Read a file locally and use the vars remote in Ansible - ansible

Question

I read a YAML file locally with the following playbook:
- name: Ensure the deploy_manifest var is defined and read deploy manifest
hosts: localhost
connection: local
gather_facts: False
tasks:
- assert:
that: deploy_manifest is defined
msg: |
Error: Must provide providers config path. Fix: Add '-e deploy_manifest=/path/to/manifest' to the ansible-playbook command
- name: Read deploy manifest
include_vars:
file: "{{ deploy_manifest }}"
name: manifest
register: manifest
- debug:
msg: "[{{ manifest.key }}]: {{ manifest.value }}"
with_dict: "{{ manifest.ansible_facts }}"
and then in the same playbook YAML file I run:
- name: Deploy Backend services
hosts: backend
remote_user: ubuntu
gather_facts: False
vars:
env: "{{ env }}"
services: "{{ manifest.ansible_facts }}"
tasks:
- include_role:
name: services_backend
when: backend | default(true) | bool
However it doesn't work because debug fails. It says that manifest is empty.
Which is the best way to read a YAML file or generally a configuration in a playbook and then have the variables passed in another playbook?

Answer 1

Your debug module doesn't say "that manifest is empty", it says the key manifest.key does not exist because it does not.
You registered a fact named manifest with:
register: manifest
You try to refer to a key of the above manifest named key and another key (!) named value:
msg: "[{{ manifest.key }}]: {{ manifest.value }}"
Please read Looping over Hashes chapter and acknowledge that (without using loop control) you refer to the iterated variable using item.
Please note that with name: manifest and register: manifest you read your vars file into manifest.ansible_facts.manifest.