class Bundler::Definition

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
    msg << "\n\nIf this is a development machine, remove the #{Bundler.default_gemfile} " \
           "freeze \nby running `bundle install --no-deployment`."
  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
  deleted_deps = @locked_deps - @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.is_a_path? && source.path.exist? }
    deleted_sources.reject! {|source| source.is_a_path? && source.path.exist? }
  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  {|d| both_sources[d.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
  msg << "\n\n#{change_reason.split(", ").join("\n")}\n"
  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