Fix Windows sandbox setup helper resolution

codex-rs/windows-sandbox-rs/src/helper_materialization.rs

@@ -22,18 +22,21 @@ pub(crate) const RESOURCES_DIRNAME: &str = "codex-resources";
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub(crate) enum HelperExecutable {
     CommandRunner,
+    Setup,
 }
 
 impl HelperExecutable {
     fn file_name(self) -> &'static str {
         match self {
             Self::CommandRunner => "codex-command-runner.exe",
+            Self::Setup => "codex-windows-sandbox-setup.exe",
         }
     }
 
     fn label(self) -> &'static str {
         match self {
             Self::CommandRunner => "command-runner",
+            Self::Setup => "setup-helper",
         }
     }
 }
@@ -458,6 +461,30 @@ mod tests {
         );
     }
 
+    #[test]
+    fn copy_setup_helper_into_shared_bin_dir() {
+        let tmp = TempDir::new().expect("tempdir");
+        let codex_home = tmp.path().join("codex-home");
+        let source_dir = tmp.path().join("sibling-source");
+        fs::create_dir_all(&source_dir).expect("create source dir");
+        let setup_source = source_dir.join("codex-windows-sandbox-setup.exe");
+        fs::write(&setup_source, b"setup").expect("setup");
+        let setup_suffix = helper_version_suffix(&setup_source).expect("setup suffix");
+        let setup_destination = helper_bin_dir(&codex_home).join(materialized_file_name(
+            HelperExecutable::Setup,
+            &setup_suffix,
+        ));
+
+        let setup_outcome =
+            copy_from_source_if_needed(&setup_source, &setup_destination).expect("setup copy");
+
+        assert_eq!(CopyOutcome::ReCopied, setup_outcome);
+        assert_eq!(
+            b"setup".as_slice(),
+            fs::read(&setup_destination).expect("read setup")
+        );
+    }
+
     #[test]
     fn helper_source_lookup_checks_resource_dir() {
         let tmp = TempDir::new().expect("tempdir");
@@ -559,4 +586,11 @@ mod tests {
 
         assert_eq!(file_name, "codex-command-runner-test-suffix.exe");
     }
+
+    #[test]
+    fn materialized_setup_file_name_adds_suffix_before_extension() {
+        let file_name = materialized_file_name(HelperExecutable::Setup, "test-suffix");
+
+        assert_eq!(file_name, "codex-windows-sandbox-setup-test-suffix.exe");
+    }
 }

codex-rs/windows-sandbox-rs/src/setup.rs

@@ -13,6 +13,8 @@ use std::process::Stdio;
 use crate::allow::AllowDenyPaths;
 use crate::allow::compute_allow_paths_for_permissions;
 use crate::helper_materialization::bundled_executable_path_for_exe;
+use crate::helper_materialization::resolve_helper_for_launch;
+use crate::helper_materialization::HelperExecutable;
 use crate::helper_materialization::helper_bin_dir;
 use crate::identity::sandbox_setup_is_complete;
 use crate::logging::current_log_file_path;
@@ -209,7 +211,7 @@ fn run_setup_refresh_inner(
     };
     let json = serde_json::to_vec(&payload)?;
     let b64 = BASE64_STANDARD.encode(json);
-    let exe = find_setup_exe();
+    let exe = find_setup_exe(request.codex_home);
     let sbx_dir = sandbox_dir(request.codex_home);
     let log_path = current_log_file_path(&sbx_dir);
     let cleared_report = match clear_setup_error_report(request.codex_home) {
@@ -662,13 +664,12 @@ fn quote_arg(arg: &str) -> String {
     out
 }
 
-fn find_setup_exe() -> PathBuf {
-    if let Ok(exe) = std::env::current_exe()
-        && let Some(setup_exe) = find_setup_exe_for_current_exe(&exe)
-    {
-        return setup_exe;
-    }
-    PathBuf::from(SETUP_EXE_FILENAME)
+fn find_setup_exe(codex_home: &Path) -> PathBuf {
+    resolve_helper_for_launch(
+        HelperExecutable::Setup,
+        codex_home,
+        Some(&sandbox_dir(codex_home)),
+    )
 }
 
 fn find_setup_exe_for_current_exe(exe: &Path) -> Option<PathBuf> {
@@ -716,7 +717,7 @@ fn run_setup_exe(
     use windows_sys::Win32::UI::Shell::SEE_MASK_NOCLOSEPROCESS;
     use windows_sys::Win32::UI::Shell::SHELLEXECUTEINFOW;
     use windows_sys::Win32::UI::Shell::ShellExecuteExW;
-    let exe = find_setup_exe();
+    let exe = find_setup_exe(codex_home);
     let payload_json = serde_json::to_string(payload).map_err(|err| {
         failure(
             SetupErrorCode::OrchestratorPayloadSerializeFailed,