Switch to systemd-boot and Unified Kernel Image on Fedora

sudo mkdir /efi
sudo sed -i "s|/boot/efi|/efi|g" /etc/fstab

sudo umount /boot/efi
sudo mount /efi

sudo mkdir /efi/$(cat /etc/machine-id)
sudo rm /etc/dnf/protected.d/grub* /etc/dnf/protected.d/shim*   # needed in some cases, if next command won't run.
# in case following command fails, delete /etc/dnf/protected.d/grub* and /etc/dnf/protected.d/shim*
sudo dnf remove grubby grub2\* shim\* memtest86\ && sudo rm -rf /boot/grub2 && sudo rm -rf /boot/loader
cat /proc/cmdline | cut -d ' ' -f 2- | sudo tee /etc/kernel/cmdline
sudo bootctl install

sudo ln -s /dev/null /etc/kernel/install.d/50-dracut.install

#!/usr/bin/bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# systemd 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 Lesser General Public License
# along with systemd; If not, see <http://www.gnu.org/licenses/>.

COMMAND="$1"
KERNEL_VERSION="$2"
ENTRY_DIR_ABS="$3"
KERNEL_IMAGE="$4"
INITRD_OPTIONS_START="5"

MACHINE_ID=$KERNEL_INSTALL_MACHINE_ID

BOOT_ROOT=${ENTRY_DIR_ABS%/$MACHINE_ID/$KERNEL_VERSION}
BOOT_MNT=$(stat -c %m $BOOT_ROOT)
ENTRY_DIR=${ENTRY_DIR_ABS#$BOOT_MNT}

if [[ $COMMAND == remove ]]; then
    rm -f "$BOOT_ROOT/loader/entries/$MACHINE_ID-$KERNEL_VERSION.conf"
    rm -f "$BOOT_ROOT/loader/entries/$MACHINE_ID-$KERNEL_VERSION+"*".conf"
    rm -f "$BOOT_ROOT/EFI/Linux/$KERNEL_VERSION-$MACHINE_ID.efi"
    rm -f "$BOOT_ROOT/EFI/Linux/$KERNEL_VERSION-$MACHINE_ID+"*".efi"
    exit 0
fi

if ! [[ $COMMAND == add ]]; then
    exit 1
fi

if ! [[ $KERNEL_IMAGE ]]; then
    exit 1
fi

if [[ -f /etc/os-release ]]; then
    . /etc/os-release
elif [[ -f /usr/lib/os-release ]]; then
    . /usr/lib/os-release
fi

if ! [[ $PRETTY_NAME ]]; then
    PRETTY_NAME="Linux $KERNEL_VERSION"
fi

if [[ -f /etc/kernel/cmdline ]]; then
    read -r -d '' -a BOOT_OPTIONS < /etc/kernel/cmdline
elif [[ -f /usr/lib/kernel/cmdline ]]; then
    read -r -d '' -a BOOT_OPTIONS < /usr/lib/kernel/cmdline
else
    declare -a BOOT_OPTIONS

    read -r -d '' -a line < /proc/cmdline
    for i in "${line[@]}"; do
        [[ "${i#initrd=*}" != "$i" ]] && continue
        [[ "${i#BOOT_IMAGE=*}" != "$i" ]] && continue
        BOOT_OPTIONS+=("$i")
    done
fi

if [[ -f /etc/kernel/tries ]]; then
    read -r TRIES </etc/kernel/tries
    if ! [[ "$TRIES" =~ ^[0-9]+$ ]] ; then
        echo "/etc/kernel/tries does not contain an integer." >&2
        exit 1
    fi
    LOADER_ENTRY="$BOOT_ROOT/EFI/Linux/$KERNEL_VERSION-$MACHINE_ID+$TRIES.efi"
else
    LOADER_ENTRY="$BOOT_ROOT/EFI/Linux/$KERNEL_VERSION-$MACHINE_ID.efi"
fi

mkdir -p "${LOADER_ENTRY%/*}" || {
    echo "Could not create loader entry directory '${LOADER_ENTRY%/*}'." >&2
    exit 1
}

[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
    echo "Creating $LOADER_ENTRY"
{
unset noimageifnotneeded
for ((i=0; i < "${#BOOT_OPTIONS[@]}"; i++)); do
# shellcheck disable=SC1001
if [[ ${BOOT_OPTIONS[$i]} == root\=PARTUUID\=* ]]; then
noimageifnotneeded="yes"
break
fi
done
dracut --kernel-cmdline "${BOOT_OPTIONS[*]}" -f ${noimageifnotneeded:+--noimageifnotneeded} --uefi "$LOADER_ENTRY" "$KERNEL_VERSION"
}
exit 0

#!/usr/bin/bash

export LANG=C

COMMAND="$1"
KERNEL_VERSION="$2"
ENTRY_DIR_ABS="$3"
KERNEL_IMAGE="$4"


dropindirs_sort()
{
    suffix=$1; shift
    args=("$@")
    files=$(
        while (( $# > 0 )); do
            for i in "${1}"/*"${suffix}"; do
                [[ -f $i ]] && echo "${i##*/}"
            done
            shift
        done | sort -Vu
    )

    for f in $files; do
        for d in "${args[@]}"; do
            if [[ -f "$d/$f" ]]; then
                echo "$d/$f"
                continue 2
            fi
        done
    done
}

[[ -f /etc/os-release ]] && . /etc/os-release

if [[ ${KERNEL_INSTALL_MACHINE_ID+x} ]]; then
    MACHINE_ID=$KERNEL_INSTALL_MACHINE_ID
elif [[ -f /etc/machine-id ]] ; then
    read -r MACHINE_ID < /etc/machine-id
fi

if ! [[ $MACHINE_ID ]]; then
    exit 0
fi

if [[ -f /etc/kernel/cmdline ]]; then
    read -r -d '' -a BOOT_OPTIONS < /etc/kernel/cmdline
elif [[ -f /usr/lib/kernel/cmdline ]]; then
    read -r -d '' -a BOOT_OPTIONS < /usr/lib/kernel/cmdline
else
    declare -a BOOT_OPTIONS

    read -r -d '' -a line < /proc/cmdline
    for i in "${line[@]}"; do
        [[ "${i#initrd=*}" != "$i" ]] && continue
        BOOT_OPTIONS+=("$i")
    done
fi
BOOT_ROOT=${ENTRY_DIR_ABS%/$MACHINE_ID/$KERNEL_VERSION}
LOADER_ENTRY="$BOOT_ROOT/EFI/Linux/0-rescue-$MACHINE_ID.efi"
BOOT_DIR_ABS="$BOOT_ROOT/EFI/Linux"
ret=0

case "$COMMAND" in
    add)
        [[ -f "$LOADER_ENTRY" ]] && exit 0

        # source our config dir
        for f in $(dropindirs_sort ".conf" "/etc/dracut.conf.d" "/usr/lib/dracut/dracut.conf.d"); do
            if [[ -e $f ]]; then
                # shellcheck disable=SC1090
                . "$f"
            fi
        done

        # shellcheck disable=SC2154
        [[ $dracut_rescue_image != "yes" ]] && exit 0

        [[ -d "$BOOT_DIR_ABS" ]] || mkdir -p "$BOOT_DIR_ABS"

        dracut --kernel-cmdline "${BOOT_OPTIONS[*]}" -f --no-hostonly -a "rescue" --uefi "$LOADER_ENTRY" "$KERNEL_VERSION"

        ((ret+=$?))
        ;;

    remove)
        exit 0
        ;;

    *)
        usage
        ret=1;;
esac

exit $ret

sudo dnf install binutils # needed by dracut to build kernel image
sudo dnf reinstall $(rpm -qa|grep kernel-core)

python3-dnf-plugin-post-transaction-actions

systemd-udev:in:bootctl update