Ansible-Bootstrap/roles/system_check/tasks/main.yml

---
- name: Gather minimal facts for safety checks
  ansible.builtin.setup:
    gather_subset:
      - "!all"
      - "min"
      - "mounts"
  changed_when: false

- name: Production system protection check
  block:
    - name: Check for OS release information
      ansible.builtin.stat:
        path: /etc/os-release
      register: system_check_os_release_exists

    - name: Check for live environment markers
      ansible.builtin.stat:
        path: "{{ item }}"
      loop:
        - /run/archiso
        - /run/live
        - /run/initramfs
        - /run/initramfs/live
      register: system_check_live_markers
      changed_when: false

    - name: Determine root filesystem type
      ansible.builtin.set_fact:
        system_check_root_fstype: >-
          {{
            ansible_mounts
            | selectattr('mount', 'equalto', '/')
            | map(attribute='fstype')
            | list
            | first
            | default('')
            | lower
          }}
      changed_when: false

    - name: Identify live environment indicators
      ansible.builtin.set_fact:
        system_check_is_live_environment: >-
          {{
            (not system_check_os_release_exists.stat.exists)
            or (
              system_check_live_markers.results
              | selectattr('stat.exists')
              | list
              | length
              > 0
            )
            or system_check_root_fstype in ['overlay', 'overlayfs', 'squashfs', 'aufs']
            or (ansible_hostname | default('') | lower is search('live'))
          }}
      changed_when: false

    - name: Assert target is not a production system
      ansible.builtin.assert:
        that:
          - system_check_is_live_environment | bool
        fail_msg: |
          PRODUCTION SYSTEM DETECTED - ABORTING

          The target system appears to be a production environment with an already
          installed operating system. This playbook is designed to run ONLY on
          live installer environments (e.g., ArchLinux ISO, Debian netinst).

          DO NOT proceed on production systems. This could result in data loss.

          To use this playbook:
          1. Boot from a live installer ISO (ArchLinux, Debian, Ubuntu, etc.)
          2. Run playbook against live environment
          3. Target an empty disk for installation

          If you are certain you want to proceed, you must verify you are running
          from a live environment, not an installed system.
        quiet: true

- name: VM existence protection check
  when: install_type == "virtual"
  block:
    - name: Check if VM already exists on libvirt
      when: hypervisor == "libvirt"
      delegate_to: localhost
      become: false
      community.libvirt.virt:
        command: list_vms
      register: system_check_libvirt_existing_vms
      changed_when: false
      failed_when: false

    - name: Abort if VM already exists on libvirt
      when: hypervisor == "libvirt"
      ansible.builtin.assert:
        that:
          - hostname not in system_check_libvirt_existing_vms.domains | default([])
        fail_msg: |
          VM {{ hostname }} already exists on libvirt hypervisor.
          To avoid data loss, the playbook will not overwrite or delete existing VMs.
          Please choose a different hostname or remove the existing VM manually before proceeding.
        quiet: true

    - name: Check if VM already exists on Proxmox
      when: hypervisor == "proxmox"
      delegate_to: localhost
      become: false
      community.proxmox.proxmox_vm_info:
        api_host: "{{ hypervisor_url }}"
        api_user: "{{ hypervisor_username }}"
        api_password: "{{ hypervisor_password }}"
        node: "{{ hypervisor_node }}"
        vmid: "{{ system_cfg.id }}"
        name: "{{ hostname }}"
        type: qemu
      register: system_check_proxmox_check_result
      changed_when: false

    - name: Abort if VM already exists on Proxmox
      when: hypervisor == "proxmox"
      ansible.builtin.assert:
        that:
          - system_check_proxmox_check_result.proxmox_vms | default([]) | length == 0
        fail_msg: |
          VM {{ hostname }} (ID: {{ system_cfg.id }}) already exists on Proxmox hypervisor.
          To avoid data loss, the playbook will not overwrite or delete existing VMs.
          Please choose a different hostname or VM ID, or remove the existing VM manually before proceeding.
        quiet: true

    - name: Check if VM already exists in vCenter
      when: hypervisor == "vmware"
      delegate_to: localhost
      community.vmware.vmware_guest_info:
        hostname: "{{ hypervisor_url }}"
        username: "{{ hypervisor_username }}"
        password: "{{ hypervisor_password }}"
        validate_certs: "{{ hypervisor_validate_certs }}"
        datacenter: "{{ hypervisor_datacenter }}"
        name: "{{ hostname }}"
        folder: "{{ system_cfg.path if system_cfg.path | length > 0 else omit }}"
      register: system_check_vmware_check_result
      failed_when: false
      changed_when: false

    - name: Fail if vCenter lookup failed unexpectedly
      when: hypervisor == "vmware"
      ansible.builtin.assert:
        that:
          - not system_check_vmware_check_result.failed
            or (system_check_vmware_check_result.msg is search('non-existing VM'))
        fail_msg: |
          Unable to verify VM existence in vCenter.
          {{ system_check_vmware_check_result.msg | default('Unknown error') }}
        quiet: true

    - name: Abort if VM already exists in vCenter
      when: hypervisor == "vmware"
      ansible.builtin.assert:
        that:
          - system_check_vmware_check_result.instance is not defined
        fail_msg: |
          VM {{ hostname }} already exists in vCenter.
          To avoid data loss, the playbook will not overwrite or delete existing VMs.
          Please choose a different hostname or remove the existing VM manually before proceeding.
        quiet: true

    - name: Check if VM already exists on Xen
      when: hypervisor == "xen"
      delegate_to: localhost
      ansible.builtin.command:
        argv:
          - xl
          - list
      register: system_check_xen_existing_vms
      changed_when: false
      failed_when: false

    - name: Abort if VM already exists on Xen
      when: hypervisor == "xen"
      ansible.builtin.assert:
        that:
          - hostname not in system_check_xen_existing_vms.stdout | default('')
        fail_msg: |
          VM {{ hostname }} already exists on Xen hypervisor.
          To avoid data loss, the playbook will not overwrite or delete existing VMs.
          Please choose a different hostname or remove the existing VM manually before proceeding.
        quiet: true