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#!/bin/sh
## Copyright 2022 Arnaud Ferraris <aferraris@debian.org>
##
## SPDX-License-Identifier: GPL-3.0-or-later
set -e
VERSION="$1"
if [ -z "${VERSION}" ]; then
echo "Usage: $0 VERSION"
exit 1
fi
BOOTPART="/dev/disk/by-partlabel/boot"
LATESTKERNEL="$(linux-version list | tail -1)"
# Only update the bootimg for the most recent kernel
if linux-version compare "${VERSION}" lt "${LATESTKERNEL}"; then
echo "I: Not updating bootimg for ${VERSION} < ${LATESTKERNEL}, quitting..."
exit 0
fi
# Fetch the device parameters
# shellcheck disable=SC2013
# Using a "for" loop for reading the kernel cmdline (single line containing
# multiple words) is more readable than a complex "while read" construct
for x in $(cat /proc/cmdline); do
case $x in
mobile.qcomsoc=*) QCOMSOC=${x#mobile.qcomsoc=} ;;
mobile.vendor=*) VENDOR=${x#mobile.vendor=} ;;
mobile.model=*) MODEL=${x#mobile.model=} ;;
mobile.variant=*) VARIANT=${x#mobile.variant=} ;;
esac
done
if [ -z "${MODEL}" ]; then
echo "Probably running in a VM, not updating bootimg..."
exit 0
fi
# Create the DTB file name from device parameters
if [ "${VARIANT}" ]; then
DTBNAME="${QCOMSOC}-${VENDOR}-${MODEL}-${VARIANT}"
else
DTBNAME="${QCOMSOC}-${VENDOR}-${MODEL}"
fi
echo "I: identified device ${DTBNAME}"
TMPDIR=$(mktemp -d /tmp/bootimg.XXXXXX)
if [ -e "${BOOTPART}_b" ]; then
# Check slot currently in use
BOOTPART="${BOOTPART}$(qbootctl -x)"
fi
echo "I: using ${BOOTPART} boot partition"
# Extract individual components (kernel, initrd, cmdline...) from the bootimg
# flashed to the current boot partition; using the `mkbootimg` format outputs
# to stdout all the command-line arguments we need to re-create this image.
dd if="${BOOTPART}" of="${TMPDIR}/boot.img" bs=1M
BOOTIMG_PARAMS="$(unpack_bootimg --format mkbootimg --out "${TMPDIR}" --boot_img "${TMPDIR}/boot.img")"
# The `cmdline` part of the arguments are quoted, but those will be discarded
# by the shell when reusing the params, so the kernel cmdline parameters will
# be interpreted as command-line arguments for `mkbootimg`, ultimately leading
# to an "unrecognized arguments" error.
# In order to avoid this, save the kernel cmdline in a separate variable and
# strip the `--cmdline` and `--board` (the latter being unused in our case)
# arguments from the params
CMDLINE="$(echo "${BOOTIMG_PARAMS}" | sed "s/.*--cmdline '\(.*\)'/\1/")"
CLEAN_PARAMS="$(echo "${BOOTIMG_PARAMS}" | sed -e "s/ --cmdline '.*'//" -e "s/ --board '.*'//")"
# Append the DTB to the kernel and copy the new initrd
cat "/boot/vmlinuz-${VERSION}" "/usr/lib/linux-image-${VERSION}/${DTBNAME}.dtb" > "${TMPDIR}/kernel"
cp "/boot/initrd.img-${VERSION}" "${TMPDIR}/ramdisk"
if echo "${CLEAN_PARAMS}" | grep -q -- "--header_version 2"; then
# Copy the DTB if needed
cp "/usr/lib/linux-image-${VERSION}/${DTBNAME}.dtb" "${TMPDIR}/dtb"
fi
# Create the new boot image
# shellcheck disable=SC2086
# $CLEAN_PARAMS mustn't be quoted as it is a params list, which must be
# interpreted as multiple different arguments rather than a single big one
mkbootimg -o "${TMPDIR}/boot.img" ${CLEAN_PARAMS} --cmdline "${CMDLINE}"
# Write the new boot image to disk
echo "I: writing boot image to ${BOOTPART}"
dd if="${TMPDIR}/boot.img" of="${BOOTPART}" bs=1M
# Cleanup and exit
rm -rf "${TMPDIR}"
|
