Map conda verbosity level to matching libmamba logging level

conda_libmamba_solver/mamba_utils.py

@@ -68,15 +68,20 @@ def init_libmamba_context(
     if libmamba_context.output_params.json:
         libmambapy.cancel_json_output(libmamba_context)
     libmamba_context.output_params.quiet = context.quiet
-    libmamba_context.output_params.verbosity = context.verbosity
+    verbosity = context.verbosity
+    # libmambapy only respects 4 log levels. If conda provides
+    # a higher verbosity, set the highest logging verbosity level.
+    if verbosity > 4:
+        verbosity = 4
+    libmamba_context.output_params.verbosity = verbosity
     libmamba_context.set_log_level(
         {
             4: libmambapy.LogLevel.TRACE,
             3: libmambapy.LogLevel.DEBUG,
             2: libmambapy.LogLevel.INFO,
             1: libmambapy.LogLevel.WARNING,
             0: libmambapy.LogLevel.ERROR,
-        }[context.verbosity]
+        }[verbosity]
     )
 
     # Prefix params

news/949-map-verbosity

@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Fix error when the verbosity level from conda is set higher than 4. (#948 via #949)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>

tests/test_mamba_utils.py

@@ -0,0 +1,27 @@
+# Copyright (C) 2022 Anaconda, Inc
+# Copyright (C) 2023 conda
+# SPDX-License-Identifier: BSD-3-Clause
+from __future__ import annotations
+
+import pytest
+from conda.base.context import reset_context
+
+from conda_libmamba_solver.mamba_utils import init_libmamba_context
+
+
+@pytest.mark.parametrize(
+    "verbosity,expected_verbosity",
+    (
+        pytest.param("0", 0, id="error level logging"),
+        pytest.param("1", 1, id="warning level logging"),
+        pytest.param("2", 2, id="info level logging"),
+        pytest.param("3", 3, id="debug level logging"),
+        pytest.param("4", 4, id="trace level logging"),
+        pytest.param("5", 4, id="large logging level"),
+    ),
+)
+def test_valid_verbosity(monkeypatch: pytest.MonkeyPatch, verbosity: str, expected_verbosity: int):
+    monkeypatch.setenv("CONDA_VERBOSITY", verbosity)
+    reset_context()
+    libmamba_context = init_libmamba_context()
+    assert libmamba_context.output_params.verbosity == expected_verbosity