roles/nova/tasks/generate_public_key.yml

# Copyright (c) 2023 VEXXHOST, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

- name: Generate public key for SSH private key
  become: false
  delegate_to: localhost
  block:
    - name: Generate temporary file for SSH public key
      check_mode: false
      changed_when: false
      ansible.builtin.tempfile:
        state: file
        prefix: nova_ssh_key_
      register: _nova_ssh_key_tempfile
    # NOTE(mnaser): It's important to add a trailing newline at the end of this
    #               string or else `ssh-keygen` will not be happy.
    - name: Write contents of current private SSH key
      check_mode: false
      changed_when: false
      ansible.builtin.copy:
        dest: "{{ _nova_ssh_key_tempfile.path }}"
        content: "{{ nova_ssh_key }}\n"
        mode: "0600"
    - name: Generate public key for SSH private key
      changed_when: false
      community.crypto.openssh_keypair:
        path: "{{ _nova_ssh_key_tempfile.path }}"
        regenerate: never
      register: _nova_ssh_publickey
  always:
    - name: Delete temporary file for public SSH key
      check_mode: false
      changed_when: false
      ansible.builtin.file:
        path: "{{ _nova_ssh_key_tempfile.path }}"
        state: absent