Stubbing methods interacting with /etc/passwd

home_dir_spec.rb

describe 'cookbook::recipe' do
  cached(:chef_run) do
    ChefSpec::ServerRunner.new.converge(described_recipe)
  end

  it 'creates home directories' do
    %w[/home/testuser1 /home/testuser2].each do |d|
      expect(chef_run).to create_directory(d)
    end
  end
end

describe 'etc passwd reading' do
  let(:users) do
    [
      ['root', '********', 0, 0, '/root', '/bin/bash'],
      ['testuser1', '********', 1002, 1002, '/home/testuser1', '/bin/bash'],
      ['testuser2', '********', 1003, 1003, '/home/testuser2', '/bin/bash']
    ].map { |u| User.new(*u) }
  end

  before do
    User = Struct.new(:name, :passwd, :uid, :gid, :dir, :shell)
    allow(Etc).to receive(:getpwent).and_return(*users, nil)
  end

  it do
    expect(user_home_dirs).to match_array(%w[/home/testuser1 /home/testuser2])
  end
end

library.rb

module Helper
  module_function
  
  def passwd_users
    Etc.endpwent # ensure we start at the first user
    users = []
    loop do
      user = Etc.getpwent # get the next passwd entry
      puts "user: #{user}"
      break if user.nil? # after all entries have been read nil is returned
      users << user
    end
    users # return the users
  end

  def user_home_dirs
    passwd_users.reject do |user|
      %w[root hault sync shutdown].include?(user.name) ||
      user.dir.include?('/usr/sbin/nologin')
    end.map { |user| user.dir }
  end

end

recipe.rb

user_home_dirs.each do |d|
  directory d do
    action :create
  end
end