#!/bin/sh

set -e

PREREQ=""

prereqs()
{
    echo "$PREREQ"
}

case "$1" in
prereqs)
    prereqs
    exit 0
    ;;
esac

. /usr/share/initramfs-tools/hook-functions

amlramfs=/usr/local/amlramfs
modules_dir=/lib/modules/
echo "Installing custom ramfs... ${version}"

#
# 1. 替换默认 init
#
mkdir -p "${DESTDIR}"
cp "${DESTDIR}/init" "/usr/local/init_back"
mv "${DESTDIR}/init" "${DESTDIR}/init2"
cp -a "${amlramfs}/init" \
      "${DESTDIR}/init"

chmod 755 "${DESTDIR}/init"

#
# 3. 拷贝模块
#
ramdisk_source="/lib/modules/${version}/modules/ramdisk"
ramdisk_order="${ramdisk_source}/ramdisk_modules.order"
ramdisk_installer="${ramdisk_source}/ramdisk_install.sh"
ramdisk_target="${DESTDIR}/modules/ramdisk"

if [ ! -f "${ramdisk_order}" ]; then
    echo "ERROR: ramdisk module list missing: ${ramdisk_order}" >&2
    exit 1
fi

if [ ! -f "${ramdisk_installer}" ]; then
    echo "ERROR: ramdisk installer missing: ${ramdisk_installer}" >&2
    exit 1
fi

echo "Installing ramdisk modules ..."
mkdir -p "${ramdisk_target}" || exit 1
cp -a "${ramdisk_order}" "${ramdisk_installer}" "${ramdisk_target}/" || exit 1

while IFS= read -r module; do
    [ -n "${module}" ] || continue

    module_path="$(find "/lib/modules/${version}/kernel" \
        -type f -name "${module}" -print -quit)"

    if [ -z "${module_path}" ]; then
        echo "ERROR: ramdisk module missing from kernel tree: ${module}" >&2
        exit 1
    fi

    cp -a "${module_path}" "${ramdisk_target}/${module}" || exit 1
done < "${ramdisk_order}"

# 修复 init 脚本依赖的工具
copy_exec /bin/grep      # 用于 upstream_emmc_mount()
copy_exec /usr/bin/expr  # 用于 read_args()

# 文本处理工具
copy_exec /bin/sed       # 可能被其他脚本使用
copy_exec /bin/mawk       # 通用文本处理
ln -sf mawk ${DESTDIR}/usr/bin/awk

# 编辑器
copy_exec /usr/bin/vim.tiny    # vi 编辑器
copy_exec /bin/nano      # 简单的替代编辑器

# 文件查看工具
copy_exec /usr/bin/less  # 更好的文件查看
copy_exec /bin/more      # 基础文件查看

echo "Custom ramfs installed."