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Python packaging in declarative way (wrapping pbr to make it flexible)

Project description

Rationale

Creating python packages is routine operation that involves a lot of actions that could be automated. Although there are petty good tools like pbr for that purpose, they miss some features and lack flexibility by trying to enforce some strongly opinionated decisions upon you. PacKit tries to solve this by providing a simple, convenient, and flexible way to create and build packages while aiming for following goals:

  • simple declarative way to configure your package through setup.cfg following distutils2 setup.cfg syntax
  • reasonable defaults
  • open for extension

Overview

PacKit is wrapper around pbr though it only uses it for interaction with setuptools/distutils through simplified interface. None of pbr functions are exposed but instead PacKit provides its own interface.

Available facilities

Here’s a brief overview of currently implemented facilities and the list will be extended as new ones will be added.

  • auto-version - set package version depending on selected versioning strategy.
  • auto-description - set package long description
  • auto-license - include license file into distribution
  • auto-dependencies - populate install_requires and test_requires from requirement files
  • auto-packages - discover packages to include in distribution.
  • auto-extra-meta - add useful options to the metadata config section
  • auto-package-data - include all files tracked by git from package dirs only.
  • auto-tests - make python setup.py test run tests with tox or pytest (depending on tox.ini presence).

On top of that PacKit forces easy_install to honor following PIP’s fetch directives:

  • index_url
  • find_links

Planned facilities

  • auto-plate - integration with platter
  • auto-license - fill out license information
  • auto-pep8 - produce style-check reports
  • auto-docs - API docs generation
  • auto-clean - configurable clean jobs
  • auto-coverage (?) - produce coverage reports while running tests

If you don’t see desired facilities or have cool features in mind feel free to contact us and tell about your ideas.

Usage

Create a setup.py in your project dir:

from setuptools import setup

setup(setup_requires='packit', packit=True)

That was the first and the last time you touched that file for your project.

Now let’s create a setup.cfg that you will use in order to configure your package:

[metadata]
name = cool-package

And… if you’re not doing anything tricky in your package then that’s enough! And if you do, take a look at the section below.

Facilities

Currently all available facilities are enabled by default. Though you can easily turn them off by using facilities section in your setup.cfg:

[facilities]
auto-version = 0
auto-dependencies = f
auto-packages = false
auto-package-data = n
auto-tests = no

If facility is explicitly disabled it won’t be used even if facility-specific configuration section is present.

Facility-specific defaults and configuration options described below.

auto-version

When enabled, auto-version will generate and set package version according to selected versioning strategy.

Versioning strategy can be selected using type field under auto-version section within setup.cfg. The default is:

[auto-version]
type = git-pep440
output = src/templates/version.html

You can use output field to ask PacKit to write generated version value into specified filename. The specified filename do not need to exist but the parent directories should exist. Provided path should always use forward slashes.

git-pep440

Generate PEP440-compliant version from git tags. It’s expected that you are using git tags that follow public version identifier description and git-pep440 will just append number of commits since tag was applied to your tag value (the N in public version identifier description).

If number of commits since tag equal to 0 (your building the tagged version) the N value won’t be appended. Otherwise, it will be appended and local version identifier equal to first 7 chars of commit hash will be also added.

Please note: you must create an annotated tag, otherwise it will be ignored.

Example: 1. <git tag -a 1.2.3.dev -m “dev release 1.2.3.dev”> -> version is 1.2.3.dev

  1. <git commit> -> version is 1.2.3.dev.post1
  2. <git commit> -> version is 1.2.3.dev.post2
  3. <git tag -a 1.2.3.a -m “Release 1.2.3.a”> -> version is 1.2.3.a
  4. <git commit> -> version is 1.2.3.a.post1
  5. <git tag -a 1.2.3 -m “Release 1.2.3”> -> version is 1.2.3
  6. <git commit> -> version is 1.2.3.post1
  7. <git commit> -> version is 1.2.3.post2

fixed

Use value specified in value (it’s required when this strategy is used) under auto-version section in setup.cfg:

[auto-version]
type = fixed
value = 3.3

file

Read a line using UTF-8 encoding from the file specified in value (it’s required when this strategy is used) under auto-version section in setup.cfg, strip it and use as a version.

[auto-version]
type = file
value = VERSION.txt

shell

Execute command specified in value (it’s required when this strategy is used) under auto-version section in setup.cfg, read a line from stdout, strip it and use as a version

composite

The most advanced version strategy designed for special cases. It allows you to generate complex version values based on other version strategies. The usage is pretty simple though:

[auto-version]
type = composite
value = {foo}.{bar}+{git}
output = main.version

[auto-version:foo]
type = fixed
value = 42
output = 1st.version

[auto-version:bar]
type = shell
value = echo $RANDOM

[auto-version:git]
type = git-pep440
output = 3rd.version

The value field in composite version strategy should be a valid string format expression.

Please note that output directives used here only for reference (to show that they can be used anywhere) and are not required.

It’s OK to define ‘extra’ version components and not use them but it’s an error to not define any of components mentioned in composite version template.

auto-description

When enabled will fill out long_description for package from a readme.

The readme file name could be specified with file field under auto-description section.

If no file name provided, it will be discovered automatically by trying following list of files:

  • README
  • readme
  • CHANGELOG
  • changelog

Each of these files will be tried with following extensions:

  • <without extension>
  • .md
  • .markdown
  • .mkdn
  • .text
  • .rst
  • .txt

The readme file will be included in the package data.

auto-license

When enabled will include the license file into the distribution.

The license file name could be specified by the file field within auto-license section.

If license file name is not provided the facility will try to discover it in the current dir trying following file names:

  • LICENSE
  • license

Each of these files will be tried with following extensions:

  • <without extension>
  • .md
  • .markdown
  • .mkdn
  • .text
  • .rst
  • .txt

auto-dependencies

When enabled will fill install_requires and test_requires from requirement files.

Requirement files could be specified by install and test fields under the auto-dependencies section of the setup.cfg.

If requirements file names not provided then the facility will try to discover them automatically.

For installation requirements following paths will be tried:

  • requires
  • requirements
  • requirements/prod
  • requirements/release
  • requirements/install
  • requirements/main
  • requirements/base

For testing requirements following paths will be tried:

  • test-requires
  • test_requires
  • test-requirements
  • test_requirements
  • requirements_test
  • requirements-test
  • requirements/test

For each path following extensions will be tried

  • <without extension>
  • .pip
  • .txt

Once a file is found, PacKit stops looking for more files.

You can use vcs project urls and/or archive urls/paths as described in pip usage - they will be split in dependency links and package names during package creation and will be properly handled by pip/easyinstall during installation. Remember that you can also make “includes” relationships between requirements.txt files by including a line like -r other-requires-file.txt.

auto-packages

When enabled and no packages provided in setup.cfg through packages option under files section will try to automatically find out all packages in current dir recursively.

It operates using exclude and include values that can be specified under auto-packages section within setup.cfg.

If exclude not provided the following defaults will be used: test, docs, .tox and env.

If include not provided, auto-packages will try the following steps in order to generate it:

  1. If packages_root value provided under files section in setup.cfg, it will be used.
  2. Otherwise the current working dir will be scanned for any python packages (dirs with __init__.py) while honoring exclude value. This packages also will be included into the resulting list of packages.

Once include value is determined, the resulting packages list will be generated using following algorithm:

for path in include:
    found_packages |= set(find_packages(path, exclude))

auto-extra-meta

When enabled, adds a number of additional options to ‘metadata’ section.

Right now, only 1 extra option supported:

  • is_pure - allows you to override ‘purity’ flag for distribution, i.e. you can explicitly say whether your distribution is platform-specific or no.

auto-package-data

When enabled:

  1. If the everything option under the auto-package-data section is set to true, behaves like setuptools-git. Otherwise, includes all files only from packages’ dirs tracked by git to distribution.
  2. Allows you to specify extra files to be included in distribution in setup.cfg using extra_files under files section like:
  3. If manual option under auto-package-data section is set to true - includes only files from extra_files option in files section
[files]
extra_files =
  LICENSE.txt
  hints.txt
  some/stuff/lib.so
  1. Allows you to use glob syntax (including globstar) in data-files, extra_files and scripts

auto-tests

Has no additional configuration options [yet].

When enabled, the python setup.py test is equal to running:

  • tox if tox.ini is present
  • pytest with pytest-gitignore and teamcity-messages plugins enabled by default otherwise (if you need any other plugins just add them to test requirements) and activate them with additional options (see below)

The facility automatically downloads underlying test framework and install it - you don’t need to worry about it.

You can pass additional parameters to the underlying test framework with ‘-a’ or ‘–additional-test-args=’.

Further Development

  • Add tests
  • Improve docs
  • More configuration options for existing facilities
  • New facilities
  • Allow extension through entry points

Project details


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