do not panic when the inventory object is missing

Signed-off-by: Gautier Delorme <gautier.delorme@gmail.com>

Author: gautierdelorme

cmd/status/cmdstatus_test.go

@@ -64,6 +64,10 @@ func TestCommand(t *testing.T) {
 		expectedErrMsg string
 		expectedOutput string
 	}{
+		"no inventory template": {
+			input:          "",
+			expectedErrMsg: "Package uninitialized. Please run \"init\" command.",
+		},
 		"no inventory in live state": {
 			input:          inventoryTemplate,
 			expectedOutput: "no resources found in the inventory\n",

pkg/inventory/inventory_test.go

@@ -256,29 +256,29 @@ func TestSplitUnstructureds(t *testing.T) {
 		expectedObjs []*unstructured.Unstructured
 		isError      bool
 	}{
-		"No objects is returns nil and no objects": {
+		"No objects returns error": {
 			allObjs:      []*unstructured.Unstructured{},
 			expectedInv:  nil,
 			expectedObjs: []*unstructured.Unstructured{},
-			isError:      false,
+			isError:      true,
 		},
 		"Only inventory object returns inv and no objects": {
 			allObjs:      []*unstructured.Unstructured{inventoryObj},
 			expectedInv:  inventoryObj,
 			expectedObjs: []*unstructured.Unstructured{},
 			isError:      false,
 		},
-		"Single object returns nil inventory and object": {
-			allObjs:      []*unstructured.Unstructured{pod1},
-			expectedInv:  nil,
+		"Inventory object with single object returns inventory and object": {
+			allObjs:      []*unstructured.Unstructured{inventoryObj, pod1},
+			expectedInv:  inventoryObj,
 			expectedObjs: []*unstructured.Unstructured{pod1},
 			isError:      false,
 		},
-		"Multiple non-inventory objects returns nil inventory and objs": {
+		"Multiple non-inventory objects returns error": {
 			allObjs:      []*unstructured.Unstructured{pod1, pod2, pod3},
 			expectedInv:  nil,
 			expectedObjs: []*unstructured.Unstructured{pod1, pod2, pod3},
-			isError:      false,
+			isError:      true,
 		},
 		"Inventory object with multiple others splits correctly": {
 			allObjs:      []*unstructured.Unstructured{pod1, pod2, inventoryObj, pod3},

pkg/inventory/storage.go

@@ -110,9 +110,8 @@ func ValidateNoInventory(objs object.UnstructuredSet) error {
 
 // splitUnstructureds takes a set of unstructured.Unstructured objects and
 // splits it into one set that contains the inventory object templates and
-// another one that contains the remaining resources. If there is no inventory
-// object the first return value is nil. Returns an error if there are
-// more than one inventory objects.
+// another one that contains the remaining resources. Returns an error if there
+// there is no inventory object or more than one inventory objects.
 func SplitUnstructureds(objs object.UnstructuredSet) (*unstructured.Unstructured, object.UnstructuredSet, error) {
 	invs := make(object.UnstructuredSet, 0)
 	resources := make(object.UnstructuredSet, 0)
@@ -125,12 +124,13 @@ func SplitUnstructureds(objs object.UnstructuredSet) (*unstructured.Unstructured
 	}
 	var inv *unstructured.Unstructured
 	var err error
-	if len(invs) == 1 {
+	switch len(invs) {
+	case 0:
+		err = &NoInventoryObjError{}
+	case 1:
 		inv = invs[0]
-	} else if len(invs) > 1 {
-		err = &MultipleInventoryObjError{
-			InventoryObjectTemplates: invs,
-		}
+	default:
+		err = &MultipleInventoryObjError{InventoryObjectTemplates: invs}
 	}
 	return inv, resources, err
 }