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Targets that install a Python package into a directory artifact (TreeArtifact) during the build phase cannot populate individual File objects in VenvSymlinkEntry.files when constructing virtual environment symlinks. Without sub-path metadata, overlapping package directories across multiple dependencies cannot be merged at file granularity. Add an experimental VenvSymlinkEntry.link_to_subpaths field (and builder support) so directory-backed entries can list their relative file paths for conflict merging, and teach virtual environment link generation to produce and merge TreeArtifact-backed entries. Single-file entries whose files holds an ancestor directory of link_to_path are now linked during conflict merging rather than skipped. Also prepare internal rule and tool helpers for build-action wheel installation with no change in default behavior: * Support multi-file bootstrap interpreter programs by staging sibling Python modules into a private directory with bytecode writing disabled. * Extract pure in-memory helpers for wheel RECORD and console-script shebang rewriting so build-time installers can reuse them directly.
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This PR was AI-assisted: the code was written by an AI coding agent under my direction and went through several rounds of agent-driven review, including checks that default-mode behavior is unchanged. I've reviewed the final change. I'll handle review comments myself; any agent-drafted replies or follow-up changes will be reviewed by me before they're posted or pushed. |
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PTAL |
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@rsartor-cmd FYI some work Jeremy is doing related to sdist stuff |
rickeylev
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Nov 2, 2026
rickeylev
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Nov 2, 2026
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Forgive me if my questions seem dumb. Its bit awhile since I was in venv_runfiles. I think I was following along, but I'm not entirely sure. The main thing I wasn't sure about is it seemed like the lists of File | str-path-within-directory are now being mixed, so i'm having a hard time following the "relativeness" of objects.
Drop the py_interpreter_program staging changes so it stays a thin bootstrap shim, normalize get_venv_symlinks inputs into typed candidate structs before grouping, clarify VenvSymlinkEntry and merge comments, fix MyST directive nesting, and rename the changelog fragment to 4396.
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aignas
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LGTM with a few questions.
Simplify the `files` expression on shared-library `VenvSymlinkEntry` records in `get_venv_symlinks`, document `tree_venv_lib` and `_assert_tree_artifact_equivalence`, and add `tree_shared_lib_loading_test` to verify loading compiled C extensions and transitive shared libraries from a `TreeArtifact`-backed venv at runtime.
Switch `tree_venv_merge_test` and `tree_shared_lib_loading_test` from `unittest.TestCase` + `py_reconfig_test` to `pytest_test` with plain `pytest` test functions and assertions.
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Targets that install a Python package into a directory artifact
(TreeArtifact) during the build phase cannot populate individual File
objects in VenvSymlinkEntry.files when constructing virtual environment
symlinks. Without sub-path metadata, overlapping package directories
across multiple dependencies cannot be merged at file granularity.
Add an experimental VenvSymlinkEntry.link_to_subpaths field (and
builder support) so directory-backed entries can list their relative
file paths for conflict merging, and teach virtual environment link
generation to produce and merge TreeArtifact-backed entries.
Single-file entries whose files holds an ancestor directory of
link_to_path are now linked during conflict merging rather than
skipped.
Also prepare internal rule and tool helpers for build-action wheel
installation with no change in default behavior:
Python modules into a private directory with bytecode writing
disabled.
shebang rewriting so build-time installers can reuse them directly.