Execute VCS command in clean environment

Issue #528
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/util.py

@@ -24,6 +24,7 @@ from django.core.cache import cache
 from importlib import import_module
 import time
 import random
+import os
 
 PLURAL_SEPARATOR = '\x1e\x1e'
 
@@ -144,3 +145,13 @@ def get_configuration_errors():
     Returns all configuration errors.
     """
     return cache.get('configuration-errors', [])
+
+
+def get_clean_env():
+    """
+    Returns cleaned up environment for subprocess execution.
+    """
+    return {
+        'HOME': os.environ['HOME'],
+        'PATH': os.environ['PATH'],
+    }

weblate/trans/vcs.py

@@ -22,6 +22,7 @@ Minimal distributed version control system abstraction for Weblate needs.
 """
 import subprocess
 from dateutil import parser
+from weblate.trans.util import get_clean_env
 
 
 class RepositoryException(Exception):
@@ -63,6 +64,7 @@ class Repository(object):
         process = subprocess.Popen(
             args,
             cwd=cwd,
+            env=get_clean_env(),
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
         )