Display Ansible playbook with lookups interpolated - ansible

Question

I have an Ansible playbook that looks, in part, like this:
...
environment:
F2B_DB_PURGE_AGE: "{{ lookup('env','F2B_DB_PURGE_AGE') }}"
F2B_LOG_LEVEL: "{{ lookup('env','F2B_LOG_LEVEL') }}"
SSMTP_HOST: "{{ lookup('env','SSMTP_HOST') }}"
SSMTP_PORT: "{{ lookup('env','SSMTP_PORT') }}"
SSMTP_TLS: "{{ lookup('env','SSMTP_TLS') }}"
...
Is there any way to run ansible-playbook so that it will show the results of the YAML file after replacing the lookups with their values? That is, I would like to be able to run something like ansible-playbook file.yaml --dry-run and see on standard output (assuming the environment variables were set appropriately):
...
environment:
F2B_DB_PURGE_AGE: "20"
F2B_LOG_LEVEL: "debug"
SSMTP_HOST: "smtp.example.com"
SSMTP_PORT: "487"
SSMTP_TLS: "true"
...

Answer 1

Set the environment for testing
shell> cat env.sh
#!/usr/bin/bash
export F2B_DB_PURGE_AGE="20"
export F2B_LOG_LEVEL="debug"
export SSMTP_HOST="smtp.example.com"
export SSMTP_PORT="487"
export SSMTP_TLS="true"
shell> source env.sh
Given the inventory
shell> cat hosts
localhost ansible_connection=local
Q: "Run something like ansible-playbook file.yaml --dry-run and see environment"
A: The below playbook does the job
shell> cat file.yml
- hosts: all
vars:
my_environment:
F2B_DB_PURGE_AGE: "{{ lookup('env','F2B_DB_PURGE_AGE') }}"
F2B_LOG_LEVEL: "{{ lookup('env','F2B_LOG_LEVEL') }}"
SSMTP_HOST: "{{ lookup('env','SSMTP_HOST') }}"
SSMTP_PORT: "{{ lookup('env','SSMTP_PORT') }}"
SSMTP_TLS: "{{ lookup('env','SSMTP_TLS') }}"
tasks:
- block:
- debug:
msg: |
my_environment:
{{ my_environment|to_nice_yaml|indent(2) }}
- meta: end_play
when: dry_run|d(false)|bool
- debug:
msg: Continue ...
Set dry_run=true
shell> ansible-playbook file.yml -e dry_run=true
PLAY [all] ***********************************************************************************
TASK [debug] *********************************************************************************
ok: [localhost] =>
msg: |-
my_environment:
F2B_DB_PURGE_AGE: '20'
F2B_LOG_LEVEL: debug
SSMTP_HOST: smtp.example.com
SSMTP_PORT: '487'
SSMTP_TLS: 'true'
TASK [meta] **********************************************************************************
PLAY RECAP ***********************************************************************************
localhost: ok=1 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
By default, the playbook will execute tasks
shell> ansible-playbook file.yml
PLAY [all] ***********************************************************************************
TASK [debug] *********************************************************************************
skipping: [localhost]
TASK [meta] **********************************************************************************
skipping: [localhost]
TASK [debug] *********************************************************************************
ok: [localhost] =>
msg: Continue ...
PLAY RECAP ***********************************************************************************
localhost: ok=1 changed=0 unreachable=0 failed=0 skipped=1 rescued=0 ignored=0
Optionally, let the playbook gather facts and use the dictionary ansible_env. Use the filer ansible.utils.keep_keys to select your variables
- hosts: all
gather_facts: true
vars:
my_environment_vars:
- F2B_DB_PURGE_AGE
- F2B_LOG_LEVEL
- SSMTP_HOST
- SSMTP_PORT
- SSMTP_TLS
my_environment: "{{ ansible_env|
ansible.utils.keep_keys(target=my_environment_vars) }}"
tasks:
- block:
- debug:
msg: |
my_environment:
{{ my_environment|to_nice_yaml|indent(2) }}
- meta: end_play
when: dry_run|d(false)|bool
- debug:
msg: Continue ...