Remove eex since it wasn't used

lib/mix/tasks/firmware.gen.script.ex

@@ -13,12 +13,105 @@ defmodule Mix.Tasks.Firmware.Gen.Script do
 
   It saves the script to #{@script_name}.
   """
+
+  @script """
+  #!/bin/sh
+
+  #
+  # Upload new firmware to a device running ssh_subsystem_fwup
+  #
+  # Usage:
+  #   upload.sh [destination IP] [Path to .fw file]
+  #
+  # If unspecified, the destination is nerves.local and the .fw file is naively
+  # guessed
+  #
+  # You may want to add the following to your `~/.ssh/config` to avoid recording
+  # the IP addresses of the target:
+  #
+  # Host nerves.local
+  #   UserKnownHostsFile /dev/null
+  #   StrictHostKeyChecking no
+  #
+  # The firmware update protocol is:
+  #
+  # 1. Connect to the ssh_subsystem_fwup service running on port 22
+  # 2. Send the firmware file
+  # 3. The response from the device is a progress bar from fwup that can either
+  #    be ignored or shown to the user.
+  # 4. The ssh connection is closed with an exit code to indicate success or
+  #    failure
+  #
+  # Feel free to copy this script wherever is convenient. The template is at
+  # https://github.com/nerves-project/ssh_subsystem_fwup/blob/main/priv/templates/script.upload.eex
+  #
+
+  set -e
+
+  DESTINATION=$1
+  FILENAME="$2"
+
+  help() {
+    echo
+    echo "upload.sh [destination IP] [Path to .fw file]"
+    echo
+    echo "Default destination IP is 'nerves.local'"
+    echo "Default firmware bundle is the first .fw file in '_build/\\${MIX_TARGET}_\\${MIX_ENV}/nerves/images'"
+    echo
+    echo "MIX_TARGET=$MIX_TARGET"
+    echo "MIX_ENV=$MIX_ENV"
+    exit 1
+  }
+
+  [ -n "$DESTINATION" ] || DESTINATION=nerves.local
+  if [ -z "$FILENAME" ]; then
+    [ -n "$MIX_TARGET" ] || MIX_TARGET=rpi0
+    [ -n "$MIX_ENV" ] || MIX_ENV=dev
+    FIRMWARE_PATH="./_build/${MIX_TARGET}_${MIX_ENV}/nerves/images"
+    if [ ! -d "$FIRMWARE_PATH" ]; then
+        echo "Can't find the build products."
+        echo
+        echo "Nerves environment"
+        echo "MIX_TARGET:    ${MIX_TARGET}"
+        echo "MIX_ENV:       ${MIX_ENV}"
+        echo
+        echo "Make sure your Nerves environment is correct."
+        echo
+        echo "If the Nerves environment is correct make sure you have built the firmware"
+        echo "using 'mix firmware'."
+        echo
+        echo "If you are uploading a .fw file from a custom path you can specify the"
+        echo "path like so:"
+        echo
+        echo "  $0 <device hostname or IP address> </path/to/my/firmware.fw>"
+        echo
+        exit 1
+    fi
+
+    FILENAME=$(ls "$FIRMWARE_PATH/"*.fw 2> /dev/null | head -n 1)
+    [ -n "$FILENAME" ] || (echo "Error: error determining firmware bundle."; help)
+  fi
+
+  [ -f "$FILENAME" ] || (echo "Error: can't find '$FILENAME'"; help)
+
+  FIRMWARE_METADATA=$(fwup -m -i "$FILENAME" || echo "meta-product=Error reading metadata!")
+  FIRMWARE_PRODUCT=$(echo "$FIRMWARE_METADATA" | grep -E "^meta-product=" -m 1 2>/dev/null | cut -d '=' -f 2- | tr -d '"')
+  FIRMWARE_VERSION=$(echo "$FIRMWARE_METADATA" | grep -E "^meta-version=" -m 1 2>/dev/null | cut -d '=' -f 2- | tr -d '"')
+  FIRMWARE_PLATFORM=$(echo "$FIRMWARE_METADATA" | grep -E "^meta-platform=" -m 1 2>/dev/null | cut -d '=' -f 2- | tr -d '"')
+  FIRMWARE_UUID=$(echo "$FIRMWARE_METADATA" | grep -E "^meta-uuid=" -m 1 2>/dev/null | cut -d '=' -f 2- | tr -d '"')
+
+  echo "Path: $FILENAME"
+  echo "Product: $FIRMWARE_PRODUCT $FIRMWARE_VERSION"
+  echo "UUID: $FIRMWARE_UUID"
+  echo "Platform: $FIRMWARE_PLATFORM"
+  echo
+  echo "Uploading to $DESTINATION..."
+
+  cat "$FILENAME" | ssh -s $SSH_OPTIONS $DESTINATION fwup
+  """
+
   @spec run(keyword()) :: :ok
   def run(_args) do
-    upload_script_contents =
-      Application.app_dir(:ssh_subsystem_fwup, ["priv", "templates", "script.upload.eex"])
-      |> EEx.eval_file([])
-
     if File.exists?(@script_name) do
       Mix.shell().yes?("OK to overwrite #{@script_name}?") || Mix.raise("Aborted")
     end
@@ -27,7 +120,7 @@ defmodule Mix.Tasks.Firmware.Gen.Script do
     Writing #{@script_name}...
     """)
 
-    File.write!(@script_name, upload_script_contents)
+    File.write!(@script_name, @script)
     File.chmod!(@script_name, 0o755)
   end
 end

mix.exs

@@ -54,7 +54,7 @@ defmodule SSHSubsystemFwup.MixProject do
   defp dialyzer() do
     [
       flags: [:race_conditions, :unmatched_returns, :error_handling, :underspecs],
-      plt_add_apps: [:mix, :eex]
+      plt_add_apps: [:mix]
     ]
   end