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Fix stat module compilation for Redox OS by willnode · Pull Request #5857 · RustPython/RustPython

moreal

Walkthrough

The conditional compilation logic for the S_IWRITE and S_IEXEC constants in stat.rs was updated to explicitly exclude the Redox operating system from the Unix-specific branch. This ensures that Redox uses fallback octal values for these constants instead of relying on potentially unavailable libc values.

Changes

File(s) Change Summary
vm/src/stdlib/stat.rs Updated conditional compilation for S_IWRITE and S_IEXEC to exclude Redox from Unix branch.

Sequence Diagram(s)

sequenceDiagram
    participant RustPython
    participant OS

    RustPython->>OS: Detect target_os
    alt Unix and not Android and not Redox
        RustPython->>stat.rs: Use libc S_IWRITE/S_IEXEC
    else Android or not Unix or Redox
        RustPython->>stat.rs: Use fallback octal values (0o0200, 0o0100)
    end
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Assessment against linked issues

Objective Addressed Explanation
Avoid use of obsolete S_IWRITE and S_IEXEC on Redox OS (#5856) ✅
Ensure Redox uses fallback values for S_IWRITE and S_IEXEC (#5856) ✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes were found.

Poem

In the warren where the code does grow,
A Redox rabbit hopped to and fro.
"No more old constants!" it did decree,
Now octal values set us free.
With every hop, a bug erased—
RustPython’s stat is now well-placed!
🐇✨

📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 2bd5212 and 02eb1bd.

📒 Files selected for processing (1)
  • vm/src/stdlib/stat.rs (2 hunks)
🧰 Additional context used
🧠 Learnings (2)
📓 Common learnings 
Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.770Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration using #ifdef checks rather than providing fallback values for other platforms.

Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.770Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration rather than providing fallback values for other platforms.

Learnt from: CR
PR: RustPython/RustPython#0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-06-26T12:52:11.109Z
Learning: Minimize modifications to CPython standard library files in the Lib/ directory; bug fixes should be made through Rust code modifications whenever possible.
vm/src/stdlib/stat.rs (3) 
Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.770Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration using #ifdef checks rather than providing fallback values for other platforms.

Learnt from: moreal
PR: RustPython/RustPython#5847
File: vm/src/stdlib/stat.rs:547-567
Timestamp: 2025-06-27T14:47:28.770Z
Learning: In RustPython's stat module implementation, platform-specific constants like SF_SUPPORTED and SF_SYNTHETIC should be conditionally declared only for the platforms where they're available (e.g., macOS), following CPython's approach of optional declaration rather than providing fallback values for other platforms.

Learnt from: CR
PR: RustPython/RustPython#0
File: .github/copilot-instructions.md:0-0
Timestamp: 2025-06-26T12:52:11.109Z
Learning: Minimize modifications to CPython standard library files in the Lib/ directory; bug fixes should be made through Rust code modifications whenever possible.
🔇 Additional comments (2)
vm/src/stdlib/stat.rs (2)

135-140: Redox correctly excluded for S_IWRITE – change is sound

libc on Redox does not expose S_IWRITE, so falling back to the octal literal is the right fix and mirrors what we already do for Android. No functional or stylistic issues spotted.

149-154: Same-pattern fix for S_IEXEC looks good

Consistent with the previous hunk: Redox now uses the fallback value because libc lacks S_IEXEC. Implementation matches CPython behaviour for platforms without the constant.

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