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feat: provide access to arbitrary interpreters #2507

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4 changes: 2 additions & 2 deletions .bazelrc
Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,8 @@
# (Note, we cannot use `common --deleted_packages` because the bazel version command doesn't support it)
# To update these lines, execute
# `bazel run @rules_bazel_integration_test//tools:update_deleted_packages`
build --deleted_packages=examples/build_file_generation,examples/build_file_generation/random_number_generator,examples/bzlmod,examples/bzlmod_build_file_generation,examples/bzlmod_build_file_generation/other_module/other_module/pkg,examples/bzlmod_build_file_generation/runfiles,examples/bzlmod/entry_points,examples/bzlmod/entry_points/tests,examples/bzlmod/libs/my_lib,examples/bzlmod/other_module,examples/bzlmod/other_module/other_module/pkg,examples/bzlmod/patches,examples/bzlmod/py_proto_library,examples/bzlmod/py_proto_library/example.com/another_proto,examples/bzlmod/py_proto_library/example.com/proto,examples/bzlmod/runfiles,examples/bzlmod/tests,examples/bzlmod/tests/other_module,examples/bzlmod/whl_mods,examples/multi_python_versions/libs/my_lib,examples/multi_python_versions/requirements,examples/multi_python_versions/tests,examples/pip_parse,examples/pip_parse_vendored,examples/pip_repository_annotations,examples/py_proto_library,examples/py_proto_library/example.com/another_proto,examples/py_proto_library/example.com/proto,gazelle,gazelle/manifest,gazelle/manifest/generate,gazelle/manifest/hasher,gazelle/manifest/test,gazelle/modules_mapping,gazelle/python,gazelle/pythonconfig,gazelle/python/private,tests/integration/compile_pip_requirements,tests/integration/compile_pip_requirements_test_from_external_repo,tests/integration/custom_commands,tests/integration/ignore_root_user_error,tests/integration/ignore_root_user_error/submodule,tests/integration/local_toolchains,tests/integration/pip_parse,tests/integration/pip_parse/empty,tests/integration/py_cc_toolchain_registered
query --deleted_packages=examples/build_file_generation,examples/build_file_generation/random_number_generator,examples/bzlmod,examples/bzlmod_build_file_generation,examples/bzlmod_build_file_generation/other_module/other_module/pkg,examples/bzlmod_build_file_generation/runfiles,examples/bzlmod/entry_points,examples/bzlmod/entry_points/tests,examples/bzlmod/libs/my_lib,examples/bzlmod/other_module,examples/bzlmod/other_module/other_module/pkg,examples/bzlmod/patches,examples/bzlmod/py_proto_library,examples/bzlmod/py_proto_library/example.com/another_proto,examples/bzlmod/py_proto_library/example.com/proto,examples/bzlmod/runfiles,examples/bzlmod/tests,examples/bzlmod/tests/other_module,examples/bzlmod/whl_mods,examples/multi_python_versions/libs/my_lib,examples/multi_python_versions/requirements,examples/multi_python_versions/tests,examples/pip_parse,examples/pip_parse_vendored,examples/pip_repository_annotations,examples/py_proto_library,examples/py_proto_library/example.com/another_proto,examples/py_proto_library/example.com/proto,gazelle,gazelle/manifest,gazelle/manifest/generate,gazelle/manifest/hasher,gazelle/manifest/test,gazelle/modules_mapping,gazelle/python,gazelle/pythonconfig,gazelle/python/private,tests/integration/compile_pip_requirements,tests/integration/compile_pip_requirements_test_from_external_repo,tests/integration/custom_commands,tests/integration/ignore_root_user_error,tests/integration/ignore_root_user_error/submodule,tests/integration/local_toolchains,tests/integration/pip_parse,tests/integration/pip_parse/empty,tests/integration/py_cc_toolchain_registered
build --deleted_packages=examples/build_file_generation,examples/build_file_generation/random_number_generator,examples/bzlmod,examples/bzlmod_build_file_generation,examples/bzlmod_build_file_generation/other_module/other_module/pkg,examples/bzlmod_build_file_generation/runfiles,examples/bzlmod/entry_points,examples/bzlmod/entry_points/tests,examples/bzlmod/libs/my_lib,examples/bzlmod/other_module,examples/bzlmod/other_module/other_module/pkg,examples/bzlmod/patches,examples/bzlmod/py_proto_library,examples/bzlmod/py_proto_library/example.com/another_proto,examples/bzlmod/py_proto_library/example.com/proto,examples/bzlmod/runfiles,examples/bzlmod/tests,examples/bzlmod/tests/other_module,examples/bzlmod/whl_mods,examples/multi_python_versions/libs/my_lib,examples/multi_python_versions/requirements,examples/multi_python_versions/tests,examples/pip_parse,examples/pip_parse_vendored,examples/pip_repository_annotations,examples/py_proto_library,examples/py_proto_library/example.com/another_proto,examples/py_proto_library/example.com/proto,gazelle,gazelle/manifest,gazelle/manifest/generate,gazelle/manifest/hasher,gazelle/manifest/test,gazelle/modules_mapping,gazelle/python,gazelle/pythonconfig,gazelle/python/private,tests/integration/compile_pip_requirements,tests/integration/compile_pip_requirements_test_from_external_repo,tests/integration/custom_commands,tests/integration/ignore_root_user_error,tests/integration/ignore_root_user_error/submodule,tests/integration/interpreter,tests/integration/local_toolchains,tests/integration/pip_parse,tests/integration/pip_parse/empty,tests/integration/py_cc_toolchain_registered
query --deleted_packages=examples/build_file_generation,examples/build_file_generation/random_number_generator,examples/bzlmod,examples/bzlmod_build_file_generation,examples/bzlmod_build_file_generation/other_module/other_module/pkg,examples/bzlmod_build_file_generation/runfiles,examples/bzlmod/entry_points,examples/bzlmod/entry_points/tests,examples/bzlmod/libs/my_lib,examples/bzlmod/other_module,examples/bzlmod/other_module/other_module/pkg,examples/bzlmod/patches,examples/bzlmod/py_proto_library,examples/bzlmod/py_proto_library/example.com/another_proto,examples/bzlmod/py_proto_library/example.com/proto,examples/bzlmod/runfiles,examples/bzlmod/tests,examples/bzlmod/tests/other_module,examples/bzlmod/whl_mods,examples/multi_python_versions/libs/my_lib,examples/multi_python_versions/requirements,examples/multi_python_versions/tests,examples/pip_parse,examples/pip_parse_vendored,examples/pip_repository_annotations,examples/py_proto_library,examples/py_proto_library/example.com/another_proto,examples/py_proto_library/example.com/proto,gazelle,gazelle/manifest,gazelle/manifest/generate,gazelle/manifest/hasher,gazelle/manifest/test,gazelle/modules_mapping,gazelle/python,gazelle/pythonconfig,gazelle/python/private,tests/integration/compile_pip_requirements,tests/integration/compile_pip_requirements_test_from_external_repo,tests/integration/custom_commands,tests/integration/ignore_root_user_error,tests/integration/ignore_root_user_error/submodule,tests/integration/interpreter,tests/integration/local_toolchains,tests/integration/pip_parse,tests/integration/pip_parse/empty,tests/integration/py_cc_toolchain_registered

test --test_output=errors

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34 changes: 33 additions & 1 deletion docs/toolchains.md
Original file line number Diff line number Diff line change
Expand Up @@ -313,7 +313,7 @@ provide `Python.h`.

This is typically implemented using {obj}`py_cc_toolchain()`, which provides
{obj}`ToolchainInfo` with the field `py_cc_toolchain` set, which is a
{obj}`PyCcToolchainInfo` provider instance.
{obj}`PyCcToolchainInfo` provider instance.

This toolchain type is intended to hold only _target configuration_ values
relating to the C/C++ information for the Python runtime. As such, when defining
Expand Down Expand Up @@ -467,3 +467,35 @@ Currently the following flags are used to influence toolchain selection:
* {obj}`--@rules_python//python/config_settings:py_linux_libc` for selecting the Linux libc variant.
* {obj}`--@rules_python//python/config_settings:py_freethreaded` for selecting
the freethreaded experimental Python builds available from `3.13.0` onwards.

## Accessing the underlying interpreter

To access the interpreter that bazel manages, you can use the
`@rules_python//python/bin:interpreter` target. This is a binary target with
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Nit: why not just python?

Suggested change
`@rules_python//python/bin:interpreter` target. This is a binary target with
`@rules_python//python/bin:python` target. This is a binary target with

the executable pointing at the `python3` binary plus the relevent runfiles.

```
$ bazel run @rules_python//python/bin:interpreter
Python 3.11.1 (main, Jan 16 2023, 22:41:20) [Clang 15.0.7 ] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
$ bazel run @rules_python//python/bin:interpreter --@rules_python//python/config_settings:python_version=3.12
Python 3.12.0 (main, Oct 3 2023, 01:27:23) [Clang 17.0.1 ] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
```

You can also access a specific binary's interpreter this way by using the
`@rules_python//python/bin:interpreter_src` target.

```
$ bazel run @rules_python//python/bin:interpreter --@rules_python//python/bin:interpreter_src=//path/to:bin
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Need to find an "aha!" example for this.

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What about using the publishing twine binary? Something that exists within rules_python could do the trick.

Python 3.11.1 (main, Jan 16 2023, 22:41:20) [Clang 15.0.7 ] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
```

:::{note}
The interpreter target does not provide access to any modules from `py_*`
targets on its own. Work is ongoing to support that.
:::
1 change: 1 addition & 0 deletions python/BUILD.bazel
Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@ filegroup(
name = "distribution",
srcs = glob(["**"]) + [
"//python/api:distribution",
"//python/bin:distribution",
"//python/cc:distribution",
"//python/config_settings:distribution",
"//python/constraints:distribution",
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22 changes: 22 additions & 0 deletions python/bin/BUILD.bazel
Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
load("//python:defs.bzl", "py_binary")
load(":interpreter.bzl", "interpreter")

package(default_visibility = ["//visibility:public"])

filegroup(
name = "distribution",
srcs = glob(["**"]),
visibility = ["//python:__pkg__"],
)

interpreter(
name = "interpreter",
binary = ":interpreter_src",
)

# The user can modify this flag to source different interpreters for the
# `interpreter` target above.
label_flag(
name = "interpreter_src",
build_setting_default = "//python:none",
)
40 changes: 40 additions & 0 deletions python/bin/interpreter.bzl
Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
load("@bazel_skylib//lib:paths.bzl", "paths")
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Please move the implementation to //python/private/interpreter.bzl and re-export here

load("@bazel_skylib//rules:common_settings.bzl", "BuildSettingInfo")
load("//python:py_runtime_info.bzl", "PyRuntimeInfo")
load("//python/private:sentinel.bzl", "SentinelInfo")
load("//python/private:toolchain_types.bzl", "TARGET_TOOLCHAIN_TYPE")

def _interpreter_impl(ctx):
if SentinelInfo in ctx.attr.binary:
toolchain = ctx.toolchains[TARGET_TOOLCHAIN_TYPE]
runtime = toolchain.py3_runtime
else:
runtime = ctx.attr.binary[PyRuntimeInfo]

# NOTE: We name the output filename after the underlying file name
# because of things like pyenv: they use $0 to determine what to
# re-exec. If it's not a recognized name, then they fail.
if runtime.interpreter:
executable = ctx.actions.declare_file(runtime.interpreter.basename)
ctx.actions.symlink(output = executable, target_file = runtime.interpreter, is_executable = True)
else:
executable = ctx.actions.declare_symlink(paths.basename(runtime.interpreter_path))
ctx.actions.symlink(output = executable, target_path = runtime.interpreter_path)

return [
DefaultInfo(
executable = executable,
runfiles = ctx.runfiles([executable], transitive_files = runtime.files),
),
]

interpreter = rule(
implementation = _interpreter_impl,
toolchains = [TARGET_TOOLCHAIN_TYPE],
executable = True,
attrs = {
"binary": attr.label(
mandatory = True,
),
},
)
5 changes: 5 additions & 0 deletions tests/integration/BUILD.bazel
Original file line number Diff line number Diff line change
Expand Up @@ -120,6 +120,11 @@ rules_python_integration_test(
py_main = "custom_commands_test.py",
)

rules_python_integration_test(
name = "interpreter_test",
py_main = "interpreter_test.py",
)

py_library(
name = "runner_lib",
srcs = ["runner.py"],
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13 changes: 13 additions & 0 deletions tests/integration/interpreter/BUILD.bazel
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
# Copyright 2024 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
21 changes: 21 additions & 0 deletions tests/integration/interpreter/MODULE.bazel
Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
# Copyright 2024 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

module(name = "module_under_test")

bazel_dep(name = "rules_python", version = "0.0.0")
local_path_override(
module_name = "rules_python",
path = "../../..",
)
Empty file.
74 changes: 74 additions & 0 deletions tests/integration/interpreter_test.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
# Copyright 2024 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import logging
import unittest

from tests.integration import runner


class InterpreterTest(runner.TestCase):
def _run_version_test(self, expected_version):
"""Validates that we can successfully execute arbitrary code from the CLI."""
result = self.run_bazel(
"run",
f"--@rules_python//python/config_settings:python_version={expected_version}",
"@rules_python//python/bin:interpreter",
input = "\r".join([
"import sys",
"v = sys.version_info",
"print(f'version: {v.major}.{v.minor}')",
]),
)
self.assert_result_matches(result, f"version: {expected_version}")

def test_run_interpreter_3_10(self):
self._run_version_test("3.10")

def test_run_interpreter_3_11(self):
self._run_version_test("3.11")

def test_run_interpreter_3_12(self):
self._run_version_test("3.12")

def _run_module_test(self, version):
"""Validates that we can successfully invoke a module from the CLI."""
# Pass unformatted JSON to the json.tool module.
result = self.run_bazel(
"run",
f"--@rules_python//python/config_settings:python_version={version}",
"@rules_python//python/bin:interpreter",
"--",
"-m",
"json.tool",
input = '{"json":"obj"}',
)
# Validate that we get formatted JSON back.
self.assert_result_matches(result, r'{\n "json": "obj"\n}')

def test_run_module_3_10(self):
self._run_module_test("3.10")

def test_run_module_3_11(self):
self._run_module_test("3.11")

def test_run_module_3_12(self):
self._run_module_test("3.12")
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It would be great to add a test that imports:

  • The code that is in the //python/bin:interpreter_src
  • The code that is in the transitive deps of the //python/bin:interpreter_src. Maybe depending on twine could be an option in the tests and then we could attempt importing one of its deps?




if __name__ == "__main__":
# Enabling this makes the runner log subprocesses as the test goes along.
# logging.basicConfig(level = "INFO")
unittest.main()
3 changes: 2 additions & 1 deletion tests/integration/runner.py
Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,7 @@ def setUp(self):
"RUNFILES_DIR": os.environ["TEST_SRCDIR"]
}

def run_bazel(self, *args: str, check: bool = True) -> ExecuteResult:
def run_bazel(self, *args: str, input=None, check: bool = True) -> ExecuteResult:
"""Run a bazel invocation.

Args:
Expand All @@ -104,6 +104,7 @@ def run_bazel(self, *args: str, check: bool = True) -> ExecuteResult:
proc_result = subprocess.run(
args=args,
text=True,
input=input,
capture_output=True,
cwd=cwd,
env=env,
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