123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150 |
- #!/bin/sh
- # This file is part of PrawnOS (https://www.prawnos.com)
- # Copyright (c) 2018 Hal Emmerich <hal@halemmerich.com>
- # Copyright (c) 2020 Fil Bergamo <fil@filberg.eu>
- # PrawnOS is free software: you can redistribute it and/or modify
- # it under the terms of the GNU General Public License version 2
- # as published by the Free Software Foundation.
- # PrawnOS is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
- # You should have received a copy of the GNU General Public License
- # along with PrawnOS. If not, see <https://www.gnu.org/licenses/>.
- # -----------------------------------------------
- # STATIC CONFIGURATION
- # -----------------------------------------------
- #
- # eMMC device name
- emmc_devname=mmcblk2
- #
- # Actual kernel image (.kpart)
- kimg=./vmlinux.kpart
- #
- # GPT partition type UUID for "ChromeOS kernel"
- ptype_kernel="FE3A2A5D-4F32-41A7-B725-ACCC3285A309"
- #
- # Kernel partition number
- pnum_kernel=1
- # -----------------------------------------------
- # function die():
- # print an error message and exit with the provided code
- # $1 = error message
- # $2 = exit code
- die()
- {
- redtxt='\033[0;31m'
- printf "$redtxt$1\n"
- exit $2
- }
- # function get_partition_type_uuid()
- # print the UUID of the gpt partition type
- # for the given partition number on the given device
- # $1 = device (e.g. /dev/mmcblk2)
- # $2 = partition number
- get_partition_type_uuid()
- {
- cgpt show -i "$2" -t -n -q "$1" 2>/dev/null
- }
- # function get_root_partition()
- # print the actual physical device
- # currently mounted as "/"
- get_root_partition()
- {
- rootfs=$(findmnt / -n -o SOURCE)
- if echo "$rootfs" | grep -q "/dev/mapper" ;then
- # root filesystem is on luks volume
- # let's find the physical device behind it
- rootfs=$(cryptsetup status "$rootfs" | grep "device: " | cut -d ' ' -f 5)
- fi
- echo "$rootfs"
- }
- # ------------- BEGIN SCRIPT EXECUTION --------------------
- set -e
- # Check root or sudo
- [ ! $(id -u) = 0 ] &&
- die "Please run this script with sudo, or as root" 1
- rootfs=$(get_root_partition)
- devname=$(lsblk -no pkname $rootfs | head -n 1)
- devtype=
- kpart=
- case "$devname" in
- $emmc_devname)
- devtype="Internal eMMC"
- kpart=/dev/${devname}p$pnum_kernel
- ;;
- sd*)
- devtype="USB Stick"
- kpart=/dev/${devname}$pnum_kernel
- ;;
- mmcblk[0-9])
- devtype="External SD card"
- kpart=/dev/${devname}p$pnum_kernel
- ;;
- *)
- die "FAILED to recognize booted device type $devname" 127
- esac
- # Check that the selected partition is effectively of type "kernel"
- ptype=$(get_partition_type_uuid /dev/$devname $pnum_kernel)
- [ ! "$ptype" = "$ptype_kernel" ] &&
- die "FATAL ERROR: unexpected partitioning scheme found. Partition # $pnum_kernel is NOT the kernel partition!" 255
- # Check that the needed kernel images exist
- [ ! -e "$kimg" ] &&
- die "ERROR: cannot find kernel image at $kimg !" 127
- [ ! -e "$blnk" ] &&
- die "ERROR: cannot find blank image at $blnk !" 127
- # Prompt for user's confirmation
- echo "
- ----------------------------
- /!\\ !!! CAUTION !!! /!\\
- ----------------------------
- This will flash a new kernel image onto the running device's kernel partition: $kpart
- The detected running device is: $devtype.
- DO NOT shutdown or reboot before completing the process!
- "
- printf "%s" "Are you REALLY sure you want to continue??? [y/N] "
- read ans
- [ "$ans" != "y" ] &&
- [ "$ans" != "Y" ] &&
- die "Aborted by user. Kernel untouched." 1
- # put the kernel in the kernel partition
- #blank the kernel partition first, with 32MiB of zeros
- kernel_size=65536
- block_size=512
- dd if=/dev/zero of="$kpart" conv=notrunc bs=512 count=$kernel_size ||
- die "FAILED to flash blank kernel on $kpart!" 255
- dd if="$kimg" of="$kpart" conv=notrunc ||
- die "FAILED to flash kernel image on $kpart!" 255
- echo "
- The new kernel image has been successfully flashed onto $kpart.
- It's now safe to reboot."
- # TODO: install modules. -----------------------------------
- # Right now, there's no easy way to do that on the running machine
- # -----------------------------------------------------------------
- # make -C build/linux-$KVER ARCH=arm INSTALL_MOD_PATH=$outmnt modules_install
|