/usr/lib/python2.7/dist-packages/charmtools/templates/chef/files/cookbooks/Gemfile is in charm-tools 2.1.2-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | source "https://rubygems.org"
gem 'chef', '~> 11.6.0'
gem 'activesupport', '~> 4.0.0'
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