Enable debug cookiecutter logging for deep debug

src/briefcase/commands/base.py

@@ -13,6 +13,7 @@
 from pathlib import Path
 
 from cookiecutter import exceptions as cookiecutter_exceptions
+from cookiecutter.log import configure_logger as configure_cookiecutter_logger
 from cookiecutter.repository import is_repo_url
 from platformdirs import PlatformDirs
 
@@ -911,6 +912,8 @@ def generate_template(self, template, branch, output_path, extra_context):
             template=template, branch=branch
         )
 
+        configure_cookiecutter_logger("DEBUG" if self.logger.is_deep_debug else "INFO")
+
         try:
             # Unroll the template
             self.tools.cookiecutter(

tests/commands/base/test_cookiecutter_logging.py

@@ -0,0 +1,37 @@
+import logging
+
+import pytest
+
+cookiecutter_logger = logging.getLogger("cookiecutter")
+
+
+@pytest.fixture
+def base_command(base_command):
+    # Mock actual templating commands as no-ops
+    base_command.update_cookiecutter_cache = lambda *a, **kw: None
+    base_command.tools.cookiecutter = lambda *a, **kw: None
+    return base_command
+
+
+@pytest.mark.parametrize(
+    "verbosity, log_level",
+    [
+        (0, logging.INFO),
+        (1, logging.INFO),
+        (2, logging.DEBUG),
+    ],
+)
+def test_cookiecutter_logging_config(base_command, verbosity, log_level):
+    """The loggers for cookiecutter are configured as expected."""
+    base_command.logger.verbosity = verbosity
+
+    base_command.generate_template(
+        template="", branch="", output_path="", extra_context={}
+    )
+    # call multiple times to ensure only 1 handler ever exists
+    base_command.generate_template(
+        template="", branch="", output_path="", extra_context={}
+    )
+
+    assert len(cookiecutter_logger.handlers) == 1
+    assert cookiecutter_logger.handlers[0].level == log_level