/usr/lib/cruft/explain/grub-legacy is in cruft-common 0.9.34.
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 | #!/bin/dash
d=/boot/grub
set -e
if [ ! -d "$d" ]; then d=/boot/boot/grub; fi
if [ ! -d "$d" ]; then exit 1; fi
if [ "$d" = "/boot/boot/grub" ]; then echo /boot/boot; fi
echo $d
find $d -type f -name stage1 -or -name stage2 -or -name \*_stage1_5 -or -name device.map -or -name menu.lst\* -or -name default
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