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Lib/site-packages/virtualenv/app_data/na.py

@@ -0,0 +1,67 @@
+from __future__ import absolute_import, unicode_literals
+
+from contextlib import contextmanager
+
+from .base import AppData, ContentStore
+
+
+class AppDataDisabled(AppData):
+    """No application cache available (most likely as we don't have write permissions)"""
+
+    def __init__(self):
+        pass
+
+    error = RuntimeError("no app data folder available, probably no write access to the folder")
+
+    def close(self):
+        """do nothing"""
+
+    def reset(self):
+        """do nothing"""
+
+    def py_info(self, path):
+        return ContentStoreNA()
+
+    def embed_update_log(self, distribution, for_py_version):
+        return ContentStoreNA()
+
+    def extract(self, path, to_folder):
+        raise self.error
+
+    @contextmanager
+    def locked(self, path):
+        """do nothing"""
+        yield
+
+    @property
+    def house(self):
+        raise self.error
+
+    def wheel_image(self, for_py_version, name):
+        raise self.error
+
+    @property
+    def transient(self):
+        return True
+
+    def py_info_clear(self):
+        """"""
+
+
+class ContentStoreNA(ContentStore):
+    def exists(self):
+        return False
+
+    def read(self):
+        """"""
+        return None
+
+    def write(self, content):
+        """"""
+
+    def remove(self):
+        """"""
+
+    @contextmanager
+    def locked(self):
+        yield