set hostname to tici-<serial_number> (#89)

* set hostname to tici-<serial_number>

* runs as root

userspace/files/serial-hostname.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Sets the hostname to the device's serial number
+
+[Service]
+User=root
+Type=oneshot
+ExecStart=/usr/comma/set-hostname.sh
+
+[Install]
+WantedBy=multi-user.target

userspace/services.sh

@@ -8,6 +8,7 @@ systemctl enable cdsprpcd
 
 # Enable our services
 systemctl enable fs_setup.service
+systemctl enable serial-hostname.service
 systemctl enable comma.service
 systemctl enable gpio.service
 systemctl enable lte.service

userspace/usr/comma/set-hostname.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -e
+
+SERIAL="$(cat /proc/cmdline | sed -e 's/^.*androidboot.serialno=//' -e 's/ .*$//')"
+echo "serial: '$SERIAL'"
+hostname "tici-$SERIAL"