Add firmware commit to bot state

lib/farmbot/bot_state/bot_state.ex

@@ -9,6 +9,7 @@ defmodule Farmbot.BotState do
   use GenStage
   @version Farmbot.Project.version()
   @commit Farmbot.Project.commit()
+  @arduino_commit Farmbot.Project.arduino_commit()
   @target Farmbot.Project.target()
   @env Farmbot.Project.env()
 
@@ -282,6 +283,7 @@ defmodule Farmbot.BotState do
     informational_settings: %{
       controller_version: @version,
       firmware_version: "disconnected",
+      firmware_commit: @arduino_commit,
       commit: @commit,
       target: @target,
       env: @env,

lib/farmbot/project.ex

@@ -4,6 +4,7 @@ defmodule Farmbot.Project do
   @version Mix.Project.config[:version]
   @target Mix.Project.config[:target]
   @commit Mix.Project.config[:commit]
+  @arduino_commit Mix.Project.config[:arduino_commit]
   @env Mix.env()
 
   @doc "*#{@version}*"
@@ -14,6 +15,10 @@ defmodule Farmbot.Project do
   @compile {:inline, commit: 0}
   def commit, do: @commit
 
+  @doc "*#{@arduino_commit}*"
+  @compile {:inline, arduino_commit: 0}
+  def arduino_commit, do: @arduino_commit
+
   @doc "*#{@target}*"
   @compile {:inline, target: 0}
   def target, do: @target

mix.exs

@@ -3,10 +3,15 @@ defmodule Farmbot.Mixfile do
   @target System.get_env("MIX_TARGET") || "host"
   @version Path.join(__DIR__, "VERSION") |> File.read!() |> String.trim()
 
-  defp commit() do
+  defp commit do
     System.cmd("git", ~w"rev-parse --verify HEAD") |> elem(0) |> String.trim()
   end
 
+  defp arduino_commit do
+    opts = [cd: "c_src/farmbot-arduino-firmware"]
+    System.cmd("git", ~w"rev-parse --verify HEAD", opts) |> elem(0) |> String.trim()
+  end
+
   Mix.shell().info([
     :green,
     """
@@ -28,6 +33,7 @@ defmodule Farmbot.Mixfile do
       version: @version,
       target: @target,
       commit: commit(),
+      arduino_commit: arduino_commit(),
       archives: [nerves_bootstrap: "~> 0.6.0"],
       build_embedded: Mix.env() == :prod,
       start_permanent: Mix.env() == :prod,