---
- hosts: fnos
  gather_facts: no
  become: yes
  vars:
    src_bases:
      fn-home: "/vol00/HGST HSH721414ALE6M4"
      fn-tower: "/vol00/HSH721414ALN6M0"
  tasks:
    - name: Deploy fixed auto-bind script
      ansible.builtin.copy:
        dest: /usr/local/bin/auto-bind-same-dirs.sh
        mode: "0755"
        content: |
          #!/bin/bash
          set -euo pipefail

          SRC_BASE="{{ src_bases[inventory_hostname] }}"
          DST_BASE="/vol1/1000"
          LOG_TAG="auto-bind-same-dirs"

          logger -t "$LOG_TAG" "start"

          if [ ! -d "$SRC_BASE" ]; then
              logger -t "$LOG_TAG" "source base not found: $SRC_BASE"
              exit 0
          fi

          if [ ! -d "$DST_BASE" ]; then
              logger -t "$LOG_TAG" "target base not found: $DST_BASE"
              exit 0
          fi

          find "$DST_BASE" -mindepth 1 -maxdepth 1 -type d | while read -r dst_dir; do
              name="$(basename "$dst_dir")"
              src_dir="$SRC_BASE/$name"

              if [ -d "$src_dir" ]; then
                  if mountpoint -q "$dst_dir" && stat "$dst_dir/." >/dev/null 2>&1; then
                      logger -t "$LOG_TAG" "skip already mounted: $dst_dir"
                  else
                      umount "$dst_dir" 2>/dev/null || true
                      mount --bind "$src_dir" "$dst_dir"
                      logger -t "$LOG_TAG" "mounted $src_dir -> $dst_dir"
                  fi
              fi
          done

          logger -t "$LOG_TAG" "done"
          exit 0

    - name: Deploy service unit
      ansible.builtin.copy:
        dest: /etc/systemd/system/auto-bind-same-dirs.service
        mode: "0644"
        content: |
          [Unit]
          Description=Bind mount NAS directories

          [Service]
          Type=oneshot
          ExecStart=/usr/local/bin/auto-bind-same-dirs.sh

    - name: Deploy timer unit
      ansible.builtin.copy:
        dest: /etc/systemd/system/auto-bind-same-dirs.timer
        mode: "0644"
        content: |
          [Unit]
          Description=Periodic bind mount check for external disks

          [Timer]
          OnBootSec=15s
          OnUnitActiveSec=60s

          [Install]
          WantedBy=timers.target

    - name: Stop and disable old path unit
      ansible.builtin.systemd:
        name: auto-bind-same-dirs.path
        state: stopped
        enabled: false
      failed_when: false

    - name: Remove old path unit file
      ansible.builtin.file:
        path: /etc/systemd/system/auto-bind-same-dirs.path
        state: absent

    - name: systemd daemon-reload
      ansible.builtin.systemd:
        daemon_reload: true

    - name: Reset any failed state on auto-bind units
      ansible.builtin.command:
        cmd: systemctl reset-failed auto-bind-same-dirs.service auto-bind-same-dirs.timer
      failed_when: false
      changed_when: false

    - name: Enable and start timer
      ansible.builtin.systemd:
        name: auto-bind-same-dirs.timer
        enabled: true
        state: started