The correct pattern would be:

when: foo is defined and foo



On Fri, Jul 25, 2014 at 3:29 PM, Michael Dur <[email protected]> wrote:

> I've discovered two things I'll post here:
>
> 1. For the time being you can toggle failing on undefined variables in the
> ansible config
>
> 2. It is better to use 'is defined' or 'is not defined' rather than
> comparison in this use case.
>
>
> On Friday, July 25, 2014 3:04:28 PM UTC-4, Michael Dur wrote:
>>
>> I have a role which is just a meta playbook for installing many packages.
>> I only want these to run once during an ansible run  since interacting
>> with the package manager is slow.
>> I thought I'd register a variable and check it, however I'm getting an
>> error.
>>
>> TASK: [feature/zypper | remove non-seas repos]
>> ********************************
>> fatal: [tr808.seas.upenn.edu] => error while evaluating conditional: (
>> common_has_executed == 'false')
>>
>> Here the relevant files:
>>
>> common/tasks/main.yml
>> ---
>> - name: log common status
>>   set_fact:  common_has_executed = 'true'
>>
>> common/meta/main.yml
>> ---
>> allow_duplicates: no
>> dependencies:
>>
>>   - { role: feature/rc.firewall, when: ( common_has_executed == 'false') }
>>   - { role: feature/perl, when: ( common_has_executed == 'false') }
>>   - { role: feature/python, when: ( common_has_executed == 'false') }
>>   - { role: feature/ruby, when: ( common_has_executed is == 'false') }
>>
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