Extract verify-configuration.sh from setup-teslausb

setup/pi/verify-configuration.sh

@@ -0,0 +1,28 @@
+#!/bin/bash -eu
+
+function check_variable () {
+  local var_name="$1"
+  if [ -z "${!var_name+x}" ]
+  then
+    setup_progress "STOP: Define the variable $var_name like this: export $var_name=value"
+    exit 1
+  fi
+}
+
+function check_available_space () {
+  setup_progress "Verifying that there is sufficient space available on the MicroSD card..."
+
+  local available_space="$( parted -m /dev/mmcblk0 u b print free | tail -1 | cut -d ":" -f 4 | sed 's/B//g' )"
+
+  if [ "$available_space" -lt  4294967296 ]
+  then
+    setup_progress "STOP: The MicroSD card is too small."
+    exit 1
+  fi
+
+  setup_progress "There is sufficient space available."
+}
+
+check_variable "campercent"
+
+check_available_space