From 930ec697398517f2b255c5660adf30ac2689ca33 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@dashbit.co>
Date: Fri, 21 Feb 2025 11:01:36 +0100
Subject: [PATCH] Support --no-listeners in loadpaths

---
 lib/mix/lib/mix/tasks/deps.loadpaths.ex | 5 ++++-
 lib/mix/lib/mix/tasks/loadpaths.ex      | 1 +
 lib/mix/test/mix/tasks/compile_test.exs | 4 ++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/mix/lib/mix/tasks/deps.loadpaths.ex b/lib/mix/lib/mix/tasks/deps.loadpaths.ex
index d7daa070738..b8bba13e019 100644
--- a/lib/mix/lib/mix/tasks/deps.loadpaths.ex
+++ b/lib/mix/lib/mix/tasks/deps.loadpaths.ex
@@ -23,6 +23,7 @@ defmodule Mix.Tasks.Deps.Loadpaths do
     * `--no-compile` - does not compile even if files require compilation
     * `--no-deps-check` - does not check or compile deps, only load available ones
     * `--no-elixir-version-check` - does not check Elixir version
+    * `--no-listeners` - does not start Mix listeners
     * `--no-optional-deps` - does not compile or load optional deps
 
   """
@@ -71,7 +72,9 @@ defmodule Mix.Tasks.Deps.Loadpaths do
 
     # For now we only allow listeners defined in dependencies, so
     # we start them right after adding adding deps to the path
-    Mix.PubSub.start_listeners()
+    if "--no-listeners" not in args do
+      Mix.PubSub.start_listeners()
+    end
 
     :ok
   end
diff --git a/lib/mix/lib/mix/tasks/loadpaths.ex b/lib/mix/lib/mix/tasks/loadpaths.ex
index fffe930f5fc..5d0cc2bc4d8 100644
--- a/lib/mix/lib/mix/tasks/loadpaths.ex
+++ b/lib/mix/lib/mix/tasks/loadpaths.ex
@@ -21,6 +21,7 @@ defmodule Mix.Tasks.Loadpaths do
     * `--no-compile` - does not compile dependencies, only check and load them
     * `--no-deps-check` - does not check dependencies, only load available ones
     * `--no-elixir-version-check` - does not check Elixir version
+    * `--no-listeners` - does not start Mix listeners
     * `--no-optional-deps` - does not compile or load optional deps
 
   """
diff --git a/lib/mix/test/mix/tasks/compile_test.exs b/lib/mix/test/mix/tasks/compile_test.exs
index 2ecf29cbeb7..088887403d1 100644
--- a/lib/mix/test/mix/tasks/compile_test.exs
+++ b/lib/mix/test/mix/tasks/compile_test.exs
@@ -389,6 +389,10 @@ defmodule Mix.Tasks.CompileTest do
       File.write!("src/b.erl", "-module(b).")
       File.write!("src/c.erl", "-module(c).")
 
+      # Ensure we can boot with compilation and listeners if desired
+      assert mix(["loadpaths", "--no-compile", "--no-listeners"]) == ""
+
+      # Now setup dependencies
       mix(["deps.compile"])
 
       parent = self()