feat: add custom env for unified exec process (#7286)

codex-rs/core/src/unified_exec/session_manager.rs

@@ -48,6 +48,24 @@ use super::session::OutputBuffer;
 use super::session::OutputHandles;
 use super::session::UnifiedExecSession;
 
+const UNIFIED_EXEC_ENV: [(&str, &str); 8] = [
+    ("NO_COLOR", "1"),
+    ("TERM", "dumb"),
+    ("LANG", "C.UTF-8"),
+    ("LC_CTYPE", "C.UTF-8"),
+    ("LC_ALL", "C.UTF-8"),
+    ("COLORTERM", ""),
+    ("PAGER", "cat"),
+    ("GIT_PAGER", "cat"),
+];
+
+fn apply_unified_exec_env(mut env: HashMap<String, String>) -> HashMap<String, String> {
+    for (key, value) in UNIFIED_EXEC_ENV {
+        env.insert(key.to_string(), value.to_string());
+    }
+    env
+}
+
 struct PreparedSessionHandles {
     writer_tx: mpsc::Sender<Vec<u8>>,
     output_buffer: OutputBuffer,
@@ -460,12 +478,13 @@ impl UnifiedExecSessionManager {
         justification: Option<String>,
         context: &UnifiedExecContext,
     ) -> Result<UnifiedExecSession, UnifiedExecError> {
+        let env = apply_unified_exec_env(create_env(&context.turn.shell_environment_policy));
         let mut orchestrator = ToolOrchestrator::new();
         let mut runtime = UnifiedExecRuntime::new(self);
         let req = UnifiedExecToolRequest::new(
             command.to_vec(),
             cwd,
-            create_env(&context.turn.shell_environment_policy),
+            env,
             with_escalated_permissions,
             justification,
             create_approval_requirement_for_command(
@@ -619,6 +638,35 @@ mod tests {
     use tokio::time::Duration;
     use tokio::time::Instant;
 
+    #[test]
+    fn unified_exec_env_injects_defaults() {
+        let env = apply_unified_exec_env(HashMap::new());
+        let expected = HashMap::from([
+            ("NO_COLOR".to_string(), "1".to_string()),
+            ("TERM".to_string(), "dumb".to_string()),
+            ("LANG".to_string(), "C.UTF-8".to_string()),
+            ("LC_CTYPE".to_string(), "C.UTF-8".to_string()),
+            ("LC_ALL".to_string(), "C.UTF-8".to_string()),
+            ("COLORTERM".to_string(), String::new()),
+            ("PAGER".to_string(), "cat".to_string()),
+            ("GIT_PAGER".to_string(), "cat".to_string()),
+        ]);
+
+        assert_eq!(env, expected);
+    }
+
+    #[test]
+    fn unified_exec_env_overrides_existing_values() {
+        let mut base = HashMap::new();
+        base.insert("NO_COLOR".to_string(), "0".to_string());
+        base.insert("PATH".to_string(), "/usr/bin".to_string());
+
+        let env = apply_unified_exec_env(base);
+
+        assert_eq!(env.get("NO_COLOR"), Some(&"1".to_string()));
+        assert_eq!(env.get("PATH"), Some(&"/usr/bin".to_string()));
+    }
+
     #[test]
     fn pruning_prefers_exited_sessions_outside_recently_used() {
         let now = Instant::now();