Build configuration¶

All build configuration is defined in the tool.hatch.build table.

Build targets are defined as sections within tool.hatch.build.targets:

[tool.hatch.build.targets.<TARGET_NAME>]

[build.targets.<TARGET_NAME>]

For each build target you may override any of the defaults set in the top-level tool.hatch.build table.

Build system¶

To be compatible with the broader Python packaging ecosystem, you must define the build system as follows:

[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

The version of hatchling defined here will be used to build all targets.

Hatchling is a PEP 517/PEP 660 compatible build system and is a dependency of Hatch itself.

File selection¶

VCS¶

By default, Hatch will respect the first .gitignore or .hgignore file found in your project's root directory or parent directories. Set ignore-vcs to true to disable this behavior:

[tool.hatch.build]
ignore-vcs = true

[build]
ignore-vcs = true

Patterns¶

You can set the include and exclude options to select exactly which files will be shipped in each build, with exclude taking precedence. Every entry represents a Git-style glob pattern.

For example, the following configuration:

[tool.hatch.build]
include = [
  "pkg/*.py",
  "/tests",
]
exclude = [
  "*.json",
  "pkg/_compat.py",
]

[build]
include = [
  "pkg/*.py",
  "/tests",
]
exclude = [
  "*.json",
  "pkg/_compat.py",
]

will exclude every file with a .json extension, and will include everything under a tests directory located at the root and every file with a .py extension that is directly under a pkg directory located at the root except for _compat.py.

Artifacts¶

If you want to include files that are ignored by your VCS, such as those that might be created by build hooks, you can use the artifacts option. This option is semantically equivalent to include.

Note that artifacts are not affected by the exclude option. Artifacts can be excluded by using more explicit paths or by using the ! negation operator. When using the ! operator, the negated pattern(s) must come after the more generic ones.

[tool.hatch.build]
artifacts = [
  "*.so",
  "*.dll",
  "!/foo/*.so",
]

[build]
artifacts = [
  "*.so",
  "*.dll",
  "!/foo/*.so",
]

Explicit selection¶

Generic¶

You can use the only-include option to prevent directory traversal starting at the project root and only select specific relative paths to directories or files. Using this option ignores any defined include patterns.

[tool.hatch.build.targets.wheel]
only-include = ["pkg", "tests/unit"]

[build.targets.wheel]
only-include = ["pkg", "tests/unit"]

Packages¶

The packages option is semantically equivalent to only-include (which takes precedence) except that the shipped path will be collapsed to only include the final component.

So for example, if you want to ship a package foo that is stored in a directory src you would do:

[tool.hatch.build.targets.wheel]
packages = ["src/foo"]

[build.targets.wheel]
packages = ["src/foo"]

Forced inclusion¶

The force-include option allows you to select specific files or directories from anywhere on the file system that should be included and map them to the desired relative distribution path.

For example, if there was a directory alongside the project root named artifacts containing a file named lib.so and a file named lib.h in your home directory, you could ship both files in a pkg directory with the following configuration:

[tool.hatch.build.force-include]
"../artifacts" = "pkg"
"~/lib.h" = "pkg/lib.h"

[build.force-include]
"../artifacts" = "pkg"
"~/lib.h" = "pkg/lib.h"

Default file selection¶

If no file selection options are provided, then what gets included is determined by each build target.

Excluding files outside packages¶

If you want to exclude non-artifact files that do not reside within a Python package, set only-packages to true:

[tool.hatch.build]
only-packages = true

[build]
only-packages = true

Rewriting paths¶

You can rewrite relative paths to directories with the sources option. For example, the following configuration:

[tool.hatch.build.sources]
"src/foo" = "bar"

[build.sources]
"src/foo" = "bar"

would distribute the file src/foo/file.ext as bar/file.ext.

If you want to remove path prefixes entirely, rather than setting each to an empty string, you can define sources as an array:

[tool.hatch.build]
sources = ["src"]

[build]
sources = ["src"]

The packages option itself relies on sources. Defining packages = ["src/foo"] for the wheel target is equivalent to the following:

[tool.hatch.build.targets.wheel]
only-include = ["src/foo"]
sources = ["src"]

[build.targets.wheel]
only-include = ["src/foo"]
sources = ["src"]

Performance¶

All encountered directories are traversed by default. To skip non-artifact directories that are excluded, set skip-excluded-dirs to true:

[tool.hatch.build]
skip-excluded-dirs = true

[build]
skip-excluded-dirs = true

Reproducible builds¶

By default, build targets will build in a reproducible manner provided that they support that behavior. To disable this, set reproducible to false:

[tool.hatch.build]
reproducible = false

[build]
reproducible = false

When enabled, the SOURCE_DATE_EPOCH environment variable will be used for all build timestamps. If not set, then Hatch will use an unchanging default value.

Output directory¶

When the output directory is not provided to the build command, the dist directory will be used by default. You can change the default to a different directory using a relative or absolute path like so:

[tool.hatch.build]
directory = "<PATH>"

[build]
directory = "<PATH>"

Dev mode¶

By default for dev mode environment installations or editable installs, the wheel target will determine which directories should be added to Python's search path based on the selected files.

If you want to override this detection or perhaps instruct other build targets as well, you can use the dev-mode-dirs option:

[tool.hatch.build]
dev-mode-dirs = ["."]

[build]
dev-mode-dirs = ["."]

If you don't want to add entire directories to Python's search path, you can enable a more targeted mechanism with the mutually exclusive dev-mode-exact option:

[tool.hatch.build]
dev-mode-exact = true

[build]
dev-mode-exact = true

Build targets¶

A build target can be provided by any builder plugin. There are three built-in build targets: wheel, sdist, and custom.

Dependencies¶

You can specify additional dependencies that will be installed in each build environment, such as for third party builders:

[tool.hatch.build.targets.your-target-name]
dependencies = [
  "your-builder-plugin"
]

[build.targets.your-target-name]
dependencies = [
  "your-builder-plugin"
]

You can also declare dependence on the project's runtime dependencies with the require-runtime-dependencies option:

[tool.hatch.build.targets.your-target-name]
require-runtime-dependencies = true

[build.targets.your-target-name]
require-runtime-dependencies = true

Versions¶

If a build target supports multiple build strategies or if there are major changes over time, you can specify exactly which versions you want to build using the versions option, which may be defined as either an array of strings or a comma-separated string:

[tool.hatch.build.targets.<TARGET_NAME>]
versions = [
  "v1",
  "beta-feature",
]

[build.targets.<TARGET_NAME>]
versions = [
  "v1",
  "beta-feature",
]

See the wheel target for a real world example.

Build hooks¶

A build hook defines code that will be executed at various stages of the build process and can be provided by any build hook plugin. There is one built-in build hook: custom.

Build hooks can be applied either globally:

[tool.hatch.build.hooks.<HOOK_NAME>]

[build.hooks.<HOOK_NAME>]

or to specific build targets:

[tool.hatch.build.targets.<TARGET_NAME>.hooks.<HOOK_NAME>]

[build.targets.<TARGET_NAME>.hooks.<HOOK_NAME>]

Dependencies¶

You can specify additional dependencies that will be installed in each build environment, such as for third party build hooks:

[tool.hatch.build.hooks.your-hook-name]
dependencies = [
  "your-build-hook-plugin"
]

[build.hooks.your-hook-name]
dependencies = [
  "your-build-hook-plugin"
]

You can also declare dependence on the project's runtime dependencies with the require-runtime-dependencies option:

[tool.hatch.build.hooks.your-hook-name]
require-runtime-dependencies = true

[build.hooks.your-hook-name]
require-runtime-dependencies = true

Order of execution¶

For each build target, build hooks execute in the order in which they are defined, starting with target-specific hooks.

As an example, for the following configuration:

[tool.hatch.build.hooks.hook3]
[tool.hatch.build.hooks.hook1]

[tool.hatch.build.targets.foo.hooks.hook2]

[build.hooks.hook3]
[build.hooks.hook1]

[build.targets.foo.hooks.hook2]

When target foo is built, build hook hook2 will be executed first, followed by hook3, and then finally hook1.

Conditional execution¶

If you want to disable a build hook by default and control its use by environment variables, you can do so by setting the enable-by-default option to false:

[tool.hatch.build.hooks.<HOOK_NAME>]
enable-by-default = false

[build.hooks.<HOOK_NAME>]
enable-by-default = false

Environment variables¶