Add PKG_CONFIG_PATH to default passenv (#2700)

Author: gaborbernat

docs/changelog/2700.feature.rst

@@ -0,0 +1,2 @@
+Add ``PKG_CONFIG_PATH`` to the default pass through environment list for python tox environments -
+by :user:`gaborbernat`.

src/tox/tox_env/python/api.py

@@ -97,6 +97,7 @@ def _default_pass_env(self) -> list[str]:
                     "NUMBER_OF_PROCESSORS",  # multiprocessing.cpu_count()
                 ],
             )
+        env.extend(["PKG_CONFIG_PATH"])  # used by binary extensions during installation
         env.extend(["REQUESTS_CA_BUNDLE"])
         return env
 

tests/session/cmd/test_show_config.py

@@ -106,7 +106,7 @@ def test_pass_env_config_default(tox_project: ToxProjectCreator, stdout_is_atty:
         + (["PROGRAMDATA"] if is_win else [])
         + (["PROGRAMFILES"] if is_win else [])
         + (["PROGRAMFILES(x86)"] if is_win else [])
-        + ["REQUESTS_CA_BUNDLE", "SSL_CERT_FILE"]
+        + ["PKG_CONFIG_PATH", "REQUESTS_CA_BUNDLE", "SSL_CERT_FILE"]
         + (["SYSTEMDRIVE", "SYSTEMROOT", "TEMP"] if is_win else [])
         + (["TERM"] if stdout_is_atty else [])
         + (["TMP", "USERPROFILE"] if is_win else ["TMPDIR"])