etc/runonce.d/01-generate-hostname

#!/bin/bash

ADJECTIVES_FILE=/usr/share/aiy-board-tweaks/adjectives.txt
NOUNS_FILE=/usr/share/aiy-board-tweaks/nouns.txt

random_word()
{
    local wordlist=$1; shift
    local max=$(wc -l $wordlist |awk '{ print $1 }')
    local line=$(($RANDOM % $max + 1))

    head -n $line $wordlist |tail -n 1
}

generate_hostname()
{
    local adj=$(random_word $ADJECTIVES_FILE)
    local noun=$(random_word $NOUNS_FILE)

    echo "${adj}-${noun}"
}

hostname=$(generate_hostname)
echo $hostname >/etc/hostname
/bin/hostname $hostname
/usr/bin/hostnamectl set-hostname $hostname
echo 127.0.0.1 $hostname >>/etc/hosts