do_dictsort() got an unexpected keyword argument 'reverse'

[Martin Cigorraga]

Hi everyone,

We are using a Jinja2 template to populate a configuration file, based on the information Ansible feeds it on runtime:

 ### Main Processes

{% for k, v in some_conf | dictsort() %}
  <process>
    cmdline -c /etc/some_tool/some_agent-{{ k }}.conf -o /var/log/some_tool/some_agent.log
  </process>
{% endfor %}

We get a predictable output thanks to using dictsort():

% cat /etc/some_tool/some_agent.conf
  <process>
    cmdline -c some_agent-AAA.conf -o /var/log/some_tool/some_agent.log
  </process>
  <process>
    cmdline -c some_agent-BBB.conf -o /var/log/some_tool/some_agent.log
  </process>

Thing is we need in the above configuration file that some_agent-BBB.conf is placed before than some_agent-AAA.conf; for that matter I introduced the reverse=True argument to dictsort():

 ### Main Processes

{% for k, v in some_conf | dictsort(reverse=True) %}
  <process>
    cmdline -c /etc/some_tool/some_agent-{{ k }}.conf -o /var/log/some_tool/some_agent.log
  </process>
{% endfor %}

When tested using Yasha (https://github.com/kblomqvist/yasha), the output is the expected one:

% cat /etc/some_tool/some_agent.conf
  <process>
    cmdline -c some_agent-BBB.conf -o /var/log/some_tool/some_agent.log

  </process>
  <process>
    cmdline -c some_agent-AAA.conf -o /var/log/some_tool/some_agent.log

  </process>

However, when running the playbook, Ansible complains and stops execution, showing the error message I put on the subject of this email:  do_dictsort() got an unexpected keyword argument 'reverse'

Why're running ansible 2.1.1.0.

Thanks!

[Matt Martz]

the `reverse` argument for `dictsort` was not added until jinja2 v2.10 which was released on Nov 8, 2017

Ansible has a dependency on jinja2, but does not dictate which specific version you should have installed.  To get access to that feature you will need to upgrade your version of jinja2

You may be able to use the `reverse` filter instead, but I have not tested: http://jinja.pocoo.org/docs/dev/templates/#reverse

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Matt Martz
@sivel
sivel.net

[Martin Cigorraga]

Hi Matt,

Thanks for your thorough and quick answer. We'll look into it and let you know the result.

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[Martin Cigorraga]

Matt,

I can't share the details as it wasn't me the one who made the implementation, but we were able to adapt the Jinja2 2.10 filter plugin by converting it to an Ansible v2 filter plugin.

Cheers