# check_raid.yml

- name: Check Linux MD RAID health on VM via Proxmox
  hosts: linux_servers
  gather_facts: false
  become: true
  become_user: root
  become_method: sudo

  vars:
    # VM connection (provided by Semaphore env vars)
    vm_ip:   "{{ lookup('env', 'VM_IP') }}"
    vm_user: "{{ lookup('env', 'VM_USER') }}"
    vm_pass: "{{ lookup('env', 'VM_PASS') }}"
    use_sudo: false

    # --- Debug mode (controlled via Semaphore variable) ---
    DEBUG: "{{ lookup('env', 'DEBUG') | default(0) | int }}"
    RETRIES: "{{ lookup('env', 'RETRIES') | default(25) | int }}"

    # --- RAID specifics ---
    # RAID_MD can be: md0 / md1 / ... OR "auto" to check all arrays found in /proc/mdstat
    raid_md_device: "{{ lookup('env', 'RAID_MD') | default('md0', true) }}"
    # 1 = allow resync/recovery/reshape/check/repair; 0 = fail when such activity is detected
    raid_allow_sync: "{{ lookup('env', 'RAID_ALLOW_SYNC') | default(1, true) | int }}"
    # 1 = do not fail when no MD arrays exist on the target
    raid_allow_no_array: "{{ lookup('env', 'RAID_ALLOW_NO_ARRAY') | default(0, true) | int }}"

    # Retry policy
    raid_retries: "{{ RETRIES }}"
    raid_delay: 2

    # Hard timeout for the whole SSH command (prevents hanging forever)
    ssh_hard_timeout: 30

    # SSH options (same style, but avoids auth prompts)
    ssh_opts:
      - "-o"  # English comments
      - "StrictHostKeyChecking=no"
      - "-o"
      - "UserKnownHostsFile=/dev/null"
      - "-o"
      - "ConnectTimeout=15"
      - "-o"
      - "PreferredAuthentications=password"
      - "-o"
      - "PubkeyAuthentication=no"
      - "-o"
      - "KbdInteractiveAuthentication=no"
      - "-o"
      - "NumberOfPasswordPrompts=1"

    # Commands to run on the target VM
    raid_commands:
      - |
        python3 - <<'PY'
        # Parse /proc/mdstat and validate MD RAID state
        import re, sys

        target = "{{ raid_md_device }}"
        allow_sync = int("{{ raid_allow_sync }}")
        allow_no_array = int("{{ raid_allow_no_array }}")

        try:
            txt = open("/proc/mdstat", "r", encoding="utf-8", errors="ignore").read()
        except Exception as e:
            print(f"ERROR: cannot read /proc/mdstat: {e}")
            sys.exit(2)

        # Find all md arrays present
        # We parse tokens like: [2/2] [UU]
        arrays = {}
        header_re = re.compile(r"^(md\d+)\s*:\s*active.*$", re.MULTILINE)
        token_re = re.compile(r"^\s*\d+\s+blocks.*\[\d+/\d+\]\s*\[([U_]+)\]\s*$", re.MULTILINE)

        for m in header_re.finditer(txt):
            name = m.group(1)
            start = m.end()
            # Look ahead for the next token line after this header
            chunk = txt[start:start + 3000]
            tm = token_re.search(chunk)
            if tm:
                arrays[name] = tm.group(1)

        if not arrays:
            msg = "NO_MD_ARRAYS: /proc/mdstat contains no active md arrays."
            print(msg)
            print(txt.strip())
            sys.exit(0 if allow_no_array else 2)

        syncing = bool(re.search(r"\b(resync|recovery|reshape|check|repair)\b", txt))

        # Decide which arrays to check
        if target == "auto":
            to_check = sorted(arrays.keys())
        else:
            if target not in arrays:
                print(f"ERROR: {target} not found in /proc/mdstat. Found={sorted(arrays.keys())}")
                print(txt.strip())
                sys.exit(2)
            to_check = [target]

        bad = []
        for name in to_check:
            token = arrays[name]
            degraded = "_" in token
            bad.append((name, token, degraded))

        # Print summary
        for name, token, degraded in bad:
            print(f"RAID={name} token=[{token}] degraded={degraded} syncing={syncing} allow_sync={allow_sync}")

        # Fail conditions
        if any(degraded for _, _, degraded in bad):
            sys.exit(1)

        if syncing and not allow_sync:
            sys.exit(1)

        sys.exit(0)
        PY

  tasks:
    - name: Ensure sshpass is installed (for password-based SSH)  # English comments
      ansible.builtin.apt:
        name: sshpass
        state: present
        update_cache: yes

    - name: Run RAID check commands on VM (via SSH)  # use SSHPASS env, hide item label
      ansible.builtin.command:
        argv: >-
          {{
            ['timeout', '-k', '5', (ssh_hard_timeout | string)]
            + ['sshpass', '-e', 'ssh']
            + ssh_opts
            + [ vm_user ~ '@' ~ vm_ip,
                'bash', '-lc',
                ('sudo ' if use_sudo else '') + item
              ]
          }}
      environment:
        SSHPASS: "{{ vm_pass }}"
      loop: "{{ raid_commands }}"
      loop_control:
        index_var: idx
        label: "cmd-{{ idx }}"
      register: raid_cmds
      changed_when: false
      failed_when: false
      no_log: "{{ DEBUG == 0 }}"
      retries: "{{ raid_retries }}"
      delay: "{{ raid_delay }}"
      until: raid_cmds.rc not in [124, 255]

    - name: Show outputs for each RAID command
      ansible.builtin.debug:
        msg: |
          CMD: {{ item.item | default('n/a') }}
          RC:  {{ item.rc }}
          STDOUT:
          {{ (item.stdout | default('')).strip() }}
          STDERR:
          {{ (item.stderr | default('')).strip() }}
      loop: "{{ (raid_cmds.results if (raid_cmds.results is defined) else [raid_cmds]) }}"
      when: DEBUG == 1

    - name: Fail play if RAID check failed  # English comments
      ansible.builtin.assert:
        that: "item.rc == 0"
        fail_msg: "RAID check failed on VM: {{ (item.stdout | default(item.stderr) | default('no output')) | trim }}"
        success_msg: "RAID check OK."
      loop: "{{ (raid_cmds.results if (raid_cmds.results is defined) else [raid_cmds]) }}"
      loop_control:
        index_var: idx
        label: "cmd-{{ idx }}"