Configuration options

Briefcase is a PEP518-compliant build tool. It uses a pyproject.toml file, in the root directory of your project, to provide build instructions for the packaged file.

If you have an application called “My App”, with source code in the src/myapp directory, the simplest possible pyproject.toml Briefcase configuration file would be:

[tool.briefcase]
project_name = "My Project"
bundle = "com.example"
version = "0.1"

[tool.briefcase.app.myapp]
formal_name = "My App"
description = "My first Briefcase App"
sources = ['src/myapp']

The configuration sections are tool specific, and start with the prefix tool.briefcase.

The location of the pyproject.toml file is treated as the root of the project definition. Briefcase should be invoked in a directory that contains a pyproject.toml file, and all relative file path references contained in the pyproject.toml file will be interpreted relative to the directory that contains the pyproject.toml file.

Configuration sections

A project that is packaged by Briefcase can declare multiple applications. Each application is a distributable product of the build process. A simple project will only have a single application. However, a complex project may contain multiple applications with shared code.

Each setting can be specified:

  • At the level of an output format (e.g., settings specific to building macOS DMGs);
  • At the level of an platform for an app (e.g., macOS specific settings);
  • At the level of an individual app; or
  • Globally, for all applications in the project.

When building an application in a particular output format, Briefcase will look for settings in the same order. For example, if you’re building a macOS DMG for an application called myapp, Briefcase will look for macOS DMG settings for myapp, then for macOS settings for myapp, then for myapp settings, then for project-level settings.

[tool.briefcase]

The base [tool.briefcase] section declares settings that project specific, or are are common to all applications in this repository.

[tool.briefcase.app.<app name>]

Configuration options for a specific application.

<app name> must adhere to a valid Python distribution name as specified in PEP508.

[tool.briefcase.app.<app name>.<platform>]

Configuration options for an application that are platform specific. The platform must match a name for a platform supported by Briefcase (e.g., macOS or windows). A list of the platforms supported by Briefcase can be obtained by running briefcase -h, and inspecting the help for the platform option

[tool.briefcase.app.<app name>.<platform>.<output format>]

Configuration options that are specific to a particular output format. For example, macOS applications can be generated in app or dmg format.

Project configuration

Required values

bundle

A reverse-domain name that can be used to identify resources for the application e.g., com.example. The bundle identifier will be combined with the app name to produce a unique application identifier - e.g., if the bundle identifier is com.example and the app name is myapp`, the application will be identified as ``com.example.myapp.

project_name

The project is the collection of all applications that are described by the briefcase configuration. For projects with a single app, this may be the same as the formal name of the solitary packaged app.

version

A PEP440 compliant version string.

Examples of valid version strings:

  • 1.0
  • 1.2.3
  • 1.2.3.dev4 - A development release
  • 1.2.3a5 - An alpha pre-release
  • 1.2.3b6 - A Beta pre-release
  • 1.2.3rc7 - A release candidate
  • 1.2.3.post8 - A post-release

Optional values

author

The person or organization responsible for the project.

author_email

The contact email address for the person or organization responsible for the project.

url

A URL where more details about the project can be found.

Application configuration

Required

description

A short, one-line description of the purpose of the application.

sources

A list of paths, relative to the pyproject.toml file, where source code for the application can be found. The contents of any named files or folders will be copied into the application bundle. Parent directories in any named path will not be included. For example, if you specify src/myapp as a source, the contents of the myapp folder will be copied into the application bundle; the src directory will not be reproduced.

Unlike most other keys in a configuration file, sources is cumlative setting. If an application defines sources at the global level, application level, and platform level, the final set of sources will be the concatenation of sources from all levels, starting from least to most specific.

Optional values

author

The person or organization responsible for the application.

author_email

The contact email address for the person or organization responsible for the application.

formal_name

The application name as it should be displayed to humans. This name may contain capitalization and punctuation. If it is not specified, the name will be used.

icon

A path, relative to the directory where the pyproject.toml file is located, to an image to use as the icon for the application. The path should exclude the extension; Briefcase will append a platform appropriate extension when configuring the application. For example, an icon specification of icon = "resources/icon" will use resources/icon.icns on macOS, and resources/icon.ico on Windows.

Some platforms require multiple icons, at different sizes; these will be handled by appending the required size to the provided icon name. For example, iOS requires multiple icon sizes (ranging from 20px to 1024px); Briefcase will look for resources/icon-20.png, resources/icon-1024.png, and so on. The sizes that are required are determined by the platform template.

installer_icon

A path, relative to the directory where the pyproject.toml file is located, to an image to use as the icon for the installer. As with icon, the path should exclude the extension, and a platform-appropriate extension will be appended when the application is built.

installer_background

A path, relative to the directory where the pyproject.toml file is located, to an image to use as the background for the installer. As with splash, the path should exclude the extension, and a platform-appropriate extension will be appended when the application is built.

requires

A list of packages that must be packaged with this application.

Unlike most other keys in a configuration file, requires is cumlative setting. If an application defines requirements at the global level, application level, and platform level, the final set of requirements will be the concatenation of requirements from all levels, starting from least to most specific.

splash

A path, relative to the directory where the pyproject.toml file is located, to an image to use as the splash screen for the application. The path should exclude the extension; Briefcase will append a platform appropriate extension when configuring the application.

Some platforms require multiple splash images, at different sizes; these will be handled by appending the required size to the provided icon name. For example, iOS requires multiple splash screens, (including 1024x768px, 768x1024px, 2048x1536px, and more); Briefcase will look for resources/splash-1024x768.png, resources/splash-768x1024.png, resources/splash-2048x1536.png, and so on. The sizes that are required are determined by the platform template.

Some platforms also require different variants (e.g., both portrait and landscape splash screens). These variants can be specified by qualifying the splash specification:

splash.portrait = “resource/portrait-splash” splash.landscape = “resource/landscape-splash”

If the platform output format does not use a splash screen, the splash setting is ignored. If the platform requires both variants and sizes, the handling will be combined.

support_package

A file path or URL pointing at a tarball containing a Python support package. (i.e., a precompiled, embeddable Python interpreter for the platform)

If this setting is not provided, Briefcase will use the default support package for the platform.

support_revision

The specific revision of a support package that should be used. By default, Briefcase will always use the most recently released support package; if you specify a support revision, the support package will be pinned to that version for your app.

If the support package is a URL, a query argument of revision=<support_revision> will be added to the support package URL when it is downloaded.

If the support package is a file path, this argument is ignored.

template

A file path or URL pointing at a cookiecutter template for the output format.

If this setting is not provided, Briefcase will use a default template for the output format and Python version.

url

A URL where more details about the application can be found.

Document types

Applications in a project can register themselves with the operating system as handlers for specific document types by adding a document_type configuration section for each document type the application can support. This section follows the format:

[tool.briefcase.app.<app name>.document_type.<extension>]

or, for a platform specific definition:

[tool.briefcase.app.<app name>.<platform>.document_type.<extension>]

where extension is the file extension to register. For example, myapp could register as a handler for PNG image files by defining the configuration section [tool.briefcase.app.myapp.document_type.png].

The document type declaration requires the following settings:

description

A short, one-line description of the document format.

icon

A path, relative to the directory where the pyproject.toml file is located, to an image for an icon to register for use with documents of this type. The path should exclude the extension; Briefcase will append a platform appropriate extension when configuring the applcation. For example, an icon specification of:

icon = "resources/icon"

will use resources/icon.icns on macOS, and resources/icon.ico on Windows.

Some platforms also require different variants (e.g., both square and round icons). These variants can be specified by qualifying the icon specification:

icon.round = “resource/round-icon” icon.square = “resource/square-icon”

Some platforms require multiple icons, at different sizes; these will be handled by appending the required size to the provided icon name. For example, iOS requires multiple icon sizes (ranging from 20px to 1024px); Briefcase will look for resources/icon-20.png, resources/icon-1024.png, and so on. The sizes that are required are determined by the platform template.

If a platform requires both different sizes and variants, the variant handling and size handling will be combined. For example, Android requires round and square icons, in sizes ranging from 48px to 192px; Briefcase will look for resource/round-icon-42.png, resource/square-icon-42.png, resource/round-icon-192.png, and so on.

url

A URL for help related to the document format.