Error: Strange wp-config.php file: wp-settings.php is not loaded directly.

gistfile1.txt

mkdir ~/temp && cd temp
git clone https://github.com/markjaquith/WordPress-Skeleton.git wordpress && cd wordpress
git submodule update --init --recursive
wp plugins list --allow-root
# this works, let's say I edit the database credentials

# move WordPress Core back a directory
mv wp ../

# symlink the directory
ln -s ~/temp/wp wp

# wp-config.php needs to point to the correct one
echo '<?php include_once("${_SERVER['DOCUMENT_ROOT']}/wp-config.php");' >> wp/wp-config.php

wp plugins list --allow-root

# this does NOT work
# "Error: Strange wp-config.php file: wp-settings.php is not loaded directly."