typing extra "#" to not re-execute old commands

we send "\n" before every command to make sure we have a clean prompt. But in doing so we mistakenly re-execute the previous command. That seems ot be the unfortunate u-boot shell behavior. Let's type "#\n" that "runs" an empty command that doesn't do anything and has the same clean prompt response we want.

Author: michalskrivanek

packages/jumpstarter-driver-uboot/jumpstarter_driver_uboot/client.py

@@ -71,7 +71,7 @@ def run_command(self, cmd: str, timeout: int = 60, *, _internal_log=True) -> byt
             self.logger.info(f"Running command: {cmd}")
         if not hasattr(self, "p"):
             raise RuntimeError("Not in a reboot_to_console context")
-        self.p.sendline("")
+        self.p.sendline("#") # just sending "\n" re-executes the last command. "#" should be a harmless no-op
         self.p.expect_exact(self.prompt, timeout=timeout)
         self.p.sendline(cmd)
         self.p.expect_exact(self.prompt, timeout=timeout)