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181 lines
7.7 KiB
Text
181 lines
7.7 KiB
Text
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#!/bin/bash
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# Copyright 2024 Patrick J. Volkerding, Sebeka, Minnesota, USA
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# All rights reserved.
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#
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# Redistribution and use of this script, with or without modification, is
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# permitted provided that the following conditions are met:
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#
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# 1. Redistributions of this script must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# This script creates a virtual installed package named
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# kernel-backup-${KERNEL_VERSION}-${ARCH}-${BUILD}, which
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# consists of a backup of /boot/vmlinuz-${KERNEL_VERSION}-generic
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# to /boot/vmlinuz-${KERNEL_VERSION}-backup, and the modules that
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# go with this kernel. If there's a matching initrd already created,
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# we'll include that too. Otherwise, we'll assume you don't want one
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# or that you'll manage it yourself outside of the installed backup
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# package.
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#
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# By default, it makes a backup of the kernel pointed to by
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# /boot/vmlinuz-generic. Once backed up, this kernel can be added to
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# your bootloader as a fallback kernel, and removing or upgrading the
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# original kernel-generic package will not remove it. But, you can
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# remove the kernel-backup package later with removepkg if you wish.
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#
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# The $KERNEL_FILE doesn't need to have any particular naming scheme.
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# You could point at /usr/src/linux/arch/x86/boot/bzImage for all this
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# script cares. The kernel modules do need to be installed first though.
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BUILD=${BUILD:-1}
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# This is the kernel to use (may be a symlink):
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KERNEL_FILE=${KERNEL_FILE:-/boot/vmlinuz-generic}
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# This is the kernel name for the backup kernel:
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BACKUP_NAME=${BACKUP_NAME:-backup}
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# If this is a symlink, find the actual file:
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if [ -L $KERNEL_FILE ]; then
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KERNEL_FILE=$(readlink -f $KERNEL_FILE)
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fi
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# Find the kernel version:
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if [ -r $KERNEL_FILE ]; then
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KERNEL_VERSION=$(strings $KERNEL_FILE | grep '([^ ]*@[^ ]*) #' | cut -f1 -d' ')
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else
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echo "ERROR: $KERNEL_FILE not found."
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exit 1
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fi
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# We require the modules for this kernel version to be installed:
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if [ ! -d /lib/modules/${KERNEL_VERSION} ]; then
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echo "ERROR: directory /lib/modules/${KERNEL_VERSION} does not exist."
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echo "Refusing to back up a kernel without modules."
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exit 1
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fi
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# Guess the $ARCH:
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if file /bin/bash | grep -wq x86-64 ; then
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ARCH="x86_64"
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elif file /bin/bash | grep -wq 80386 ; then
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ARCH="i686"
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else
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ARCH="$(uname -m)"
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fi
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# Make a backup of the kernel in /boot:
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rm -f /boot/vmlinuz-${KERNEL_VERSION}-${BACKUP_NAME}
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cp -a $KERNEL_FILE /boot/vmlinuz-${KERNEL_VERSION}-${BACKUP_NAME}
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# Make an unversioned symlink:
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rm -f /boot/vmlinuz-${BACKUP_NAME}
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ln -sf vmlinuz-${KERNEL_VERSION}-${BACKUP_NAME} /boot/vmlinuz-${BACKUP_NAME}
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# If there is an initrd for this kernel version, we will assume that's
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# the one we should use:
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if /bin/ls /boot/initrd-${KERNEL_VERSION}-*.img 1> /dev/null 2> /dev/null ; then
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# Pick the newest one:
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cp -a $(/bin/ls -t /boot/initrd-${KERNEL_VERSION}-*.img | grep -v /boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img | head -n 1) /boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img
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INITBLURB="Backed up $(/bin/ls -t /boot/initrd-${KERNEL_VERSION}-*.img | grep -v /boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img | head -n 1) as /boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img."
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else
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INITBLURB="Not including an initrd because a matching version was not found."
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fi
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# OK, an initrd could be made automatically if you don't have one, but that's
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# not really this script's job. ;-) If you don't already have one, we will
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# assume that's because you don't use one, and don't want one.
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#else
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# # Make an initrd for this:
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# sh /usr/share/mkinitrd/mkinitrd_command_generator.sh -k ${KERNEL_VERSION} -a "-L -o /boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img" | bash 1> /dev/null 2> /dev/null
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#fi
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# Make an initrd symlink if we backed up an initrd:
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if [ -f /boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img ]; then
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rm -f /boot/initrd-${BACKUP_NAME}.img
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ln -sf initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img /boot/initrd-${BACKUP_NAME}.img
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fi
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# Some shortcuts to avoid redundancy:
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PACKAGE_NAME="kernel-${BACKUP_NAME}-${KERNEL_VERSION}-${ARCH}-${BUILD}"
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PACKAGES_ENTRY=/var/lib/pkgtools/packages/${PACKAGE_NAME}
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SCRIPTS_ENTRY=/var/lib/pkgtools/scripts/${PACKAGE_NAME}
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# Now we need to make a "virtual" package. We'll start with the "pkgtools/packages/" entry:
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cat << EOF > $PACKAGES_ENTRY
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PACKAGE NAME: ${PACKAGE_NAME}
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COMPRESSED PACKAGE SIZE: 93M
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UNCOMPRESSED PACKAGE SIZE: 444M
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PACKAGE LOCATION: ./${PACKAGE_NAME}
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PACKAGE DESCRIPTION:
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kernel-${BACKUP_NAME}: kernel-${BACKUP_NAME} (backup of ${KERNEL_FILE})
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kernel-${BACKUP_NAME}:
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kernel-${BACKUP_NAME}: This is a Linux kernel with built-in support for SATA, NVMe, and most
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kernel-${BACKUP_NAME}: commonly used filesystems, as well as a large collection of loadable
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kernel-${BACKUP_NAME}: kernel modules.
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kernel-${BACKUP_NAME}:
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kernel-${BACKUP_NAME}: It is recommended to use an initrd with this kernel for best results.
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kernel-${BACKUP_NAME}: For more information about creating an initrd, see the README.initrd
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kernel-${BACKUP_NAME}: file in the /boot directory.
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kernel-${BACKUP_NAME}:
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kernel-${BACKUP_NAME}:
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FILE LIST:
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./
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boot/
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EOF
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echo boot/vmlinuz-${KERNEL_VERSION}-${BACKUP_NAME} >> $PACKAGES_ENTRY
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if [ -f /boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img ]; then
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echo boot/initrd-${KERNEL_VERSION}-${BACKUP_NAME}.img >> $PACKAGES_ENTRY
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fi
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echo "lib/" >> $PACKAGES_ENTRY
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echo "lib/modules/" >> $PACKAGES_ENTRY
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# First the files:
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find /lib/modules/${KERNEL_VERSION} -type f | cut -b2- > ${PACKAGES_ENTRY}-tmp
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# Then the directories:
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find /lib/modules/${KERNEL_VERSION} -type d | cut -b2- | sed "s|$|/|" >> ${PACKAGES_ENTRY}-tmp
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cat ${PACKAGES_ENTRY}-tmp | sort >> $PACKAGES_ENTRY
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rm -f ${PACKAGES_ENTRY}-tmp
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# Finally, store the symlinks in the "pkgtools/scripts/" entry:
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make_install_script() {
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TAB="$(echo -e "\t")"
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COUNT=1
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while :; do
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LINE="$(sed -n "$COUNT p" $1)"
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if [ "$LINE" = "" ]; then
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break
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fi
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LINKGOESIN="$(echo "$LINE" | cut -f 1 -d "$TAB")"
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LINKGOESIN="$(dirname "$LINKGOESIN")"
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LINKNAMEIS="$(echo "$LINE" | cut -f 1 -d "$TAB")"
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LINKNAMEIS="$(basename "$LINKNAMEIS")"
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LINKPOINTSTO="$(echo "$LINE" | cut -f 2 -d "$TAB")"
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echo "( cd $LINKGOESIN ; rm -rf $LINKNAMEIS )"
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echo "( cd $LINKGOESIN ; ln -sf $LINKPOINTSTO $LINKNAMEIS )"
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COUNT=$(expr $COUNT + 1)
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done
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}
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rm -f ${SCRIPTS_ENTRY}
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find /boot -name vmlinuz-${BACKUP_NAME} -printf "%p\t%l\n" | cut -b2- | LC_COLLATE=C sort | sed 's,^\./,,; s,[ "#$&\x27()*;<>?[\\`{|~],\\&,g;' | make_install_script >> ${SCRIPTS_ENTRY}
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find /boot -name initrd-${BACKUP_NAME}.img -printf "%p\t%l\n" | cut -b2- | LC_COLLATE=C sort | sed 's,^\./,,; s,[ "#$&\x27()*;<>?[\\`{|~],\\&,g;' | make_install_script >> ${SCRIPTS_ENTRY}
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find /lib/modules/${KERNEL_VERSION} -type l -printf "%p\t%l\n" | cut -b2- | LC_COLLATE=C sort | sed 's,^\./,,; s,[ "#$&\x27()*;<>?[\\`{|~],\\&,g;' | make_install_script >> ${SCRIPTS_ENTRY}
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echo "Backed up ${KERNEL_FILE} as /boot/vmlinuz-${KERNEL_VERSION}-${BACKUP_NAME}."
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echo "Backed up kernel modules in /lib/modules/${KERNEL_VERSION}/"
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if [ ! -z "$INITBLURB" ]; then
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echo $INITBLURB
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fi
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echo "Installed as package ${PACKAGE_NAME}."
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