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systemd/src/kernel-install/kernel-install.in

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#!/bin/sh
# -*- 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/>.
skip_remaining=77
usage()
{
echo "Usage:"
echo " kernel-install [OPTIONS...] add KERNEL-VERSION KERNEL-IMAGE [INITRD-FILE...]"
echo " kernel-install [OPTIONS...] remove KERNEL-VERSION"
echo " kernel-install [OPTIONS...] inspect"
echo "Options:"
echo " -h, --help Print this help and exit"
echo " --version Print version string and exit"
echo " -v, --verbose Increase verbosity"
}
dropindirs_sort()
{
suffix="$1"
shift
for d; do
for i in "$d/"*"$suffix"; do
[ -e "$i" ] && echo "${i##*/}"
done
done | sort -Vu | while read -r f; do
for d; do
if [ -e "$d/$f" ]; then
[ -x "$d/$f" ] && echo "$d/$f"
continue 2
fi
done
done
}
export LC_COLLATE=C
for i; do
if [ "$i" = "--help" ] || [ "$i" = "-h" ]; then
usage
exit 0
fi
done
for i; do
if [ "$i" = "--version" ]; then
echo "kernel-install {{PROJECT_VERSION}} ({{GIT_VERSION}})"
exit 0
fi
done
if [ "$KERNEL_INSTALL_BYPASS" = "1" ]; then
echo "kernel-install: Skipping execution because KERNEL_INSTALL_BYPASS=1"
exit 0
fi
export KERNEL_INSTALL_VERBOSE=0
if [ "$1" = "--verbose" ] || [ "$1" = "-v" ]; then
shift
export KERNEL_INSTALL_VERBOSE=1
fi
if [ "${0##*/}" = "installkernel" ]; then
COMMAND=add
# kernel's install.sh invokes us as
# /sbin/installkernel <version> <vmlinuz> <map> <installation-dir>
# We ignore the last two arguments.
set -- "$1"
else
COMMAND="$1"
[ $# -ge 1 ] && shift
fi
if [ "$COMMAND" = "inspect" ]; then
KERNEL_VERSION=""
else
if [ $# -lt 1 ]; then
echo "Error: not enough arguments" >&2
exit 1
fi
KERNEL_VERSION="$1"
shift
fi
# These two settings are settable in install.conf
layout=
initrd_generator=
if [ -r "/etc/kernel/install.conf" ]; then
install_conf="/etc/kernel/install.conf"
elif [ -r "/usr/lib/kernel/install.conf" ]; then
install_conf="/usr/lib/kernel/install.conf"
else
install_conf=
fi
if [ -n "$install_conf" ]; then
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "Reading $install_conf…"
# shellcheck source=/dev/null
. "$install_conf"
# FIXME: This may override configuration in environment variables, e.g. $BOOT_ROOT.
fi
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && [ -n "$layout" ] && \
echo "$install_conf configures layout=$layout"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && [ -n "$initrd_generator" ] && \
echo "$install_conf configures initrd_generator=$initrd_generator"
[ -n "$MACHINE_ID" ] && [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "machine-id $MACHINE_ID set via environment or install.conf"
[ -n "$BOOT_ROOT" ] && [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "BOOT_ROOT=$BOOT_ROOT set via environment or install.conf"
# If /etc/machine-id is initialized we'll use it, otherwise we'll use a freshly
# generated one. If the user configured an explicit machine ID to use in
# /etc/machine-info to use for our purpose, we'll use that instead (for
# compatibility).
# shellcheck source=/dev/null
if [ -z "$MACHINE_ID" ] && [ -r /etc/machine-info ] && . /etc/machine-info && MACHINE_ID="$KERNEL_INSTALL_MACHINE_ID"; then
[ -n "$MACHINE_ID" ] && [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "machine-id $MACHINE_ID acquired from /etc/machine-info"
fi
if [ -z "$MACHINE_ID" ] && [ -r /etc/machine-id ] && read -r MACHINE_ID </etc/machine-id; then
[ -n "$MACHINE_ID" ] && [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "machine-id $MACHINE_ID acquired from /etc/machine-id"
fi
if [ -z "$MACHINE_ID" ]; then
MACHINE_ID="$(systemd-id128 new)" || exit 1
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "new machine-id $MACHINE_ID generated"
fi
# Now that we determined the machine ID to use, let's determine the "token" for
# the boot loader entry to generate. We use that for naming the directory below
# $BOOT where we want to place the kernel/initrd and related resources, as well
# for naming the .conf boot loader spec entry. Typically this is just the
# machine ID, but it can be anything else, too, if we are told so.
if [ -z "$ENTRY_TOKEN" ] && [ -r /etc/kernel/entry-token ] && read -r ENTRY_TOKEN </etc/kernel/entry-token; then
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "entry-token \"$ENTRY_TOKEN\" acquired from /etc/kernel/entry-token"
fi
if [ -z "$ENTRY_TOKEN" ]; then
# If not configured explicitly, then use a few candidates: the machine ID,
# the IMAGE_ID= and ID= fields from /etc/os-release and finally the fixed
# string "Default"
ENTRY_TOKEN_SEARCH="$MACHINE_ID"
# shellcheck source=/dev/null
[ -r /etc/os-release ] && . /etc/os-release
[ -n "$IMAGE_ID" ] && ENTRY_TOKEN_SEARCH="$ENTRY_TOKEN_SEARCH $IMAGE_ID"
[ -n "$ID" ] && ENTRY_TOKEN_SEARCH="$ENTRY_TOKEN_SEARCH $ID"
ENTRY_TOKEN_SEARCH="$ENTRY_TOKEN_SEARCH Default"
else
ENTRY_TOKEN_SEARCH="$ENTRY_TOKEN"
fi
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "Entry-token candidates: $ENTRY_TOKEN_SEARCH"
# NB: The $MACHINE_ID is guaranteed to be a valid machine ID, but
# $ENTRY_TOKEN can be any string that fits into a VFAT filename, though
# typically is just the machine ID.
if [ -n "$BOOT_ROOT" ]; then
# If this was already configured, don't try to guess
BOOT_ROOT_SEARCH="$BOOT_ROOT"
else
BOOT_ROOT_SEARCH="/efi /boot /boot/efi"
fi
for pref in $BOOT_ROOT_SEARCH; do
for suff in $ENTRY_TOKEN_SEARCH; do
if [ -d "$pref/$suff" ]; then
[ -z "$BOOT_ROOT" ] && BOOT_ROOT="$pref"
[ -z "$ENTRY_TOKEN" ] && ENTRY_TOKEN="$suff"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "$pref/$suff exists, using BOOT_ROOT=$BOOT_ROOT, ENTRY_TOKEN=$ENTRY_TOKEN"
break 2
else
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "$pref/$suff not found…"
fi
if [ -d "$pref/loader/entries" ]; then
[ -z "$BOOT_ROOT" ] && BOOT_ROOT="$pref"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "$pref/loader/entries exists, using BOOT_ROOT=$BOOT_ROOT"
break 2
else
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "$pref/loader/entries not found…"
fi
done
done
[ -z "$BOOT_ROOT" ] && for pref in "/efi" "/boot/efi"; do
if mountpoint -q "$pref"; then
BOOT_ROOT="$pref"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "$pref is a mount point, using BOOT_ROOT=$BOOT_ROOT"
break
else
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "$pref is not a mount point…"
fi
done
if [ -z "$BOOT_ROOT" ]; then
BOOT_ROOT="/boot"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "KERNEL_INSTALL_BOOT_ROOT autodection yielded no candidates, using \"$BOOT_ROOT\""
fi
if [ -z "$ENTRY_TOKEN" ]; then
ENTRY_TOKEN="$MACHINE_ID"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "No entry-token candidate matched, using \"$ENTRY_TOKEN\" from machine-id"
fi
if [ -z "$layout" ]; then
# No layout configured by the administrator. Let's try to figure it out
# automatically from metadata already contained in $BOOT_ROOT.
if [ -e "$BOOT_ROOT/loader/entries.srel" ]; then
read -r ENTRIES_SREL <"$BOOT_ROOT/loader/entries.srel"
if [ "$ENTRIES_SREL" = "type1" ]; then
# The loader/entries.srel file clearly indicates that the installed
# boot loader implements the proper standard upstream boot loader
# spec for Type #1 entries. Let's default to that, then.
layout="bls"
else
# The loader/entries.srel file indicates some other spec is
# implemented and owns the /loader/entries/ directory. Since we
# have no idea what that means, let's stay away from it by default.
layout="other"
fi
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && \
echo "$BOOT_ROOT/loader/entries.srel with '$ENTRIES_SREL' found, using layout=$layout"
elif [ -d "$BOOT_ROOT/$ENTRY_TOKEN" ]; then
# If the metadata in $BOOT_ROOT doesn't tell us anything, then check if
# the entry token directory already exists. If so, let's assume it's
# the standard boot loader spec, too.
layout="bls"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "$BOOT_ROOT/$ENTRY_TOKEN exists, using layout=$layout"
else
# There's no metadata in $BOOT_ROOT, and apparently no entry token
# directory installed? Then we really don't know anything.
layout="other"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "Entry-token directory not found, using layout=$layout"
fi
fi
ENTRY_DIR_ABS="$BOOT_ROOT/$ENTRY_TOKEN/$KERNEL_VERSION"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "Using ENTRY_DIR_ABS=$ENTRY_DIR_ABS"
# Provide a directory where to store generated initrds
cleanup() {
[ -n "$KERNEL_INSTALL_STAGING_AREA" ] && rm -rf "$KERNEL_INSTALL_STAGING_AREA"
}
trap cleanup EXIT
KERNEL_INSTALL_STAGING_AREA="$(mktemp -d -t kernel-install.staging.XXXXXXX)"
export KERNEL_INSTALL_MACHINE_ID="$MACHINE_ID"
export KERNEL_INSTALL_ENTRY_TOKEN="$ENTRY_TOKEN"
export KERNEL_INSTALL_BOOT_ROOT="$BOOT_ROOT"
export KERNEL_INSTALL_LAYOUT="$layout"
export KERNEL_INSTALL_INITRD_GENERATOR="$initrd_generator"
export KERNEL_INSTALL_STAGING_AREA
[ "$layout" = "bls" ]
MAKE_ENTRY_DIR_ABS=$?
ret=0
PLUGINS="$(
dropindirs_sort ".install" \
"/etc/kernel/install.d" \
"/usr/lib/kernel/install.d"
)"
IFS="
"
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && printf '%s\n' "Plugin files:" "$PLUGINS"
case "$COMMAND" in
add)
if [ $# -lt 1 ]; then
echo "Error: command 'add' requires a kernel image" >&2
exit 1
fi
if ! [ -f "$1" ]; then
echo "Error: kernel image argument $1 not a file" >&2
exit 1
fi
if [ "$MAKE_ENTRY_DIR_ABS" -eq 0 ]; then
# Compatibility with earlier versions that used the presence of $BOOT_ROOT/$ENTRY_TOKEN
# to signal to 00-entry-directory to create $ENTRY_DIR_ABS
# to serve as the indication to use or to not use the BLS
if [ "$KERNEL_INSTALL_VERBOSE" -gt 0 ]; then
echo "+mkdir -v -p $ENTRY_DIR_ABS"
mkdir -v -p "$ENTRY_DIR_ABS" || exit 1
else
mkdir -p "$ENTRY_DIR_ABS" || exit 1
fi
fi
for f in $PLUGINS; do
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "+$f add $KERNEL_VERSION $ENTRY_DIR_ABS" "$@"
"$f" add "$KERNEL_VERSION" "$ENTRY_DIR_ABS" "$@"
err=$?
[ $err -eq $skip_remaining ] && break
ret=$(( ret + err ))
done
;;
remove)
for f in $PLUGINS; do
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "+$f remove $KERNEL_VERSION $ENTRY_DIR_ABS"
"$f" remove "$KERNEL_VERSION" "$ENTRY_DIR_ABS"
err=$?
[ $err -eq $skip_remaining ] && break
ret=$(( ret + err ))
done
if [ "$MAKE_ENTRY_DIR_ABS" -eq 0 ]; then
[ "$KERNEL_INSTALL_VERBOSE" -gt 0 ] && echo "Removing $ENTRY_DIR_ABS/"
rm -rf "$ENTRY_DIR_ABS"
fi
;;
inspect)
echo "KERNEL_INSTALL_MACHINE_ID: $KERNEL_INSTALL_MACHINE_ID"
echo "KERNEL_INSTALL_ENTRY_TOKEN: $KERNEL_INSTALL_ENTRY_TOKEN"
echo "KERNEL_INSTALL_BOOT_ROOT: $KERNEL_INSTALL_BOOT_ROOT"
echo "KERNEL_INSTALL_LAYOUT: $KERNEL_INSTALL_LAYOUT"
echo "KERNEL_INSTALL_INITRD_GENERATOR: $KERNEL_INSTALL_INITRD_GENERATOR"
echo "ENTRY_DIR_ABS: $KERNEL_INSTALL_BOOT_ROOT/$ENTRY_TOKEN/\$KERNEL_VERSION"
# Assert that ENTRY_DIR_ABS actually matches what we are printing here
[ "${ENTRY_DIR_ABS%/*}" = "$KERNEL_INSTALL_BOOT_ROOT/$ENTRY_TOKEN" ] || { echo "Assertion didn't pass." >&2; exit 1; }
;;
*)
echo "Error: unknown command '$COMMAND'" >&2
exit 1
;;
esac
exit "$ret"
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