This Chef Cookbook metadata.rb example reads the dependencies from Berksfile.lock. (Experimental)

Chef-metadata-environment-pattern.rb

# metadata.rb

# This metadata.rb example reads the dependencies from Berksfile.lock. This can
# be used to implement the Environment Pattern with Chef Server.
#
# The Environment Cookbook:
# http://blog.vialstudios.com/the-environment-cookbook-pattern/

name 'my_face'
# [...]
description 'Installs My Face'
long_description IO.read(File.join(File.dirname(__FILE__), 'README.md'))

# This version must be in sync with Berksfile.lock:
# Use `$ berks update my_face` in each version bump.
version '0.1.0'

def knife_upload?
  self.class.name == 'Chef::Cookbook::Metadata'
end

def berkshelf_load
  require 'berkshelf'
rescue LoadError
  raise 'You need to install Berkshelf. You can use `$ gem install berkshelf`.'
end

def berks_upload?
  # TODO: Find a more elegant solution
  $LOADED_FEATURES
    .select { |f| f.include? '/gems/' }
    .reduce(false) do |memo, f|
      memo || !f.match(/berkshelf\/uploader\.rb$/).nil?
    end
end

def berksfile_lock
  ::File.join(::File.dirname(__FILE__), Berkshelf::Lockfile::DEFAULT_FILENAME)
    .tap do |file|
      next if ::File.exist?(file)
      fail 'Berkshelf lock file not found. You need to run `$ berks install`.'
    end
end

# Dependcies read from Berkshelf in berks install/update
if !knife_upload? && !berks_upload?
  depends 'vialstudios-base', '~> 0.1.0'
  depends 'nginx', '~> 2.7'
  depends 'postgres', '~> 2.11'
  depends 'rbenv', '~> 1.7'
# Outside Berkshelf, when uploading to Chef Server using knife or berks upload
else
  # Read dependencies from Berksfile.lock
  berkshelf_load
  lockfile = Berkshelf::Lockfile.from_file(berksfile_lock)
  lockfile.parse
  lockfile.locks.each do |name, lock|
    next if name.match(/_test$/) # Skip "_test" cookbooks used by test-kitchen
    depends name, "= #{lock.locked_version}"
  end
end