Add a new script to prep sdcards containing raspian-lite. This will add the flags and config to the /boot mount that allows the raspberry pi to be accessed via SSH on boot, and allows it to be used as an ethernet device over USB.

scripts/sdcard.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+if ! [ -d "${1}" ]; then 
+	echo "No path defined"
+	echo "Syntax: sh sdcard.sh /path/to/sdcard/boot/"
+	exit 1
+fi
+
+CARD_PATH=${1}
+START_PATH=$(pwd)
+CONFIG_FILE="./config.txt"
+CMD_FILE="./cmdline.txt"
+TMP_FILE=$(mktemp)
+
+echo $TMP_FILE
+echo "Preparing card for raspberry pi @ $CARD_PATH"
+
+cd $CARD_PATH
+echo "Enabling ssh on first boot"
+touch ssh
+
+if ! grep "dtoverlay=dwc2" $CONFIG_FILE; then
+	echo "Adding line dtoverlay=dwc2 to $CONFIG_FILE"
+	echo "dtoverlay=dwc2" >> $CONFIG_FILE
+else
+	echo "$CONFIG_FILE already correct"
+fi
+
+if ! grep "modules-load=dwc2,g_ether" $CMD_FILE; then
+	echo "Adding modiles-load=dwc2,g_ether"
+	sed 's:rootwait :rootwait modules-load=dwc2,g_ether :g' $CMD_FILE >> $TMP_FILE
+	mv $TMP_FILE $CMD_FILE
+else
+	echo "$CMD_FILE already correct"
+fi
+
+cd $START_PATH