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#!/bin/sh
# Helper to add, modify, and remove a kernel command line option. This supports
# grub and zipl, i. e. x86, arm64, and s390x. Either grubby (Fedora, RHEL) or
# update-grub (Debian, Ubuntu) needs to be available.
#
# Copyright (C) 2019 Red Hat, Inc
set -eu
error() {
echo "$1" >&2
exit 1
}
grub() {
key="${2%=*}" # split off optional =value
# For the non-BLS case, or if someone overrides those with grub2-mkconfig
# or update-grub, change it in /etc/default/grub
if [ -e /etc/default/grub ]; then
if [ "$1" = set ]; then
# replace existing argument, otherwise append it
sed -i.bak -r "/^[[:space:]]*GRUB_CMDLINE_LINUX\b/ { s/$key(=[^[:space:]\"]*)?/$2/g; t; s/\"$/ $2\"/ }" /etc/default/grub
else
sed -i.bak -r "/^[[:space:]]*GRUB_CMDLINE_LINUX\b/ s/$key(=[^[:space:]\"]*)?//g" /etc/default/grub
fi
fi
# on Fedora and RHEL, use grubby; this covers grub and BLS; s390x's zipl also supports BLS there
if type grubby >/dev/null 2>&1; then
if [ "$1" = set ]; then
grubby --args="$2" --update-kernel=ALL
else
grubby --remove-args="$2" --update-kernel=ALL
fi
# on Debian/Ubuntu, use update-grub, which reads from /etc/default/grub
elif [ -e /etc/default/grub ] && type update-grub >/dev/null 2>&1; then
update-grub
# on OSTree, the kernel config is inside the image
elif cur=$(rpm-ostree kargs 2>&1); then
if [ "$1" = set ]; then
# replace if already present; can happen in the middle (must be separated by space) or at the beginning of line
if [ "${cur% $key *}" != "$cur" ] || [ "${cur% $key=*}" != "$cur" ] || [ "${cur#${key}[ =]}" != "$cur" ]; then
rpm-ostree kargs --replace="$2"
else
rpm-ostree kargs --append="$2"
fi
else
rpm-ostree kargs --delete="$key"
fi
else
error "No supported grub update mechanism found (grubby, update-grub, or rpm-ostree)"
fi
}
update_zipl() {
if type zipl >/dev/null 2>&1; then
zipl
fi
}
#
# main
#
if [ -z "${2:-}" ] || [ -n "${3:-}" ] || [ "$1" != "set" -a "$1" != "remove" ]; then
error "Usage: '$0 set <option>[=<value>]' or '$0 remove <option>'"
fi
grub "$1" "$2"
update_zipl
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