Create home and data_path directories if missing (#1003)

* Create home and data_path directories if missing

* Update lib/livebook/config.ex

* Configure project-local data path for dev and test env

* Expand dev/test paths in compile config

Co-authored-by: Jonatan Kłosko <jonatanklosko@gmail.com>

config/dev.exs

@@ -71,3 +71,5 @@ config :phoenix, :plug_init_mode, :runtime
 
 # Disable authentication mode during dev
 config :livebook, :authentication_mode, :disabled
+
+config :livebook, :data_path, Path.expand("tmp/livebook_data/dev")

config/test.exs

@@ -14,6 +14,8 @@ config :logger, level: :warn
 # Disable authentication mode during test
 config :livebook, :authentication_mode, :disabled
 
+config :livebook, :data_path, Path.expand("tmp/livebook_data/test")
+
 # Use the embedded runtime in tests by default, so they
 # are cheaper to run. Other runtimes can be tested by starting
 # and setting them explicitly

lib/livebook/application.ex

@@ -6,7 +6,8 @@ defmodule Livebook.Application do
   use Application
 
   def start(_type, _args) do
-    ensure_local_filesystem!()
+    ensure_directories!()
+    set_local_filesystem!()
     ensure_distribution!()
     validate_hostname_resolution!()
     set_cookie()
@@ -55,7 +56,12 @@ defmodule Livebook.Application do
     :ok
   end
 
-  defp ensure_local_filesystem!() do
+  defp ensure_directories!() do
+    File.mkdir_p!(Livebook.Config.home())
+    File.mkdir_p!(Livebook.Config.data_path())
+  end
+
+  defp set_local_filesystem!() do
     home =
       Livebook.Config.home()
       |> Livebook.FileSystem.Utils.ensure_dir_path()