rules var-naming[no-role-prefix] and var-naming[pattern] collide if var_naming_pattern is changed from default

[mhallin2]

Summary

Role variable prefix does not work if var_naming_pattern: has been altered from its default.
#Bradley Thornton has requested me to create this as a bug.

If the var_naming_pattern setting in .ansible-lint.cfg file is changed from its default
and you create a role and use set_fact to set a variable
The rules var-naming[no-role-prefix] and var-naming[pattern] will collide as both scenarios can not be fulfilled

Issue Type

• Bug Report

OS / ENVIRONMENT

ansible-lint --version
ansible-lint 24.2.3 using ansible-core:2.16.6 ansible-compat:4.1.11 ruamel-yaml:0.18.6 ruamel-yaml-clib:0.2.8

• ansible installation method: pip
• ansible-lint installation method: pip

STEPS TO REPRODUCE

update .ansible-lint with the below setting

var_naming_pattern: "^[A-Z_][A-Za-z0-9_]*$"

Add a variable to the role vars main.yml file

---
Register_DNS_Host_Record_Variable: dummyvalue

Run ansible-lint on the new role

ansible-lint /collections/mynamespace/network/roles/register_dns_host_record

Desired Behavior

No errors should be reported

Actual Behavior

var-naming[no-role-prefix]: Variables names from within roles should use register_dns_host_record_ as a prefix. (vars: Register_DNS_Host_Record_Variable)

[Qalthos]

The var-naming[no-role-prefix] rule checks that role variables start with the role name exactly, i.e. including case. This is intentional to ensure consistency and clarity of role variables.

I can see in this case why you might want to use different casing, even if the prefix is otherwise the same, but we do not presently support this and are not planning on working on it at present. However, we do always welcome community contributions, and if you put together a PR, we will absolutely consider it.

[cidrblock]

Let's talk about this one. I think we can expose the regex to the user.