use internal config repo instead

Author: aignas

python/config_settings/BUILD.bazel

@@ -1,5 +1,6 @@
 load("@bazel_skylib//rules:common_settings.bzl", "bool_flag", "string_flag")
 load("@pythons_hub//:versions.bzl", "DEFAULT_PYTHON_VERSION", "MINOR_MAPPING", "PYTHON_VERSIONS")
+load("@rules_python_internal//:rules_python_config.bzl", rp_config = "config")
 load(
     "//python/private:flags.bzl",
     "AddSrcsToRunfilesFlag",
@@ -13,7 +14,6 @@ load(
     "VenvsUseDeclareSymlinkFlag",
     rp_string_flag = "string_flag",
 )
-load("//python/private:util.bzl", "IS_BAZEL_8_OR_HIGHER")
 load(
     "//python/private/pypi:flags.bzl",
     "UniversalWhlFlag",
@@ -91,7 +91,7 @@ string_flag(
 
 rp_string_flag(
     name = "bootstrap_impl",
-    build_setting_default = BootstrapImplFlag.SCRIPT if IS_BAZEL_8_OR_HIGHER else BootstrapImplFlag.SYSTEM_PYTHON,
+    build_setting_default = rp_config.bootstrap_impl_default,
     override = select({
         # Windows doesn't yet support bootstrap=script, so force disable it
         ":_is_windows": BootstrapImplFlag.SYSTEM_PYTHON,

python/private/internal_config_repo.bzl

@@ -18,6 +18,7 @@ such as globals available to Bazel versions, or propagating user environment
 settings for rules to later use.
 """
 
+load("//python/private:flags.bzl", "BootstrapImplFlag")
 load("//python/private:text_util.bzl", "render")
 load(":repo_utils.bzl", "repo_utils")
 
@@ -30,6 +31,7 @@ _CONFIG_TEMPLATE = """
 config = struct(
   enable_pystar = True,
   enable_pipstar = {enable_pipstar},
+  bootstrap_impl_default = "{bootstrap_impl_default}",
   enable_deprecation_warnings = {enable_deprecation_warnings},
   BuiltinPyInfo = getattr(getattr(native, "legacy_globals", None), "PyInfo", {builtin_py_info_symbol}),
   BuiltinPyRuntimeInfo = getattr(getattr(native, "legacy_globals", None), "PyRuntimeInfo", {builtin_py_runtime_info_symbol}),
@@ -86,32 +88,32 @@ _TRANSITION_SETTINGS_DEBUG_TEMPLATE = """
 """
 
 def _internal_config_repo_impl(rctx):
+    # TODO: remove the conditional once bazel 7 is no longer supported
     if not native.bazel_version or int(native.bazel_version.split(".")[0]) >= 8:
         builtin_py_info_symbol = "None"
         builtin_py_runtime_info_symbol = "None"
         builtin_py_cc_link_params_provider = "None"
+        bootstrap_impl_default = BootstrapImplFlag.SCRIPT
     else:
         builtin_py_info_symbol = "PyInfo"
         builtin_py_runtime_info_symbol = "PyRuntimeInfo"
         builtin_py_cc_link_params_provider = "PyCcLinkParamsProvider"
+        bootstrap_impl_default = BootstrapImplFlag.SYSTEM_PYTHON
 
     rctx.file("rules_python_config.bzl", _CONFIG_TEMPLATE.format(
         enable_pipstar = _bool_from_environ(rctx, _ENABLE_PIPSTAR_ENVVAR_NAME, _ENABLE_PIPSTAR_DEFAULT),
+        bootstrap_impl_default = bootstrap_impl_default,
         enable_deprecation_warnings = _bool_from_environ(rctx, _ENABLE_DEPRECATION_WARNINGS_ENVVAR_NAME, _ENABLE_DEPRECATION_WARNINGS_DEFAULT),
         builtin_py_info_symbol = builtin_py_info_symbol,
         builtin_py_runtime_info_symbol = builtin_py_runtime_info_symbol,
         builtin_py_cc_link_params_provider = builtin_py_cc_link_params_provider,
     ))
 
-    shim_content = _PY_INTERNAL_SHIM
-    py_internal_dep = '"@rules_python//tools/build_defs/python/private:py_internal_renamed_bzl"'
-
     rctx.file("BUILD", ROOT_BUILD_TEMPLATE.format(
-        py_internal_dep = py_internal_dep,
+        py_internal_dep = '"@rules_python//tools/build_defs/python/private:py_internal_renamed_bzl"',
         visibility = "@rules_python//:__subpackages__",
     ))
-    rctx.file("py_internal.bzl", shim_content)
-
+    rctx.file("py_internal.bzl", _PY_INTERNAL_SHIM)
     rctx.file(
         "extra_transition_settings.bzl",
         _EXTRA_TRANSITIONS_TEMPLATE.format(

python/private/util.bzl

@@ -69,6 +69,3 @@ def add_tag(attrs, tag):
             attrs["tags"] = tags + [tag]
     else:
         attrs["tags"] = [tag]
-
-# `config.none` was introduced in Bazel 8
-IS_BAZEL_8_OR_HIGHER = hasattr(config, "none")