#!/bin/bash
set -euo pipefail

if [[ ${EUID} -ne 0 ]]; then
    echo "Run as root" >&2
    exit 1
fi

apt-get update
DEBIAN_FRONTEND=noninteractive apt-get install -y docker.io rustup build-essential pkg-config
systemctl enable --now docker

TARGET_USER="${SUDO_USER:-root}"
if [[ "$TARGET_USER" == "root" ]]; then
    rustup default stable
    cargo install cross --locked
else
    sudo -u "$TARGET_USER" -H sh -c 'rustup default stable && cargo install cross --locked'
fi

echo "Docker + rustup + cross installed for $TARGET_USER."
echo "Use BUILD_MODE=cross-binary only for development validation."