host_env: rustix for unlinkat, fix clippy deny by joshuamegnauth54 · Pull Request #8591 · RustPython/RustPython

joshuamegnauth54 · 2026-08-24T14:06:45Z

Like the other patches, this greatly simplifies our unlinkat code and is overall nicer because it uses the syscall directly on Linux.

As an added benefit, this commit adds WASI support and fixes a clippy deny. The old code caused clippy to complain that the WASI branch bypassed host_env for remove/unlink.

Closes #xxxx

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Summary

Simplify os.remove for Unix-likes
Fix a clippy deny for WASI

Summary by CodeRabbit

Bug Fixes
- Improved consistency when removing files through the POSIX interface across supported platforms.
- File removal now supports paths relative to an optional directory descriptor, including on Redox and WASI.
- Preserved clear operating system error reporting, including the affected filename, when removal fails.

coderabbitai · 2026-08-24T14:07:11Z

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crates/vm/src/stdlib/posix_compat.rs

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📝 Walkthrough

Walkthrough

The change replaces platform-specific file removal branches with a shared unlinkat helper. The helper accepts an optional directory descriptor and defaults to the current working directory. WASI uses a dedicated compatibility implementation.

Changes

Unified unlinkat routing

Layer / File(s)	Summary
Host unlinkat helper `crates/host_env/src/posix.rs`, `crates/host_env/src/posix_unix_like.rs`	The Unix-like host environment adds `unlinkat` with an optional directory descriptor and removes the previous non-Redox wrapper.
POSIX remove integration `crates/vm/src/stdlib/posix.rs`, `crates/vm/src/stdlib/os.rs`	`remove` routes through the shared helper on all platforms. Redox now reports directory-descriptor support.
WASI remove compatibility `crates/vm/src/stdlib/posix_compat.rs`	WASI adds an `unlinkat`-based `remove` implementation. The existing implementation is restricted to non-WASI targets.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to cf87e

The localized Unix/WASI unlink behavior changes do not present an actionable merge-blocking risk in the supplied evidence, so the PR is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: using rustix for unlinkat and resolving the Clippy denial.
Docstring Coverage	✅ Passed	Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@crates/vm/src/stdlib/posix_compat.rs`:
- Line 23: Apply the existing #[cfg(not(target_os = "wasi"))] guard to the
std::fs and IntoPyException imports in posix_compat.rs, matching the guard on
the WASI-excluded remove function while leaving other imports unchanged.

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📒 Files selected for processing (4)

crates/host_env/src/posix.rs
crates/host_env/src/posix_unix_like.rs
crates/vm/src/stdlib/posix.rs
crates/vm/src/stdlib/posix_compat.rs

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crates/host_env/src/posix.rs

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Inline comments:
In `@crates/vm/src/stdlib/posix_compat.rs`:
- Around line 26-35: Guard the WASI-specific remove function with cfg(target_os
= "wasi") before its first pyfunction attribute, and adjust the IntoPyException
and std::fs imports with the complementary non-WASI cfg guards. Keep the
existing unlink behavior unchanged.

Apply the same fix in `@crates/vm/src/stdlib/posix_compat.rs` around lines 18 -
20.

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Reviewing files that changed from the base of the PR and between 9219b06 and 4b9700f.

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crates/vm/src/stdlib/os.rs
crates/vm/src/stdlib/posix_compat.rs

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Like the other patches, this greatly simplifies our unlinkat code and is overall nicer because it uses the syscall directly on Linux. As an added benefit, this commit adds WASI support and fixes a clippy deny. The old code caused clippy to complain that the WASI branch bypassed host_env for remove/unlink.

youknowone

👍

Follow up to RustPython#8591 because I figured out how to deduplicate the code. This is nicer for future patches that improve WASI support because Unix-likes and WASI can often share the same dispatch functions.

Follow up to #8591 because I figured out how to deduplicate the code. This is nicer for future patches that improve WASI support because Unix-likes and WASI can often share the same dispatch functions.

Like the other patches, this greatly simplifies our unlinkat code and is overall nicer because it uses the syscall directly on Linux. As an added benefit, this commit adds WASI support and fixes a clippy deny. The old code caused clippy to complain that the WASI branch bypassed host_env for remove/unlink.

Follow up to #8591 because I figured out how to deduplicate the code. This is nicer for future patches that improve WASI support because Unix-likes and WASI can often share the same dispatch functions.

coderabbitai Bot reviewed Aug 24, 2026

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Comment thread crates/vm/src/stdlib/posix_compat.rs

joshuamegnauth54 force-pushed the host_env-rustix-unlink branch from 9219b06 to 4b9700f Compare August 24, 2026 15:32

coderabbitai Bot reviewed Aug 24, 2026

View reviewed changes

Comment thread crates/vm/src/stdlib/posix_compat.rs

joshuamegnauth54 force-pushed the host_env-rustix-unlink branch from 4b9700f to cf87ea3 Compare August 24, 2026 15:55

youknowone approved these changes Aug 25, 2026

View reviewed changes

youknowone merged commit 696b57b into RustPython:main Aug 25, 2026
27 checks passed

joshuamegnauth54 deleted the host_env-rustix-unlink branch August 26, 2026 15:24

joshuamegnauth54 mentioned this pull request Sep 1, 2026

Dedupe Unix & WASI stdlib #8635

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host_env: rustix for unlinkat, fix clippy deny - #8591

host_env: rustix for unlinkat, fix clippy deny#8591
youknowone merged 1 commit into
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joshuamegnauth54:host_env-rustix-unlink

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joshuamegnauth54 commented Aug 24, 2026 •

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