1 files changed, 46 insertions, 0 deletions
diff --git a/lib/ansible/_vendor/__init__.py b/lib/ansible/_vendor/__init__.py
new file mode 100644
index 0000000..a31957b
--- /dev/null
+++ b/lib/ansible/_vendor/__init__.py
@@ -0,0 +1,46 @@
+# (c) 2020 Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import pkgutil
+import sys
+import warnings
+
+# This package exists to host vendored top-level Python packages for downstream packaging. Any Python packages
+# installed beneath this one will be masked from the Ansible loader, and available from the front of sys.path.
+# It is expected that the vendored packages will be loaded very early, so a warning will be fired on import of
+# the top-level ansible package if any packages beneath this are already loaded at that point.
+#
+# Python packages may be installed here during downstream packaging using something like:
+# pip install --upgrade -t (path to this dir) cryptography pyyaml packaging jinja2
+
+# mask vendored content below this package from being accessed as an ansible subpackage
+__path__ = []
+
+
+def _ensure_vendored_path_entry():
+    """
+    Ensure that any downstream-bundled content beneath this package is available at the top of sys.path
+    """
+    # patch our vendored dir onto sys.path
+    vendored_path_entry = os.path.dirname(__file__)
+    vendored_module_names = set(m[1] for m in pkgutil.iter_modules([vendored_path_entry], ''))  # m[1] == m.name
+
+    if vendored_module_names:
+        # patch us early to load vendored deps transparently
+        if vendored_path_entry in sys.path:
+            # handle reload case by removing the existing entry, wherever it might be
+            sys.path.remove(vendored_path_entry)
+        sys.path.insert(0, vendored_path_entry)
+
+        already_loaded_vendored_modules = set(sys.modules.keys()).intersection(vendored_module_names)
+
+        if already_loaded_vendored_modules:
+            warnings.warn('One or more Python packages bundled by this ansible-core distribution were already '
+                          'loaded ({0}). This may result in undefined behavior.'.format(', '.join(sorted(already_loaded_vendored_modules))))
+
+
+_ensure_vendored_path_entry()