/usr/share/doc/live-config/examples/hooks/passwd is in live-config-doc 5.20170112+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 | #!/bin/sh
echo
echo "live-config hook: passwd"
_USERNAME=""
while [ "${_USERNAME}" != q ]
do
echo
echo -n "Enter username [q for quit]: "
read _USERNAME
_USERNAME="${_USERNAME:-${LIVE_USERNAME}}"
case "${_USERNAME}" in
root)
passwd
;;
*)
if [ -n "${_USERNAME}" ]
then
echo
passwd "${_USERNAME}"
fi
;;
esac
done
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