---
# ============================================================================
# expand-root-lv / main
# ----------------------------------------------------------------------------
# 0. Ensure growpart is available (cloud-guest-utils provides the growpart binary)
# 1. Grow the partition (growpart) if a PV partition device is defined
# 2. Resize the physical volume (pvresize) to pick up the new partition size
# 3. Confirm the target VG exists (skip role cleanly on non-LVM hosts).
# 4. Read free physical-extent count for the VG.
# 5. Extend the LV to +100%FREE only when free_pe > 0.
# 6. Grow the filesystem on the mountpoint (ext4 -> resize2fs, xfs -> xfs_growfs).
# Each step is idempotent and skips when there's nothing to do.
# ============================================================================

# ---------------------------------------------------------------------------
# Step 0: Ensure growpart is available
# ---------------------------------------------------------------------------
- name: Ensure cloud-guest-utils (growpart) is installed
  ansible.builtin.package:
    name: cloud-guest-utils
    state: present
  when: expand_root_lv_pv_partition is defined
  tags: [growpart, always]

# ---------------------------------------------------------------------------
# Step 1: Grow the partition that backs the PV
# ---------------------------------------------------------------------------
# growpart expects: growpart <device> <partition_number>
# e.g. growpart /dev/sda 3  — NOT growpart /dev/sda3
# We split expand_root_lv_pv_partition (e.g. /dev/sda3) into device and part_no.

- name: Derive device and partition number from PV partition path
  ansible.builtin.set_fact:
    expand_root_lv_pv_device: "{{ expand_root_lv_pv_partition | regex_replace('p?(\\d+)$', '') }}"
    expand_root_lv_pv_part_no: "{{ expand_root_lv_pv_partition | regex_replace('.*p?(\\d+)$', '\\1') }}"
  when: expand_root_lv_pv_partition is defined
  tags: [growpart, always]

- name: Grow partition to fill disk (growpart)
  ansible.builtin.command:
    cmd: "growpart {{ expand_root_lv_pv_device }} {{ expand_root_lv_pv_part_no }}"
  register: growpart_result
  when: expand_root_lv_pv_partition is defined
  changed_when: growpart_result.rc == 0 and "NO CHANGE" not in growpart_result.stdout
  tags: [growpart, always]

# ---------------------------------------------------------------------------
# Step 2: Resize the physical volume to claim the new partition space
# ---------------------------------------------------------------------------
- name: Resize physical volume (pvresize)
  ansible.builtin.command:
    cmd: "pvresize {{ expand_root_lv_pv_partition }}"
  register: pvresize_result
  when: expand_root_lv_pv_partition is defined
  changed_when: pvresize_result.rc == 0
  tags: [pvresize, always]

# ---------------------------------------------------------------------------
# Step 3: Confirm the target VG exists (skip role cleanly on non-LVM hosts).
# ---------------------------------------------------------------------------
- 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
  tags: [lvm, always]

- name: Skip role when target VG is absent
  ansible.builtin.meta: end_play
  when: vg_info.rc != 0
  tags: [lvm, always]

# ---------------------------------------------------------------------------
# Step 4: Parse free PE count for the VG
# ---------------------------------------------------------------------------
- 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 }}"
  tags: [lvm, always]

# ---------------------------------------------------------------------------
# Step 5: Extend the LV to +100%FREE only when free_pe > 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
  tags: [lvm, always]

# ---------------------------------------------------------------------------
# Step 6: Detect filesystem type at mountpoint and grow
# ---------------------------------------------------------------------------
- name: Detect filesystem type at mountpoint
  ansible.builtin.command:
    cmd: "findmnt {{ expand_root_lv_mountpoint }} -no FSTYPE"
  register: fstype_result
  changed_when: false
  tags: [filesystem, always]

- name: Set filesystem type fact
  ansible.builtin.set_fact:
    expand_root_lv_fstype: "{{ fstype_result.stdout | trim }}"
  tags: [filesystem, always]

- 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"
    - (growpart_result is defined and growpart_result.changed) or
      (pvresize_result is defined and pvresize_result.changed) or
      (lvextend_result is defined and lvextend_result.changed) or
      (growpart_result is not defined)
  changed_when: resize_result.rc == 0
  tags: [filesystem, always]

- name: Grow xfs filesystem
  ansible.builtin.command:
    cmd: "xfs_growfs {{ expand_root_lv_mountpoint }}"
  register: xfs_result
  when:
    - expand_root_lv_fstype == "xfs"
    - (growpart_result is defined and growpart_result.changed) or
      (pvresize_result is defined and pvresize_result.changed) or
      (lvextend_result is defined and lvextend_result.changed) or
      (growpart_result is not defined)
  changed_when: xfs_result.rc == 0
  tags: [filesystem, always]

# ---------------------------------------------------------------------------
# Step 7: Report current root size
# ---------------------------------------------------------------------------
- name: Report current root size
  ansible.builtin.command:
    cmd: "df -h {{ expand_root_lv_mountpoint }}"
  register: df_result
  changed_when: false
  tags: [always]

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