setuptools_scm ============== ``setuptools_scm`` extracts Python package versions from ``git`` or ``hg`` metadata instead of declaring them as the version argument or in a SCM managed file. Additionally ``setuptools_scm`` provides setuptools with a list of files that are managed by the SCM (i.e. it automatically adds all of the SCM-managed files to the sdist). Unwanted files must be excluded by discarding them via ``MANIFEST.in``. ``setuptools_scm`` supports the following scm out of the box: * git * mercurial .. image:: https://github.com/pypa/setuptools_scm/workflows/python%20tests+artifacts+release/badge.svg :target: https://github.com/pypa/setuptools_scm/actions .. image:: https://tidelift.com/badges/package/pypi/setuptools-scm :target: https://tidelift.com/subscription/pkg/pypi-setuptools-scm?utm_source=pypi-setuptools-scm&utm_medium=readme ``pyproject.toml`` usage ------------------------ The preferred way to configure ``setuptools_scm`` is to author settings in a ``tool.setuptools_scm`` section of ``pyproject.toml``. This feature requires Setuptools 42 or later, released in Nov, 2019. If your project needs to support build from sdist on older versions of Setuptools, you will need to also implement the ``setup.py usage`` for those legacy environments. First, ensure that ``setuptools_scm`` is present during the project's built step by specifying it as one of the build requirements. .. code:: toml # pyproject.toml [build-system] requires = ["setuptools>=45", "setuptools_scm[toml]>=6.2"] That will be sufficient to require ``setuptools_scm`` for projects that support PEP 518 (`pip `_ and `pep517 `_). Many tools, especially those that invoke ``setup.py`` for any reason, may continue to rely on ``setup_requires``. For maximum compatibility with those uses, consider also including a ``setup_requires`` directive (described below in ``setup.py usage`` and ``setup.cfg``). To enable version inference, you need to set the version dynamically in the ``project`` section of ``pyproject.toml``: .. code:: toml # pyproject.toml [project] # version = "0.0.1" # Remove any existing version parameter. dynamic = ["version"] Then add this section to your ``pyproject.toml``: .. code:: toml # pyproject.toml [tool.setuptools_scm] Including this section is comparable to supplying ``use_scm_version=True`` in ``setup.py``. Additionally, include arbitrary keyword arguments in that section to be supplied to ``get_version()``. For example: .. code:: toml # pyproject.toml [tool.setuptools_scm] write_to = "pkg/_version.py" Where ``pkg`` is the name of your package. If you need to confirm which version string is being generated or debug the configuration, you can install `setuptools-scm `_ directly in your working environment and run: .. code-block:: shell $ python -m setuptools_scm # To explore other options, try: $ python -m setuptools_scm --help ``setup.py`` usage (deprecated) ------------------------------- .. warning:: ``setup_requires`` has been deprecated in favor of ``pyproject.toml`` The following settings are considered legacy behavior and superseded by the ``pyproject.toml`` usage, but for maximal compatibility, projects may also supply the configuration in this older form. To use ``setuptools_scm`` just modify your project's ``setup.py`` file like this: * Add ``setuptools_scm`` to the ``setup_requires`` parameter. * Add the ``use_scm_version`` parameter and set it to ``True``. For example: .. code:: python from setuptools import setup setup( ..., use_scm_version=True, setup_requires=['setuptools_scm'], ..., ) Arguments to ``get_version()`` (see below) may be passed as a dictionary to ``use_scm_version``. For example: .. code:: python from setuptools import setup setup( ..., use_scm_version = { "root": "..", "relative_to": __file__, "local_scheme": "node-and-timestamp" }, setup_requires=['setuptools_scm'], ..., ) You can confirm the version number locally via ``setup.py``: .. code-block:: shell $ python setup.py --version .. note:: If you see unusual version numbers for packages but ``python setup.py --version`` reports the expected version number, ensure ``[egg_info]`` is not defined in ``setup.cfg``. ``setup.cfg`` usage (deprecated) ------------------------------------ as ``setup_requires`` is deprecated in favour of ``pyproject.toml`` usage in ``setup.cfg`` is considered deprecated, please use ``pyproject.toml`` whenever possible. Programmatic usage ------------------ In order to use ``setuptools_scm`` from code that is one directory deeper than the project's root, you can use: .. code:: python from setuptools_scm import get_version version = get_version(root='..', relative_to=__file__) See `setup.py Usage (deprecated)`_ above for how to use this within ``setup.py``. Retrieving package version at runtime ------------------------------------- If you have opted not to hardcode the version number inside the package, you can retrieve it at runtime from PEP-0566_ metadata using ``importlib.metadata`` from the standard library (added in Python 3.8) or the `importlib_metadata`_ backport: .. code:: python from importlib.metadata import version, PackageNotFoundError try: __version__ = version("package-name") except PackageNotFoundError: # package is not installed pass Alternatively, you can use ``pkg_resources`` which is included in ``setuptools`` (but has a significant runtime cost): .. code:: python from pkg_resources import get_distribution, DistributionNotFound try: __version__ = get_distribution("package-name").version except DistributionNotFound: # package is not installed pass However, this does place a runtime dependency on ``setuptools`` and can add up to a few 100ms overhead for the package import time. .. _PEP-0566: https://www.python.org/dev/peps/pep-0566/ .. _importlib_metadata: https://pypi.org/project/importlib-metadata/ Usage from Sphinx ----------------- It is discouraged to use ``setuptools_scm`` from Sphinx itself, instead use ``importlib.metadata`` after editable/real installation: .. code:: python # contents of docs/conf.py from importlib.metadata import version release = version('myproject') # for example take major/minor version = '.'.join(release.split('.')[:2]) The underlying reason is, that services like *Read the Docs* sometimes change the working directory for good reasons and using the installed metadata prevents using needless volatile data there. Usage from Docker ----------------- By default, docker will not copy the ``.git`` folder into your container. Therefore, builds with version inference might fail. Consequently, you can use the following snippet to infer the version from the host os without copying the entire ``.git`` folder to your Dockerfile. .. code:: dockerfile RUN --mount=source=.git,target=.git,type=bind \ pip install --no-cache-dir -e . However, this build step introduces a dependency to the state of your local .git folder the build cache and triggers the long-running pip install process on every build. To optimize build caching, one can use an environment variable to pretend a pseudo version that is used to cache the results of the pip install process: .. code:: dockerfile FROM python COPY pyproject.toml ARG PSEUDO_VERSION=1 RUN SETUPTOOLS_SCM_PRETEND_VERSION=${PSEUDO_VERSION} pip install -e .[test] RUN --mount=source=.git,target=.git,type=bind pip install -e . Note that running this Dockerfile requires docker with BuildKit enabled `[docs] `_. To avoid BuildKit and mounting of the .git folder altogether, one can also pass the desired version as a build argument. Note that ``SETUPTOOLS_SCM_PRETEND_VERSION_FOR_${UPPERCASED_DIST_NAME}`` is preferred over ``SETUPTOOLS_SCM_PRETEND_VERSION``. Default versioning scheme ------------------------- In the standard configuration ``setuptools_scm`` takes a look at three things: 1. latest tag (with a version number) 2. the distance to this tag (e.g. number of revisions since latest tag) 3. workdir state (e.g. uncommitted changes since latest tag) and uses roughly the following logic to render the version: no distance and clean: ``{tag}`` distance and clean: ``{next_version}.dev{distance}+{scm letter}{revision hash}`` no distance and not clean: ``{tag}+dYYYYMMDD`` distance and not clean: ``{next_version}.dev{distance}+{scm letter}{revision hash}.dYYYYMMDD`` The next version is calculated by adding ``1`` to the last numeric component of the tag. For Git projects, the version relies on `git describe `_, so you will see an additional ``g`` prepended to the ``{revision hash}``. Semantic Versioning (SemVer) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Due to the default behavior it's necessary to always include a patch version (the ``3`` in ``1.2.3``), or else the automatic guessing will increment the wrong part of the SemVer (e.g. tag ``2.0`` results in ``2.1.devX`` instead of ``2.0.1.devX``). So please make sure to tag accordingly. .. note:: Future versions of ``setuptools_scm`` will switch to `SemVer `_ by default hiding the the old behavior as an configurable option. Builtin mechanisms for obtaining version numbers ------------------------------------------------ 1. the SCM itself (git/hg) 2. ``.hg_archival`` files (mercurial archives) 3. ``.git_archival.txt`` files (git archives, see subsection below) 4. ``PKG-INFO`` Git archives ~~~~~~~~~~~~ Git archives are supported, but a few changes to your repository are required. Create a ``.git_archival.txt`` file in the root directory of your repository, and copy-paste this into it:: node: $Format:%H$ node-date: $Format:%cI$ describe-name: $Format:%(describe:tags=true,match=*[0-9]*)$ ref-names: $Format:%D$ Create the ``.gitattributes`` file in the root directory of your repository if it doesn't already exist, and copy-paste this into it:: .git_archival.txt export-subst Finally, don't forget to commit those two files:: git add .git_archival.txt .gitattributes && git commit Note that if you are creating a ``_version.py`` file, note that it should not be kept in version control. File finders hook makes most of MANIFEST.in unnecessary ------------------------------------------------------- ``setuptools_scm`` implements a `file_finders `_ entry point which returns all files tracked by your SCM. This eliminates the need for a manually constructed ``MANIFEST.in`` in most cases where this would be required when not using ``setuptools_scm``, namely: * To ensure all relevant files are packaged when running the ``sdist`` command. * When using `include_package_data `_ to include package data as part of the ``build`` or ``bdist_wheel``. ``MANIFEST.in`` may still be used: anything defined there overrides the hook. This is mostly useful to exclude files tracked in your SCM from packages, although in principle it can be used to explicitly include non-tracked files too. Configuration parameters ------------------------ In order to configure the way ``use_scm_version`` works you can provide a mapping with options instead of a boolean value. The currently supported configuration keys are: :root: Relative path to cwd, used for finding the SCM root; defaults to ``.`` :version_scheme: Configures how the local version number is constructed; either an entrypoint name or a callable. :local_scheme: Configures how the local component of the version is constructed; either an entrypoint name or a callable. :write_to: A path to a file that gets replaced with a file containing the current version. It is ideal for creating a ``_version.py`` file within the package, typically used to avoid using `pkg_resources.get_distribution` (which adds some overhead). .. warning:: Only files with :code:`.py` and :code:`.txt` extensions have builtin templates, for other file types it is necessary to provide :code:`write_to_template`. :write_to_template: A newstyle format string that is given the current version as the ``version`` keyword argument for formatting. :relative_to: A file from which the root can be resolved. Typically called by a script or module that is not in the root of the repository to point ``setuptools_scm`` at the root of the repository by supplying ``__file__``. :tag_regex: A Python regex string to extract the version part from any SCM tag. The regex needs to contain either a single match group, or a group named ``version``, that captures the actual version information. Defaults to the value of ``setuptools_scm.config.DEFAULT_TAG_REGEX`` (see `_config.py `_). :parentdir_prefix_version: If the normal methods for detecting the version (SCM version, sdist metadata) fail, and the parent directory name starts with ``parentdir_prefix_version``, then this prefix is stripped and the rest of the parent directory name is matched with ``tag_regex`` to get a version string. If this parameter is unset (the default), then this fallback is not used. This is intended to cover GitHub's "release tarballs", which extract into directories named ``projectname-tag/`` (in which case ``parentdir_prefix_version`` can be set e.g. to ``projectname-``). :fallback_version: A version string that will be used if no other method for detecting the version worked (e.g., when using a tarball with no metadata). If this is unset (the default), setuptools_scm will error if it fails to detect the version. :parse: A function that will be used instead of the discovered SCM for parsing the version. Use with caution, this is a function for advanced use, and you should be familiar with the ``setuptools_scm`` internals to use it. :git_describe_command: This command will be used instead the default ``git describe`` command. Use with caution, this is a function for advanced use, and you should be familiar with the ``setuptools_scm`` internals to use it. Defaults to the value set by ``setuptools_scm.git.DEFAULT_DESCRIBE`` (see `git.py `_). :normalize: A boolean flag indicating if the version string should be normalized. Defaults to ``True``. Setting this to ``False`` is equivalent to setting ``version_cls`` to ``setuptools_scm.version.NonNormalizedVersion`` :version_cls: An optional class used to parse, verify and possibly normalize the version string. Its constructor should receive a single string argument, and its ``str`` should return the normalized version string to use. This option can also receive a class qualified name as a string. This defaults to ``packaging.version.Version`` if available. If ``packaging`` is not installed, ``pkg_resources.packaging.version.Version`` is used. Note that it is known to modify git release candidate schemes. The ``setuptools_scm.NonNormalizedVersion`` convenience class is provided to disable the normalization step done by ``packaging.version.Version``. If this is used while ``setuptools_scm`` is integrated in a setuptools packaging process, the non-normalized version number will appear in all files (see ``write_to``) BUT note that setuptools will still normalize it to create the final distribution, so as to stay compliant with the python packaging standards. To use ``setuptools_scm`` in other Python code you can use the ``get_version`` function: .. code:: python from setuptools_scm import get_version my_version = get_version() It optionally accepts the keys of the ``use_scm_version`` parameter as keyword arguments. Example configuration in ``setup.py`` format: .. code:: python from setuptools import setup setup( use_scm_version={ 'write_to': '_version.py', 'write_to_template': '__version__ = "{version}"', 'tag_regex': r'^(?Pv)?(?P[^\+]+)(?P.*)?$', } ) Environment variables --------------------- :SETUPTOOLS_SCM_PRETEND_VERSION: when defined and not empty, its used as the primary source for the version number in which case it will be a unparsed string :SETUPTOOLS_SCM_PRETEND_VERSION_FOR_${UPPERCASED_DIST_NAME}: when defined and not empty, its used as the primary source for the version number in which case it will be a unparsed string it takes precedence over ``SETUPTOOLS_SCM_PRETEND_VERSION`` :SETUPTOOLS_SCM_DEBUG: when defined and not empty, a lot of debug information will be printed as part of ``setuptools_scm`` operating :SOURCE_DATE_EPOCH: when defined, used as the timestamp from which the ``node-and-date`` and ``node-and-timestamp`` local parts are derived, otherwise the current time is used (https://reproducible-builds.org/docs/source-date-epoch/) :SETUPTOOLS_SCM_IGNORE_VCS_ROOTS: when defined, a ``os.pathsep`` separated list of directory names to ignore for root finding Extending setuptools_scm ------------------------ ``setuptools_scm`` ships with a few ``setuptools`` entrypoints based hooks to extend its default capabilities. Adding a new SCM ~~~~~~~~~~~~~~~~ ``setuptools_scm`` provides two entrypoints for adding new SCMs: ``setuptools_scm.parse_scm`` A function used to parse the metadata of the current workdir using the name of the control directory/file of your SCM as the entrypoint's name. E.g. for the built-in entrypoint for git the entrypoint is named ``.git`` and references ``setuptools_scm.git:parse`` The return value MUST be a ``setuptools_scm.version.ScmVersion`` instance created by the function ``setuptools_scm.version:meta``. ``setuptools_scm.files_command`` Either a string containing a shell command that prints all SCM managed files in its current working directory or a callable, that given a pathname will return that list. Also use then name of your SCM control directory as name of the entrypoint. Version number construction ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``setuptools_scm.version_scheme`` Configures how the version number is constructed given a ``setuptools_scm.version.ScmVersion`` instance and should return a string representing the version. Available implementations: :guess-next-dev: Automatically guesses the next development version (default). Guesses the upcoming release by incrementing the pre-release segment if present, otherwise by incrementing the micro segment. Then appends :code:`.devN`. In case the tag ends with ``.dev0`` the version is not bumped and custom ``.devN`` versions will trigger a error. :post-release: generates post release versions (adds :code:`.postN`) :python-simplified-semver: Basic semantic versioning. Guesses the upcoming release by incrementing the minor segment and setting the micro segment to zero if the current branch contains the string ``'feature'``, otherwise by incrementing the micro version. Then appends :code:`.devN`. Not compatible with pre-releases. :release-branch-semver: Semantic versioning for projects with release branches. The same as ``guess-next-dev`` (incrementing the pre-release or micro segment) if on a release branch: a branch whose name (ignoring namespace) parses as a version that matches the most recent tag up to the minor segment. Otherwise if on a non-release branch, increments the minor segment and sets the micro segment to zero, then appends :code:`.devN`. :no-guess-dev: Does no next version guessing, just adds :code:`.post1.devN` ``setuptools_scm.local_scheme`` Configures how the local part of a version is rendered given a ``setuptools_scm.version.ScmVersion`` instance and should return a string representing the local version. Dates and times are in Coordinated Universal Time (UTC), because as part of the version, they should be location independent. Available implementations: :node-and-date: adds the node on dev versions and the date on dirty workdir (default) :node-and-timestamp: like ``node-and-date`` but with a timestamp of the form ``{:%Y%m%d%H%M%S}`` instead :dirty-tag: adds ``+dirty`` if the current workdir has changes :no-local-version: omits local version, useful e.g. because pypi does not support it Importing in ``setup.py`` ~~~~~~~~~~~~~~~~~~~~~~~~~ To support usage in ``setup.py`` passing a callable into ``use_scm_version`` is supported. Within that callable, ``setuptools_scm`` is available for import. The callable must return the configuration. .. code:: python # content of setup.py import setuptools def myversion(): from setuptools_scm.version import get_local_dirty_tag def clean_scheme(version): return get_local_dirty_tag(version) if version.dirty else '+clean' return {'local_scheme': clean_scheme} setup( ..., use_scm_version=myversion, ... ) Customizing Version Scheme with pyproject.toml ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ To support custom version schemes in pyproject.toml, you may specify your own function as an entrypoint for getting the version. .. code:: toml # pyproject.toml [tool.setuptools_scm] version_scheme = "myproject.my_file:myversion_func" .. code:: python # myproject/my_file def myversion_func(version: ScmVersion): from setuptools_scm.version import guess_next_version return version.format_next_version(guess_next_version, '{guessed}b{distance}') Note on testing non-installed versions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ While the general advice is to test against a installed version, some environments require a test prior to install, .. code:: $ python setup.py egg_info $ PYTHONPATH=$PWD:$PWD/src pytest Interaction with Enterprise Distributions ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Some enterprise distributions like RHEL7 and others ship rather old setuptools versions due to various release management details. In those case its typically possible to build by using a sdist against ``setuptools_scm<2.0``. As those old setuptools versions lack sensible types for versions, modern setuptools_scm is unable to support them sensibly. In case the project you need to build can not be patched to either use old setuptools_scm, its still possible to install a more recent version of setuptools in order to handle the build and/or install the package by using wheels or eggs. Code of Conduct --------------- Everyone interacting in the ``setuptools_scm`` project's codebases, issue trackers, chat rooms, and mailing lists is expected to follow the `PSF Code of Conduct`_. .. _PSF Code of Conduct: https://github.com/pypa/.github/blob/main/CODE_OF_CONDUCT.md Security Contact ================ To report a security vulnerability, please use the `Tidelift security contact `_. Tidelift will coordinate the fix and disclosure.