#!/usr/bin/env bash
# phase6_8_chroot.sh
# LFS 12.2 阶段6~8完整系统自动构建
set -euo pipefail
IFS=$'\n\t'

LFS_WORKDIR="$PWD/lfs_build"
CPU_CORES="$(nproc)"
LFS_SRC="$LFS_WORKDIR/sources"
ROOTFS="$LFS_WORKDIR/rootfs"
info(){ echo -e "\e[34m[INFO]\e[0m $*"; }

# 挂载虚拟文件系统
info "挂载 /proc /sys /dev ..."
mkdir -p "$ROOTFS"/{proc,sys,dev}
mount --bind /dev "$ROOTFS"/dev
mount --bind /dev/pts "$ROOTFS"/dev/pts
mount -t proc proc "$ROOTFS"/proc
mount -t sysfs sys "$ROOTFS"/sys

# 阶段6~8官方包顺序（部分示例）
PACKAGES=(
"bash"
"coreutils"
"diffutils"
"file"
"findutils"
"gawk"
"grep"
"gzip"
"make"
"patch"
"sed"
"tar"
"xz"
"perl"
"tcl"
"vim"
)

for pkg in "${PACKAGES[@]}"; do
    info "构建阶段6~8包: $pkg"
    src=$(ls "$LFS_SRC" | grep "$pkg")
    [ -f "$src" ] || { echo "源码 $pkg 未找到"; exit 1; }
    rm -rf "$pkg-build"
    mkdir "$pkg-build"
    tar xf "$LFS_SRC/$src" -C "$pkg-build" --strip-components=1
    cd "$pkg-build"

    # Patch
    for patchf in "$LFS_SRC"/*.patch; do
        patch -Np1 < "$patchf" 2>/dev/null || true
    done

    # chroot 编译
    chroot "$ROOTFS" /bin/bash -c "
        cd /tmp/$pkg-build
        ./configure --prefix=/usr
        make -j$CPU_CORES
        make install
    "
    cd "$LFS_BUILD"
    rm -rf "$pkg-build"
done

# 安装内核 & grub
info "安装内核和 grub ..."
chroot "$ROOTFS" /bin/bash -c "
    cd /tmp
    tar xf /build/linux-6.6.10.tar.xz
    cd linux-6.6.10
    make defconfig
    make -j$CPU_CORES
    make modules_install
    cp arch/x86/boot/bzImage /boot/vmlinuz
"
chroot "$ROOTFS" grub-install /dev/sda

info "阶段6~8完整系统构建完成"