CODEWITHSUNDEEP
pythonansible
dikkini
dikkini

Reputation: 1182

Ansible when compare two variables

In vars/main.yml I have this:

user_data:
  service:
    name: hello1
    description: abc
    update:
      name: hello
      version: 1

In playbook I try to write when condition:

      - name: "stop all"
        systemd:
          name: "does not matter.service"
          state: stopped
        when: user_data.service.update is defined

It works.

When i write this task with update in when condition:

      - name: "stop all"
        systemd:
          name: "does not matter.service"
          state: stopped
        when: user_data.service.update.name is defined

It is skipped

All variables are setted in vars/main.yml or passed using extra var as a JSON.

What's wrong?

Upvotes: 1

Views: 3395

Answers (2)

Zeitounator
Zeitounator

Reputation: 44615

update is actually a reserved word (i.e. built-in method of dict object). See the following playbook. You can define an update hash key in yaml but I did not find any way to retrieve it back correctly. The only solution I see at this point (besides firing a ticket on github ansible project) is to rename your hash key to something else.

The following playbook

---
- name: Debug that tricky thing
  hosts: localhost
  gather_facts: false

  vars:
    user_data:
      service:
        name: hello1
        description: abc
        update:
          name: hello
          version: 1

  tasks:
    - name: Show the full var
      debug:
        var: user_data

    - name: Try to how the update hash test1
      debug:
        var: user_data.update

    - name: Try to how the update hash test2
      debug:
        var: user_data["update"]

Results in

PLAY [Debug that tricky thing] ******************************************************************************************************************************************************************************************************************************************

TASK [Show the full var] ************************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "user_data": {
        "service": {
            "description": "abc",
            "name": "hello1",
            "update": {
                "name": "hello",
                "version": 1
            }
        }
    }
}

TASK [Try to how the update hash test1] ***************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "user_data.update": "<built-in method update of dict object at 0x7fc5d9256630>"
}

TASK [Try to how the update hash test2] ***********************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "user_data[\"update\"]": "<built-in method update of dict object at 0x7fc5d9256630>"
}

PLAY RECAP **************************************************************************************************************************************************************************************************************************************************************
localhost                  : ok=3    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

Upvotes: 1

Bonifase
Bonifase

Reputation: 21

The issue here is python interpreter does not understand the object format in the main.yml file. Convert that object in a format that can be understood by the interpreter. Usually, python objects are represented in the form of a dictionary, so you could convert it to something like this:

user_data = {'service': {'attr': 1, 'some_a': 'abc'}, 'update':{'name: 'hello', 'version': 1} }

Upvotes: 0

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