set facts from items in a loop

[solarflow 99]

I wonder if something like this can be done, the problem i'm seeing is that the fact name has to be static, and could not use {{ item }}:

   - name: Set each tag to facts
     set_fact:
       list_of_vars: "{{ my_instance.instances | map(attribute='tags.list_of_vars') | list | join('\n') }}"

   - name: Split "list_of_vars" variable into a comma separated list
     set_fact:
       item_list: "{{ list_of_vars.split(',') }}"

   - name: lookup SSM Parameter Store secrets
     set_fact:
       {{ item }}: "{{ lookup('amazon.aws.ssm_parameter', puppet_env+'_'+env+'_{{ item }}', region=ansible_ec2_placement_region) }}"
     with_items: "{{ item_list }}"

This would give me a fact for each comma separated var I put in the tag, if only it worked.  Is there a better way to do something like this?

[Todd Lewis]

You could perhaps template your desired variables and values into a file, then use the ansible.builtin.include_vars module to read them in.

https://docs.ansible.com/ansible/latest/collections/ansible/builtin/include_vars_module.html

[Will McDonald]

I don't 100% understand your ultimate aim here. It might be easier to understand if you break it down into smaller steps and include some sample inputs and desired output? 

A sanitised version of what's in my_instance, item_list , and what you would like out at the end might help?

IF I understand what you're trying to do, using your loop item as the key for your set_fact. For me, with appropriate quoting this seems to work... 

$ cat wtf.yml
- hosts: localhost
  become: no
  gather_facts: no

  vars:
    varlist:
      - value1
      - value2
      - valueC

  tasks:
    - name: Use item as the fact key for set_fact in a loop
      set_fact:
        "{{ item }}": value
      loop: "{{ varlist }}"

    - name: Check the values assigned to the facts
      debug:
        var: "{{ item }}"
      loop: "{{ varlist }}"

$ ansible-playbook wtf.yml
PLAY [localhost] *************************************************************************************************************************
TASK [Use item as the fact key for set_fact in a loop] ***********************************************************************************
ok: [localhost] => (item=value1)
ok: [localhost] => (item=value2)
ok: [localhost] => (item=valueC)

TASK [Check the values assigned to the facts] ********************************************************************************************
ok: [localhost] => (item=value1) => {
    "ansible_loop_var": "item",
    "item": "value1",
    "value1": "value"
}
ok: [localhost] => (item=value2) => {
    "ansible_loop_var": "item",
    "item": "value2",
    "value2": "value"
}
ok: [localhost] => (item=valueC) => {
    "ansible_loop_var": "item",
    "item": "valueC",
    "valueC": "value"
}

PLAY RECAP *******************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

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[solarflow 99]

doh, thats the only thing it took I was missing!  If I double quoted {{item}} like you just did, then it works.

To give some more background on the problem, I couldn't simply template the vars since each of my different host inventories may have a different number of variables it needed.  So my aim was to do something like this, Create a tag on an EC2 instance with a comma separated list I would use to loop through, for each item it would assign a value from parameter store that matches with the item name:

TAG:

Key                 Value

list_of_vars = a,b,c

  

in param store I have a parameter of "a" "b" and "c" with a secret value assigned.  This way all I have to do is update the tag with more variables, and each host can have whatever I want as long as there is a matching param store.  Its working now, this is great, thanks to everyone.

The only other way I could think of would have to say "for this inventory file, use this var template" and I don't think there is any good way to do that.