Add preliminary support for live kernel upgrade
Signed-off-by: Fil <fil.bergamo@riseup.net>
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Fil
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scripts/InstallScripts/FlashKernelPart.sh
Executable file
148
scripts/InstallScripts/FlashKernelPart.sh
Executable file
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#!/bin/sh -e
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# This file is part of PrawnOS (http://www.prawnos.com)
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# Copyright (c) 2018 Hal Emmerich <hal@halemmerich.com>
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# Copyright (c) 2020 Fil Bergamo <fil@filberg.eu>
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# PrawnOS is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2
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# as published by the Free Software Foundation.
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# PrawnOS is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with PrawnOS. If not, see <https://www.gnu.org/licenses/>.
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# -----------------------------------------------
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# STATIC CONFIGURATION
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# -----------------------------------------------
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#
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# eMMC device name
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emmc_devname=mmcblk2
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#
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# Blank kernel image
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blnk=./blank_kernel
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#
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# Actual kernel image (.kpart)
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kimg=./vmlinux.kpart
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#
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# GPT partition type UUID for "ChromeOS kernel"
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ptype_kernel="FE3A2A5D-4F32-41A7-B725-ACCC3285A309"
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#
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# Kernel partition number
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pnum_kernel=1
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# -----------------------------------------------
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# function die():
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# print an error message and exit with the provided code
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# $1 = error message
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# $2 = exit code
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die()
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{
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redtxt='\033[0;31m'
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printf "$redtxt$1\n"
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exit $2
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}
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# function get_partition_type_uuid()
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# print the UUID of the gpt partition type
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# for the given partition number on the given device
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# $1 = device (e.g. /dev/mmcblk2)
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# $2 = partition number
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get_partition_type_uuid()
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{
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cgpt show -i "$2" -t -n -q "$1" 2>/dev/null
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}
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# function get_root_partition()
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# print the actual physical device
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# currently mounted as "/"
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get_root_partition()
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{
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rootfs=$(findmnt / -n -o SOURCE)
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if echo "$rootfs" | grep -q "/dev/mapper" ;then
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# root filesystem is on luks volume
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# let's find the physical device behind it
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rootfs=$(cryptsetup status "$rootfs" | grep "device: " | cut -d ' ' -f 5)
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fi
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echo "$rootfs"
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}
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# ------------- BEGIN SCRIPT EXECUTION --------------------
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# Check root or sudo
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[ ! $(id -u) = 0 ] &&
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die "Please run this script with sudo, or as root" 1
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rootfs=$(get_root_partition)
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devname=$(lsblk -no pkname $rootfs | head -n 1)
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devtype=
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kpart=
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case "$devname" in
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$emmc_devname)
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devtype="Internal eMMC"
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kpart=/dev/${devname}p$pnum_kernel
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;;
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sd*)
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devtype="USB Stick"
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kpart=/dev/${devname}$pnum_kernel
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;;
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mmcblk[0-9])
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devtype="External SD card"
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kpart=/dev/${devname}p$pnum_kernel
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;;
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*)
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die "FAILED to recognize booted device type $devname" 127
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esac
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# Check that the selected partition is effectively of type "kernel"
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ptype=$(get_partition_type_uuid /dev/$devname $pnum_kernel)
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[ ! "$ptype" = "$ptype_kernel" ] &&
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die "FATAL ERROR: unexpected partitioning scheme found. Partition # $pnum_kernel is NOT the kernel partition!" 255
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# Check that the needed kernel images exist
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[ ! -e "$kimg" ] &&
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die "ERROR: cannot find kernel image at $kimg !" 127
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[ ! -e "$blnk" ] &&
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die "ERROR: cannot find blank image at $blnk !" 127
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# Prompt for user's confirmation
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echo "
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----------------------------
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/!\\ !!! CAUTION !!! /!\\
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----------------------------
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This will flash a new kernel image onto the running device's kernel partition: $kpart
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The detected running device is: $devtype.
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DO NOT shutdown or reboot before completing the process!
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"
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printf "%s" "Are you REALLY sure you want to continue??? [y/N] "
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read ans
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[ "$ans" != "y" ] &&
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[ "$ans" != "Y" ] &&
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die "Aborted by user. Kernel untouched." 1
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# put the kernel in the kernel partition
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dd if="$blnk" of="$kpart" conv=notrunc ||
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die "FAILED to flash blank kernel on $kpart!" 255
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dd if="$kimg" of="$kpart" conv=notrunc ||
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die "FAILED to flash kernel image on $kpart!" 255
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echo "
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The new kernel image has been successfully flashed onto $kpart.
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It's now safe to reboot."
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# TODO: install modules. -----------------------------------
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# Right now, there's no easy way to do that on the running machine
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# -----------------------------------------------------------------
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# make -C build/linux-$KVER ARCH=arm INSTALL_MOD_PATH=$outmnt modules_install
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