#!/bin/bash
# grow-swap2.sh — add a second 4G swapfile on the Cloudron host [#755]
# Founder-approved 2026-09-03. Second-file approach: no swapoff, no restart,
# zero risk to the running fleet. Idempotent — safe to re-run.
#
# Applied live on my.knownelement.com 2026-09-03 (result: /apps.swap +
# /apps.swap2 = 8G total, fstab persisted). Re-runnable on any host that
# needs the same headroom; set NEW/SIZE_MB to taste.
set -euo pipefail

NEW=/apps.swap2
SIZE_MB=4096

if swapon --show=NAME --noheadings | grep -qx "$NEW"; then
  echo "$NEW already active"
else
  if [ -e "$NEW" ]; then
    echo "ERROR: $NEW exists but is not active — inspect manually" >&2
    exit 1
  fi
  fallocate -l "${SIZE_MB}M" "$NEW" 2>/dev/null \
    || dd if=/dev/zero of="$NEW" bs=1M count="$SIZE_MB" status=none
  chmod 600 "$NEW"
  mkswap "$NEW"
  swapon "$NEW"
  echo "activated $NEW"
fi

if grep -q "^$NEW " /etc/fstab; then
  echo "fstab entry already present"
else
  printf '%s none swap sw 0 0\n' "$NEW" >> /etc/fstab
  echo "fstab entry added"
fi

echo "--- swapon ---"
swapon --show
echo "--- free ---"
free -h