Ansible systemctl --user for another user - ansible

Question

I'm logging into another computer as the unprivileged user ansible and I'd like to have ansible enable a systemd user service for the user bob.
Without ansible, the solution would be ssh bob#machine followed by systemctl --user enable service
However, with ansible, there are two problems:
Newer versions of ansible will refuse to become the unprivileged user bob if already logged in as another unprivileged user (ansible).
Even if this worked, dbus would not be started and systemctl would not be able to talk to systemd (if I understood this correctly).
A horribly ugly workaround would be to execute the shell command, have the remote host ssh into itself as bob and run the systemctl raw command there.
Is there a nicer way to get this done?

Answer 1

Both options are feasible.
remote_user: bob
- hosts: test_01
become: no
remote_user: admin
tasks:
- command: whoami
register: result
- debug:
var: result.stdout
- command: whoami
remote_user: bob
register: result
- debug:
var: result.stdout
gives (abridged)
result.stdout: admin
result.stdout: bob
pipelining = true quoting from Becoming an Unprivileged User
Use pipelining. When pipelining is enabled, Ansible doesn’t save the module to a temporary file on the client. Instead, it pipes the module to the remote python interpreter’s stdin. Pipelining does not work for python modules involving file transfer (for example: copy, fetch, template), or for non-python modules.
- hosts: test_01
become: no
remote_user: admin
tasks:
- command: whoami
register: result
- debug:
var: result.stdout
- command: whoami
become_user: bob
become_method: sudo
become: yes
register: result
- debug:
var: result.stdout
gives (abridged) the same result
result.stdout: admin
result.stdout: bob
with
shell> grep pipe ansible.cfg
pipelining = true