Support specifying upload options for image builds

The upload options are expected to be provided as a JSON file. The same
options will be used for all image type and architecture combinations,
similarly as it is done for ostree options.

Extend unit tests to cover the newly added functionality.

test/unit/test_builder.py

@@ -1199,6 +1199,9 @@ class TestBuilderPlugin(PluginTest): # pylint: disable=too-many-public-methods
 
         for ir in ireqs:
             arch = ir["architecture"]
+            # Piggyback on this test case to test that no upload_options
+            # are set, if they were not provided in the args.
+            self.assertIsNone(ir.get("upload_options"))
             repos = ir["repositories"]
             assert len(repos) == 3
 
@@ -1209,6 +1212,44 @@ class TestBuilderPlugin(PluginTest): # pylint: disable=too-many-public-methods
                     ps = r.get("package_sets")
                     assert ps and ps == ["a", "b", "c", "d"]
 
+    @httpretty.activate
+    def test_compose_upload_options_global(self):
+        # Check we properly handle compose requests with global upload options
+        session = self.mock_session()
+        handler = self.make_handler(session=session)
+
+        arches = ["x86_64", "aarch64"]
+        upload_options = {
+            "region": "us-east-1",
+            "share_with_accounts": ["123456789"]
+        }
+        args = ["name", "version", "distro",
+                "image_type",
+                "fedora-candidate",
+                arches,
+                {"upload_options": upload_options}]
+
+        url = self.plugin.DEFAULT_COMPOSER_URL
+        composer = MockComposer(url, architectures=arches)
+        composer.httpretty_register()
+
+        res = handler.handler(*args)
+        assert res, "invalid compose result"
+        compose_id = res["composer"]["id"]
+        compose = composer.composes.get(compose_id)
+        self.assertIsNotNone(compose)
+
+        ireqs = compose["request"]["image_requests"]
+
+        # Check we got all the requested architectures
+        ireq_arches = [i["architecture"] for i in ireqs]
+        diff = set(arches) ^ set(ireq_arches)
+        self.assertEqual(diff, set())
+
+        for ir in ireqs:
+            uo = ir["upload_options"]
+            self.assertEqual(uo, upload_options)
+
     @httpretty.activate
     def test_compose_status_retry(self):
         compose_id = "43e57e63-ab32-4a8d-854d-3bbc117fdce3"