more debug logging in exec

b2/_internal/_cli/autocomplete_install.py

@@ -178,6 +178,9 @@ def is_enabled(self) -> bool:
                 "pexpect is recommended for Zsh shell autocomplete installation check without tty. "
                 "You can install it via `pip install pexpect`."
             )
+        _silent_success_run(
+            [self.shell_exec, '-c', 'autoload -Uz compinit; compinit; echo AUDIT; compaudit']
+        )
 
         cmd = [self.shell_exec, '-i', '-c', f'[[ -v _comps[{quote(self.prog)}] ]]']
         return _silent_success_run(cmd) if emulate_tty else _silent_success_run_with_pty(cmd)
@@ -258,9 +261,8 @@ def _silent_success_run_with_pty(cmd: list[str], timeout: int = 5, env: dict | N
     finally:
         child.close()
 
-    logger.debug(
-        "Command %r exited with code %r, output: %r", cmd, child.exitstatus, output.getvalue()
-    )
+    (logger.debug if child.exitstatus == 0 else logger.warning
+    )("Command %r exited with code %r, output: %r", cmd, child.exitstatus, output.getvalue())
     return child.exitstatus == 0