Always append paths and archives when Mix app starts

Author: josevalim

lib/mix/lib/mix.ex

@@ -387,13 +387,22 @@ defmodule Mix do
     :ok
   end
 
-  @doc false
+  @impl true
   def start(_type, []) do
+    Mix.Local.append_archives()
+    Mix.Local.append_paths()
     children = [Mix.State, Mix.TasksServer, Mix.ProjectStack]
     opts = [strategy: :one_for_one, name: Mix.Supervisor, max_restarts: 0]
     Supervisor.start_link(children, opts)
   end
 
+  @impl true
+  def stop(_data) do
+    Mix.Local.remove_archives()
+    Mix.Local.remove_paths()
+    :ok
+  end
+
   @doc """
   Returns the current Mix environment.
 
@@ -827,7 +836,6 @@ defmodule Mix do
         ]
 
         started_apps = Application.started_applications()
-        :ok = Mix.Local.append_archives()
         :ok = Mix.ProjectStack.push(@mix_install_project, config, "nofile")
         build_dir = Path.join(install_dir, "_build")
         external_lockfile = expand_path(opts[:lockfile], deps, :lockfile, "mix.lock")

lib/mix/lib/mix/cli.ex

@@ -5,8 +5,6 @@ defmodule Mix.CLI do
   Runs Mix according to the command line arguments.
   """
   def main(args \\ System.argv()) do
-    Mix.Local.append_archives()
-    Mix.Local.append_paths()
     Mix.start()
 
     if env_variable_activated?("MIX_QUIET"), do: Mix.shell(Mix.Shell.Quiet)

lib/mix/lib/mix/local.ex

@@ -78,6 +78,13 @@ defmodule Mix.Local do
     Enum.each(mix_paths(), &Code.append_path/1)
   end
 
+  @doc """
+  Removes Mix paths from the Erlang code path.
+  """
+  def remove_paths do
+    Enum.each(mix_paths(), &Code.delete_path/1)
+  end
+
   defp mix_paths do
     if path = System.get_env("MIX_PATH") do
       String.split(path, path_separator())