In your RoleB role, use a defaults file to handle default variables. That
will ensure you always have the var_roleb variable defined.
http://docs.ansible.com/ansible/playbooks_roles.html#role-default-variables
On Sunday, September 13, 2015 at 1:19:32 PM UTC+2, Arnaud Mazin wrote:
>
> Hi
>
> I'm trying to nest roles using dependencies in order to reuse as much code
> as possible and get into trouble when trying to omit some parameters
>
> My setup:
>
> # roles/roleA/tasks/main.yml
> ---
> - debug: msg="var var_rolea is set to {{ var_rolea|default('no idea') }}"
>
> # roles/roleB/meta/main.yml
> dependencies:
> - { role: roleA,
> var_rolea: "{{ var_roleb }}"
> }
>
> # playbook
> # play1, specify value
> - hosts: localhost
> gather_facts: no
> roles:
> - role: roleB
> var_roleb: plop
>
> # play2, omit value, let defaults apply
> - hosts: localhost
> gather_facts: no
> roles:
> - role: roleB
>
>
>
> I get a « fatal: [localhost] => One or more undefined variables:
> 'var_roleb' is undefined » error in this case.
>
> I tried several tricks into the roleB/meta/main.yml, such as:
>
> - var_rolea: "{{ var_roleb|default(omit) }}"
> - var_rolea: "{{ var_roleb|default(None) }}"
>
> But so far, I haven't found a pretty way to do this.
>
> Any Idea?
>
> Regards,
>
> Arnaud
>
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