feat: live update log in UI and suppress lifecycle Telegram during SAC update

Poll remote update_script.log while SSH update runs; skip lifecycle notify
when host agent_update_state is running (SAC v0.5.1).

backend/app/services/host_remote_actions.py

@@ -16,7 +16,7 @@ from app.services.agent_update import execute_agent_update_fallback
 from app.services.agent_update_types import AgentUpdateFallbackResult
 from app.services.linux_admin_settings import get_effective_linux_admin_config
 from app.services.agent_update_settings import get_effective_agent_update_config
-from app.services.ssh_connect import iter_ssh_targets, run_ssh_monitor_update, SshCommandResult
+from app.services.ssh_connect import iter_ssh_targets, run_ssh_monitor_update, SshCommandResult, tail_ssh_monitor_update_log
 
 logger = logging.getLogger(__name__)
 
@@ -113,12 +113,61 @@ def _apply_ssh_update_result(db: Session, host: Host, result: SshCommandResult)
         host.agent_update_last_error = (result.message or "SSH update failed")[:2000]
 
 
+_REMOTE_LOG_POLL_SEC = 2.0
+
+
+def _poll_ssh_update_log_loop(
+    host_id: int,
+    *,
+    stop: threading.Event,
+) -> None:
+    """Периодически подтягивает tail update_script.log в hosts.remote_action для UI."""
+    while not stop.wait(_REMOTE_LOG_POLL_SEC):
+        session = SessionLocal()
+        try:
+            row = session.get(Host, host_id)
+            if row is None or row.agent_update_state != "running":
+                continue
+            cfg = get_effective_linux_admin_config(session)
+            if not cfg.configured:
+                continue
+            try:
+                targets = iter_ssh_targets(row)
+            except Exception:
+                continue
+            tail = ""
+            for target in targets:
+                try:
+                    tail = tail_ssh_monitor_update_log(
+                        target=target,
+                        user=cfg.user,
+                        password=cfg.password,
+                    )
+                except Exception:
+                    logger.debug("update log tail failed host_id=%s target=%s", host_id, target, exc_info=True)
+                    continue
+                if tail:
+                    break
+            payload = dict(row.remote_action or {})
+            if tail:
+                payload["output"] = tail
+                payload["message"] = "Выполняется обновление… (лог с хоста)"
+            row.remote_action = payload
+            session.commit()
+        except Exception:
+            logger.debug("remote log poll failed host_id=%s", host_id, exc_info=True)
+            session.rollback()
+        finally:
+            session.close()
+
+
 def start_host_remote_action(
     db: Session,
     host: Host,
     *,
     title: str,
     runner: ActionRunner,
+    poll_remote_log: bool = False,
 ) -> dict[str, Any]:
     host_id = int(host.id)
     with _lock:
@@ -133,6 +182,17 @@ def start_host_remote_action(
 
     def _worker() -> None:
         session = SessionLocal()
+        stop_poll = threading.Event()
+        poll_thread: threading.Thread | None = None
+        if poll_remote_log and runner is run_ssh_monitor_update_action:
+            poll_thread = threading.Thread(
+                target=_poll_ssh_update_log_loop,
+                args=(host_id,),
+                kwargs={"stop": stop_poll},
+                name=f"sac-remote-log-{host_id}",
+                daemon=True,
+            )
+            poll_thread.start()
         try:
             row = session.get(Host, host_id)
             if row is None:
@@ -167,6 +227,9 @@ def start_host_remote_action(
                 }
                 session.commit()
         finally:
+            stop_poll.set()
+            if poll_thread is not None:
+                poll_thread.join(timeout=5.0)
             session.close()
             with _lock:
                 _running.discard(host_id)