Show role hierarchy for Ansible

deps.rb

#!/usr/bin/env ruby

require 'yaml'

PLAYS_DIR = '.'
ROLES_DIR = './roles'

def deps_of(role)
  dep_path = File.join(ROLES_DIR, "#{role}/meta/main.yml")
  File.exists?(dep_path) ? (YAML.load_file(dep_path)['dependencies'] || []) : []
end

def print_role_deps(role, indent = 0)
  puts "#{' ' * indent}#{role}"
  deps_of(role).each do |subrole|
    print_role_deps(subrole, indent + 2)
  end
end

root_roles = Dir[File.join(PLAYS_DIR, '*.yml')].map do |playbook|
  YAML.load_file(playbook).map do |play|
    next if play['roles'].nil?
    play['roles'].map do |role|
      role.is_a?(Hash) ? role['role'] : role
    end
  end.flatten
end.flatten.compact.uniq.sort

root_roles.each do |role|
  print_role_deps(role)
end

output.txt

$ ./deps.rb
admins
builder
common
  admins
  ruby
  nodejs
  whenever
    ruby
  newrelic
drone
  docker
elasticsearch
  java