Create _service file from ContainerCreate

This allows to generate them properly for cases where the replacements
are not identical per build_flavor (like for kubevirt)

Author: dirkmueller

src/bci_build/containercrate.py

@@ -1,5 +1,10 @@
 """Crate to handle multibuild containers in the generator."""
 
+import xml.etree.ElementTree as ET
+from xml.dom import minidom
+
+from bci_build.service import Service
+
 
 class ContainerCrate:
     """ContainerCrate combines container build flavors into a single OBS multibuild
@@ -48,3 +53,26 @@ def multibuild(self, container) -> str:
             for pkg in self.all_build_flavors(container)
         )
         return f"<multibuild>\n{flavors}\n</multibuild>"
+
+    def service(self, container) -> str:
+        """Return the _service file string to write for this ContainerCrate."""
+        from bci_build.package import ALL_CONTAINER_IMAGE_NAMES
+
+        root = ET.Element("services")
+        root.append(
+            Service(name=f"{container.build_recipe_type}_label_helper").as_xml_element()
+        )
+        root.append(Service(name="kiwi_metainfo_helper").as_xml_element())
+        all_bcis = list(ALL_CONTAINER_IMAGE_NAMES.values())
+        all_bcis.sort(key=lambda bci: bci.uid)
+        for c in filter(
+            lambda bci: bci.crate == self and bci.os_version == container.os_version,
+            all_bcis,
+        ):
+            for r in c.replacements_via_service:
+                rtree = r.to_service(f"Dockerfile.{c.build_flavor}").as_xml_element()
+                root.append(rtree)
+
+        return minidom.parseString(ET.tostring(root, encoding="unicode")).toprettyxml(
+            indent="  "
+        )

src/bci_build/package/__init__.py

@@ -1106,9 +1106,13 @@ async def write_file_to_dest(fname: str, contents: str | bytes) -> None:
             tasks.append(write_file_to_dest(mname, self.crate.multibuild(self)))
             files.append(mname)
 
-        tasks.append(
-            write_file_to_dest("_service", SERVICE_TEMPLATE.render(image=self))
-        )
+            sname = "_service"
+            tasks.append(write_file_to_dest(sname, self.crate.service(self)))
+            files.append(sname)
+        else:
+            sname = "_service"
+            tasks.append(write_file_to_dest(sname, SERVICE_TEMPLATE.render(image=self)))
+            files.append(sname)
 
         changes_file_name = self.package_name + ".changes"
         if not (Path(dest) / changes_file_name).exists():