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windows umask, win32_xstat_slow_impl, fake EXT_SUFFIX #6340

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Merged
youknowone merged 4 commits into from
Dec 8, 2025
Merged

windows umask, win32_xstat_slow_impl, fake EXT_SUFFIX #6340

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ec50973
umask
youknowone Dec 6, 2025
8623b75
EXT_SUFFIX
youknowone Dec 6, 2025
159c978
File Attributes and win32_xstat_slow_impl
youknowone Dec 6, 2025
8317e6d
unmark tests
youknowone Dec 7, 2025
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EXT_SUFFIX
  • Loading branch information
@youknowone
youknowone committed Dec 8, 2025
commit 8623b750d6592edcf48645dbd5d2b1eee73edabd
1 change: 1 addition & 0 deletions .cspell.dict/cpython.txt
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Expand Up @@ -46,6 +46,7 @@ prec
preinitialized
PYTHREAD_NAME
SA_ONSTACK
SOABI
stackdepth
stringlib
structseq
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11 changes: 11 additions & 0 deletions crates/vm/src/stdlib/sysconfig.rs
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Expand Up @@ -7,8 +7,19 @@ pub(crate) mod sysconfig {
#[pyfunction]
fn config_vars(vm: &VirtualMachine) -> PyDictRef {
let vars = vm.ctx.new_dict();

// FIXME: This is an entirely wrong implementation of EXT_SUFFIX.
// EXT_SUFFIX must be a string starting with "." for pip compatibility
// Using ".pyd" causes pip's _generic_abi() to fall back to _cpython_abis()
vars.set_item("EXT_SUFFIX", ".pyd".to_pyobject(vm), vm)
.unwrap();
vars.set_item("SOABI", vm.ctx.none(), vm).unwrap();

vars.set_item("Py_GIL_DISABLED", true.to_pyobject(vm), vm)
.unwrap();
vars.set_item("Py_DEBUG", false.to_pyobject(vm), vm)
.unwrap();
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@coderabbitai coderabbitai Bot Dec 7, 2025

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⚠️ Potential issue | 🟠 Major

🧩 Analysis chain

🏁 Script executed:

# First, let's examine the sysconfig.rs file to see its full context
wc -l crates/vm/src/stdlib/sysconfig.rs

Repository: RustPython/RustPython

Length of output: 186

🏁 Script executed:

# Check the complete sysconfig.rs file and its module definition
cat -n crates/vm/src/stdlib/sysconfig.rs

Repository: RustPython/RustPython

Length of output: 186

🏁 Script executed:

# Search for how sysconfig is registered/loaded and any platform guards
rg -n "sysconfig" crates/vm/src/stdlib/ --type rust -B 3 -A 3

Repository: RustPython/RustPython

Length of output: 186

🏁 Script executed:

# Check for platform-specific gates on sysconfig module
rg -n "#\[cfg" crates/vm/src/stdlib/sysconfig.rs

Repository: RustPython/RustPython

Length of output: 186

🏁 Script executed:

# Search for EXT_SUFFIX usage across the codebase
rg -n "EXT_SUFFIX" crates/vm/src/ --type rust -B 2 -A 2

Repository: RustPython/RustPython

Length of output: 186

🌐 Web query:

CPython sysconfig EXT_SUFFIX platform specific Windows Unix macOS

💡 Result:

Short summary — what EXT_SUFFIX is and platform differences, and how to get it:

  • EXT_SUFFIX is the filename suffix used for compiled Python extension modules (shared objects) for the current build — e.g. on POSIX you usually get .cpython-XY... .so (includes the SOABI), on Windows you get .pyd (often with a platform/ABI tag like .cp37-win_amd64.pyd when full suffix is available). [1][2]

  • How CPython exposes it:

    • sysconfig.get_config_var('EXT_SUFFIX') — canonical API to query the extension suffix. On many Unix/macOS builds this returns the full tagged suffix (e.g. ".cpython-39m-darwin.so"). On some Windows builds it may return only ".pyd" (SOABI may be None). [2][5]
    • If you need the fuller Windows tag (e.g. ".cp37-win_amd64.pyd"), distutils.sysconfig.get_config_var('EXT_SUFFIX') historically returned the full value on Windows in some builds (useful as a fallback). Note: distutils is deprecated but still present in many Python versions; prefer sysconfig when possible. [0]

  • Practical snippet:

    • import sysconfig; ext = sysconfig.get_config_var('EXT_SUFFIX')
    • fallback (Windows): import distutils.sysconfig; ext = distutils.sysconfig.get_config_var('EXT_SUFFIX') if ext is None or ext == '.pyd' else ext. [0][1]

References:

  • Python sysconfig docs (describe get_config_var / get_platform / usage). [1][2]
  • StackOverflow discussion showing Windows behavior and distutils fallback. [0]

Sources:
[0] StackOverflow — "Python generate SOABI/Extension Suffix (pep 3149) for Windows".
[1] Python docs — sysconfig (library documentation).
[2] Python docs — Configure/using Python (notes on platform/config).

🌐 Web query:

RustPython sysconfig module EXT_SUFFIX implementation

💡 Result:

Do you want (a) the RustPython source location that implements sysconfig/EXT_SUFFIX, (b) an explanation of how EXT_SUFFIX should behave (CPython behaviour), or (c) help implementing/fixing EXT_SUFFIX in RustPython?

Hardcoded .pyd EXT_SUFFIX will break on Unix/macOS platforms.

EXT_SUFFIX must be platform-specific: Windows uses .pyd, while Unix/macOS require .cpython-XY-{platform}.so with SOABI included. The current hardcoded .pyd value will cause extension module discovery to fail on non-Windows platforms.

Ensure either:

  1. This module is Windows-only (gated with #[cfg(windows)]), or
  2. EXT_SUFFIX is set conditionally based on the target platform, with appropriate SOABI values for Unix/macOS
🤖 Prompt for AI Agents 
crates/vm/src/stdlib/sysconfig.rs lines 10-21: the code hardcodes EXT_SUFFIX to
".pyd" which is only valid on Windows and misses SOABI for Unix/macOS; change
this by gating the Windows-specific assignment behind #[cfg(windows)] (or
runtime cfg!(windows)) and for non-Windows targets set EXT_SUFFIX to a
dot-prefixed SO filename (e.g. the cpython-style suffix that includes
ABI/version and platform) and populate SOABI with the corresponding value;
ensure EXT_SUFFIX always begins with '.' for pip compatibility and
unwrap/error-handle setters as before.


vars
}
}