cfengine build: Stopped prompting to deploy if not possible

src/cfengine_cli/cfengine_wrapper/cfengine_commands.py

@@ -31,6 +31,7 @@
 )
 from cfengine_cli.cfengine_wrapper.cfengine_utils import (
     extract_agent_file,
+    has_known_hubs,
     prompt_two_options,
     prompt_yes_no,
     require_executable,
@@ -249,6 +250,10 @@ def build(hub=None, non_interactive=False) -> int:
     rc = build_command()
     if rc != 0:
         return rc
+    if not hub and not has_known_hubs():
+        # Nothing to deploy to, so don't ask. Mirrors the check cf-remote's
+        # deploy does (it errors with "No hub to deploy to" in this case).
+        return 0
     if prompt_yes_no(
         "Deploy the built policy set now?",
         default=True,

src/cfengine_cli/cfengine_wrapper/cfengine_utils.py

@@ -90,6 +90,11 @@ def _known_hosts(role_filter=None) -> Iterator[tuple[str, list[str]]]:
             yield host_id, aliases
 
 
+def has_known_hubs() -> bool:
+    """True if cf-remote knows about any saved/spawned hub (without connecting)."""
+    return any(True for _ in _known_hosts("hub"))
+
+
 @lru_cache(maxsize=None)
 def _host_info(host: str):
     try: