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revert: change default bootstrap back to system_python #2968

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Jun 11, 2025
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revert: change default bootstrap back to system_python #2968

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828cbe4
revert: change default bootstrap back to system_python
rickeylev Jun 11, 2025
157478d
revert changlog and docs
rickeylev Jun 11, 2025
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8 changes: 0 additions & 8 deletions CHANGELOG.md
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Expand Up @@ -55,14 +55,6 @@ END_UNRELEASED_TEMPLATE
{#v0-0-0-changed}
### Changed

* If using the (deprecated) autodetecting/runtime_env toolchain, then the Python
version specified at build-time *must* match the Python version used at
runtime (the {obj}`--@rules_python//python/config_settings:python_version`
flag and the {attr}`python_version` attribute control the build-time version
for a target). If they don't match, dependencies won't be importable. (Such a
misconfiguration was unlikely to work to begin with; this is called out as an
FYI).
* (rules) {obj}`--bootstrap_impl=script` is the default for non-Windows.
* (rules) On Windows, {obj}`--bootstrap_impl=system_python` is forced. This
allows setting `--bootstrap_impl=script` in bazelrc for mixed-platform
environments.
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11 changes: 1 addition & 10 deletions docs/api/rules_python/python/config_settings/index.md
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Expand Up @@ -245,12 +245,8 @@ Values:
::::{bzl:flag} bootstrap_impl
Determine how programs implement their startup process.

The default for this depends on the platform:
* Windows: `system_python` (**always** used)
* Other: `script`

Values:
* `system_python`: Use a bootstrap that requires a system Python available
* `system_python`: (default) Use a bootstrap that requires a system Python available
in order to start programs. This requires
{obj}`PyRuntimeInfo.bootstrap_template` to be a Python program.
* `script`: Use a bootstrap that uses an arbitrary executable script (usually a
Expand All @@ -273,11 +269,6 @@ instead.
:::{versionadded} 0.33.0
:::

:::{versionchanged} VERSION_NEXT_FEATURE
* The default for non-Windows changed from `system_python` to `script`.
* On Windows, the value is forced to `system_python`.
:::

::::

::::{bzl:flag} current_config
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2 changes: 1 addition & 1 deletion python/config_settings/BUILD.bazel
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Expand Up @@ -90,7 +90,7 @@ string_flag(

rp_string_flag(
name = "bootstrap_impl",
build_setting_default = BootstrapImplFlag.SCRIPT,
build_setting_default = BootstrapImplFlag.SYSTEM_PYTHON,
override = select({
# Windows doesn't yet support bootstrap=script, so force disable it
":_is_windows": BootstrapImplFlag.SYSTEM_PYTHON,
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