ansible get result from role and append to a list - ansible

Question

I have a play like this
---
- name: List images in ACRs
any_errors_fatal: true
hosts:
- localhost
gather_facts: false
vars:
acrs: ["registry1", "registry2"]
tasks:
- name: list repos
with_items: "{{ acrs }}"
include_role:
name: list_docker_image_repos
vars:
registry_name: "{{ item }}"
list_docker_image_repos will do set_fact which a list of dicts.
How can I append all the facts (from every iteration) to a list?
Or is there are different way to do this?
thanks

Answer 1

In each iteration put the list into a dictionary. For example, given the role
shell> cat roles/list_docker_image_repos/tasks/main.yml
- set_fact:
docker_image_repos: "{{ ['repo1', 'repo2', 'repo3']|
product([registry_name])|
map('join', '-')|
list }}"
- set_fact:
my_lists: "{{ my_lists|
combine({registry_name: docker_image_repos}) }}"
the playbook
- hosts: localhost
vars:
acrs: [reg1, reg2]
my_lists: {}
tasks:
- name: list repos
include_role:
name: list_docker_image_repos
loop: "{{ acrs }}"
vars:
registry_name: "{{ item }}"
- debug:
var: my_lists
gives the dictionary
my_lists:
reg1:
- repo1-reg1
- repo2-reg1
- repo3-reg1
reg2:
- repo1-reg2
- repo2-reg2
- repo3-reg2
A dictionary is a more suitable structure for this purpose compared with a list. There are many ways how to use it. For example, you can
extract the lists
- debug:
msg: "{{ acrs|map('extract', my_lists)|list }}"
gives
msg:
- - repo1-reg1
- repo2-reg1
- repo3-reg1
- - repo1-reg2
- repo2-reg2
- repo3-reg2
Use the filter flatten to put all items into a single list
- debug:
msg: "{{ acrs|map('extract', my_lists)|flatten }}"
gives
msg:
- repo1-reg1
- repo2-reg1
- repo3-reg1
- repo1-reg2
- repo2-reg2
- repo3-reg2
Use the filter dict2items to iterate items
- debug:
var: item
loop: "{{ my_lists|dict2items }}"
gives (abridged)
item:
key: reg1
value:
- repo1-reg1
- repo2-reg1
- repo3-reg1
item:
key: reg2
value:
- repo1-reg2
- repo2-reg2
- repo3-reg2
Or, use the lookup plugin subelements to iterate the items of the lists as well
- debug:
var: item
with_subelements:
- "{{ my_lists|dict2items }}"
- value
gives (abridged)
item:
- key: reg1
- repo1-reg1
item:
- key: reg1
- repo2-reg1
item:
- key: reg1
- repo3-reg1
item:
- key: reg2
- repo1-reg2
item:
- key: reg2
- repo2-reg2
item:
- key: reg2
- repo3-reg2
Example of a complete playbook for testing
- hosts: localhost
vars:
acrs: [reg1, reg2]
my_lists: {}
tasks:
- name: list repos
include_role:
name: list_docker_image_repos
loop: "{{ acrs }}"
vars:
registry_name: "{{ item }}"
- debug:
var: my_lists
- debug:
msg: "{{ acrs|map('extract', my_lists)|list }}"
- debug:
msg: "{{ acrs|map('extract', my_lists)|flatten }}"
- debug:
var: item
loop: "{{ my_lists|dict2items }}"
- debug:
var: item
with_subelements:
- "{{ my_lists|dict2items }}"
- value