roles/libvirt/tasks/vm-check-duplicate.yml


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- name: Fetch list of all VMs
  community.libvirt.virt:
    command: list_vms
  register: vms_list

- name: Fail if VM exists
  ansible.builtin.fail:
    msg: "VM {{ libvirt_vm_name }} is already in-use."
  when: libvirt_vm_name | string in vms_list.list_vms