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@jezdez jezdez released this 27 Sep 19:49
· 1 commit to 23.9.x since this release
23.9.0
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Special announcement

This is an announcement about an important and positive future change in conda's functionality:

  • We will change the default solver of conda to conda-libmamba-solver in a special 23.10.0 release in the near future!

  • You can already benefit from it today by configuring your conda installation to use it (e.g. by running conda config --set solver libmamba).

  • The current "classic" solver is based on pycosat/Picosat and will remain part of conda for the forseeable future, a fallback is possible and available (see below).

Plan to change the default solver

Here is our updated plan to change the default solver, to better follow CEP 8 and reduce the potential impact on conda users:

  • The upcoming, special 23.10.0 release will be dedicated to the switch of the default solver to libmamba.
  • Users will be able to opt out of the libmamba solver and use the classic solver instead, by using one of these options:
    • the --solver=classic command line option,
    • the CONDA_SOLVER=classic environment variable or
    • running conda config --set solver classic.
  • All development of conda-libmamba-solver plugin happens in the conda-libmamba-solver repo, including issue tracking.
  • The documentation of the conda-libmamba-solver plugin can be found on conda.github.io/conda-libmamba-solver.

For more information about the conda-libmamba-solver rollout plan, please also see our blog post from earlier this year.

Context

A "solver" is the core component of most package managers; it calculates which dependencies (and which version of those dependencies) to install when a user requests to install a package from a package repository. To address growth-related challenges within the conda ecosystem, the conda maintainers, alongside partners Anaconda, Quansight and QuantStack, introduced a new conda dependency solver based on the Mamba project in December 2022.

Since July 2023, that conda-libmamba-solver plugin has been included in and automatically installed with all major conda ecosystem installers (miniforge, miniconda, mambaforge and Anaconda Distribution), with the default solver configuration unchanged.

Enhancements

  • Improve speed of fish shell initialization. (#12811)
  • Directly suppress use of binstar (conda) token when fetching trust metadata. (#12889)
  • Add a new "auth handler" plugin hook for conda. (#12911)
  • Lock index cache metadata by default. Added --no-lock option in case of problems, should not be necessary. Older --experimental=lock no longer has an effect. (#12920)
  • Add context.register_envs option to control whether to register environments in ~/.conda/environments.txt when they are created. Defaults to true. (#12924)
  • Inject a new detailed output verbosity level (i.e., the old debug level -vv is now -vvv). (#12985, #12977, #12420, #13036)
  • Add support for truststore to the ssl_verify config option, enabling conda to use the operating system certificate store (requires Python 3.10 or later). (#13075 and #13149)
  • Add emscripten-wasm32 and wasi-wasm32 platforms to known platforms. (#13095)
  • Adds the py.typed marker file to the conda package for compliance with PEP-561. (#13107)
  • Import boto3 only when S3 channels are used, saving startup time. (#12914)

Bug fixes

  • When using pip dependencies with conda env create, check the directory permissions before writing to disk. (#11610)
  • Hide InsecureRequestWarning for JLAP when CONDA_SSL_VERIFY=false, matching non-JLAP behavior. (#12731)
  • Disallow ability to create a conda environment with a colon in the prefix. (#13044)
  • Fix AttributeError logging response with nonexistent request when using JLAP with file:/// URIs. (#12966)
  • Do not show progress bars in non-interactive runs for cleaner logs. (#12982)
  • Fix S3 bucket name. (#12989)
  • Default --json and --debug to NULL so as to not override CONDA_JSON and CONDA_DEBUG environment variables. (#12987)
  • XonshActivator now uses source-bash in non-interactive mode to avoid side-effects from interactively loaded RC files. (#13012)
  • Fix conda remove --all --json output. (#13019)
  • Update test data to stop triggering security scanners' false-positives. (#13034)
  • Fix performance regression of basic commands (e.g., conda info) on WSL. (#13035)
  • Configure conda to ignore "Retry-After" header to avoid the scenarios when this value is very large and causes conda to hang indefinitely. (#13050)
  • Treat JSONDecodeError on repodata.info.json as a warning, equivalent to a missing repodata.info.json. (#13056)
  • Fix sorting error for conda config --show-sources --json. (#13076)
  • Catch OSError in find_commands to account for incorrect PATH entries on Windows. (#13125)
  • Catch a NotWritableError when trying to find the first writable package cache dir. (#9609)
  • conda env update --prune uses only the specs coming from environment.yml file and ignores the history specs. (#9614)

Deprecations

  • Removed conda.another_unicode(). (#12948)
  • Removed conda._vendor.toolz. (#12948, #13141)
  • Removed conda._vendor.tqdm. (#12948)
  • Removed conda.auxlib.decorators.memoized decorator. (#12948)
  • Removed conda.base.context.Context.experimental_solver. (#12948)
  • Removed conda.base.context.Context.conda_private. (#12948)
  • Removed conda.base.context.Context.cuda_version. (#12948)
  • Removed conda.base.context.get_prefix(). (#12948)
  • Removed conda.cli.common.ensure_name_or_prefix(). (#12948)
  • Removed --experimental-solver command line option. (#12948)
  • Removed conda.common.cuda module. (#12948)
  • Removed conda.common.path.explode_directories(already_split). (#12948)
  • Removed conda.common.url.escape_channel_url(). (#12948)
  • Removed conda.core.index.check_whitelist(). (#12948)
  • Removed conda.core.solve._get_solver_class(). (#12948)
  • Removed conda.core.subdir_data.read_mod_and_etag(). (#12948)
  • Removed conda.gateways.repodata.RepodataState.load(). (#12948)
  • Removed conda.gateways.repodata.RepodataState.save(). (#12948)
  • Removed conda.lock module. (#12948)
  • Removed conda_env.cli.common.stdout_json(). (#12948)
  • Removed conda_env.cli.common.get_prefix(). (#12948)
  • Removed conda_env.cli.common.find_prefix_name(). (#12948)
  • Remove import of deprecated cgi module by deprecating ftp STOR support. (#13013)
  • Require boto3 for S3 support and drop support for the older boto as it doesn't support our minimum required version of Python. (#13112)
  • Reduce startup delay from deprecations module by using sys._getframe() instead of inspect.stack(). (#12919)

Other

  • Use Ruff linter in pre-commit configuration (#12279)
  • Remove unused cache_path arguments from RepoInterface/JlapRepoInterface; replaced by cache object. (#12927)

Contributors

Full Changelog: 23.7.4...23.9.0

Contributors

jezdez, zeehio, and 21 other contributors
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