systemd-boot

zz-update-systemd-boot

#!/bin/bash
#
# This is a simple kernel hook to populate the systemd-boot entries
# whenever kernels are added or removed.
#/etc/kernel/postinst.d/zz-update-systemd-boot

# The UUID of your disk.
# Note: if using LVM, this should be the LVM partition.
UUID="18401d69-3d12-47f2-98dc-e236ebb454f1"

# The LUKS volume slug you want to use, which will result in the
# partition being mounted to /dev/mapper/CHANGEME.
# VOLUME="CHANGEME"

# Any rootflags you wish to set. For example, mine are currently
# "subvol=@ quiet splash intel_pstate=enable".
ROOTFLAGS="quiet apparmor=1 security=apparmor loglevel=3  mitigations=off udev.log_priority=3 resume=UUID=a37d3f86-6da8-416b-b831-6e2e50378228"
ROOTFLAGS1="quiet apparmor=1 security=apparmor loglevel=3  mitigations=off udev.log_priority=3 resume=UUID=a37d3f86-6da8-416b-b831-6e2e50378228 3"

# Our kernels.
KERNELS=()
FIND="find /boot -maxdepth 1 -name 'vmlinuz-*' -type f -not -name '*.dpkg-tmp' -print0 | sort -Vrz"
while IFS= read -r -u3 -d $'\0' LINE; do
	KERNEL=$(basename "${LINE}")
	KERNELS+=("${KERNEL:8}")
done 3< <(eval "${FIND}")

# There has to be at least one kernel.
if [ ${#KERNELS[@]} -lt 1 ]; then
	echo -e "\e[2msystemd-boot\e[0m \e[1;31mNo kernels found.\e[0m"
	exit 1
fi

# Perform a nuclear clean to ensure everything is always in
# perfect sync.
rm /boot/efi/loader/entries/*.conf
rm -rf /boot/efi/ubuntu
mkdir /boot/efi/ubuntu

# Copy the latest kernel files to a consistent place so we can
# keep using the same loader configuration.
LATEST="${KERNELS[@]:0:1}"
echo -e "\e[2msystemd-boot\e[0m \e[1;32m${LATEST}\e[0m"
for FILE in config initrd.img System.map vmlinuz; do
    cp "/boot/${FILE}-${LATEST}" "/boot/efi/ubuntu/${FILE}"
    cat << EOF > /boot/efi/loader/entries/plasma.conf
title   Plasma OS
linux   /ubuntu/vmlinuz
initrd  /ubuntu/initrd.img
options root=UUID=${UUID} ro ${ROOTFLAGS}
EOF
done

for FILE in config initrd.img System.map vmlinuz; do
    cp "/boot/${FILE}-${LATEST}" "/boot/efi/ubuntu/${FILE}"
    cat << EOF > /boot/efi/loader/entries/recover.conf
title   Recovery Console
linux   /ubuntu/vmlinuz
initrd  /ubuntu/initrd.img
options root=UUID=${UUID} ro ${ROOTFLAGS1}
EOF
done

if [ ${#KERNELS[@]} -gt 1 ]; then
	LEGACY=("${KERNELS[@]:1}")
	for VERSION in "${LEGACY[@]}"; do
	    echo -e "\e[2msystemd-boot\e[0m \e[1;32m${VERSION}\e[0m"
	    for FILE in config initrd.img System.map vmlinuz; do
	        cp "/boot/${FILE}-${VERSION}" "/boot/efi/ubuntu/${FILE}-${VERSION}"
	        cat << EOF > /boot/efi/loader/entries/kubuntu-${VERSION}.conf
title   Kubuntu ${VERSION}
linux   /ubuntu/vmlinuz-${VERSION}
initrd  /ubuntu/initrd.img-${VERSION}
options root=UUID=${UUID} ro ${ROOTFLAGS}
EOF
	    done
	done
fi

# Success!
echo -e "\e[2m---\e[0m"
exit 0