1 files changed, 27 insertions, 0 deletions
diff --git a/app/backends/qwen.py b/app/backends/qwen.py
index b2a1df4..4f3afd9 100644
--- a/app/backends/qwen.py
+++ b/app/backends/qwen.py
@@ -457,6 +457,33 @@ def uninstall(*, emit=None, cancel=None) -> int:
     return rc
 
 
+def update(*, emit=None, cancel=None) -> int:
+    """Update the qwen-tts backend: pip install -U qwen-tts in its venv.
+
+    A managed server that is running is stopped first (best-effort): it
+    imports ``qwen_tts`` from the very venv being upgraded, so an in-place
+    upgrade under a live process would leave it serving stale code.
+    CANCEL is a ``threading.Event`` honored between phases only (stop
+    server / pip) — a started phase always completes, so pip is never
+    killed mid-run. pip itself is the freshness check: it resolves the
+    latest version, upgrades when there is one, and reports "Requirement
+    already satisfied" otherwise. Returns the exit code (130 when
+    cancelled before a remaining phase).
+    """
+    if servers.pid_for("qwen") is not None:
+        servers.stop("qwen")
+    if common.cancel_requested(cancel):
+        return 130
+    rc = common.pip_install([QWEN_PIP_PKG], emit=emit, cancel=cancel,
+                            env_dir=QWEN_ENV, upgrade=True)
+    if rc != 0:
+        print(f"[WARNING] pip install -U failed (exit {rc}); update "
+              f"{QWEN_PIP_PKG} manually")
+    else:
+        print(f"[OK] {QWEN_PIP_PKG} is up to date (or just upgraded).")
+    return rc
+
+
 def models_screen(stdscr) -> int:
     """Per-model (un)install screen: the hub's Configure-qwen-tts leaf.