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environment-variables.md

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Environment Variables

:::{envvar} RULES_PYTHON_BOOTSTRAP_VERBOSE

When 1, debug information about bootstrapping of a program is printed to stderr. :::

:::{envvar} RULES_PYTHON_BZLMOD_DEBUG

When 1, bzlmod extensions will print debug information about what they're doing. This is mostly useful for development to debug errors. :::

:::{envvar} RULES_PYTHON_DEPRECATION_WARNINGS

When 1, the rules_python will warn users about deprecated functionality that will be removed in a subsequent major rules_python version. Defaults to 0 if unset. :::

:::{envvar} RULES_PYTHON_ENABLE_PYSTAR

When 1, the rules_python Starlark implementation of the core rules is used instead of the Bazel-builtin rules. Note this requires Bazel 7+. :::

::::{envvar} RULES_PYTHON_EXTRACT_ROOT

Directory to use as the root for creating files necessary for bootstrapping so that a binary can run.

Only applicable when {bzl:flag}--venvs_use_declare_symlink=no is used.

When set, a binary will attempt to find a unique, reusable, location within this directory for the files it needs to create to aid startup. The files may not be deleted upon program exit; it is the responsibility of the caller to ensure cleanup.

Manually specifying the directory is useful to lower the overhead of extracting/creating files on every program execution. By using a location outside /tmp, longer lived programs don't have to worry about files in /tmp being cleaned up by the OS.

If not set, then a temporary directory will be created and deleted upon program exit.

:::{versionadded} 1.2.0 ::: ::::

:::{envvar} RULES_PYTHON_GAZELLE_VERBOSE

When 1, debug information from gazelle is printed to stderr. :::

:::{envvar} RULES_PYTHON_PIP_ISOLATED

Determines if --isolated is used with pip.

Valid values:

  • 0 and false mean to not use isolated mode
  • Other non-empty values mean to use isolated mode. :::

:::{envvar} RULES_PYTHON_REPO_DEBUG

When 1, repository rules will print debug information about what they're doing. This is mostly useful for development to debug errors. :::

:::{envvar} RULES_PYTHON_REPO_DEBUG_VERBOSITY

Determines the verbosity of logging output for repo rules. Valid values:

  • DEBUG
  • INFO
  • TRACE :::

:::{envvar} RULES_PYTHON_REPO_TOOLCHAIN_VERSION_OS_ARCH

Determines the python interpreter platform to be used for a particular interpreter (version, os, arch) triple to be used in repository rules. Replace the VERSION_OS_ARCH part with actual values when using, e.g. 3_13_0_linux_x86_64. The version values must have _ instead of . and the os, arch values are the same as the ones mentioned in the //python:versions.bzl file. :::

:::{envvar} VERBOSE_COVERAGE

When 1, debug information about coverage behavior is printed to stderr. :::