feat(venv): Make the venv linking strategy configurable

[arrdem]

Add a config_setting allowing users to toggle the default venv strategy so that users have to explicitly opt into the new-style static venv.

Mitigates #696

Changes are visible to end-users: yes

• Searched for relevant documentation and updated as needed: yes
• Breaking change (forces users to change their own code or config): yes
• Suggested release notes appear below: yes

Test plan

• Manual testing; please provide instructions so we can reproduce:

TODO

[aspect-workflows]

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

⚠️ Buildkite build #1331 failed.

@@+uv+pypi//:all_whl_requirements failed to build

error loading package '@@+uv+pypi//': at /mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6:
compilation of module 'py/private/link/defs.bzl' failed

@@+uv+venv__pypi__default//cowsay:cowsay failed to build

error loading package '@@+uv+venv__pypi__default//cowsay': at
/mnt/ephemeral/workdir/aspect-build/rules_py/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

error loading package '@@+uv+venv__pypi__default//cowsay': at
/mnt/ephemeral/workdir/aspect-build/rules_py/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

//py:defs.doc_extract failed to build

in src attribute of starlark_doc_extract rule //py:defs.doc_extract: at
/mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed. Since this rule was created by the macro 'bzl_library', the error might
have been caused by the macro implementation

💡 To reproduce the build failures, run

bazel build @@+uv+pypi//:all_whl_requirements @@+uv+venv__pypi__default//cowsay:cowsay //py:defs.doc_extract

---

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

⚠️ Buildkite build #1331 failed.

@@+uv+venv__pypi__default//cowsay:cowsay failed to build

error loading package '@@+uv+venv__pypi__default//cowsay': at
/mnt/ephemeral/workdir/aspect-build/rules_py/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

error loading package '@@+uv+venv__pypi__default//cowsay': at
/mnt/ephemeral/workdir/aspect-build/rules_py/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

@@+uv+pypi//:all_whl_requirements failed to build

error loading package '@@+uv+pypi//': at /mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6:
compilation of module 'py/private/link/defs.bzl' failed

//py:defs.doc_extract failed to build

in src attribute of starlark_doc_extract rule //py:defs.doc_extract: at
/mnt/ephemeral/workdir/aspect-build/rules_py/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed. Since this rule was created by the macro 'bzl_library', the error might
have been caused by the macro implementation

💡 To reproduce the build failures, run

bazel build @@+uv+venv__pypi__default//cowsay:cowsay @@+uv+pypi//:all_whl_requirements //py:defs.doc_extract

---

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

e2e

⚠️ Buildkite build #1331 failed.

@@aspect_rules_py++uv+venv__pypi__say//cowsay:cowsay failed to build

error loading package '@@aspect_rules_py++uv+venv__pypi__say//cowsay': at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

@@+_repo_rules2+subrepo_a//:foo failed to build

error loading package '@@+_repo_rules2+subrepo_a//': at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

@@aspect_rules_py++uv+venv__pypi__airflow//apache_airflow:apache_airflow failed to build

error loading package '@@aspect_rules_py++uv+venv__pypi__airflow//apache_airflow': at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

💡 To reproduce the build failures, run

bazel build @@aspect_rules_py++uv+venv__pypi__say//cowsay:cowsay @@+_repo_rules2+subrepo_a//:foo @@aspect_rules_py++uv+venv__pypi__airflow//apache_airflow:apache_airflow

---

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

e2e

⚠️ Buildkite build #1331 failed.

@@aspect_rules_py++uv+venv__pypi__say//cowsay:cowsay failed to build

error loading package '@@aspect_rules_py++uv+venv__pypi__say//cowsay': at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

@@+_repo_rules2+subrepo_a//:foo failed to build

error loading package '@@+_repo_rules2+subrepo_a//': at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

@@aspect_rules_py++uv+venv__pypi__airflow//apache_airflow:apache_airflow failed to build

error loading package '@@aspect_rules_py++uv+venv__pypi__airflow//apache_airflow': at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/uv/private/defs.bzl:4:6: at
/mnt/ephemeral/output/rules_py/e2e/external/aspect_rules_py+/py/defs.bzl:45:6: compilation of module
'py/private/link/defs.bzl' failed

💡 To reproduce the build failures, run

bazel build @@aspect_rules_py++uv+venv__pypi__say//cowsay:cowsay @@+_repo_rules2+subrepo_a//:foo @@aspect_rules_py++uv+venv__pypi__airflow//apache_airflow:apache_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.

[MohitBhar]

Hi @arrdem this fixes the ModuleNotFoundError. However, with this fix, jumping to the definition of an internal library doesn't work in VS Code.