, msg if added.any? || deleted.any? || changed.any? || !nothing_changed?
end