/usr/share/initramfs-tools/scripts/casper-bottom/01integrity_check is in casper 1.394.
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 | #!/bin/sh
PREREQ=""
prereqs()
{
echo "$PREREQ"
}
case $1 in
# get pre-requisites
prereqs)
prereqs
exit 0
;;
esac
if grep -q integrity-check /proc/cmdline; then
casper-md5check /cdrom /cdrom/md5sum.txt < /dev/tty8 > /dev/tty8
reboot
while :; do sleep 60; done
fi
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