Linux Systemd (.timer & .service) Unit Generator

#!/usr/bin/env bash
# ==============================================================================
# Linux Systemd Unit Installer: db-backup.timer & db-backup.service
# Auto-generated by ToolsAA (https://toolsaa.com)
# ==============================================================================
set -euo pipefail

echo "=========================================================="
echo " [ToolsAA] Deploying Systemd Timer: db-backup"
echo "=========================================================="

if [ "$EUID" -ne 0 ]; then
  echo "[-] Error: Root privileges required. Re-run with: sudo bash $0" >&2
  exit 1
fi

TARGET_DIR="/etc/systemd/system"

# 1. Write companion service unit
echo "[+] Installing ${TARGET_DIR}/db-backup.service..."
cat << 'EOF' > "${TARGET_DIR}/db-backup.service"
[Unit]
Description=Daily Off-Peak Database Dump and Sync
Documentation=man:systemd.service(5)
After=network.target network-online.target
Wants=network-online.target

[Service]
Type=oneshot
ExecStart=/usr/local/bin/backup-db.sh --all --compress --dest /var/backups
WorkingDirectory=/var/backups
User=postgres
Group=postgres
TimeoutStartSec=1h
Nice=10

# Hardening & Sandboxing
NoNewPrivileges=true
ProtectSystem=full
ProtectHome=read-only
PrivateTmp=true
StandardOutput=journal
StandardError=journal
SyslogIdentifier=db-backup
EOF

# 2. Write timer unit
echo "[+] Installing ${TARGET_DIR}/db-backup.timer..."
cat << 'EOF' > "${TARGET_DIR}/db-backup.timer"
[Unit]
Description=Timer for Daily Off-Peak Database Dump and Sync
Documentation=man:systemd.timer(5)

[Timer]
OnCalendar=*-*-* 02:30:00
Persistent=true
RandomizedDelaySec=15m
AccuracySec=1m
Unit=db-backup.service

[Install]
WantedBy=timers.target
EOF

# 3. Apply secure unit file permissions (644)
chmod 644 "${TARGET_DIR}/db-backup.service" "${TARGET_DIR}/db-backup.timer"

# 4. Reload systemd daemon
echo "[+] Reloading systemd manager configuration..."
systemctl daemon-reload

# 5. Enable and immediately activate the timer
echo "[+] Enabling and starting db-backup.timer..."
systemctl enable --now "db-backup.timer"

# 6. Verify timer status and list upcoming triggers
echo ""
echo "=========================================================="
echo " [✓] Deployment Complete! Next Scheduled Executions:"
echo "=========================================================="
systemctl list-timers --all | grep -E "db-backup|NEXT" || true
echo ""
echo "To test service execution immediately:"
echo "  sudo systemctl start db-backup.service"
echo "To view execution logs:"
echo "  journalctl -u db-backup.service -f"