setup-cron.sh

#!/usr/bin/env bash
# ─────────────────────────────────────────────────────────────────────────────
# setup-cron.sh  ·  dust-sync-3f74b8
# Registers (or updates) the keep-alive cronjob.
# Run once after cloning / setting up the project.
# ─────────────────────────────────────────────────────────────────────────────
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
KEEP_ALIVE="$SCRIPT_DIR/keep-alive.sh"
LOG_FILE="$SCRIPT_DIR/keep-alive.log"
CRON_TAG="dust-sync-3f74b8"   # unique identifier for this job

# ── Pre-flight checks ─────────────────────────────────────────────────────────
if [[ ! -f "$KEEP_ALIVE" ]]; then
  echo "[ERROR] keep-alive.sh not found at: $KEEP_ALIVE" >&2
  exit 1
fi

if [[ ! -f "$SCRIPT_DIR/.keep-alive.env" ]]; then
  echo "[ERROR] .keep-alive.env not found."
  echo "        Copy .keep-alive.env.example → .keep-alive.env and fill in your values."
  exit 1
fi

# Ensure script is executable
chmod +x "$KEEP_ALIVE"

# ── Install cron entry ────────────────────────────────────────────────────────
CRON_LINE="*/15 * * * *   $KEEP_ALIVE >> $LOG_FILE 2>&1  # $CRON_TAG"

# Dump existing crontab (ignore error when empty), remove old entry, add new
TMPFILE="$(mktemp)"
trap 'rm -f "$TMPFILE"' EXIT

crontab -l 2>/dev/null | grep -v "# $CRON_TAG" > "$TMPFILE" || true
echo "$CRON_LINE" >> "$TMPFILE"
crontab "$TMPFILE"

echo ""
echo "  Cronjob installed successfully."
echo "  ─────────────────────────────────────────────────"
echo "  Tag     : $CRON_TAG"
echo "  Script  : $KEEP_ALIVE"
echo "  Schedule: every 15 minutes"
echo "  Log     : $LOG_FILE"
echo "  ─────────────────────────────────────────────────"
echo ""
echo "  Active crontab:"
crontab -l | grep "$CRON_TAG"
echo ""
echo "  Run manually to test:"
echo "  bash $KEEP_ALIVE"