Update Elixir and Erlang versions (#2892)

.github/workflows/test.yml

@@ -10,7 +10,6 @@ jobs:
     runs-on: ubuntu-latest
     env:
       MIX_ENV: test
-      ELIXIR_ERL_OPTIONS: "-epmd_module Elixir.Livebook.EPMD"
     steps:
       - name: Checkout git repo
         uses: actions/checkout@v4
@@ -65,7 +64,6 @@ jobs:
     if: github.event_name == 'push'
     env:
       MIX_ENV: test
-      ELIXIR_ERL_OPTIONS: "-epmd_module Elixir.Livebook.EPMD"
     steps:
       - name: Configure Git
         run: git config --global core.autocrlf input

lib/livebook/application.ex

@@ -10,7 +10,7 @@ defmodule Livebook.Application do
     ensure_directories!()
     set_local_file_system!()
 
-    validate_epmd_module!()
+    set_epmd_module!()
     start_distribution!()
     set_cookie()
 
@@ -125,19 +125,28 @@ defmodule Livebook.Application do
     :persistent_term.put(:livebook_local_file_system, local_file_system)
   end
 
-  defp validate_epmd_module!() do
+  defp set_epmd_module!() do
     # We use a custom EPMD module. In releases and Escript, we make
     # sure the necessary erl flags are set. When running from source,
-    # those need to be passed explicitly.
+    # we try to use the new :kernel configuration available in OTP 27.2,
+    # otherwise it needs to be set explicitly.
+
+    # TODO: always rely on :kernel configuration once we require OTP 27.2
+
     case :init.get_argument(:epmd_module) do
       {:ok, [[~c"Elixir.Livebook.EPMD"]]} ->
         :ok
 
       _ ->
-        Livebook.Config.abort!("""
-        You must set the environment variable ELIXIR_ERL_OPTIONS="-epmd_module Elixir.Livebook.EPMD" \
-        before the command (and exclusively before the command)
-        """)
+        Application.put_env(:kernel, :epmd_module, Livebook.EPMD, persistent: true)
+
+        # Note: this is a private API
+        if :net_kernel.epmd_module() != Livebook.EPMD do
+          Livebook.Config.abort!("""
+          You must set the environment variable ELIXIR_ERL_OPTIONS="-epmd_module Elixir.Livebook.EPMD" \
+          before the command (and exclusively before the command)
+          """)
+        end
     end
   end
 

lib/livebook/intellisense/identifier_matcher.ex

@@ -742,7 +742,7 @@ defmodule Livebook.Intellisense.IdentifierMatcher do
   defp function_or_macro(_, fun, arity), do: {fun, arity, :function}
 
   defp append_funs_type(funs, type) do
-    Enum.map(funs, &Tuple.append(&1, type))
+    Enum.map(funs, fn {name, arity} -> {name, arity, type} end)
   end
 
   defp match_module_type(mod, hint, ctx) do

lib/livebook/k8s/pod.ex

@@ -177,38 +177,6 @@ defmodule Livebook.K8s.Pod do
   end
 
   defp access_main_container() do
-    access_find(&(&1["name"] == @main_container_name))
-  end
-
-  # TODO: use Access.find/1 once we require Elixir v1.17
-  defp access_find(predicate) when is_function(predicate, 1) do
-    fn op, data, next -> find(op, data, predicate, next) end
-  end
-
-  defp find(:get, data, predicate, next) when is_list(data) do
-    data |> Enum.find(predicate) |> next.()
-  end
-
-  defp find(:get_and_update, data, predicate, next) when is_list(data) do
-    get_and_update_find(data, [], predicate, next)
-  end
-
-  defp find(_op, data, _predicate, _next) do
-    raise "Access.find/1 expected a list, got: #{inspect(data)}"
-  end
-
-  defp get_and_update_find([], updates, _predicate, _next) do
-    {nil, :lists.reverse(updates)}
-  end
-
-  defp get_and_update_find([head | rest], updates, predicate, next) do
-    if predicate.(head) do
-      case next.(head) do
-        {get, update} -> {get, :lists.reverse([update | updates], rest)}
-        :pop -> {head, :lists.reverse(updates, rest)}
-      end
-    else
-      get_and_update_find(rest, [head | updates], predicate, next)
-    end
+    Access.find(&(&1["name"] == @main_container_name))
   end
 end

lib/livebook/live_markdown/markdown_helpers.ex

@@ -345,7 +345,7 @@ defmodule Livebook.LiveMarkdown.MarkdownHelpers do
 
   defp max_length_per_column(cell_grid) do
     cell_grid
-    |> List.zip()
+    |> Enum.zip()
     |> Enum.map(&Tuple.to_list/1)
     |> Enum.map(fn cells ->
       cells

lib/livebook/runtime/erl_dist/runtime_server.ex

@@ -855,7 +855,7 @@ defmodule Livebook.Runtime.ErlDist.RuntimeServer do
     # We propagate Mix.install/2 project dir in the transient state,
     # so that future runtimes can set it as the starting point for
     # Mix.install/2
-    if dir = state.mix_install_project_dir == nil && install_project_dir() do
+    if dir = state.mix_install_project_dir == nil && Mix.install_project_dir() do
       send(state.owner, {:runtime_transient_state, %{mix_install_project_dir: dir}})
       %{state | mix_install_project_dir: dir}
     else
@@ -863,13 +863,6 @@ defmodule Livebook.Runtime.ErlDist.RuntimeServer do
     end
   end
 
-  defp install_project_dir() do
-    # TODO: remove the check once we require Elixir v1.16.2
-    if Code.ensure_loaded?(Mix) && function_exported?(Mix, :install_project_dir, 0) do
-      Mix.install_project_dir()
-    end
-  end
-
   defp scan_binding_async(_ref, %{scan_binding: nil} = info, _state), do: info
 
   # We wait for the current scanning to finish, this way we avoid

mix.exs

@@ -5,7 +5,7 @@ end
 defmodule Livebook.MixProject do
   use Mix.Project
 
-  @elixir_requirement "~> 1.16"
+  @elixir_requirement "~> 1.18.0-rc.0"
   @version "0.15.0-dev"
   @description "Automate code & data workflows with interactive notebooks"
 

test/livebook/runtime/evaluator_test.exs

@@ -697,7 +697,7 @@ defmodule Livebook.Runtime.EvaluatorTest do
                       %{
                         column: 6,
                         details:
-                          "\e[31m** (Protocol.UndefinedError) protocol Enumerable not implemented for 1 of type Integer. " <>
+                          "\e[31m** (Protocol.UndefinedError) protocol Enumerable not implemented for type Integer. " <>
                             _,
                         end_line: 10,
                         line: 9,
@@ -1565,7 +1565,7 @@ defmodule Livebook.Runtime.EvaluatorTest do
                in function  list_to_binary/1
                   called as list_to_binary(1)
                   *** argument 1: not an iolist term
-               in call from erl_eval:do_apply/7 (erl_eval.erl, line 900)\
+               in call from erl_eval:do_apply/7 (erl_eval.erl, line 915)\
              """
     end
   end

versions

@@ -1,5 +1,5 @@
-elixir="1.17.2"
-otp="27.0"
+elixir="1.18.0-rc.0"
+otp="27.2"
 openssl="1.1.1s"
 rebar3="3.22.0"
-ubuntu="jammy-20240530"
+ubuntu="jammy-20240808"