How can I override ansible_become_user set in a host file with become_user at the task level?

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I set ansible_become in my hosts file because I do most things as root when setting up a new machine.

all:
  hosts:
    ganymede:
      ansible_host: ganymede.xcv.org

  vars:
    ansible_user: ubuntu
    ansible_become: yes
    ansible_become_user: root

I require the git repo to be cloned as the service account and I cannot figure out how to make that happen

- name: Git
  vars:
    ansible_become: no
  block:
    - name: whoami
      command: whoami
      register: a
    - debug:
      msg: {{ a.stdout }}
    - git:
        repo: "git@github.com:fakerepo/ganymede.git"
        dest: "/opt/"
        force: yes
        key_file: ~ganymede/.ssh/id_ed25519
  become: yes
  become_user: ganymede

Unsetting ansible_become appears to work because the user is ubuntu.

Setting become and become_user has no effect and I want to know what it takes for that to work so that git works correctly.

TASK [debug] ***********************************************
ok: [ganymede] => {
    "msg": "ubuntu"
}

TASK [git] *************************************************
fatal: [ganymede]: FAILED! => {
    "changed": false, 
    "cmd": "/usr/bin/git ls-remote git@github.com:fakerepo/ganymede.git -h refs/heads/HEAD", 
    "msg": 
        "Warning: Identity file /home/ganymede/.ssh/id_ed25519 not accessible: Permission denied."
        "Host key verification failed."
        "fatal: Could not read from remote repository."
        "Please make sure you have the correct access rights and the repository exists.",
    "rc": 128, 
    "stderr": 
        "Warning: Identity file /home/ganymede/.ssh/id_ed25519 not accessible: Permission denied."
        "Host key verification failed."
        "fatal: Could not read from remote repository."
        "Please make sure you have the correct access rights and the repository exists.", 
    "stderr_lines": [
        "Warning: Identity file /home/ganymede/.ssh/id_ed25519 not accessible: Permission denied.", 
        "Host key verification failed.", 
        "fatal: Could not read from remote repository.", 
        "", 
        "Please make sure you have the correct access rights and the repository exists."
    ], 
    "stdout": "", 
    "stdout_lines": []
}
ansible git
1 Answers

From sivel, one of the member of Ansible development team:

This behavior is documented under precedence rules: https://docs.ansible.com/ansible/latest/reference_appendices/general_precedence.html#precedence-categories

Task/play keywords have lower precedence to variables, since they are less specific to a host.

As such, the inventory variables, have higher precedence than your task specified become_user. The workaround for your configuration as you have found, is overriding ansible_become_user via vars: on the individual task.

See also: https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#understanding-variable-precedence

Source: Ansible issue 74929

And so, from the documentation page cited in the issue:

Ansible offers four sources for controlling its behavior. In order of precedence from lowest (most easily overridden) to highest (overrides all others), the categories are:

  • Configuration settings
  • Command-line options
  • Playbook keywords
  • Variables

Each category overrides any information from all lower-precedence categories. For example, a playbook keyword will override any configuration setting.

Source: Controlling how Ansible behaves: precedence rules

So, your fix is, as described, to override the ansible_become_user in the vars: section of that task:

- git:
    repo: "git@github.com:fakerepo/ganymede.git"
    dest: "/opt/"
    force: yes
    key_file: ~ganymede/.ssh/id_ed25519
  vars:
    ansible_become_user: ganymede

And in order to resolve your further acl issue, you have to install the right acl Python package on you managed nodes, which can be achieved with this task (run as root):

- pip:
    name: acl
user_21235300
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