log sandbox commands to $CODEX_HOME instead of cwd (#6171)

Logging commands in the Windows Sandbox is temporary, but while we are
doing it, let's always write to CODEX_HOME instead of dirtying the cwd.

codex-rs/cli/src/debug_sandbox.rs

@@ -124,6 +124,7 @@ async fn run_command_under_sandbox(
             let cwd_clone = cwd.clone();
             let env_map = env.clone();
             let command_vec = command.clone();
+            let base_dir = config.codex_home.clone();
             let res = tokio::task::spawn_blocking(move || {
                 run_windows_sandbox_capture(
                     policy_str,
@@ -132,6 +133,7 @@ async fn run_command_under_sandbox(
                     &cwd_clone,
                     env_map,
                     None,
+                    Some(base_dir.as_path()),
                 )
             })
             .await;

codex-rs/core/src/exec.rs

@@ -171,6 +171,7 @@ async fn exec_windows_sandbox(
     params: ExecParams,
     sandbox_policy: &SandboxPolicy,
 ) -> Result<RawExecToolCallOutput> {
+    use crate::config::find_codex_home;
     use codex_windows_sandbox::run_windows_sandbox_capture;
 
     let ExecParams {
@@ -188,8 +189,17 @@ async fn exec_windows_sandbox(
     };
 
     let sandbox_cwd = cwd.clone();
+    let logs_base_dir = find_codex_home().ok();
     let spawn_res = tokio::task::spawn_blocking(move || {
-        run_windows_sandbox_capture(policy_str, &sandbox_cwd, command, &cwd, env, timeout_ms)
+        run_windows_sandbox_capture(
+            policy_str,
+            &sandbox_cwd,
+            command,
+            &cwd,
+            env,
+            timeout_ms,
+            logs_base_dir.as_deref(),
+        )
     })
     .await;
 

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

@@ -182,6 +182,7 @@ mod windows_impl {
         cwd: &Path,
         mut env_map: HashMap<String, String>,
         timeout_ms: Option<u64>,
+        logs_base_dir: Option<&Path>,
     ) -> Result<CaptureResult> {
         let policy = SandboxPolicy::parse(policy_json_or_preset)?;
         normalize_null_device_env(&mut env_map);
@@ -191,7 +192,7 @@ mod windows_impl {
         let current_dir = cwd.to_path_buf();
         // for now, don't fail if we detect world-writable directories
         // audit::audit_everyone_writable(&current_dir, &env_map)?;
-        log_start(&command);
+        log_start(&command, logs_base_dir);
         let (h_token, psid_to_use): (HANDLE, *mut c_void) = unsafe {
             match &policy.0 {
                 SandboxMode::ReadOnly => {
@@ -295,7 +296,7 @@ mod windows_impl {
                 env_block.len(),
                 si.dwFlags,
             );
-            debug_log(&dbg);
+            debug_log(&dbg, logs_base_dir);
             unsafe {
                 CloseHandle(in_r);
                 CloseHandle(in_w);
@@ -395,9 +396,9 @@ mod windows_impl {
         };
 
         if exit_code == 0 {
-            log_success(&command);
+            log_success(&command, logs_base_dir);
         } else {
-            log_failure(&command, &format!("exit code {}", exit_code));
+            log_failure(&command, &format!("exit code {}", exit_code), logs_base_dir);
         }
 
         if !persist_aces {
@@ -446,6 +447,7 @@ mod stub {
         _cwd: &Path,
         _env_map: HashMap<String, String>,
         _timeout_ms: Option<u64>,
+        _logs_base_dir: Option<&Path>,
     ) -> Result<CaptureResult> {
         bail!("Windows sandbox is only available on Windows")
     }

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

@@ -1,5 +1,7 @@
 use std::fs::OpenOptions;
 use std::io::Write;
+use std::path::Path;
+use std::path::PathBuf;
 
 const LOG_COMMAND_PREVIEW_LIMIT: usize = 200;
 pub const LOG_FILE_NAME: &str = "sandbox_commands.rust.log";
@@ -13,35 +15,43 @@ fn preview(command: &[String]) -> String {
     }
 }
 
-fn append_line(line: &str) {
-    if let Ok(mut f) = OpenOptions::new()
-        .create(true)
-        .append(true)
-        .open(LOG_FILE_NAME)
-    {
-        let _ = writeln!(f, "{}", line);
+fn log_file_path(base_dir: &Path) -> Option<PathBuf> {
+    if base_dir.is_dir() {
+        Some(base_dir.join(LOG_FILE_NAME))
+    } else {
+        None
     }
 }
 
-pub fn log_start(command: &[String]) {
-    let p = preview(command);
-    append_line(&format!("START: {}", p));
+fn append_line(line: &str, base_dir: Option<&Path>) {
+    if let Some(dir) = base_dir {
+        if let Some(path) = log_file_path(dir) {
+            if let Ok(mut f) = OpenOptions::new().create(true).append(true).open(path) {
+                let _ = writeln!(f, "{}", line);
+            }
+        }
+    }
 }
 
-pub fn log_success(command: &[String]) {
+pub fn log_start(command: &[String], base_dir: Option<&Path>) {
     let p = preview(command);
-    append_line(&format!("SUCCESS: {}", p));
+    append_line(&format!("START: {p}"), base_dir);
 }
 
-pub fn log_failure(command: &[String], detail: &str) {
+pub fn log_success(command: &[String], base_dir: Option<&Path>) {
     let p = preview(command);
-    append_line(&format!("FAILURE: {} ({})", p, detail));
+    append_line(&format!("SUCCESS: {p}"), base_dir);
+}
+
+pub fn log_failure(command: &[String], detail: &str, base_dir: Option<&Path>) {
+    let p = preview(command);
+    append_line(&format!("FAILURE: {p} ({detail})"), base_dir);
 }
 
 // Debug logging helper. Emits only when SBX_DEBUG=1 to avoid noisy logs.
-pub fn debug_log(msg: &str) {
+pub fn debug_log(msg: &str, base_dir: Option<&Path>) {
     if std::env::var("SBX_DEBUG").ok().as_deref() == Some("1") {
-        append_line(&format!("DEBUG: {}", msg));
-        eprintln!("{}", msg);
+        append_line(&format!("DEBUG: {msg}"), base_dir);
+        eprintln!("{msg}");
     }
 }

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

@@ -101,6 +101,7 @@ pub unsafe fn create_process_as_user(
     argv: &[String],
     cwd: &Path,
     env_map: &HashMap<String, String>,
+    logs_base_dir: Option<&Path>,
 ) -> Result<(PROCESS_INFORMATION, STARTUPINFOW)> {
     let cmdline_str = argv
         .iter()
@@ -142,7 +143,7 @@ pub unsafe fn create_process_as_user(
             env_block.len(),
             si.dwFlags,
         );
-        logging::debug_log(&msg);
+        logging::debug_log(&msg, logs_base_dir);
         return Err(anyhow!("CreateProcessAsUserW failed: {}", err));
     }
     Ok((pi, si))