host_env: Simplify stat, fstatat with Rustix by joshuamegnauth54 · Pull Request #8455 · RustPython/RustPython · GitHub

According to POSIX, time_t should be 64 bits. musl changed its time_t to an i64 over five years ago. glibc provides compatibility features that declare time_t as either i32 or i64. Rustix uses the raw Linux syscall for stat which returns an i64. For our purposes, an i64 makes sense because it's modern and avoids the year 2038 problem. It also reduces our dependency on what libc defines.

Sources:

Closes #xxxx
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Summary

Summary by CodeRabbit

Bug Fixes
- Improved file and directory metadata handling across Unix-like platforms.
- Preserved accurate directory detection and symbolic-link behavior.
- Improved error handling for file status operations.
- Standardized timestamp and filesystem block metadata for more reliable results.
Refactor
- Unified filesystem status operations across supported Unix-like environments.
- Improved compatibility across Unix-like and WASI platforms while preserving Windows behavior.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1c7759c and 29ee814.

📒 Files selected for processing (6)

crates/host_env/src/fileutils.rs
crates/host_env/src/io.rs
crates/host_env/src/posix.rs
crates/host_env/src/posix_unix_like.rs
crates/host_env/src/posix_wasi.rs
crates/vm/src/stdlib/os.rs

💤 Files with no reviewable changes (2)

crates/host_env/src/posix_wasi.rs
crates/host_env/src/posix.rs

🚧 Files skipped from review as they are similar to previous changes (3)

crates/host_env/src/fileutils.rs
crates/vm/src/stdlib/os.rs
crates/host_env/src/io.rs

📝 Walkthrough

Walkthrough

The change replaces non-Windows libc stat operations with Rustix, moves stat_path to the Unix-like implementation, updates VM path-stat wiring, and normalizes timestamp and filesystem block fields.

Changes

Filesystem stat migration

Layer / File(s)	Summary
Rustix stat primitives crates/host_env/src/fileutils.rs, crates/host_env/src/io.rs	Non-Windows stat structures, file descriptor stat calls, directory detection, and ISDIR errors now use Rustix.
Path stat implementation and wiring crates/host_env/src/posix_unix_like.rs, crates/host_env/src/posix.rs, crates/host_env/src/posix_wasi.rs, crates/vm/src/stdlib/os.rs	Unix-like stat_path now uses Rustix statat. The previous platform implementations are removed. stat_inner passes OsPath directly and uses DirFd::get_opt().
Stat result normalization crates/vm/src/stdlib/os.rs	Timestamp fields use i64. Filesystem block fields use u64. NetBSD uses the shared timestamp extraction path. Block conversions use fallback values.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

RustPython/RustPython#7035: Updates related host_env filesystem and Rustix OS error handling.
RustPython/RustPython#7604: Refines the host_env stat APIs and stat_path implementation.
RustPython/RustPython#7932: Isolates platform-specific filesystem and stat APIs in host_env.

Suggested reviewers: youknowone

🚥 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 describes the main change: simplifying stat and fstatat handling in host_env with Rustix.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
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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Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/host_env/src/fileutils.rs`:
- Line 5: Update the NetBSD branch in the OS stdlib implementation to access
StatStruct fields st_atime_nsec, st_mtime_nsec, and st_ctime_nsec, replacing the
legacy st_atimensec, st_mtimensec, and st_ctimensec names while preserving the
existing timestamp behavior.

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📒 Files selected for processing (6)

crates/host_env/src/fileutils.rs
crates/host_env/src/io.rs
crates/host_env/src/posix.rs
crates/host_env/src/posix_unix_like.rs
crates/host_env/src/posix_wasi.rs
crates/vm/src/stdlib/os.rs

💤 Files with no reviewable changes (2)

crates/host_env/src/posix_wasi.rs
crates/host_env/src/posix.rs

as always, great finding!

ty<3

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@crates/vm/src/stdlib/os.rs`:
- Around line 1237-1243: Fix the conditional compilation around the timestamp
assignments in the enclosing function by making the NetBSD condition consistent
across both adjacent cfg attributes. Remove NetBSD from the exclusion in the
second cfg so atime, mtime, and ctime are assigned for NetBSD while retaining
the existing WASI exclusion.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1c7759c and 71d5994.

📒 Files selected for processing (6)

crates/host_env/src/fileutils.rs
crates/host_env/src/io.rs
crates/host_env/src/posix.rs
crates/host_env/src/posix_unix_like.rs
crates/host_env/src/posix_wasi.rs
crates/vm/src/stdlib/os.rs

💤 Files with no reviewable changes (2)

crates/host_env/src/posix.rs
crates/host_env/src/posix_wasi.rs

🚧 Files skipped from review as they are similar to previous changes (3)

crates/host_env/src/posix_unix_like.rs
crates/host_env/src/fileutils.rs
crates/host_env/src/io.rs

Note

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According to POSIX, `time_t` should be 64 bits. `musl` changed its `time_t` to an `i64` over five years ago. `glibc` provides compatibility features that declare `time_t` as either `i32` or `i64`. Rustix uses the raw Linux syscall for stat which returns an `i64`. For our purposes, an `i64` makes sense because it's modern and avoids the year 2038 problem. It also reduces our dependency on what `libc` defines. Sources: * https://www.man7.org/linux/man-pages/man3/time_t.3type.html * https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_types.h.html

Note

GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer.

Cargo shear failed randomly. 🤔

Cargo shear failed randomly. 🤔

@ShaharNaveh

Thanks, I wish we didn't lose CPython compatible behavior by this

According to POSIX, `time_t` should be 64 bits. `musl` changed its `time_t` to an `i64` over five years ago. `glibc` provides compatibility features that declare `time_t` as either `i32` or `i64`. Rustix uses the raw Linux syscall for stat which returns an `i64`. For our purposes, an `i64` makes sense because it's modern and avoids the year 2038 problem. It also reduces our dependency on what `libc` defines. Sources: * https://www.man7.org/linux/man-pages/man3/time_t.3type.html * https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_types.h.html

joshuamegnauth54 marked this pull request as ready for review August 5, 2026 02:36

coderabbitai Bot reviewed Aug 5, 2026

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Comment thread crates/host_env/src/fileutils.rs

joshuamegnauth54 marked this pull request as draft August 5, 2026 02:46

ShaharNaveh approved these changes Aug 5, 2026

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joshuamegnauth54 force-pushed the host_env-simplify-fstatat branch from b08a96b to 1c5a481 Compare August 6, 2026 02:44

joshuamegnauth54 marked this pull request as ready for review August 6, 2026 19:00

joshuamegnauth54 force-pushed the host_env-simplify-fstatat branch from 1c5a481 to 71d5994 Compare August 6, 2026 19:00

coderabbitai Bot reviewed Aug 6, 2026

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Comment thread crates/vm/src/stdlib/os.rs Outdated

joshuamegnauth54 force-pushed the host_env-simplify-fstatat branch from 71d5994 to 62419ec Compare August 6, 2026 19:10

joshuamegnauth54 force-pushed the host_env-simplify-fstatat branch from 62419ec to 29ee814 Compare August 7, 2026 02:52

youknowone approved these changes Aug 8, 2026

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youknowone merged commit 1819677 into RustPython:main Aug 8, 2026
51 of 52 checks passed

joshuamegnauth54 deleted the host_env-simplify-fstatat branch August 8, 2026 18:17

host_env: Simplify stat, fstatat with Rustix by joshuamegnauth54 · Pull Request #8455 · RustPython/RustPython · GitHub

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host_env: Simplify stat, fstatat with Rustix - #8455

host_env: Simplify stat, fstatat with Rustix#8455
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host_env: Simplify stat, fstatat with Rustix by joshuamegnauth54 · Pull Request #8455 · RustPython/RustPython · GitHub

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host_env: Simplify stat, fstatat with Rustix#8455youknowone merged 1 commit intoRustPython:mainRustPython/RustPython:mainfrom joshuamegnauth54:host_env-simplify-fstatatjoshuamegnauth54/RustPython:host_env-simplify-fstatatCopy head branch name to clipboard

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