Use read-only remote cwd predicate

codex-rs/core/tests/suite/remote_env.rs

@@ -250,20 +250,17 @@ async fn remote_test_env_exposes_target_shell_to_model() -> Result<()> {
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn compatible_remote_path_hint_uses_environment_shell_in_remote_cwd() -> Result<()> {
     const CALL_ID: &str = "remote-explicit-shell";
-    const CWD_MARKER: &str = "remote-shell-cwd.txt";
 
     skip_if_no_remote_env!(Ok(()));
 
-    let (shell, command, expected_cwd_prefix) = match test_target_os() {
+    let (shell, command) = match test_target_os() {
         TestTargetOs::Linux => (
             "/attacker/bash",
-            format!("pwd > {CWD_MARKER}"),
-            "/tmp/codex-core-test-cwd-",
+            r#"case "$PWD" in /tmp/codex-core-test-cwd-*) exit 0 ;; *) exit 42 ;; esac"#,
         ),
         TestTargetOs::Windows => (
             r"C:\attacker\PowerShell.ExE",
-            format!("[System.IO.File]::WriteAllText('{CWD_MARKER}', (Get-Location).Path)"),
-            r"C:\codex-core-test-cwd-",
+            r"if ((Get-Location).Path -like 'C:\codex-core-test-cwd-*') { exit 0 } else { exit 42 }",
         ),
         TestTargetOs::MacOs => unreachable!("remote test targets do not run macOS"),
     };
@@ -319,29 +316,8 @@ async fn compatible_remote_path_hint_uses_environment_shell_in_remote_cwd() -> R
     let output = output.context("remote shell command should return output")?;
     assert!(
         output.contains("Process exited with code 0"),
-        "remote shell command should exit successfully: {output}",
+        "remote environment shell should run in the selected remote cwd: {output}",
     );
-    let marker_path = test
-        .executor_environment()
-        .selection()
-        .cwd
-        .join(CWD_MARKER)?;
-    let cwd_bytes = test.fs().read_file(&marker_path, /*sandbox*/ None).await?;
-    let actual_cwd = String::from_utf8(cwd_bytes).context("remote cwd marker should be UTF-8")?;
-    assert!(
-        actual_cwd.starts_with(expected_cwd_prefix),
-        "remote shell command should run in the remote cwd: {actual_cwd:?}",
-    );
-    test.fs()
-        .remove(
-            &marker_path,
-            RemoveOptions {
-                recursive: false,
-                force: true,
-            },
-            /*sandbox*/ None,
-        )
-        .await?;
 
     Ok(())
 }