From 391dc549c05a3d262a9f7835c8cfa053f0e4e502 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Stradomski?=
 <44680433+pstradomski@users.noreply.github.com>
Date: Thu, 7 Feb 2019 12:56:13 +0100
Subject: [PATCH] Add comment on why realpath is needed

---
 src/_pytest/config/__init__.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/_pytest/config/__init__.py b/src/_pytest/config/__init__.py
index 25e1d65bd..3943f8472 100644
--- a/src/_pytest/config/__init__.py
+++ b/src/_pytest/config/__init__.py
@@ -408,6 +408,9 @@ class PytestPluginManager(PluginManager):
                 continue
             conftestpath = parent.join("conftest.py")
             if conftestpath.isfile():
+                # Use realpath to avoid loading the same conftest twice
+                # with build systems that create build directories containing
+                # symlinks to actual files.
                 mod = self._importconftest(conftestpath.realpath())
                 clist.append(mod)
         self._dirpath2confmods[directory] = clist