Fix #2527: Add ability to suppress nested venv courtesy notice

pipenv/core.py

@@ -1631,19 +1631,28 @@ def gen(out):
 
 
 def warn_in_virtualenv():
-    from .environments import PIPENV_USE_SYSTEM, PIPENV_VIRTUALENV
+    from .environments import (
+        PIPENV_USE_SYSTEM,
+        PIPENV_VIRTUALENV,
+        PIPENV_VERBOSITY,
+    )
 
     # Only warn if pipenv isn't already active.
     pipenv_active = os.environ.get("PIPENV_ACTIVE")
-    if (PIPENV_USE_SYSTEM or PIPENV_VIRTUALENV) and not pipenv_active:
+    if (
+        (PIPENV_USE_SYSTEM or PIPENV_VIRTUALENV)
+        and not (pipenv_active or PIPENV_VERBOSITY > 0)
+    ):
         click.echo(
             "{0}: Pipenv found itself running within a virtual environment, "
             "so it will automatically use that environment, instead of "
             "creating its own for any project. You can set "
             "{1} to force pipenv to ignore that environment and create "
-            "its own instead.".format(
+            "its own instead. You can set {2} to suppress this "
+            "warning.".format(
                 crayons.green("Courtesy Notice"),
                 crayons.normal("PIPENV_IGNORE_VIRTUALENVS=1", bold=True),
+                crayons.normal("PIPENV_VERBOSITY=1", bold=True),
             ),
             err=True,
         )

pipenv/environments.py

@@ -174,6 +174,12 @@
 Default is to create new virtual environments in a global location.
 """
 
+PIPENV_VERBOSITY = int(os.environ.get("PIPENV_VERBOSITY", "0"))
+"""Verbosity setting for pipenv. Higher values make pipenv less verbose.
+
+Default is 0, for maximum verbosity.
+"""
+
 PIPENV_YES = bool(os.environ.get("PIPENV_YES"))
 """If set, Pipenv automatically assumes "yes" at all prompts.
 

tests/unit/test_core.py

@@ -0,0 +1,15 @@
+import pytest
+import mock
+
+from pipenv.core import warn_in_virtualenv
+
+
+@mock.patch('pipenv.environments.PIPENV_VIRTUALENV', 'totallyrealenv')
+@mock.patch('pipenv.environments.PIPENV_VERBOSITY', 1)
+@pytest.mark.core
+def test_suppress_nested_venv_warning(capsys):
+    # Capture the stderr of warn_in_virtualenv to test for the presence of the
+    # courtesy notice.
+    warn_in_virtualenv()
+    output, err = capsys.readouterr()
+    assert 'Courtesy Notice' not in err