Fix rust build on windows (#2019)

This pull request implements a fix from #2000, as well as fixed an
additional problem with path lengths on windows that prevents the login
from displaying.

---------

Co-authored-by: Michael Bolin <bolinfest@gmail.com>
Co-authored-by: Michael Bolin <mbolin@openai.com>

codex-rs/login/src/lib.rs

@@ -18,6 +18,7 @@ use std::process::Stdio;
 use std::sync::Arc;
 use std::sync::Mutex;
 use std::time::Duration;
+use tempfile::NamedTempFile;
 use tokio::process::Command;
 
 pub use crate::token_data::TokenData;
@@ -263,9 +264,9 @@ pub struct SpawnedLogin {
 
 /// Spawn the ChatGPT login Python server as a child process and return a handle to its process.
 pub fn spawn_login_with_chatgpt(codex_home: &Path) -> std::io::Result<SpawnedLogin> {
+    let script_path = write_login_script_to_disk()?;
     let mut cmd = std::process::Command::new("python3");
-    cmd.arg("-c")
-        .arg(SOURCE_FOR_PYTHON_SERVER)
+    cmd.arg(&script_path)
         .env("CODEX_HOME", codex_home)
         .env("CODEX_CLIENT_ID", CLIENT_ID)
         .stdin(Stdio::null())
@@ -315,9 +316,9 @@ pub fn spawn_login_with_chatgpt(codex_home: &Path) -> std::io::Result<SpawnedLog
 /// recorded in memory. Otherwise, the subprocess's output will be sent to the
 /// current process's stdout/stderr.
 pub async fn login_with_chatgpt(codex_home: &Path, capture_output: bool) -> std::io::Result<()> {
+    let script_path = write_login_script_to_disk()?;
     let child = Command::new("python3")
-        .arg("-c")
-        .arg(SOURCE_FOR_PYTHON_SERVER)
+        .arg(&script_path)
         .env("CODEX_HOME", codex_home)
         .env("CODEX_CLIENT_ID", CLIENT_ID)
         .stdin(Stdio::null())
@@ -344,6 +345,17 @@ pub async fn login_with_chatgpt(codex_home: &Path, capture_output: bool) -> std:
     }
 }
 
+fn write_login_script_to_disk() -> std::io::Result<PathBuf> {
+    // Write the embedded Python script to a file to avoid very long
+    // command-line arguments (Windows error 206).
+    let mut tmp = NamedTempFile::new()?;
+    tmp.write_all(SOURCE_FOR_PYTHON_SERVER.as_bytes())?;
+    tmp.flush()?;
+
+    let (_file, path) = tmp.keep()?;
+    Ok(path)
+}
+
 pub fn login_with_api_key(codex_home: &Path, api_key: &str) -> std::io::Result<()> {
     let auth_dot_json = AuthDotJson {
         openai_api_key: Some(api_key.to_string()),