Add validation for default prim when contributing to asset instead of shot

server_addon/houdini/client/ayon_houdini/plugins/publish/validate_usd_asset_contribution_default_prim.py

@@ -0,0 +1,76 @@
+import hou
+import pyblish.api
+
+from ayon_core.pipeline import PublishValidationError
+from ayon_core.pipeline.publish import RepairAction, OptionalPyblishPluginMixin
+
+from ayon_houdini.api.action import SelectROPAction
+from ayon_houdini.api import plugin
+
+
+class ValidateUSDAssetContributionDefaultPrim(plugin.HoudiniInstancePlugin,
+                                              OptionalPyblishPluginMixin):
+    """Validate the default prim is set when USD contribution is set to asset.
+
+    If the USD asset contributions is enabled and the user has it set to
+    initialize asset as "asset" then most likely they are looking to publish
+    into an asset structure - which should have a default prim that matches
+    the folder's name. To ensure that's the case we force require the
+    value to be set on the ROP node.
+
+    Note that another validator "Validate USD Rop Default Prim" enforces the
+    primitive actually exists (or has modifications) if the ROP specifies
+    a default prim - so that does not have to be validated with this validator.
+
+     """
+
+    order = pyblish.api.ValidatorOrder
+    families = ["usdrop"]
+    hosts = ["houdini"]
+    label = "Validate USD Asset Contribution Default Prim"
+    actions = [SelectROPAction, RepairAction]
+    optional = True
+
+    def process(self, instance):
+
+        # Check if instance is set to be an asset contribution
+        settings = self.get_attr_values_from_data_for_plugin_name(
+            "CollectUSDLayerContributions", instance.data
+        )
+        self.log.info(settings)
+        if (
+                not settings.get("contribution_enabled", False)
+                or settings.get("contribution_target_product_init") != "asset"
+        ):
+            return
+
+        rop_node = hou.node(instance.data["instance_node"])
+        default_prim = rop_node.evalParm("defaultprim")
+        if not default_prim:
+            raise PublishValidationError(
+                f"No default prim specified on ROP node: {rop_node.path()}"
+            )
+
+        folder_name = instance.data["folderPath"].rsplit("/", 1)[-1]
+        if not default_prim.lstrip("/") == folder_name:
+            raise PublishValidationError(
+                f"Default prim specified on ROP node does not match the "
+                f"asset's folder name: '{default_prim}' "
+                f"(should be: '/{folder_name}')"
+            )
+
+    @classmethod
+    def repair(cls, instance):
+        rop_node = hou.node(instance.data["instance_node"])
+        rop_node.parm("defaultprim").set(
+            "/`strsplit(chs(\"folderPath\"), \"/\", -1)`"
+        )
+
+    @staticmethod
+    def get_attr_values_from_data_for_plugin_name(
+            plugin_name: str, data: dict) -> dict:
+        return (
+            data
+            .get("publish_attributes", {})
+            .get(plugin_name, {})
+        )