Method try_load_from_python_environ

crates/stdlib/src/ssl.rs:1331–1360

Helper: Try to load certificates from Python's os.environ variables Returns true if certificates were successfully loaded. We use Python's os.environ instead of Rust's std::env because Python code can modify os.environ at runtime (e.g., `os.environ['SSL_CERT_FILE'] = '/path'`), but rustls-native-certs uses std::env which only sees the process environment at startup.

(
            &self,
            loader: &mut cert::CertLoader<'_>,
            vm: &VirtualMachine,
        )

        /// `os.environ['SSL_CERT_FILE'] = '/path'`), but rustls-native-certs uses
        /// std::env which only sees the process environment at startup.
        fn try_load_from_python_environ(
            &self,
            loader: &mut cert::CertLoader<'_>,
            vm: &VirtualMachine,
        ) -> PyResult<bool> {
            use std::path::Path;

            let os_module = vm.import("os", 0)?;
            let environ = os_module.get_attr("environ", vm)?;

            // Try SSL_CERT_FILE first
            if let Ok(cert_file) = Self::get_env_path(&environ, "SSL_CERT_FILE", vm)
                && Path::new(&cert_file).exists()
                && let Ok(stats) = loader.load_from_file(&cert_file)
            {
                self.update_cert_stats(stats);
                return Ok(true);
            }

            // Try SSL_CERT_DIR (only if SSL_CERT_FILE didn't work)
            if let Ok(cert_dir) = Self::get_env_path(&environ, "SSL_CERT_DIR", vm)
                && Path::new(&cert_dir).is_dir()
                && let Ok(stats) = loader.load_from_dir(&cert_dir)
            {
                self.update_cert_stats(stats);
                return Ok(true);
            }

            Ok(false)
        }

        /// Helper: Load system certificates using rustls-native-certs
        ///