/etc/grub.d/20_memtest86 is in memtest86 4.3.7-3.
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 | #!/bin/sh
set -e
if test -e /boot/memtest86.bin ; then
if [ -f /usr/lib/grub/grub-mkconfig_lib ]; then
. /usr/lib/grub/grub-mkconfig_lib
LX=linux16
elif [ -f /usr/lib/grub/update-grub_lib ]; then
. /usr/lib/grub/update-grub_lib
LX=linux
else
# no grub file, so we notify and exit gracefully
echo "Cannot find grub config file, exiting." >&2
exit 0
fi
MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86.bin" )
echo "Found memtest86 image: $MEMTESTPATH" >&2
cat << EOF
menuentry "Memory test (memtest86)" {
$LX $MEMTESTPATH
}
EOF
fi
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