Map firmware images that don't specify hardware-compatibility to default

This allows for a simple setup where one has only one type of hardware.

Author: tsagadar

goosebit/updates/swdesc.py

@@ -35,6 +35,10 @@ def parse_descriptor(swdesc: libconf.AttrDict[Any, Any | None]):
                 for key2 in element:
                     _append_compatibility(key, element[key2], compatibility)
 
+        if len(compatibility) == 0:
+            # if nothing is specified, assume compatibility with default / default boards
+            compatibility.append({"hw_model": "default", "hw_revision": "default"})
+
         swdesc_attrs["compatibility"] = compatibility
     except KeyError as e:
         logging.warning(f"Parsing swu descriptor failed, error={e}")

tests/updates/test_swdesc.py

@@ -5,6 +5,23 @@
 from goosebit.updates.swdesc import parse_descriptor, parse_file
 
 
+def test_parse_descriptor_no_compatibility_defined():
+    desc = AttrDict(
+        {
+            "software": {
+                "version": "1.0",
+                "description": "Software update for XXXXX Project",
+            }
+        }
+    )
+
+    swdesc_attrs = parse_descriptor(desc)
+    assert swdesc_attrs["version"] == "1.0.0"
+    assert swdesc_attrs["compatibility"] == [
+        {"hw_model": "default", "hw_revision": "default"},
+    ]
+
+
 def test_parse_descriptor_simple():
     # simplified example from https://sbabic.github.io/swupdate/sw-description.html#introduction
     desc = AttrDict(