---
# ============================================================================
# expand-root-lv / main
# ----------------------------------------------------------------------------
# 1. Confirm the target VG exists (skip role cleanly on non-LVM hosts).
# 2. Read free physical-extent count for the VG.
# 3. Extend the LV to +100%FREE only when free_pe > 0.
# 4. Grow the filesystem on the mountpoint (ext4 -> resize2fs, xfs -> xfs_growfs).
# Each step is idempotent and skips when there's nothing to do.
# ============================================================================

- name: Gather LVM facts
  ansible.builtin.command:
    cmd: "vgs --noheadings --nosuffix --units b -o vg_name,vg_free_count {{ expand_root_lv_vg_name }}"
  register: vg_info
  changed_when: false
  failed_when: false

- name: Skip role when target VG is absent
  ansible.builtin.meta: end_play
  when: vg_info.rc != 0

- name: Parse free PE count
  ansible.builtin.set_fact:
    expand_root_lv_free_pe: "{{ (vg_info.stdout.split() | last | int) if vg_info.stdout | length > 0 else 0 }}"

- name: Extend LV to fill VG (only if free PE > 0)
  ansible.builtin.command:
    cmd: "lvextend -l +100%FREE /dev/{{ expand_root_lv_vg_name }}/{{ expand_root_lv_lv_name }}"
  register: lvextend_result
  when: expand_root_lv_free_pe | int > 0
  changed_when: lvextend_result.rc == 0

- name: Detect filesystem type at mountpoint
  ansible.builtin.command:
    cmd: "findmnt {{ expand_root_lv_mountpoint }} -no FSTYPE"
  register: fstype_result
  changed_when: false

- name: Set filesystem type fact
  ansible.builtin.set_fact:
    expand_root_lv_fstype: "{{ fstype_result.stdout | trim }}"

- name: Grow ext4 filesystem
  ansible.builtin.command:
    cmd: "resize2fs /dev/{{ expand_root_lv_vg_name }}/{{ expand_root_lv_lv_name }}"
  register: resize_result
  when:
    - expand_root_lv_fstype == "ext4"
    - lvextend_result.changed | default(false)
  changed_when: resize_result.rc == 0

- name: Grow xfs filesystem
  ansible.builtin.command:
    cmd: "xfs_growfs {{ expand_root_lv_mountpoint }}"
  register: xfs_result
  when:
    - expand_root_lv_fstype == "xfs"
    - lvextend_result.changed | default(false)
  changed_when: xfs_result.rc == 0

- name: Report current root size
  ansible.builtin.command:
    cmd: "df -h {{ expand_root_lv_mountpoint }}"
  register: df_result
  changed_when: false

- name: Show post-resize disk usage
  ansible.builtin.debug:
    msg: "{{ df_result.stdout_lines }}"