Ansible facts to from and updating json files

ansible_facts_to_from_json.sh

# Display all ansible facts from remote machines
ansible -i inventories/example all -m setup



# Write value to json file
TEMP_PLAYBOOK_FILE="TEMP_PLAY.yml"
PLAYBOOK_CONTENTS=$(cat <<'CONTENTS_HEREDOC'
---
- hosts: all
  become: true
  vars:
    vars_file: {}
  tasks:
    - set_fact:
        new_host: "{{ '{\"' + inventory_hostname + '\":{\"internal_ip\":\"' + hostvars[inventory_hostname]['ansible_default_ipv4']['address'] + '\"}}' }}"
    - set_fact:
        vars_file: "{{ vars_file | combine( new_host, recursive=True ) }}"
    
    - debug: 
        var: vars_file
    
    - set_fact:
        new_host: "{{ '{\"localhost\":{\"internal_ip\":\"127.0.0.1\"}}' }}"
    - set_fact:
        vars_file: "{{ vars_file | combine( new_host, recursive=True ) }}"
    
    - debug: 
        var: vars_file
    
    - local_action: copy content={{ vars_file | to_nice_json }} dest=json/host-vars.json
      become: false
CONTENTS_HEREDOC
)
echo "${PLAYBOOK_CONTENTS}" > ${TEMP_PLAYBOOK_FILE}
ansible-playbook -i inventories/example ${TEMP_PLAYBOOK_FILE} --diff
rm ${TEMP_PLAYBOOK_FILE}



# Read value from json file
TEMP_PLAYBOOK_FILE="TEMP_PLAY.yml"
PLAYBOOK_CONTENTS=$(cat <<'CONTENTS_HEREDOC'
---
- hosts: all
  become: true
  vars:
    vars_file: "{{ lookup('file', 'json/host-vars.json', errors='warn') }}"
  tasks:
    - debug: 
        msg: "{{ vars_file }}"
    
    - set_fact:
        vars_file_json: "{{ vars_file }}"
    - debug: 
        var: vars_file_json
    - debug: 
        msg: "{{ vars_file_json | to_json | from_json }}"
    
    # For json_query, reference: http://jmespath.org/tutorial.html
    - set_fact:
        # Putting variables into the json query ends up involving escpaing quotes
        vars_json_query: "{{ '\"' + inventory_hostname + '\".\"internal_ip\"' }}"
    - debug: 
        msg: "{{ vars_json_query }}"
    
    - name: Resulting parsed Internal IP
      debug: 
        msg: "{{ vars_file_json | to_json | from_json | json_query( vars_json_query ) }}"
CONTENTS_HEREDOC
)
echo "${PLAYBOOK_CONTENTS}" > ${TEMP_PLAYBOOK_FILE}
ansible-playbook -i inventories/example ${TEMP_PLAYBOOK_FILE} --diff
rm ${TEMP_PLAYBOOK_FILE}



# Read value from json file, add to value, and write json to file
TEMP_PLAYBOOK_FILE="TEMP_PLAY.yml"
PLAYBOOK_CONTENTS=$(cat <<'CONTENTS_HEREDOC'
---
- hosts: all
  become: true
  vars:
    vars_file: "{{ lookup('file', 'json/host-vars.json', errors='warn') }}"
  tasks:
    - name: debug vars_file
      debug: 
        var: vars_file
    
    - set_fact:
        vars_file_obj: "{{ (vars_file | length > 0) | ternary(vars_file, {}) }}"
    
    - name: debug vars_file_obj
      debug: 
        var: vars_file_obj
    - set_fact:
        combined_vars_file: "{{ vars_file_obj }}"
    
    - set_fact:
        new_host: "{{ '{\"newserver\":{\"internal_ip\":\"11.22.33.44\"}}' }}"
    - set_fact:
        combined_vars_file: "{{ combined_vars_file | combine( new_host, recursive=True ) }}"
    
    - set_fact:
        new_host: "{{ '{\"' + inventory_hostname + '\":{\"internal_ip\":\"' + hostvars[inventory_hostname]['ansible_default_ipv4']['address'] + '\"}}' }}"
    - set_fact:
        combined_vars_file: "{{ combined_vars_file | combine( new_host, recursive=True ) }}"
    
    - name: debug combined_vars_file
      debug: 
        var: combined_vars_file
    
    - local_action: copy content={{ combined_vars_file | to_nice_json }} dest=json/host-vars.json
      become: false
CONTENTS_HEREDOC
)
echo "${PLAYBOOK_CONTENTS}" > ${TEMP_PLAYBOOK_FILE}
ansible-playbook -i inventories/example ${TEMP_PLAYBOOK_FILE} --diff
rm ${TEMP_PLAYBOOK_FILE}