ensure_equivalent_gemfile_and_lockfile

# File lib/bundler/definition.rb, line 392
    def ensure_equivalent_gemfile_and_lockfile(explicit_flag = false)
      msg = String.new
      msg << "You are trying to install in deployment mode after changing\n"               "your Gemfile. Run `bundle install` elsewhere and add the\n"               "updated #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)} to version control."

      unless explicit_flag
        suggested_command = if Bundler.settings.locations("frozen")[:global]
          "bundle config --delete frozen"
        elsif Bundler.settings.locations("deployment").keys.&([:global, :local]).any?
          "bundle config --delete deployment"
        else
          "bundle install --no-deployment"
        end
        msg << "\n\nIf this is a development machine, remove the #{Bundler.default_gemfile} "                 "freeze \nby running `#{suggested_command}`."
      end

      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}" }

      gemfile_sources = sources.lock_sources

      new_sources = gemfile_sources - @locked_sources
      deleted_sources = @locked_sources - gemfile_sources

      new_deps = @dependencies - @locked_deps.values
      deleted_deps = @locked_deps.values - @dependencies

      # Check if it is possible that the source is only changed thing
      if (new_deps.empty? && deleted_deps.empty?) && (!new_sources.empty? && !deleted_sources.empty?)
        new_sources.reject! {|source| (source.path? && source.path.exist?) || equivalent_rubygems_remotes?(source) }
        deleted_sources.reject! {|source| (source.path? && source.path.exist?) || equivalent_rubygems_remotes?(source) }
      end

      if @locked_sources != gemfile_sources
        if new_sources.any?
          added.concat new_sources.map {|source| "* source: #{source}" }
        end

        if deleted_sources.any?
          deleted.concat deleted_sources.map {|source| "* source: #{source}" }
        end
      end

      added.concat new_deps.map {|d| "* #{pretty_dep(d)}" } if new_deps.any?
      if deleted_deps.any?
        deleted.concat deleted_deps.map {|d| "* #{pretty_dep(d)}" }
      end

      both_sources = Hash.new {|h, k| h[k] = [] }
      @dependencies.each {|d| both_sources[d.name][0] = d }
      @locked_deps.each  {|name, d| both_sources[name][1] = d.source }

      both_sources.each do |name, (dep, lock_source)|
        next unless (dep.nil? && !lock_source.nil?) || (!dep.nil? && !lock_source.nil? && !lock_source.can_lock?(dep))
        gemfile_source_name = (dep && dep.source) || "no specified source"
        lockfile_source_name = lock_source || "no specified source"
        changed << "* #{name} from `#{gemfile_source_name}` to `#{lockfile_source_name}`"
      end

      reason = change_reason
      msg << "\n\n#{reason.split(", ").map(&:capitalize).join("\n")}" unless reason.strip.empty?
      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"

      raise ProductionError, msg if added.any? || deleted.any? || changed.any? || !nothing_changed?
    end