hostname: Generate a unique hostname once

This picks a random adjective-noun combination using two wordlists of 26 words
each, giving us a random domain of 676 possible human-readable names to refer to
our boards with.

Change-Id: If7c3ff814fa4321322e42c7afa999cc28c467b2c

etc/runonce.d/01-generate-hostname

diff --git a/etc/runonce.d/01-generate-hostname b/etc/runonce.d/01-generate-hostname
new file mode 100755
index 0000000..e0a6516
--- /dev/null
+++ b/etc/runonce.d/01-generate-hostname
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+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 /tmp/adjectives.txt)
+    local noun=$(random_word /tmp/nouns.txt)
+
+    echo "${adj}-${noun}"
+}
+
+hostname=$(generate_hostname)
+echo $hostname >/etc/hostname
+/usr/bin/hostnamectl set-hostname $hostname

etc/runonce.d/02-enable-services

diff --git a/etc/runonce.d/01-enable-services b/etc/runonce.d/02-enable-services
similarity index 100%
rename from etc/runonce.d/01-enable-services
rename to etc/runonce.d/02-enable-services

etc/runonce.d/03-check-ssh-keys

diff --git a/etc/runonce.d/02-check-ssh-keys b/etc/runonce.d/03-check-ssh-keys
similarity index 100%
rename from etc/runonce.d/02-check-ssh-keys
rename to etc/runonce.d/03-check-ssh-keys

etc/services/mdt.service

diff --git a/etc/services/mdt.service b/etc/services/mdt.service
new file mode 100644
index 0000000..99c50eb
--- /dev/null
+++ b/etc/services/mdt.service
@@ -0,0 +1,8 @@
+<service-group>
+  <name replace-wildcards="yes">%h</name>
+
+  <service>
+    <type>_google._mdt._tcp</type>
+    <port>22</port>
+  </service>
+</service-group>

usr/share/aiy-board-tweaks/adjectives.txt

diff --git a/usr/share/aiy-board-tweaks/adjectives.txt b/usr/share/aiy-board-tweaks/adjectives.txt
new file mode 100644
index 0000000..49a4c93
--- /dev/null
+++ b/usr/share/aiy-board-tweaks/adjectives.txt
@@ -0,0 +1,26 @@
+arid
+bored
+coy
+deft
+elusive
+fun
+green
+hopeful
+indigo
+jumping
+king
+lime
+mocha
+neat
+orange
+purple
+queen
+red
+silly
+tuned
+undefined
+vexing
+wishful
+xenial
+yellow
+zippy

usr/share/aiy-board-tweaks/nouns.txt

diff --git a/usr/share/aiy-board-tweaks/nouns.txt b/usr/share/aiy-board-tweaks/nouns.txt
new file mode 100644
index 0000000..b55eec0
--- /dev/null
+++ b/usr/share/aiy-board-tweaks/nouns.txt
@@ -0,0 +1,26 @@
+apple
+bunny
+calf
+dog
+eft
+finch
+goose
+horse
+ibis
+jet
+kid
+llama
+mole
+nexus
+orange
+pig
+quill
+rabbit
+snail
+tang
+umpire
+valet
+wasp
+xylophone
+yarn
+zebra