How to pass variable into role

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1

SUMMARY

It seems hard to send a param into a role. The rule of vars is confusing.

`

What I want is overwrite version in role b by version in role a

roles/a/default/main.yml

version: v1.0.1

roles/a/tasks/main.yml

  • name: include role
    include_role:
    name: b
    vars:
    version: “{{ version }}”

roles/b/default/main.yml

version: “”

roles/b/tasks/main.yml

  • name: ouput version
    debug:
    var: version
    `

EXPECTED RESULTS
I can pass the version variable into role b without any variable name changes of role b and a

ACTUAL RESULTS

  1. I have to change version to _version in role a.
    Some problems will happened if _version is also defined by b. And I have to know all inner variables of b

  2. I have to undefine version in role b
    Role b can’t have any default value of version.

It seems hard to keep independent of role.

https://github.com/ansible/ansible/issues/41257

2

'role defaults' are special, they do make them available for the rest
of the play but a role will always give priority to their own default
definition.