[fix] buildenv: first unset environment / then import searx package

The first import of names from the searx package implies loading the
settings.yml.  Before this is done, the enviroment variables must be unset to
not overwrite the values from the settings.yml

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

utils/build_env.py

@@ -7,15 +7,12 @@ import sys
 import os
 from os.path import realpath, dirname, join, sep, abspath
 
-from searx.version import GIT_URL, GIT_BRANCH
-
 repo_root = realpath(dirname(realpath(__file__)) + sep + '..')
 sys.path.insert(0, repo_root)
 
-# Under the assumption that a brand is always a fork assure that the settings
-# file from reposetorie's working tree is used to generate the build_env, not
-# from /etc/searx/settings.yml.
-os.environ['SEARX_SETTINGS_PATH'] = abspath(dirname(__file__) + sep + 'settings.yml')
+# Assure that the settings file from reposetorie's working tree is used to
+# generate the build_env, not from /etc/searx/settings.yml.
+os.environ['SEARX_SETTINGS_PATH'] = join(repo_root, 'etc', 'settings.yml')
 
 def _env(*arg, **kwargs):
     val = get_setting(*arg, **kwargs)
@@ -49,9 +46,10 @@ for name, option in name_val:
     if not os.environ.get(name, _unset) is _unset:
         del os.environ[name]
 
-# After the variables are unset in the environ, we can import settings
-# (get_setting) from searx module.
+# After the variables are unset in the environ, we can import from the searx
+# package (what will read the values from the settings.yml).
 
+from searx.version import GIT_URL, GIT_BRANCH
 from searx import get_setting
 
 print('build %s (settings from: %s)' % (brand_env, os.environ['SEARX_SETTINGS_PATH']))