set_fact/include/role vars precedence

[Takeshi Yaegashi]

Hi,

I'm confused with variable precedence of Ansible 2.0 documented in http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable .  Suppose I have playbooks and roles as follows:

hosts (inventory):

[default]

localhost x=1

roles/a/tasks/main.yml (task in role a):

---

- set_fact:

    x: '{{ x + 1 }}'

roles/b/tasks/main.yml (task in role b):

---

- debug:

    var: x

tasks.yml (playbook):

---

- hosts: all

  gather_facts: no

  tasks:

    - include: roles/a/tasks/main.yml

      vars:

        x: 10

    - include: roles/b/tasks/main.yml

    - include: roles/b/tasks/main.yml

      vars:

        x: 20

roles.yml (playbook):

---

- hosts: all

  gather_facts: no

  roles:

    - role: a

      x: 10

    - role: b

    - role: b

      x: 20

With Ansible 2.0.1.0 those two playbooks show diffrent results in the last debug task:

$ ansible-playbook -i hosts tasks.yml 

PLAY ***************************************************************************

TASK [include] *****************************************************************

included: /home/yaegashi/tmp/test/roles/a/tasks/main.yml for localhost

TASK [set_fact] ****************************************************************

ok: [localhost]

TASK [include] *****************************************************************

included: /home/yaegashi/tmp/test/roles/b/tasks/main.yml for localhost

TASK [debug] *******************************************************************

ok: [localhost] => {

    "x": "11"

}

TASK [include] *****************************************************************

included: /home/yaegashi/tmp/test/roles/b/tasks/main.yml for localhost

TASK [debug] *******************************************************************

ok: [localhost] => {

    "x": 20

}

PLAY RECAP *********************************************************************

localhost                  : ok=6    changed=0    unreachable=0    failed=0   

$ ansible-playbook -i hosts roles.yml 

PLAY ***************************************************************************

TASK [a : set_fact] ************************************************************

ok: [localhost]

TASK [b : debug] ***************************************************************

ok: [localhost] => {

    "x": "11"

}

TASK [b : debug] ***************************************************************

ok: [localhost] => {

    "x": "11"

}

PLAY RECAP *********************************************************************

localhost                  : ok=3    changed=0    unreachable=0    failed=0   

While include vars can override vars by set_fact, role variable can't.  Is that an expected behavior?

What prcedences are actually given to vars passed by role/include calls respectively?

My first thought was both of them are "role and include vars" in the precedence list in the document.

Regards,

-- 

YAEGASHI Takeshi <yaeg...@debian.org>