Inconsistent boolean handling of False

[Si W]

I have been struggling with booloean handling and read through https://github.com/ansible/ansible/issues/8629 not sure if its fixed or I am just not getting the jist.  If I run something like ..

  vars:
    foo: True
    bar: False
    foobar: '{{ foo and bar }}'

  tasks:

    - debug: msg="If foo is True"
      when: foo

    - debug: msg="If bar is False"
      when: not bar

    - debug: msg="foobar is True"
      when: foobar

    - debug: msg="foobar is false"
      when: not foobar

    - debug: msg="foobar|bool is false"
      when: not foobar|bool

    - debug:
        var=foobar

If I run the above I get

PLAY [localhost] **************************************************************


TASK: [debug msg="If foo is True"] ********************************************
ok: [localhost] => {
    "msg": "If foo is True"
}

TASK: [debug msg="If bar is False"] *******************************************
ok: [localhost] => {
    "msg": "If bar is False"
}

TASK: [debug msg="foobar is True"] ********************************************
skipping: [localhost]

TASK: [debug msg="foobar is false"] *******************************************
skipping: [localhost]

TASK: [debug msg="foobar|bool is false"] **************************************
ok: [localhost] => {
    "msg": "foobar|bool is false"
}

TASK: [debug var=foobar] ******************************************************
ok: [localhost] => {
    "var": {
        "foobar": "False"
    }
}

PLAY RECAP ********************************************************************
localhost                  : ok=5    changed=0    unreachable=0    failed=0

Is this just expected behaviour due to mix of yaml and jinja2 it just seems messy having to work out when to use |bool ?

Cheers
Si

  

[Michael Peters]

This bug should be fixed. Which version are you using? But even when
it's fixed, the string "false" is a true value.

I do admit that "|bool" everywhere is kind of annoying, but it's the
safest way to always make sure your context is correct.

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[Si W]

Running ansible 1.9.1.  Maybe the booloean section in https://docs.ansible.com/playbooks_conditionals.html#the-when-statement nees to reflect this and spent some time to figure this out?

Cheers,
Si.