point XDG_*_HOME to temp dirs for tests, fixes #1714

otherwise it spoils the user's nonces and cache dirs with lots of files.

also: remove all BORG_* env vars from the outer environment

1 files changed, 13 insertions, 0 deletions

diff --git a/conftest.py b/conftest.py
index 5caf8a09a..312f57a20 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,5 +1,7 @@
 import os
 
+import pytest
+
 from borg.logger import setup_logging
 
 # Ensure that the loggers exist for all tests
@@ -16,6 +18,17 @@ def pytest_configure(config):
     constants.PBKDF2_ITERATIONS = 1
 
 
+@pytest.fixture(autouse=True)
+def clean_env(tmpdir_factory, monkeypatch):
+    # avoid that we access / modify the user's normal .config / .cache directory:
+    monkeypatch.setenv('XDG_CONFIG_HOME', tmpdir_factory.mktemp('xdg-config-home'))
+    monkeypatch.setenv('XDG_CACHE_HOME', tmpdir_factory.mktemp('xdg-cache-home'))
+    # also avoid to use anything from the outside environment:
+    keys = [key for key in os.environ if key.startswith('BORG_')]
+    for key in keys:
+        monkeypatch.delenv(key, raising=False)
+
+
 def pytest_report_header(config, startdir):
     tests = {
         "BSD flags": has_lchflags,