Fix Check Point Gaia double command echo issue (#3742)

* Fix Check Point gaia double command echo issue

* Fixing linter

* Linting #2

Author: ktbyers

netmiko/checkpoint/checkpoint_gaia_ssh.py

@@ -1,3 +1,6 @@
+import time
+import re
+
 from netmiko.no_config import NoConfig
 from netmiko.base_connection import BaseConnection
 
@@ -8,16 +11,43 @@ class CheckPointGaiaSSH(NoConfig, BaseConnection):
     firewalls.
     """
 
+    prompt_pattern = r"[>#]"
+
     def session_preparation(self) -> None:
         """
         Prepare the session after the connection has been established.
 
         Set the base prompt for interaction ('>').
         """
-        self._test_channel_read(pattern=r"[>#]")
+        self._test_channel_read(pattern=self.prompt_pattern)
         self.set_base_prompt()
         self.disable_paging(command="set clienv rows 0")
 
+        # Clear read buffer
+        time.sleep(0.3 * self.global_delay_factor)
+        self.clear_buffer()
+
+    def command_echo_read(self, cmd: str, read_timeout: float) -> str:
+        """Check Point clish double echoes the command (at least sometimes)"""
+
+        re_cmd = re.escape(cmd)
+        pattern = rf"{self.prompt_pattern}\s{re_cmd}"
+
+        # Make sure you read until you detect the command echo (avoid getting out of sync)
+        new_data = self.read_until_pattern(pattern=pattern, read_timeout=read_timeout)
+
+        # There can be echoed prompts that haven't been cleared before the cmd echo
+        # this can later mess up the trailing prompt pattern detection. Clear this out.
+        lines = new_data.split(cmd)
+        if len(lines) in [2, 3]:
+            # lines[-1] should realistically just be the null string
+            new_data = f"{cmd}{lines[-1]}"
+        else:
+            # cmd exists in the output multiple times? Just retain the original output
+            pass
+
+        return new_data
+
     def save_config(
         self, cmd: str = "", confirm: bool = False, confirm_response: str = ""
     ) -> str: