Import Python Bazel rules from rules_python

[mortenmj]

Rules such as py_runtime and py_runtime_pair are no longer part of Bazel core as of version 8.0.0 (released today), and should be imported from https://github.com/bazelbuild/rules_python/tree/main. These can be loaded through Bazel for now, by opting into a flag, but that ability is intended to go away in the next major release.

[mering]

Note: An alternative is to use a hermetic toolchain from rules_python.

For MODULE.bazel:

bazel_dep(name = "rules_python", version = "1.0.0")
PYTHON_VERSIONS = [
    "3.10",
    "3.11",
    "3.12",
    "3.13",
]
python = use_extension("@rules_python//python/extensions:python.bzl", "python")
[
    python.toolchain(
        is_default = python_version == PYTHON_VERSIONS[-1],  # Choose last version as default.
        python_version = python_version,
    )
    for python_version in PYTHON_VERSIONS
]

Then apply the following patch:

diff --git a/python/BUILD b/python/BUILD
index 12936ad..0afe833 100644
--- a/python/BUILD
+++ b/python/BUILD
@@ -4,7 +4,7 @@ cc_binary(
     linkshared = 1,
     deps = [
         "//core:libjsonnet",
-        "@default_python3_headers//:headers",
+        "@rules_python//python/cc:current_py_cc_headers",
     ],
 )

This allows removing platform_defs folder and tools/build_defs/python_repo.bzl.

[simonff]

/sub

[DarkAngel35-commits]

MODULE.bazel