/usr/lib/linux-boot-probes/mounted/90fallback is in os-prober 1.76~deb9u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | #!/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"
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/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:$initrd:root=$mappedpartition"
exitcode=0
foundinitrd=1
fi
done
if [ "$foundinitrd" = 0 ]; then
result "$partition:$kernbootpart::$kernbasefile::root=$mappedpartition"
exitcode=0
fi
fi
done
done
exit "$exitcode"
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