#!/bin/bash
# setup.sh - 解压构建工具链到内核仓库
#
# 用法:
#   ./setup.sh <内核仓库路径>
#
# 例:
#   git clone <toolchain-repo>
#   cd <toolchain-repo>
#   ./setup.sh ~/android_kernel_eebbk_sm6150
#
# 效果: 工具链解压到 <内核仓库路径>/../toolchain/ (与内核仓库同级)
#   <parent>/
#   ├── android_kernel_eebbk_sm6150/   <- 内核仓库
#   └── toolchain/
#       ├── android_prebuilts_clang_host_linux-x86_clang-6443078-10.0/
#       └── binutils-2.27-install/

set -e

if [ $# -lt 1 ]; then
    echo "用法: ./setup.sh <内核仓库路径>"
    echo "例:   ./setup.sh ~/android_kernel_eebbk_sm6150"
    exit 1
fi

KERNEL_DIR="$(cd "$1" && pwd)"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
TOOLCHAIN_DIR="$(dirname "$KERNEL_DIR")/toolchain"

if [ ! -d "$KERNEL_DIR/Makefile" ] && [ ! -f "$KERNEL_DIR/Makefile" ]; then
    echo "错误: $KERNEL_DIR 看起来不是内核源码目录 (没有 Makefile)"
    exit 1
fi

echo "=== 内核仓库: $KERNEL_DIR ==="
echo "=== 工具链安装到: $TOOLCHAIN_DIR ==="
mkdir -p "$TOOLCHAIN_DIR"

echo "=== 解压 binutils-2.27 (39MB) ==="
tar -xzf "$SCRIPT_DIR/binutils-2.27-install.tar.gz" -C "$TOOLCHAIN_DIR"
echo "完成"

echo "=== 解压 clang-11.0.1 (342MB, 请稍候) ==="
tar -xzf "$SCRIPT_DIR/clang-6443078.tar.gz" -C "$TOOLCHAIN_DIR"
echo "完成"

echo ""
echo "=== 工具链就绪 ==="
ls -d "$TOOLCHAIN_DIR"/android_prebuilts_clang_host_linux-x86_clang-6443078-10.0
ls -d "$TOOLCHAIN_DIR"/binutils-2.27-install
echo ""
echo "编译内核:"
echo "  cd $KERNEL_DIR"
echo "  export TC=$TOOLCHAIN_DIR"
echo "  export ARCH=arm64"
echo "  export CROSS_COMPILE=\$TC/binutils-2.27-install/bin/aarch64-linux-gnu-"
echo "  export CLANG=\$TC/android_prebuilts_clang_host_linux-x86_clang-6443078-10.0"
echo "  export PATH=\$CLANG/bin:\$PATH"
echo "  export LOCALVERSION=-perf"
echo "  make vendor/sdmsteppe-perf_defconfig"
echo "  make -j\$(nproc) CC=\"python3 ./scripts/gcc-wrapper.py \$CLANG/bin/aarch64-linux-gnu-clang\" HOSTCC=gcc HOSTCXX=g++"
echo "  gzip -n -9 -c arch/arm64/boot/Image > Image.gz"