Ndtyjky

I have a playbook that is compatible with Ansible 2.6. This playbook uses the loop_control module to construct a string.

vars:

  app_config:

      attr1    :

      - "1"

      nexatt  :

      - "b"

 ...

- set_fact:

     app_properties: ""



- name: Reading the Specific Configuration

  set_fact:

     app_properties: "{{ app_properties }}{{ (index > 0)|ternary(',','') }}{{ item.key }}={{ item.value[0] }}"

  loop: "{{  app_config|dict2items }}"

  loop_control:

    index_var: index

The string is then passed to a script as an option:

- name: Create Configurations

  command: "{{ dir }}/{{ script }}

            {{ item }}"

  with_items:

    - "{{ app_properties }}"

Is there a way to do this so that it is Ansible 2.0 compatible (given that Ansible 2.0 does not have loop_control)?
(I have another setup that requires Ansible 2.0 and needs this playbook. I cannot upgrade to Ansible 2.6).

If you want a direct equivalent, you can use the with_indexed_items loop construct to iterate over a list along with an index value. Because the with_* loops perform an implicit flattening of their input, you'll need to wrap your list in a list, so that the final playbook looks like this:

- hosts: localhost

  gather_facts: false

  vars:

    app_config:

      attr1:

        - "1"

      nexatt:

        - "b"

  tasks:

    - name: Reading the Specific Configuration

      set_fact:

        app_properties: "{{ app_properties|default('') }}{{ (item.0 > 0)|ternary(',','') }}{{ item.1.0 }}={{ item.1.1.0 }}"

      with_indexed_items: ["{{ app_config.items() }}"]



    - debug:

        var: app_properties

I've dropped your task that initializes app_properties in favor of
using Ansible's default filter.

For what you're doing you don't even need to use a loop
index. For example, if you're willing to live with an additional
set_fact task, you could do this:

- hosts: localhost

  gather_facts: false

  vars:

    app_config:

      attr1:

        - "1"

      nexatt:

        - "b"

  tasks:

    - name: Reading the Specific Configuration

      set_fact:

        app_properties_list: "{{ app_properties_list|default() + ['%s=%s' % (item.0, item.1.0)] }}"

      with_items: ["{{ app_config.items() }}"]



    - name: Create comma-delimieted app_properties list

      set_fact:

        app_properties: "{{ ','.join(app_properties_list) }}"



    - debug:

        var: app_properties

The above will work with Ansible 2.0.0.2 or later (and probably
earlier!). There are probably other ways of tackling this problems as
well (such as a template {% for %}...{% endfor %} loop).