[py]: debug log the service executable and pid

Author: symonk

py/selenium/webdriver/common/service.py

@@ -90,7 +90,7 @@ def start(self) -> None:
         try:
             cmd = [self.path]
             cmd.extend(self.command_line_args())
-            self.process = subprocess.Popen(
+            child_process = self.process = subprocess.Popen(
                 cmd,
                 env=self.env,
                 close_fds=system() != "Windows",
@@ -99,6 +99,7 @@ def start(self) -> None:
                 stdin=PIPE,
                 creationflags=self.creation_flags,
             )
+            log.debug(f"Started executable: `{self.process}` in a child process with pid: {child_process.pid}")
         except TypeError:
             raise
         except OSError as err: