Enable setting config securely in firmware/config/secrets.exs

README.md

@@ -12,6 +12,7 @@ If you have found the source code before finding the geocache, consider it a hin
 
 Building:
 ```bash
+export MIX_ENV=prod && export MIX_TARGET=<device>
 cd ui/assets && npm install
 cd ../ && mix phx.digest
 cd ../firmware && mix deps.get
@@ -20,12 +21,9 @@ mix firmware.burn # After inserting SD card
 ```
 
 ## Setting morse code
-Still have to find out how to correctly set secrets... so I have to do it manually now.
-
-```bash
-ssh nerves.local
-```
-
+To set the morse code, create a new file under firmware/config, called secrets.exs:
 ```elixir
-System.set_env("MORSE_MESSAGE", "...---...")
+use Mix.Config
+
+config :morse, :morse_message, "...---..."
 ```

firmware/config/secrets.exs

@@ -0,0 +1,3 @@
+use Mix.Config
+
+config :morse, :morse_message, "................"

firmware/config/target.exs

@@ -37,6 +37,10 @@ config :nerves_init_gadget,
   node_name: node_name,
   node_host: :mdns_domain
 
+if File.exists?("config/secrets.exs") do
+  import_config "secrets.exs"
+end
+
 # Import target specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 # Uncomment to use target specific configurations

morse/.gitignore

@@ -21,4 +21,3 @@ erl_crash.dump
 
 # Ignore package tarball (built via "mix hex.build").
 morse-*.tar
-

morse/lib/morse.ex

@@ -21,12 +21,7 @@ defmodule Morse do
   """
 
   def signal do
-    case System.get_env("MORSE_MESSAGE") do
-      nil ->
-        # Signal for SOS if the env variable wasn't found :)
-        signal("...---...")
-      message -> signal(message)
-    end
+    signal(Application.fetch_env!(:morse, :morse_message))
   end
 
   def signal(symbols) do

morse/mix.exs

@@ -14,7 +14,8 @@ defmodule Morse.MixProject do
   # Run "mix help compile.app" to learn about applications.
   def application do
     [
-      extra_applications: [:logger]
+      extra_applications: [:logger],
+      env: [morse_message: "...---..."]
     ]
   end
 

ui/.gitignore

@@ -32,3 +32,5 @@ npm-debug.log
 # we ignore priv/static. You may want to comment
 # this depending on your deployment strategy.
 /priv/static/
+
+config/secrets.exs