Automatic Linux Install rEFInd

#!/bin/bash

# A script to automate the download and installation of rEFInd on Linux.
# This script must be run with sudo or as root.
#
# MODIFICATION 2: Corrected the flag for specifying the EFI partition.
# The correct flag is "--usedefault {device}" not "--device {device}".

# --- Configuration ---
REFIND_VERSION="0.14.2"
DOWNLOAD_URL="https://sourceforge.net/projects/refind/files/${REFIND_VERSION}/refind-bin-${REFIND_VERSION}.zip/download"
TEMP_DIR="/tmp/refind-install-$$"
EFI_DEVICE="/dev/sda1" # Your confirmed EFI partition

# --- Functions ---

# Function to check for root privileges
check_root() {
    if [ "$EUID" -ne 0 ]; then
        echo "Error: This script must be run as root. Please use sudo."
        exit 1
    fi
}

# Function to check for UEFI boot mode
check_uefi() {
    if [ ! -d "/sys/firmware/efi" ]; then
        echo "Error: System not booted in UEFI mode. rEFInd requires UEFI."
        exit 1
    fi
}

# Function for cleanup
cleanup() {
    echo "Cleaning up temporary files..."
    rm -rf "$TEMP_DIR"
}

# --- Main Script Logic ---

# Ensure script exits if any command fails
set -e

# Trap CTRL+C and other signals for cleanup
trap cleanup EXIT

# 1. Initial Checks
check_root
check_uefi

echo "rEFInd Installer for Linux (Acer Specific - Corrected)"
echo "----------------------------------------------------"
echo "Targeting EFI Partition: $EFI_DEVICE"

# 2. Check/Install Dependencies
if ! command -v curl &> /dev/null || ! command -v unzip &> /dev/null; then
    echo "curl and/or unzip not found. Attempting to install..."
    if command -v apt-get &> /dev/null; then
        apt-get update
        apt-get install -y curl unzip
    else
        echo "Error: Cannot automatically install dependencies. Please install curl and unzip manually."
        exit 1
    fi
fi

# 3. Download and Extract rEFInd
mkdir -p "$TEMP_DIR"
cd "$TEMP_DIR"

echo "Downloading rEFInd version $REFIND_VERSION..."
curl -L -o refind.zip "$DOWNLOAD_URL"
echo "Extracting archive..."
unzip -q refind.zip

# Find the extracted directory name
EXTRACTED_DIR=$(ls -d refind-bin-*/)

# 4. Run the official rEFInd installation script
cd "$EXTRACTED_DIR"
echo "Running the official refind-install script on $EFI_DEVICE..."

# THIS IS THE CORRECTED COMMAND:
./refind-install --usedefault $EFI_DEVICE

if [ $? -eq 0 ]; then
    echo ""
    echo -e "\e[32m rEFInd has been installed successfully! \e[0m"
    echo "On next boot, rEFInd should appear as the default boot manager."
else
    echo ""
    echo -e "\e[31m The refind-install script reported an error. \e[0m"
fi

# Cleanup is handled by the trap at the beginning

exit 0