Function access

crates/vm/src/stdlib/posix.rs:476–508

(path: OsPath, mode: u8, vm: &VirtualMachine)

    #[pyfunction]
    pub(super) fn access(path: OsPath, mode: u8, vm: &VirtualMachine) -> PyResult<bool> {
        use std::os::unix::fs::MetadataExt;

        let flags = AccessFlags::from_bits(mode).ok_or_else(|| {
            vm.new_value_error(
            "One of the flags is wrong, there are only 4 possibilities F_OK, R_OK, W_OK and X_OK",
        )
        })?;

        let metadata = match fs::metadata(&path.path) {
            Ok(m) => m,
            // If the file doesn't exist, return False for any access check
            Err(_) => return Ok(false),
        };

        // if it's only checking for F_OK
        if flags == AccessFlags::F_OK {
            return Ok(true); // File exists
        }

        let user_id = metadata.uid();
        let group_id = metadata.gid();
        let mode = metadata.mode();

        let perm = get_right_permission(mode, Uid::from_raw(user_id), Gid::from_raw(group_id))
            .map_err(|err| err.into_pyexception(vm))?;

        let r_ok = !flags.contains(AccessFlags::R_OK) || perm.is_readable;
        let w_ok = !flags.contains(AccessFlags::W_OK) || perm.is_writable;
        let x_ok = !flags.contains(AccessFlags::X_OK) || perm.is_executable;

        Ok(r_ok && w_ok && x_ok)
    }

    #[pyattr]
    fn environ(vm: &VirtualMachine) -> PyDictRef {