require Elixir 1.15+ in new apps

Closes #5276.

.github/workflows/ci.yml

@@ -22,8 +22,8 @@ jobs:
           - elixir: 1.14.5
             otp: 25.3.2.9
 
-          - elixir: 1.17.2
-            otp: 27.0
+          - elixir: 1.17.3
+            otp: 27.1
             lint: true
             installer: true
 
@@ -111,13 +111,13 @@ jobs:
       matrix:
         include:
           # look for correct alpine image here: https://hub.docker.com/r/hexpm/elixir/tags
-          - elixir: 1.14.5
-            otp: 25.3.2.12
-            suffix: "alpine-3.19.1"
+          - elixir: 1.15.8
+            otp: 24.3.4.17
+            suffix: "debian-bookworm-20241016-slim"
 
-          - elixir: 1.16.2
-            otp: 26.2.5
-            suffix: "alpine-3.19.1"
+          - elixir: 1.17.3
+            otp: 27.1.2
+            suffix: "debian-bookworm-20241016-slim"
 
     container:
       image: hexpm/elixir:${{ matrix.elixir }}-erlang-${{ matrix.otp }}-${{ matrix.suffix }}

guides/deployment/heroku.md

@@ -97,11 +97,11 @@ The buildpack uses a predefined Elixir and Erlang version, but to avoid surprise
 
 ```console
 # Elixir version
-elixir_version=1.14.0
+elixir_version=1.15.0
 
 # Erlang version
 # https://github.com/HashNuke/heroku-buildpack-elixir-otp-builds/blob/master/otp-versions
-erlang_version=24.3
+erlang_version=25.3
 
 # Invoke assets.deploy defined in your mix.exs to deploy assets with esbuild
 # Note we nuke the esbuild executable from the image

guides/deployment/releases.md

@@ -169,11 +169,11 @@ If you call `mix phx.gen.release --docker` you'll see a new file with these cont
 #   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
 #   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20230612-slim - for the release image
 #   - https://pkgs.org/ - resource for finding needed packages
-#   - Ex: hexpm/elixir:1.14.5-erlang-25.3.2.4-debian-bullseye-20230612-slim
+#   - Ex: hexpm/elixir:1.15.8-erlang-25.3.2.15-debian-bookworm-20241016-slim
 #
-ARG ELIXIR_VERSION=1.14.5
-ARG OTP_VERSION=25.3.2.4
-ARG DEBIAN_VERSION=bullseye-20230612-slim
+ARG ELIXIR_VERSION=1.15.8
+ARG OTP_VERSION=25.3.2.15
+ARG DEBIAN_VERSION=bookworm-20241016-slim
 
 ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
 ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"

guides/introduction/installation.md

@@ -8,7 +8,7 @@ In order to build a Phoenix application, we will need a few dependencies install
 
 Please take a look at this list and make sure to install anything necessary for your system. Having dependencies installed in advance can prevent frustrating problems later on.
 
-## Elixir 1.14 or later
+## Elixir 1.15 or later
 
 Phoenix is written in Elixir, and our application code will also be written in Elixir. We won't get far in a Phoenix app without it! The Elixir site maintains a great [Installation Page](https://elixir-lang.org/install.html) to help.
 
@@ -28,13 +28,13 @@ When we install Elixir using instructions from the Elixir [Installation Page](ht
 
 ## Phoenix
 
-To check that we are on Elixir 1.14 and Erlang 24 or later, run:
+To check that we are on Elixir 1.15 and Erlang 24 or later, run:
 
 ```console
 elixir -v
 Erlang/OTP 24 [erts-12.0] [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]
 
-Elixir 1.14.0
+Elixir 1.15.0
 ```
 
 Once we have Elixir and Erlang, we are ready to install the Phoenix application generator:

installer/lib/mix/tasks/phx.new.ex

@@ -223,9 +223,7 @@ defmodule Mix.Tasks.Phx.New do
             Task.async(fn -> cmd(project, cmd, log: false, cd: project.web_path) end)
           end)
 
-        if rebar_available?() do
-          cmd(project, "mix deps.compile")
-        end
+        cmd(project, "mix deps.compile")
 
         Task.await_many(tasks, :infinity)
       end
@@ -254,28 +252,13 @@ defmodule Mix.Tasks.Phx.New do
   defp maybe_cd(path, func), do: path && File.cd!(path, func)
 
   defp install_mix(project, install?) do
-    if install? && hex_available?() do
+    if install? do
       cmd(project, "mix deps.get")
     else
       ["$ mix deps.get"]
     end
   end
 
-  # TODO: Elixir v1.15 automatically installs Hex/Rebar if missing, so we can simplify this.
-  defp hex_available? do
-    Code.ensure_loaded?(Hex)
-  end
-
-  if Version.match?(System.version(), "~> 1.18") do
-    defp rebar_available? do
-      true
-    end
-  else
-    defp rebar_available? do
-      Mix.Rebar.rebar_cmd(:rebar3)
-    end
-  end
-
   defp print_missing_steps(steps) do
     Mix.shell().info("""
 
@@ -395,9 +378,9 @@ defmodule Mix.Tasks.Phx.New do
   end
 
   defp elixir_version_check! do
-    unless Version.match?(System.version(), "~> 1.14") do
+    unless Version.match?(System.version(), "~> 1.15") do
       Mix.raise(
-        "Phoenix v#{@version} requires at least Elixir v1.14\n " <>
+        "Phoenix v#{@version} requires at least Elixir v1.15\n " <>
           "You have #{System.version()}. Please update accordingly"
       )
     end

installer/mix.exs

@@ -17,7 +17,7 @@ defmodule Phx.New.MixProject do
   #   4. test/test_helper.exs at the root
   #   5. installer/lib/mix/tasks/phx.new.ex
   #
-  @elixir_requirement "~> 1.14"
+  @elixir_requirement "~> 1.15"
 
   def project do
     [

installer/templates/phx_single/config/config.exs

@@ -56,7 +56,7 @@ config :tailwind,
   ]<% end %>
 
 # Configures Elixir's Logger
-config :logger, :console,
+config :logger, :default_formatter,
   format: "$time $metadata[$level] $message\n",
   metadata: [:request_id]
 

installer/templates/phx_single/mix.exs

@@ -9,7 +9,7 @@ defmodule <%= @app_module %>.MixProject do
       config_path: "../../config/config.exs",
       deps_path: "../../deps",
       lockfile: "../../mix.lock",<% end %>
-      elixir: "~> 1.14",
+      elixir: "~> 1.15",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),

installer/templates/phx_umbrella/apps/app_name/mix.exs

@@ -9,7 +9,7 @@ defmodule <%= @app_module %>.MixProject do
       config_path: "../../config/config.exs",
       deps_path: "../../deps",
       lockfile: "../../mix.lock",
-      elixir: "~> 1.14",
+      elixir: "~> 1.15",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),

installer/templates/phx_umbrella/apps/app_name_web/mix.exs

@@ -9,7 +9,7 @@ defmodule <%= @web_namespace %>.MixProject do
       config_path: "../../config/config.exs",
       deps_path: "../../deps",
       lockfile: "../../mix.lock",
-      elixir: "~> 1.14",
+      elixir: "~> 1.15",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       aliases: aliases(),

installer/templates/phx_umbrella/config/dev.exs

@@ -1,7 +1,7 @@
 import Config
 
 # Do not include metadata nor timestamps in development logs
-config :logger, :console, format: "[$level] $message\n"
+config :logger, :default_formatter, format: "[$level] $message\n"
 
 # Initialize plugs at runtime for faster development compilation
 config :phoenix, :plug_init_mode, :runtime<%= if @html do %>

installer/templates/phx_umbrella/config/extra_config.exs

@@ -1,7 +1,7 @@
 import Config
 
 # Configures Elixir's Logger
-config :logger, :console,
+config :logger, :default_formatter,
   format: "$time $metadata[$level] $message\n",
   metadata: [:request_id]
 

integration_test/mix.exs

@@ -10,7 +10,7 @@ defmodule Phoenix.Integration.MixProject do
     [
       app: :phoenix_integration,
       version: "0.1.0",
-      elixir: "~> 1.14",
+      elixir: "~> 1.15",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       deps: deps()

test/test_helper.exs

@@ -26,7 +26,7 @@ assert_timeout = String.to_integer(
 )
 
 excludes =
-  if Version.match?(System.version(), "~> 1.14") do
+  if Version.match?(System.version(), "~> 1.15") do
     []
   else
     [:mix_phx_new]