How to automatically install Ansible Galaxy roles?

Question

All my Ansible playbooks/roles are checked in to my git repo.

However, for Ansible Galaxy roles I always have to explicitly download them one by one on every machine

Answer 1

Here, my requirements are on the role and used in install.yml

main.yml

 # tasks file for MY_ROLE
- name: Install requirements
  local_action: command ansible-galaxy install -r {{ role_path }}/requirements.yml -p /etc/ansible/roles

- include_tasks: install.yml 

.  
├── playbook.yml  
├── inventory  
├── roles  
│    └── My_Role   
│        ├── tasks  
│        │   └── main.yml  
│        │   └── install.yml  
│        └── requirements.yml