cerbero: Fix python 3.6 compat (regression)

The heartbeat is purely cosmetic anyway.

Fixes https://gitlab.freedesktop.org/gstreamer/cerbero/-/issues/400

Part-of: <https://gitlab.freedesktop.org/gstreamer/cerbero/-/merge_requests/1069>

1 files changed, 8 insertions, 6 deletions

diff --git a/cerbero/build/oven.py b/cerbero/build/oven.py
index 5f3155a4..75f9b72a 100644
--- a/cerbero/build/oven.py
+++ b/cerbero/build/oven.py
@@ -398,18 +398,20 @@ class Oven (object):
             tasks.append(asyncio.ensure_future(cook_recipe_worker(default_queue, set(all_steps) - set(used_steps))))
 
         async def recipes_done():
-            async def heartbeat_output():
-                while True:
-                    await asyncio.sleep(60)
-                    self._build_status_printer.heartbeat()
+            if hasattr(asyncio, 'create_task'):
+                async def heartbeat_output():
+                    while True:
+                        await asyncio.sleep(60)
+                        self._build_status_printer.heartbeat()
 
-            heartbeat_task = asyncio.create_task(heartbeat_output())
+                heartbeat_task = asyncio.create_task(heartbeat_output())
 
             while built_recipes & recipe_targets != recipe_targets:
                 for q in queues.values():
                     await q.join()
 
-            heartbeat_task.cancel()
+            if hasattr(asyncio, 'create_task'):
+                heartbeat_task.cancel()
 
 
         # push the initial set of recipes that have no dependencies to start