FBT: Close current app when flashing firmware

scripts/selfupdate.py

@@ -3,6 +3,7 @@
 import logging
 import os
 import pathlib
+import time
 
 from flipper.app import App
 from flipper.storage import FlipperStorage, FlipperStorageOperations
@@ -10,6 +11,8 @@ from flipper.utils.cdc import resolve_port
 
 
 class Main(App):
+    APP_POST_CLOSE_DELAY_SEC = 0.2
+
     def init(self):
         self.parser.add_argument("-p", "--port", help="CDC Port", default="auto")
 
@@ -48,6 +51,23 @@ class Main(App):
                     flipper_update_path, manifest_path.parents[0]
                 )
 
+                self.logger.info("Closing current app, if any")
+                for _ in range(10):
+                    storage.send_and_wait_eol("loader close\r")
+                    result = storage.read.until(storage.CLI_EOL)
+                    if b"was closed" in result:
+                        self.logger.info("App closed")
+                        storage.read.until(storage.CLI_EOL)
+                        time.sleep(self.APP_POST_CLOSE_DELAY_SEC)
+                    elif result.startswith(b"No application"):
+                        storage.read.until(storage.CLI_EOL)
+                        break
+                    else:
+                        self.logger.error(
+                            f"Unexpected response: {result.decode('ascii')}"
+                        )
+                        return 4
+
                 storage.send_and_wait_eol(
                     f"update install {flipper_update_path}/{manifest_name}\r"
                 )