Determines if the srcs of targets are added to their runfiles.
More specifically, the sources added to runfiles are the .py files in srcs. If precompiling is performed, it is the .py files that are kept according to precompile_source_retention.
Values:
auto: (default) Automatically decide the effective value; the current behavior is disabled.
disabled: Don’t add srcs to a target’s runfiles.
enabled: Add srcs to a target’s runfiles.
Added in version 0.37.0.
Deprecated since version 0.37.0: This is a transition flag and will be removed in a subsequent release.
Determines the default hermetic Python toolchain version. This can be set to one of the values that rules_python maintains.
Parses the value of the python_version and transforms it into a X.Y value.
config_settings to match Python versions
The name pattern is is_python_X.Y (to match major.minor) and is_python_X.Y.Z (to match major.minor.patch).
Note that the set of available targets depends on the configured TOOL_VERSIONS. Versions may not always be available if the root module has customized them, or as older Python versions are removed from rules_python’s set of builtin, known versions.
If you need to match a version that isn’t present, then you have two options:
Manually define a config_setting and have it match --python_version or python_version_major_minor. This works best when you don’t control the root module, or don’t want to rely on the MODULE.bazel configuration. Such a config settings would look like:
# Match any 3.5 version
config_setting(
name = "is_python_3.5",
flag_values = {
"@rules_python//python/config_settings:python_version_major_minor": "3.5",
}
)
# Match exactly 3.5.1
config_setting(
name = "is_python_3.5.1",
flag_values = {
"@rules_python//python/config_settings:python_version": "3.5.1",
}
)
Use python.single_override to re-introduce the desired version so that the corresponding //python/config_setting:is_python_XXX target is generated.
Determines if the exec_tools_toolchain_type toolchain is enabled.
Note
Note that this only affects the rules_python generated toolchains.
Values:
enabled: Allow matching of the registered toolchains at build time.
disabled: Prevent the toolchain from being matched at build time.
Added in version 0.33.2.
Determines if Python source files should be compiled at build time.
Note
The flag value is overridden by the target level precompile attribute, except for the case of force_enabled and forced_disabled.
Values:
auto: (default) Automatically decide the effective value based on environment, target platform, etc.
enabled: Compile Python source files at build time.
disabled: Don’t compile Python source files at build time.
force_enabled: Like enabled, except overrides target-level setting. This is mostly useful for development, testing enabling precompilation more broadly, or as an escape hatch if build-time compiling is not available.
force_disabled: Like disabled, except overrides target-level setting. This is useful useful for development, testing enabling precompilation more broadly, or as an escape hatch if build-time compiling is not available.
Added in version 0.33.0.
Changed in version 0.37.0: The if_generated_source value was removed
Determines, when a source file is compiled, if the source file is kept in the resulting output or not.
Note
This flag is overridden by the target level precompile_source_retention attribute.
Values:
auto: (default) Automatically decide the effective value based on environment, target platform, etc.
keep_source: Include the original Python source.
omit_source: Don’t include the orignal py source.
Added in version 0.33.0.
Added in version 0.36.0: The auto value
Changed in version 0.37.0: The omit_if_generated_source value was removed
Set what libc is used for the target platform. This will affect which whl binaries will be pulled and what toolchain will be auto-detected. Currently rules_python only supplies toolchains compatible with glibc.
Values:
glibc: Use glibc, default.
muslc: Use muslc.
Added in version 0.33.0.
Set whether to use an interpreter with the experimental freethreaded option set to true.
Values:
no: Use regular Python toolchains, default.
yes: Use the experimental Python toolchain with freethreaded compile option enabled.
Added in version 0.38.0.
The target that provides the values for pip env marker evaluation.
Default: //python/config_settings:_pip_env_marker_default_config
This flag points to a target providing EnvMarkerInfo, which determines the values used when environment markers are resolved at build time.
Added in version 1.5.0.
Set what distributions are used in the pip integration.
Values:
auto: Prefer whl distributions if they are compatible with a target platform, but fallback to sdist. This is the default.
only: Only use whl distributions and error out if it is not available.
no: Only use sdist distributions. The wheels will be built non-hermetically in the whl_library repository rule.
Added in version 0.33.0.
Set what wheel types we should prefer when building on the OSX platform.
Values:
arch: Prefer architecture specific wheels.
universal: Prefer universal wheels that usually are bigger and contain binaries for both, Intel and ARM architectures in the same wheel.
Added in version 0.33.0.
Set the minimum glibc version that the py_binary using whl distributions from a PyPI index should support.
Values:
"": Select the lowest available version of each wheel giving you the maximum compatibility. This is the default.
X.Y: The string representation of a glibc version. The allowed values depend on the requirements.txt lock file contents.
Added in version 0.33.0.
Set the minimum muslc version that the py_binary using whl distributions from a PyPI index should support.
Values:
"": Select the lowest available version of each wheel giving you the maximum compatibility. This is the default.
X.Y: The string representation of a muslc version. The allowed values depend on the requirements.txt lock file contents.
Added in version 0.33.0.
Set the minimum osx version that the py_binary using whl distributions from a PyPI index should support.
Values:
"": Select the lowest available version of each wheel giving you the maximum compatibility. This is the default.
X.Y: The string representation of the MacOS version. The allowed values depend on the requirements.txt lock file contents.
Added in version 0.33.0.
Determines if libraries use a site-packages layout for their files.
Note this flag only affects PyPI dependencies of --bootstrap_impl=script binaries
Warning
Experimental API. This API is still under development and may change or be removed without notice.
Values:
no (default): Make libraries importable by adding to sys.path
yes: Make libraries importable by creating paths in a binary’s site-packages directory.
Determine how programs implement their startup process.
Values:
system_python: (default) Use a bootstrap that requires a system Python available in order to start programs. This requires PyRuntimeInfo.bootstrap_template to be a Python program.
script: Use a bootstrap that uses an arbitrary executable script (usually a shell script) instead of requiring it be a Python program.
Note
The script bootstrap requires the toolchain to provide the PyRuntimeInfo provider from rules_python. This loosely translates to using Bazel 7+ with a toolchain created by rules_python. Most notably, WORKSPACE builds default to using a legacy toolchain built into Bazel itself which doesn’t support the script bootstrap. If not available, the system_python bootstrap will be used instead.
Added in version 0.33.0.
Fail the build if the current build configuration does not match the pip.parse defined wheels.
Values:
fail: Will fail in the build action ensuring that we get the error message no matter the action cache.
``: (empty string) The default value, that will just print a warning.
Added in version 1.1.0.
Determines if relative symlinks are created using declare_symlink() at build time.
This is only intended to work around #2489, where some packaging rules don’t support declare_symlink() artifacts.
Values:
yes: Use declare_symlink() and create relative symlinks at build time.
no: Do not use declare_symlink(). Instead, the venv will be created at runtime.
Added in version 1.2.0.
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