update_kernel_15.0

#!/bin/bash

# Copyright 2021 Matt Dinslage (daedra1980@gmail.com), Springfield, MO, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

set -e

# Run as root only
if [ "$EUID" -ne 0 ] ; then
  echo "Please run as root"
  exit
fi

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

if [ "$ARCH" = "i586" ]; then
  ARCHSUFFIX=""
  SMP="-smp"
elif [ "$ARCH" = "i686" ]; then
  ARCHSUFFIX=""
  SMP="-smp"
elif [ "$ARCH" = "x86_64" ]; then
  ARCHSUFFIX="64"
  SMP=""
fi

CHANGELOG="https://slackware.osuosl.org/slackware${ARCHSUFFIX}-15.0/ChangeLog.txt"
OLD_KERNEL=$(find /var/lib/pkgtools/packages/ -iname "*kernel-source*" | tail -n1 | cut -d/ -f6 | cut -c15-21)
NEW_KERNEL=$(wget -O- -q "$CHANGELOG" | grep linux-5.15 | head -n1 | cut -d/ -f3 | cut -d- -f2)
PATCHES="https://slackware.osuosl.org/slackware${ARCHSUFFIX}-15.0/patches/packages"
MD5SUM="https://slackware.osuosl.org/slackware${ARCHSUFFIX}-15.0/patches/CHECKSUMS.md5"

if [ "$OLD_KERNEL" = "$NEW_KERNEL" ] ; then
  echo "Latest kernel already installed"
  exit 1
fi

# create temporary directories
TMP=${TMP:-/tmp/linux-$NEW_KERNEL${SMP}}
rm -rf "$TMP"
mkdir "$TMP"
cd "$TMP"

echo ""
echo -e "\e[1;32m ###          \e[0m"
echo -e "\e[1;32m ### Kernel update available, downloading new kernel packages... \e[0m"
echo -e "\e[1;32m ###          \e[0m"
echo ""
sleep 1

# grab new kernel packages
wget -r -np -nd -l1 --accept=*.t?z "$PATCHES"/linux-"$NEW_KERNEL"

echo ""
echo -e "\e[1;32m ###          \e[0m"
echo -e "\e[1;32m ### Verify Checksums\e[0m"
echo -e "\e[1;32m ###          \e[0m"
echo ""
sleep 1

# check md5sum of packages 
for k in *.t?z ; do
  if [ "$(wget -O- -q "$MD5SUM" | grep "$k" | head -n1 | cut -d" " -f1)" == "$(md5sum "$k" | cut -d" " -f1)" ] ; then
	echo -e "$k md5sum... \e[1;32m verified\e[0m"
  else
	echo -e "$k md5sum mismatch... \e[1;31m aborting\e[0m" 
	exit 1
  fi
done

echo ""
echo -e "\e[1;32m ###          \e[0m"
echo -e "\e[1;32m ### Upgrade kernel packages but don't replace original modules package\e[0m"
echo -e "\e[1;32m ###          \e[0m"
echo ""
sleep 1 

# remove old kernel modules except the 5.15.19 modules that shipped with 15.0
if [ "$OLD_KERNEL" != 5.15.19 ] ; then
    find /var/lib/pkgtools/packages/ -type f -iname "*kernel-modules*$OLD_KERNEL*" -exec removepkg {} \;
fi

# install new kernel-modules
find ./* -iname "*modules*" -exec installpkg {} \;

# upgrade the kernel
find ./* ! -iname "*modules*" -exec upgradepkg --reinstall --install-new {} \;

# Create new initramfs
if [ -f /etc/mkinitrd.conf ] ; then
  echo -e "\e[1;32m ### /etc/mkinitrd.conf found... use that \e[0m"
  mkinitrd -F
else
  echo -e "\e[1;32m ### /etc/mkinitrd.conf not found... use /usr/share/mkinitrd_command_generator.sh \e[0m"
  sh /usr/share/mkinitrd/mkinitrd_command_generator.sh -r -k "${NEW_KERNEL}""${SMP}" | bash
fi

# update grub or lilo
if [ -f /etc/lilo.conf ] ; then
  echo -e "\e[1;36m ### LILO Found, using that...\e[0m"
  lilo -v
elif [ -f /boot/grub/grub.cfg ] ; then
  echo -e "\e[1;36m ### Grub Found, using that...\e[0m"
  grub-mkconfig -o /boot/grub/grub.cfg
else
  echo "LILO or Grub not found!"
  echo "Assuming ELILO or rEFInd, if ELILO, then run eliloconfig or manually update your bootloader before rebooting!"
fi

echo ""
echo -e "\e[1;32m ###          \e[0m"
echo -e "\e[1;32m ### Kernel upgrade finished \e[0m"
echo -e "\e[1;32m ###          \e[0m"