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@karuboniru
Created April 30, 2021 10:15
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#!/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
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