Ansible become_user with variable

Question

I am using Ansible 2.1.0.0

I try to use become_user with a variable in a task, but I receive the following message:

fatal: [host]: FAILED! => {"failed": true, "msg": "'ansible_user' is undefined"}

The task executing this is

- name: Config git user name
  git_config: name=user.name scope=global value={{ ansible_host }}
  become: Yes
  become_user: "{{ansible_user}}"

And the playbook has the following line to define the remote user:

- name: Foo
  hosts: foo
  vars:
    http_port: 80
  remote_user: admin

I've seen this response which seems to be the same problem, but this does not work for me.

I have seen also a set_fact solution but I would like to use the remote_user var if possible so no extra lines must be added if a playbook already has the remote_user var set.

Does anyone know how to do this or what I am doing wrong?

Answer 1

What about that:

- name: Foo
  hosts: foo
  vars:
    http_port: 80
    my_user: admin
  remote_user: "{{my_user}}"

then:

- name: Config git user name
  git_config: name=user.name scope=global value={{ ansible_host }}
  become: Yes
  become_user: "{{my_user}}"