Fix freethreaded builds by passing HERMETIC_PYTHON_VERSION_KIND in repository rules.

The problem was that `@python_<>_host` repository wasn't aware of the python type (controlled by the build flag `@rules_python//python/config_settings:py_freethreaded`) and selected the first candidate, e.g. GIL version of the python.

PiperOrigin-RevId: 808825370

third_party/py/python_init_toolchains.bzl

@@ -6,6 +6,7 @@ load(
     "HERMETIC_PYTHON_SHA256",
     "HERMETIC_PYTHON_URL",
     "HERMETIC_PYTHON_VERSION",
+    "HERMETIC_PYTHON_VERSION_KIND",
 )
 load("@rules_python//python:repositories.bzl", "python_register_toolchains")
 load("@rules_python//python:versions.bzl", "MINOR_MAPPING", "PLATFORMS")
@@ -67,4 +68,5 @@ def python_init_toolchains(name = "python", python_version = None, **kwargs):
             name = get_toolchain_name_per_python_version(name),
             ignore_root_user_error = True,
             python_version = HERMETIC_PYTHON_VERSION,
+            python_version_kind = HERMETIC_PYTHON_VERSION_KIND,
         )

third_party/py/rules_python_freethreaded.patch

@@ -1,5 +1,25 @@
+diff --git a/python/private/python_register_toolchains.bzl b/python/private/python_register_toolchains.bzl
+index 2e0748de..42223d51 100644
+--- a/python/private/python_register_toolchains.bzl
++++ b/python/private/python_register_toolchains.bzl
+@@ -94,6 +94,7 @@ def python_register_toolchains(
+     minor_mapping = minor_mapping or MINOR_MAPPING
+ 
+     python_version = full_version(version = python_version, minor_mapping = minor_mapping)
++    python_version_kind = kwargs.pop("python_version_kind", "")
+ 
+     toolchain_repo_name = "{name}_toolchains".format(name = name)
+ 
+@@ -189,6 +190,7 @@ def python_register_toolchains(
+         name = name + "_host",
+         platforms = loaded_platforms,
+         python_version = python_version,
++        python_version_kind = python_version_kind,
+     )
+ 
+     toolchains_repo(
 diff --git a/python/private/toolchains_repo.bzl b/python/private/toolchains_repo.bzl
-index 93bbb521..f7ff19c3 100644
+index 93bbb521..ad9cd7fd 100644
 --- a/python/private/toolchains_repo.bzl
 +++ b/python/private/toolchains_repo.bzl
 @@ -214,7 +214,7 @@ def python_toolchain_build_file_content(
@@ -11,3 +31,24 @@ index 93bbb521..f7ff19c3 100644
          ))
      return "\n\n".join(entries)
  
+@@ -445,6 +445,10 @@ Full python version, Major.Minor.Micro.
+ Only set in workspace calls.
+ """,
+         ),
++        "python_version_kind": attr.string(
++            doc = "Python version kind, e.g. ft (free-threaded)",
++            default = ""
++        ),
+         "python_versions": attr.string_dict(
+             doc = """
+ If set, the Python version for the corresponding selected platform. Values in
+@@ -603,6 +609,9 @@ def _get_host_impl_repo_name(*, rctx, logger, python_version, os_name, cpu_name,
+         else:
+             candidates = [preference]
+ 
++        if rctx.attr.python_version_kind == "ft":
++            candidates = [c for c in candidates if c[0].endswith("freethreaded")]
++
+     if candidates:
+         platform_name, meta = candidates[0]
+         suffix = meta.impl_repo_name

third_party/xla/third_party/py/python_init_toolchains.bzl

@@ -6,6 +6,7 @@ load(
     "HERMETIC_PYTHON_SHA256",
     "HERMETIC_PYTHON_URL",
     "HERMETIC_PYTHON_VERSION",
+    "HERMETIC_PYTHON_VERSION_KIND",
 )
 load("@rules_python//python:repositories.bzl", "python_register_toolchains")
 load("@rules_python//python:versions.bzl", "MINOR_MAPPING", "PLATFORMS")
@@ -67,4 +68,5 @@ def python_init_toolchains(name = "python", python_version = None, **kwargs):
             name = get_toolchain_name_per_python_version(name),
             ignore_root_user_error = True,
             python_version = HERMETIC_PYTHON_VERSION,
+            python_version_kind = HERMETIC_PYTHON_VERSION_KIND,
         )

third_party/xla/third_party/py/rules_python_freethreaded.patch

@@ -1,5 +1,25 @@
+diff --git a/python/private/python_register_toolchains.bzl b/python/private/python_register_toolchains.bzl
+index 2e0748de..42223d51 100644
+--- a/python/private/python_register_toolchains.bzl
++++ b/python/private/python_register_toolchains.bzl
+@@ -94,6 +94,7 @@ def python_register_toolchains(
+     minor_mapping = minor_mapping or MINOR_MAPPING
+ 
+     python_version = full_version(version = python_version, minor_mapping = minor_mapping)
++    python_version_kind = kwargs.pop("python_version_kind", "")
+ 
+     toolchain_repo_name = "{name}_toolchains".format(name = name)
+ 
+@@ -189,6 +190,7 @@ def python_register_toolchains(
+         name = name + "_host",
+         platforms = loaded_platforms,
+         python_version = python_version,
++        python_version_kind = python_version_kind,
+     )
+ 
+     toolchains_repo(
 diff --git a/python/private/toolchains_repo.bzl b/python/private/toolchains_repo.bzl
-index 93bbb521..f7ff19c3 100644
+index 93bbb521..ad9cd7fd 100644
 --- a/python/private/toolchains_repo.bzl
 +++ b/python/private/toolchains_repo.bzl
 @@ -214,7 +214,7 @@ def python_toolchain_build_file_content(
@@ -11,3 +31,24 @@ index 93bbb521..f7ff19c3 100644
          ))
      return "\n\n".join(entries)
  
+@@ -445,6 +445,10 @@ Full python version, Major.Minor.Micro.
+ Only set in workspace calls.
+ """,
+         ),
++        "python_version_kind": attr.string(
++            doc = "Python version kind, e.g. ft (free-threaded)",
++            default = ""
++        ),
+         "python_versions": attr.string_dict(
+             doc = """
+ If set, the Python version for the corresponding selected platform. Values in
+@@ -603,6 +609,9 @@ def _get_host_impl_repo_name(*, rctx, logger, python_version, os_name, cpu_name,
+         else:
+             candidates = [preference]
+ 
++        if rctx.attr.python_version_kind == "ft":
++            candidates = [c for c in candidates if c[0].endswith("freethreaded")]
++
+     if candidates:
+         platform_name, meta = candidates[0]
+         suffix = meta.impl_repo_name