[JUJU-367] Improve get_charm_series to check the model for series for a local charm

examples/upgrade_local_charm_k8s.py

@@ -0,0 +1,43 @@
+"""
+This example:
+
+1. Connects to the current model
+2. Deploy a bundle and waits until it reports itself active
+3. Destroys the units and applications
+
+"""
+from juju import jasyncio
+from juju.model import Model
+
+
+async def main():
+    model = Model()
+    print('Connecting to model')
+    # Connect to current model with current user, per Juju CLI
+    await model.connect()
+
+    try:
+        print('Deploying bundle')
+        applications = await model.deploy(
+            './examples/k8s-local-bundle/bundle.yaml',
+        )
+
+        print('Waiting for active')
+        await model.wait_for_idle(status='active')
+        print("Successfully deployed!")
+
+        await applications[0].upgrade_charm(path='./examples/charms/onos.charm')
+
+        await model.wait_for_idle(status='active')
+
+        print('Removing bundle')
+        for application in applications:
+            await application.remove()
+    finally:
+        print('Disconnecting from model')
+        await model.disconnect()
+        print("Success")
+
+
+if __name__ == '__main__':
+    jasyncio.run(main())

juju/application.py

@@ -755,7 +755,7 @@ async def local_refresh(
         charm_dir = path.expanduser().resolve()
         model_config = await self.get_config()
 
-        series = get_charm_series(charm_dir)
+        series = await get_charm_series(charm_dir, self.model)
         if not series:
             model_config = await self.get_config()
             default_series = model_config.get("default-series")

juju/bundle.py

@@ -125,13 +125,8 @@ async def _handle_local_charms(self, bundle, bundle_dir):
             series = (
                 app_dict.get('series') or
                 default_series or
-                get_charm_series(charm_dir)
+                await get_charm_series(charm_dir, self.model)
             )
-            if not series:
-                model_config = await self.model.get_config()
-                default_series = model_config.get("default-series")
-                if default_series:
-                    default_series = series = default_series.value
             if not series:
                 raise JujuError(
                     "Couldn't determine series for charm at {}. "
@@ -410,11 +405,14 @@ def is_local_charm(charm_url):
     return charm_url.startswith('.') or charm_url.startswith('local:') or os.path.isabs(charm_url)
 
 
-def get_charm_series(path):
+async def get_charm_series(path, model):
     """Inspects the charm directory at ``path`` and returns a default
     series from its metadata.yaml (the first item in the 'series' list).
 
+    Tries to extract the informiation from the given model if no
+    series is determined from the path.
     Returns None if no series can be determined.
+
     """
     path = Path(path)
     try:
@@ -432,8 +430,16 @@ def get_charm_series(path):
             mark = exc.problem_mark
             log.error("Error parsing YAML file {}, line {}, column: {}".format(md, mark.line, mark.column))
         raise
-    series = data.get('series')
-    return series[0] if series else None
+    _series = data.get('series')
+    series = _series[0] if _series else None
+
+    if series is None:
+        model_config = await model.get_config()
+        default_series = model_config.get("default-series")
+        if default_series:
+            series = default_series.value
+
+    return series
 
 
 class ChangeSet: