feat: error when building a package with zero components (#3403)

Signed-off-by: Austin Abro <[email protected]>

src/internal/packager2/layout/create_test.go

@@ -217,3 +217,10 @@ func TestCreateReproducibleTarballFromDir(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, "c09d17f612f241cdf549e5fb97c9e063a8ad18ae7a9f3af066332ed6b38556ad", shaSum)
 }
+
+func TestLoadPackageErrorWithoutCompatibleFlavor(t *testing.T) {
+	t.Parallel()
+	lint.ZarfSchema = testutil.LoadSchema(t, "../../../../zarf.schema.json")
+	_, err := LoadPackage(context.Background(), filepath.Join("testdata", "package-with-flavors"), "non-existent-flavor", map[string]string{})
+	require.EqualError(t, err, fmt.Sprintf("package validation failed: %s", lint.PkgValidateErrNoComponents))
+}

src/internal/packager2/layout/testdata/package-with-flavors/zarf.yaml

@@ -0,0 +1,11 @@
+kind: ZarfPackageConfig
+metadata:
+  name: test
+components:
+  - name: test-flavor
+    only:
+      flavor: pistachio
+
+  - name: test-flavor
+    only:
+      flavor: cashew

src/pkg/lint/validate.go

@@ -65,11 +65,15 @@ const (
 	PkgValidateErrManifestFileOrKustomize = "manifest %q must have at least one file or kustomization"
 	PkgValidateErrManifestNameLength      = "manifest %q exceed the maximum length of %d characters"
 	PkgValidateErrVariable                = "invalid package variable: %w"
+	PkgValidateErrNoComponents            = "package does not contain any compatible components"
 )
 
 // ValidatePackage runs all validation checks on the package.
 func ValidatePackage(pkg v1alpha1.ZarfPackage) error {
 	var err error
+	if len(pkg.Components) == 0 {
+		err = errors.Join(err, errors.New(PkgValidateErrNoComponents))
+	}
 	if pkg.Kind == v1alpha1.ZarfInitConfig && pkg.Metadata.YOLO {
 		err = errors.Join(err, errors.New(PkgValidateErrInitNoYOLO))
 	}

src/pkg/lint/validate_test.go

@@ -36,6 +36,16 @@ func TestZarfPackageValidate(t *testing.T) {
 			},
 			expectedErrs: nil,
 		},
+		{
+			name: "no components",
+			pkg: v1alpha1.ZarfPackage{
+				Kind: v1alpha1.ZarfPackageConfig,
+				Metadata: v1alpha1.ZarfMetadata{
+					Name: "valid-package",
+				},
+			},
+			expectedErrs: []string{PkgValidateErrNoComponents},
+		},
 		{
 			name: "invalid package",
 			pkg: v1alpha1.ZarfPackage{

src/pkg/packager/creator/creator_test.go

@@ -35,7 +35,7 @@ func TestLoadPackageDefinition(t *testing.T) {
 		{
 			name:        "invalid package definition",
 			testDir:     "invalid",
-			expectedErr: "linting error found 1 instance(s)",
+			expectedErr: "package validation failed: package does not contain any compatible components",
 			creator:     NewPackageCreator(types.ZarfCreateOptions{}, ""),
 		},
 		{
@@ -47,7 +47,7 @@ func TestLoadPackageDefinition(t *testing.T) {
 		{
 			name:        "invalid package definition",
 			testDir:     "invalid",
-			expectedErr: "linting error found 1 instance(s)",
+			expectedErr: "package validation failed: package does not contain any compatible components",
 			creator:     NewSkeletonCreator(types.ZarfCreateOptions{}, types.ZarfPublishOptions{}),
 		},
 	}