/usr/lib/os-probes/mounted/10freedos 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 | #!/bin/sh
. /usr/share/os-prober/common.sh
partition="$1"
mpoint="$2"
type="$3"
# Weed out stuff that doesn't apply to us
case "$type" in
vfat) debug "$1 is a FAT32 partition" ;;
msdos) debug "$1 is a FAT16 partition" ;;
fat) debug "$1 is a FAT partition (mounted by GRUB)" ;;
*) debug "$1 is not a FAT partition: exiting"; exit 1 ;;
esac
if item_in_dir -q kernel.sys "$2" && item_in_dir -q command.com "$2"; then
label="$(count_next_label FreeDOS)"
result "$1:FreeDOS:$label:chain"
exit 0
else
exit 1
fi
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