This is my example playbook:
---
- name: play1
hosts: app1
vars_files:
- "vars/app1.yml"
tasks:
- include_role:
name: role1
vars:
applicationname: "{{ APPLICATIONNAME }}"
description: "{{ DESCRIPTION }}"
Now in the role, I want to make sure applicationname is not undefined,
empty or null.
It works when I use assert in the role:
/roles/defaults/main.yml
---
applicationname: ""
description: ""
/roles/tasks/main.yml
---
- assert:
that:
- (applicationname != "") and (applicationname is not none) and
(applicationname
is defined)
msg: "Variable 'applicationname' is null, empty or undefined"
But this is ugly when I have lots of variables in a role.
I tried the following approach:
/roles/defaults/main.yml
---
applicationname: ""
description: ""
required_vars:
- applicationname
/roles/tasks/main.yml
---
- assert:
that:
- item != ""
- item is not none
msg: "A Variable is null, empty or undefined. But we don't know which
one"
with_items: "{{ required_vars }}"
This workes, but we don't know which variable is affected, this is also
ugly.
Another approach:
- name: check required vars
fail: msg="Variable '{{ item }}' is not defined"
when: item not in vars
with_items: "{{required_vars}}"
Workes, but you cannot check the value of the variable, just if it is not
undefined.
How do I make sure that a lot of variables are not undefined, empty or null
when passed to a role in a simple way?
Thanks for your help.
Regards
jn
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