stages: add "devices/mounts" as allowed inputs for users/selinux

When moving to `bootc install to-filesystem` we will need support
for mounting the deployed disk and writing to the deployment root
this requires that we teach the users and selinux stages to
have them available. This is a first step towards this.

It also adds tests to ensure the options can be passed.

stages/org.osbuild.selinux.meta.json

@@ -48,6 +48,13 @@
           "default": false
         }
       }
+    },
+    "devices": {
+      "type": "object",
+      "additionalProperties": true
+    },
+    "mounts": {
+      "type": "array"
     }
   }
 }

stages/org.osbuild.users.meta.json

@@ -72,6 +72,13 @@
           }
         }
       }
+    },
+    "devices": {
+      "type": "object",
+      "additionalProperties": true
+    },
+    "mounts": {
+      "type": "array"
     }
   }
 }

stages/test/conftest.py

@@ -43,3 +43,39 @@ def stage_schema(request: pytest.FixtureRequest) -> osbuild.meta.Schema:
     root = caller_dir.parent.parent
     mod_info = osbuild.meta.ModuleInfo.load(root, "Stage", stage_name)
     return osbuild.meta.Schema(mod_info.get_schema(version=schema_version), stage_name)
+
+
+@pytest.fixture
+def bootc_devices_mounts_dict() -> dict:
+    """ bootc_devices_mounts_dict returns a dict with a typical bootc
+    devices/mount dict
+    """
+    return {
+        "devices": {
+            "disk": {
+                "type": "org.osbuild.loopback",
+                "options": {
+                    "filename": "disk.raw",
+                    "partscan": True,
+                }
+            }
+        },
+        "mounts": [
+            {
+                "name": "root",
+                "type": "org.osbuild.ext4",
+                "source": "disk",
+                "partition": 4,
+                "target": "/"
+            }, {
+                "name": "ostree.deployment",
+                "type": "org.osbuild.ostree.deployment",
+                "options": {
+                    "source": "mount",
+                    "deployment": {
+                        "default": True,
+                    }
+                }
+            }
+        ]
+    }

stages/test/test_selinux.py

@@ -48,6 +48,13 @@ def test_schema_validation_selinux_file_context_required(stage_schema):
     testutil.assert_jsonschema_error_contains(res, expected_err, expected_num_errs=1)
 
 
+def test_schema_supports_bootc_style_mounts(stage_schema, bootc_devices_mounts_dict):
+    test_input = bootc_devices_mounts_dict
+    test_input["type"] = STAGE_NAME
+    res = stage_schema.validate(test_input)
+    assert res.valid is True, f"err: {[e.as_dict() for e in res.errors]}"
+
+
 @patch("osbuild.util.selinux.setfiles")
 def test_selinux_file_contexts(mocked_setfiles, tmp_path, stage_module):
     options = {

stages/test/test_users.py

@@ -36,6 +36,13 @@ def test_schema_validation(stage_schema, test_data, expected_err):
         assert_jsonschema_error_contains(res, expected_err, expected_num_errs=1)
 
 
+def test_schema_supports_bootc_style_mounts(stage_schema, bootc_devices_mounts_dict):
+    test_input = bootc_devices_mounts_dict
+    test_input["type"] = STAGE_NAME
+    res = stage_schema.validate(test_input)
+    assert res.valid is True, f"err: {[e.as_dict() for e in res.errors]}"
+
+
 TEST_CASES = [
     # user_opts,expected commandline args
     ({}, []),