MAINT: Do not pre-suppose conda-forge [mamba]

CHANGES.rst

@@ -12,6 +12,7 @@ Bug Fixes
 - The ``mamba`` plugin works correctly for newer versions (>=1.5) of ``libmambapy`` (#1372)
 - The ``mamba`` plugin respects the ``MAMBARC`` environment if set, taking
   channels and channel priority from the file in the environment variable. (#1373)
+- ``conda-forge`` is no longer a default channel for ``mamba``. (#1373)
 - Fixed a bug where ``matrix`` requirements were dropped if an environment file was specified. (#1373)
 
 Other Changes and Additions

asv/plugins/mamba.py

@@ -55,8 +55,6 @@ def __init__(self, conf, python, requirements, tagged_env_vars):
         self._requirements = requirements
         self._mamba_channels = conf.conda_channels
         self._mamba_environment_file = None
-        if "conda-forge" not in conf.conda_channels and not os.getenv("MAMBARC"):
-            self._mamba_channels += ["conda-forge"]
 
         if conf.conda_environment_file == "IGNORE":
             log.debug("Skipping environment file due to conda_environment_file set to IGNORE")

docs/source/asv.conf.json.rst

@@ -285,9 +285,7 @@ the project being benchmarked may specify in its ``setup.py`` file.
        The ``mamba`` plugin will now take channels and channel priority from the
        ``MAMBARC`` environment variable if it is provided. e.g.
        ``MAMBARC=$HOME/.condarc asv run``. By default user ``.rc`` files are not
-       read to enforce isolation. The ``conda-forge`` channel is used as a
-       default only if neither an environment file nor the ``MAMBARC`` variable
-       is set.
+       read to enforce isolation.
 
 The ``env`` and ``env_nobuild`` dictionaries can be used to set also
 environment variables::