#!/bin/sh

# Script for building OpenWRT .ipk packages using tar by iamromulan
# Works with SDXPPINN OpenWRT - iamromulan
# This script accepts an optional path to the directory containing the `CONTROL` and `root` directories.
# Usage: ./build-ipk.sh [path]
# If no path is provided, the script will look in the current directory for `CONTROL` and `root` directories.
# This will spit out an ipk in the current directory

# Check if the script is run as root. If not, rerun with sudo.
if [ "$(id -u)" -ne 0 ]; then
    echo "Script is not running as root. Re-executing with sudo..."
    exec sudo "$0" "$@"
fi

# Set the default build path to the current directory
build_path="."

# Check if a path is provided as the first argument
if [ "$1" ]; then
    build_path="$1"
fi

# Check if the required directories are present in the specified path
if [ ! -d "${build_path}/CONTROL" ] || [ ! -d "${build_path}/root" ]; then
    echo "Error: CONTROL and root directories must be present in the specified path (${build_path})."
    exit 1
fi

# Extract values from the CONTROL/control file in the specified path
pkgname=$(grep -i '^Package:' "${build_path}/CONTROL/control" | awk '{print $2}')
version=$(grep -i '^Version:' "${build_path}/CONTROL/control" | awk '{print $2}')
architecture=$(grep -i '^Architecture:' "${build_path}/CONTROL/control" | awk '{print $2}')

# Check if values are extracted correctly
if [ -z "$pkgname" ] || [ -z "$version" ] || [ -z "$architecture" ]; then
    echo "Error: Failed to extract Package, Version, or Architecture from ${build_path}/CONTROL/control."
    exit 1
fi

# Set the final IPK name based on the extracted values
ipkname="${pkgname}_${version}_${architecture}.ipk"

# Ensure all CONTROL scripts are executable
echo "Setting permissions for CONTROL scripts..."
chmod +x "${build_path}/CONTROL"/*

# Set ownership for CONTROL and root files
echo "Setting ownership for all package files..."
chown -R root:root "${build_path}/CONTROL"/*
chown -R root:root "${build_path}/root"/*

# Create control.tar.gz from the CONTROL directory
echo "Creating control.tar.gz..."
tar -czvf control.tar.gz -C "${build_path}/CONTROL" .

# Create data.tar.gz from the root directory
echo "Creating data.tar.gz..."
tar -czvf data.tar.gz -C "${build_path}/root" .

# Create debian-binary file (must contain exactly "2.0" without a newline)
echo -n "2.0" > debian-binary
chown -R root:root debian-binary

# Combine the components into the final .ipk file using tar
echo "Packaging ${ipkname}..."
tar -czvf "$ipkname" debian-binary control.tar.gz data.tar.gz

# Clean up intermediate files
echo "Cleaning up temporary files..."
rm -f control.tar.gz data.tar.gz debian-binary

echo "IPK package ${ipkname} created successfully using tar."