Ansible: set_fact after successful variable match in array

Question

I have following playbook ~ # cat demo.yml:

- name: demo
  hosts: localhost
  gather_facts: no

  vars:
    set:
      task:
        type: var1
    task:
    - type: var1
    - type: var2
    - type: var3
  
  tasks:
  - debug:
      var: set

  - debug:
      var: task

  - set_fact:
      task: 
        type: "{{set.task.type if item.type is search(set.task.type|join('|')) else 'absent'}}"
    loop: "{{task}}"
  
  - debug:
      var: task

Output:

PLAY [demo] ************************************************************************************************************************************************************************************************

TASK [debug] ***********************************************************************************************************************************************************************************************
ok: [localhost] => {
    "set": {
        "task": {
            "type": "var1"
        }
    }
}

TASK [debug] ***********************************************************************************************************************************************************************************************
ok: [localhost] => {
    "task": [
        {
            "type": "var1"
        },
        {
            "type": "var2"
        },
        {
            "type": "var3"
        }
    ]
}

TASK [set_fact] ********************************************************************************************************************************************************************************************
ok: [localhost] => (item={'type': 'var1'})
ok: [localhost] => (item={'type': 'var2'})
ok: [localhost] => (item={'type': 'var3'})

TASK [debug] ***********************************************************************************************************************************************************************************************
ok: [localhost] => {
    "task": {
        "type": "var1"
    }
}

PLAY RECAP *************************************************************************************************************************************************************************************************
localhost                  : ok=4    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

As you could see this works great and new value for variable task.type is set to var1.

However the problem is when I provide set.task.type: var4 or any other variable.

Than task.type is set to var4 instead of absent.

Question:

How to set new value task.type: absent if set.task.type does not match any values from the array?

Your loop redefines the values of task. During the first execution, task is a list that contains three items. After the first iteration of your loop, task is a dictionary. Don't try to re-use the variable name like that and you will probably see different behavior. — larsks
– larsks, Commented Aug 10, 2022 at 18:55
I'm also a little unclear on the logic you're trying to implement, so if you could explain that a bit more clearly that would help. — larsks
– larsks, Commented Aug 10, 2022 at 18:56
Why do you want to introduce this absent state if you can check for is defined? — Panki
– Panki, Commented Aug 10, 2022 at 19:31
I'm trying to verify if variable set.task.type is on the list of task.type. If value is present than I need to update task.type to value from set.task.type. This woks great until I provide set.task.type value that does not exist on task.type array — Rafal Niznik
– Rafal Niznik, Commented Aug 11, 2022 at 8:48

U880D · Accepted Answer · 2022-08-16 10:18:41Z

For me it is also unclear what you are try to achieve, however, regarding your question

How to set new value task.type: absent if set.task.type does not match any values from the array?

and

This woks great until I provide set.task.type value that does not exist on task.type array (annot.: list)

this seems to be because of the filter | join('|') on the dictionary, as well the loop which seems to be unnecessary to me. So for how to

verify if variable set.task.type is on the list of task.type. If value is present than I need to update task.type to value from set.task.type.

perform without a loop

---
- hosts: localhost
  become: false
  gather_facts: false

  vars:

    # dictionary
    set: 
      task:
        type: var4

    # list
    task:
    - type: var1
    - type: var2
    - type: var3

  tasks:

  - debug:
      msg: "{{ set.task.type if task | join('|') is search(set.task.type) else 'absent' }}"

which will just result into an output of

TASK [debug] *****
ok: [localhost] =>
  msg: absent

Please take note that you are not set a new value but creating a new object instead. There will be no list task[*].type but a dictionary task.type after.

Further Documentation

update_fact module – Update currently set facts

Variables are not modified in place, instead they are returned by the module.

that woks great! thank you!

Rafal Niznik
– Rafal Niznik

2022-08-16 18:53:10 +00:00
Commented Aug 16, 2022 at 18:53 — Rafal Niznik
– Rafal Niznik, Commented Aug 16, 2022 at 18:53

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