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#!/bin/bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
export LANG=C
COMMAND="$1"
KERNEL_VERSION="$2"
BOOT_DIR_ABS="${3%/*}/0-rescue"
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 [[ ! -f /etc/machine-id ]] || [[ ! -s /etc/machine-id ]]; then
systemd-machine-id-setup
fi
[[ -f /etc/machine-id ]] && read MACHINE_ID < /etc/machine-id
if [[ -f /etc/kernel/cmdline ]]; then
readarray -t BOOT_OPTIONS < /etc/kernel/cmdline
fi
if ! [[ "${BOOT_OPTIONS[@]}" ]]; then
readarray -t BOOT_OPTIONS < /proc/cmdline
fi
if ! [[ $BOOT_OPTIONS ]]; then
exit 1
fi
LOADER_ENTRY="/boot/loader/entries/${MACHINE_ID}-0-rescue.conf"
BOOT_DIR="/${MACHINE_ID}/0-rescue"
ret=0
case "$COMMAND" in
add)
for i in "/boot/loader/entries/${MACHINE_ID}-0-rescue.conf"; do
[[ -f $i ]] && exit 0
done
# source our config dir
for f in $(dropindirs_sort ".conf" "/etc/dracut.conf.d" "/usr/lib/dracut/dracut.conf.d"); do
[[ -e $f ]] && . "$f"
done
[[ $dracut_rescue_image != "yes" ]] && exit 0
[[ -d "$BOOT_DIR_ABS" ]] || mkdir -p "$BOOT_DIR_ABS"
if ! cp "$KERNEL_IMAGE" "$BOOT_DIR_ABS"/linux; then
echo "Can't copy '$KERNEL_IMAGE to '$BOOT_DIR_ABS/linux'!" >&2
fi
dracut --no-hostonly -a "rescue" "$BOOT_DIR_ABS"/initrd "$2"
((ret+=$?))
{
echo "title $PRETTY_NAME - Rescue Image"
echo "version $KERNEL_VERSION"
echo "machine-id $MACHINE_ID"
echo "options ${BOOT_OPTIONS[@]} rd.auto=1"
echo "linux $BOOT_DIR/linux"
echo "initrd $BOOT_DIR/initrd"
} > $LOADER_ENTRY
((ret+=$?))
;;
remove)
exit 0
;;
*)
usage
ret=1;;
esac
((ret+=$?))
exit $ret
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