perf: py_venv.bzl optimizations

[dzbarsky]

• Avoid depset flattening
• Avoid explicit .path usage so we can enable path-mapping and dedupe the action across configs
• Drive-by upgrade rules_rs so we can stop cloning multiple copies of UV repo

Changes are visible to end-users: no

Test plan

• Covered by existing test cases

[dzbarsky]

py_toolchain should already be in rfs

[aspect-workflows]

test-os:linux-bzl:8 (Test)

⚠️ Buildkite build #1439 failed.

@@+uv+whl_install__pypi__default__bravado_core//:actual_install failed to build

unpack failed: error executing Action command (from target @@+uv+whl_install__pypi__default__bravado_core//:actual_install) bazel-out/k8-opt-exec-ST-a2b2cf5b3f92/bin/py/tools/unpack_bin/unpack --into bazel-out/k8-fastbuild/bin/external/+uv+whl_install__pypi__default__bravado_core/install --wheel ... (remaining 5 arguments skipped)
 
Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
 
Error:   × Unable to run command:
  ├─▶ Didn't find exactly one wheel file to install!
  ╰─▶ got zero elements when exactly one was expected

//py/tests/py-binary:run_py_test_help failed to build

bash failed: error executing Genrule command (from target //py/tests/py-binary:run_py_test_help) /bin/bash -c ... (remaining 1 argument skipped)
 
Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
 
Traceback (most recent call last):
  File "/mnt/ephemeral/output/rules_py/__main__/sandbox/linux-sandbox/913/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/external/+uv+venv__pypi__default/pytest/entrypoints/pytest.runfiles/+uv+venv__pypi__default/pytest/entrypoints/_pytest_entrypoint.py", line 2, in <module>
    from pytest import console_main
ModuleNotFoundError: No module named 'pytest'

Failed tests (5)

//py/tests/py-venv-standalone-interpreter:test [k8-fastbuild]                             🔗
//py/tests/py_venv_conflict:validate_import_roots [k8-fastbuild]                          🔗
//py/tests/py_venv_image_layer:py_amd64_image_command_test [k8-fastbuild]                 🔗
//py/tests/py_venv_image_layer:py_amd64_image_content_test [k8-fastbuild]                 🔗
//py/tests/py_venv_image_layer:py_arm64_image_content_test [k8-fastbuild]                 🔗

💡 To reproduce the build failures, run

bazel build @@+uv+whl_install__pypi__default__bravado_core//:actual_install //py/tests/py-binary:run_py_test_help

💡 To reproduce the test failures, run

bazel test //py/tests/py_venv_image_layer:py_amd64_image_content_test //py/tests/py_venv_image_layer:py_amd64_image_command_test //py/tests/py_venv_conflict:validate_import_roots //py/tests/py_venv_image_layer:py_arm64_image_content_test //py/tests/py-venv-standalone-interpreter:test

---

test-os:linux-bzl:latest (Test)

⚠️ Buildkite build #1439 failed.

//py/tests/py-binary:run_py_test_help failed to build

bash failed: error executing Genrule command (from target //py/tests/py-binary:run_py_test_help) /bin/bash -c ... (remaining 1 argument skipped)
 
Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
 
Traceback (most recent call last):
  File "/mnt/ephemeral/output/rules_py/__main__/sandbox/linux-sandbox/793/execroot/_main/bazel-out/k8-opt-exec-ST-d57f47055a04/bin/external/+uv+venv__pypi__default/pytest/entrypoints/pytest.runfiles/+uv+venv__pypi__default/pytest/entrypoints/_pytest_entrypoint.py", line 2, in <module>
    from pytest import console_main
ModuleNotFoundError: No module named 'pytest'

@@+uv+whl_install__pypi__default__bravado_core//:actual_install failed to build

unpack failed: error executing Action command (from target @@+uv+whl_install__pypi__default__bravado_core//:actual_install) bazel-out/k8-opt-exec-ST-a2b2cf5b3f92/bin/py/tools/unpack_bin/unpack --into bazel-out/k8-fastbuild/bin/external/+uv+whl_install__pypi__default__bravado_core/install --wheel ... (remaining 5 arguments skipped)
 
Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
 
Error:   × Unable to run command:
  ├─▶ Didn't find exactly one wheel file to install!
  ╰─▶ got zero elements when exactly one was expected

Failed tests (5)

//py/tests/py-venv-standalone-interpreter:test [k8-fastbuild]                             🔗
//py/tests/py_venv_conflict:validate_import_roots [k8-fastbuild]                          🔗
//py/tests/py_venv_image_layer:py_amd64_image_command_test [k8-fastbuild]                 🔗
//py/tests/py_venv_image_layer:py_amd64_image_content_test [k8-fastbuild]                 🔗
//py/tests/py_venv_image_layer:py_arm64_image_content_test [k8-fastbuild]                 🔗

💡 To reproduce the build failures, run

bazel build //py/tests/py-binary:run_py_test_help @@+uv+whl_install__pypi__default__bravado_core//:actual_install

💡 To reproduce the test failures, run

bazel test //py/tests/py_venv_image_layer:py_arm64_image_content_test //py/tests/py_venv_conflict:validate_import_roots //py/tests/py_venv_image_layer:py_amd64_image_command_test //py/tests/py_venv_image_layer:py_amd64_image_content_test //py/tests/py-venv-standalone-interpreter:test

---

test-os:linux-bzl:8 (Test)

e2e

⚠️ Buildkite build #1439 failed.

Failed tests (4)

//cases/uv-deps-650/airflow:airflow [k8-fastbuild-ST-ba1312b31f78]                        🔗
//cases/uv-deps-650/crossbuild:app_amd64_layers_test [k8-fastbuild]                       🔗
//cases/uv-deps-650/crossbuild:app_arm64_layers_test [k8-fastbuild]                       🔗
//cases/uv-deps-650/say:say [k8-fastbuild-ST-934aa07688c9]                                🔗

💡 To reproduce the test failures, run

bazel test //cases/uv-deps-650/crossbuild:app_amd64_layers_test //cases/uv-deps-650/airflow:airflow //cases/uv-deps-650/crossbuild:app_arm64_layers_test //cases/uv-deps-650/say:say

---

test-os:linux-bzl:latest (Test)

e2e

⚠️ Buildkite build #1439 failed.

Failed tests (4)

//cases/uv-deps-650/airflow:airflow [k8-fastbuild-ST-ba1312b31f78]                        🔗
//cases/uv-deps-650/crossbuild:app_amd64_layers_test [k8-fastbuild]                       🔗
//cases/uv-deps-650/crossbuild:app_arm64_layers_test [k8-fastbuild]                       🔗
//cases/uv-deps-650/say:say [k8-fastbuild-ST-934aa07688c9]                                🔗

💡 To reproduce the test failures, run

bazel test //cases/uv-deps-650/crossbuild:app_arm64_layers_test //cases/uv-deps-650/crossbuild:app_amd64_layers_test //cases/uv-deps-650/say:say //cases/uv-deps-650/airflow:airflow

---

test-os:linux-bzl:8 (Test)

examples/uv_pip_compile

All tests were cache hits

1 test (100.0%) was fully cached saving 335ms.

---

test-os:linux-bzl:latest (Test)

examples/uv_pip_compile

All tests were cache hits

1 test (100.0%) was fully cached saving 335ms.