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✏️ Editing: 90fallback

#!/bin/sh
# Fallback in case nothing else works. Look for vmlinu[xz] file in root and
# /boot, see if there is a matching initrd, and wing it.
. /usr/share/os-prober/common.sh
set -e

partition="$1"
bootpart="$2"
mpoint="$3"
type="$4"

mappedpartition=$(mapdevfs "$partition" 2>/dev/null) || mappedpartition="$partition"
kernparams="root=$mappedpartition"

# In case there is $mpoint/etc/default/grub, source it and take into account
# relevant command line variables. This function must be run inside a subshell
# otherwise grub default variable may be overriden
get_cmdline_linux_params()
{
    local mpoint_sysconfdir="$mpoint/etc"
    if test -f ${mpoint_sysconfdir}/default/grub ; then
	unset GRUB_CMDLINE_LINUX GRUB_CMDLINE_LINUX_DEFAULT
	. ${mpoint_sysconfdir}/default/grub
	echo "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
    fi
}

kernparams="$(echo $kernparams $(get_cmdline_linux_params) | sed 's/[[:space:]]\+$//')"

exitcode=1
for kernpat in /vmlinuz /vmlinux /boot/vmlinuz /boot/vmlinux "/boot/vmlinuz*" \
	        "/boot/vmlinux*" "/vmlinuz*" "/vmlinux*" "/kernel-*" "/boot/kernel-*"; do
	if echo "$kernpat" | grep -q boot/; then
		kernbootpart="$bootpart"
	else
		kernbootpart="$partition"
	fi
	for kernfile in $(eval ls "$mpoint$kernpat" 2>/dev/null); do
		kernbasefile=$(echo "$kernfile" | sed "s!^$mpoint!!")
		if [ -f "$kernfile" ] && [ ! -L "$kernfile" ]; then
			initrdname=$(echo "$kernfile" | sed "s/vmlinu[zx]/initrd\*/")
			# Yellow Dog Linux appends .img to it.
			initrdname1="${initrdname}.img"
			# Arch Linux names its initrds weirdly.  We take
			# some care here to avoid false positives on other
			# systems, since kernel.img could conceivably be a
			# kernel itself.
			initrdname2=$(echo "$kernfile" | sed -n 's/vmlinu[zx]$[0-9][0-9]*$/kernel\1/p' | sed 's/$/.img/')
			# Dracut initramfses are named differently again.
			initrdname3=$(echo "$kernfile" | sed "s/vmlinu[zx]/initramfs\*/" | sed 's/$/.img/')
			# And Gentoo's also
			initrdname4=$(echo "$kernfile" | sed "s/kernel\|vmlinu[zx]/initramfs\*/")
			foundinitrd=0
			for initrd in $(eval ls "$initrdname" "$initrdname1" "$initrdname2" "$initrdname3" "$initrdname4" 2>/dev/null); do
				if [ "$initrd" != "$kernfile" ] && [ -f "$initrd" ] && [ ! -L "$initrd" ]; then
					initrd=$(echo "$initrd" | sed "s!^$mpoint!!")
					result "$partition:$kernbootpart::$kernbasefile:$initrd:$kernparams"
					exitcode=0
					foundinitrd=1
				fi
			done
			if [ "$foundinitrd" = 0 ]; then
				result "$partition:$kernbootpart::$kernbasefile::root=$mappedpartition"
				exitcode=0
			fi
		fi
	done
done
exit "$exitcode"

MR SKB