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ading2210
GitHub Repository: ading2210/shimboot
 Path: blob/main/patch_rootfs.sh
402 views
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#!/bin/bash

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#patch the target rootfs to add any needed drivers

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. ./common.sh

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. ./image_utils.sh

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print_help() {

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  echo "Usage: ./patch_rootfs.sh shim_path reco_path rootfs_dir"

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}

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assert_root

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assert_deps "git gunzip depmod"

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assert_args "$3"

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copy_modules() {

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  local shim_rootfs=$(realpath -m $1)

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  local reco_rootfs=$(realpath -m $2)

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  local target_rootfs=$(realpath -m $3)

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  rm -rf "${target_rootfs}/lib/modules"

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  cp -r "${shim_rootfs}/lib/modules" "${target_rootfs}/lib/modules"

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  mkdir -p "${target_rootfs}/lib/firmware"

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  cp -r --remove-destination "${shim_rootfs}/lib/firmware/"* "${target_rootfs}/lib/firmware/"

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  cp -r --remove-destination "${reco_rootfs}/lib/firmware/"* "${target_rootfs}/lib/firmware/"

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  mkdir -p "${target_rootfs}/lib/modprobe.d/"

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  mkdir -p "${target_rootfs}/etc/modprobe.d/"

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  cp -r "${reco_rootfs}/lib/modprobe.d/"* "${target_rootfs}/lib/modprobe.d/"

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  cp -r "${reco_rootfs}/etc/modprobe.d/"* "${target_rootfs}/etc/modprobe.d/"

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  #decompress kernel modules if necessary - debian won't recognize these otherwise

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  local compressed_files="$(find "${target_rootfs}/lib/modules" -name '*.gz')"

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  if [ "$compressed_files" ]; then

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    echo "$compressed_files" | xargs gunzip

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    for kernel_dir in "$target_rootfs/lib/modules/"*; do

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      local version="$(basename "$kernel_dir")"

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      depmod -b "$target_rootfs" "$version"

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    done

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  fi

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}

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copy_firmware() {

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  local firmware_path="/tmp/chromium-firmware"

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  local target_rootfs=$(realpath -m $1)

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  if [ ! -e "$firmware_path" ]; then

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    download_firmware $firmware_path

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  fi

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  cp -r --remove-destination "${firmware_path}/"* "${target_rootfs}/lib/firmware/"

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}

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download_firmware() {

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  local firmware_url="https://chromium.googlesource.com/chromiumos/third_party/linux-firmware"

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  local firmware_path=$(realpath -m $1)

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  git clone --branch master --depth=1 "${firmware_url}" $firmware_path

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}

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shim_path=$(realpath -m $1)

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reco_path=$(realpath -m $2)

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target_rootfs=$(realpath -m $3)

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shim_rootfs="/tmp/shim_rootfs"

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reco_rootfs="/tmp/reco_rootfs"

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echo "mounting shim"

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shim_loop=$(create_loop "${shim_path}")

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safe_mount "${shim_loop}p3" $shim_rootfs ro

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echo "mounting recovery image"

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reco_loop=$(create_loop "${reco_path}")

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safe_mount "${reco_loop}p3" $reco_rootfs ro

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echo "copying modules to rootfs"

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copy_modules $shim_rootfs $reco_rootfs $target_rootfs

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echo "downloading misc firmware"

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copy_firmware $target_rootfs

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echo "unmounting and cleaning up"

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umount $shim_rootfs

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umount $reco_rootfs

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losetup -d $shim_loop

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losetup -d $reco_loop

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echo "done"

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