feat(lint): Ports v2 functionality for linting pre-release charts

This is a port of #5177

Signed-off-by: Taylor Thomas <taylor.thomas@microsoft.com>

pkg/action/lint.go

@@ -94,12 +94,15 @@ func lintChart(path string, vals map[string]interface{}, namespace string, stric
 			return linter, errors.Wrap(err, "unable to extract tarball")
 		}
 
-		lastHyphenIndex := strings.LastIndex(filepath.Base(path), "-")
-		if lastHyphenIndex <= 0 {
-			return linter, errors.Errorf("unable to parse chart archive %q, missing '-'", filepath.Base(path))
+		files, err := ioutil.ReadDir(tempDir)
+		if err != nil {
+			return linter, errors.Wrapf(err, "unable to read temporary output directory %s", tempDir)
+		}
+		if !files[0].IsDir() {
+			return linter, errors.Errorf("unexpected file %s in temporary output directory %s", files[0].Name(), tempDir)
 		}
-		base := filepath.Base(path)[:lastHyphenIndex]
-		chartPath = filepath.Join(tempDir, base)
+
+		chartPath = filepath.Join(tempDir, files[0].Name())
 	} else {
 		chartPath = path
 	}

pkg/action/lint_test.go

@@ -24,13 +24,6 @@ var (
 	values                  = make(map[string]interface{})
 	namespace               = "testNamespace"
 	strict                  = false
-	archivedChartPath            = "../../cmd/helm/testdata/testcharts/compressedchart-0.1.0.tgz"
-	archivedChartPathWithHyphens = "../../cmd/helm/testdata/testcharts/compressedchart-with-hyphens-0.1.0.tgz"
-	invalidArchivedChartPath     = "../../cmd/helm/testdata/testcharts/invalidcompressedchart0.1.0.tgz"
-	chartDirPath                 = "../../cmd/helm/testdata/testcharts/decompressedchart/"
-	chartMissingManifest         = "../../cmd/helm/testdata/testcharts/chart-missing-manifest"
-	chartSchema                  = "../../cmd/helm/testdata/testcharts/chart-with-schema"
-	chartSchemaNegative          = "../../cmd/helm/testdata/testcharts/chart-with-schema-negative"
 	chart1MultipleChartLint = "../../cmd/helm/testdata/testcharts/multiplecharts-lint-chart-1"
 	chart2MultipleChartLint = "../../cmd/helm/testdata/testcharts/multiplecharts-lint-chart-2"
 	corruptedTgzChart       = "../../cmd/helm/testdata/testcharts/corrupted-compressed-chart.tgz"
@@ -38,26 +31,57 @@ var (
 )
 
 func TestLintChart(t *testing.T) {
-	if _, err := lintChart(chartDirPath, values, namespace, strict); err != nil {
-		t.Error(err)
+	tests := []struct {
+		name      string
+		chartPath string
+		err       bool
+	}{
+		{
+			name:      "decompressed-chart",
+			chartPath: "../../cmd/helm/testdata/testcharts/decompressedchart/",
+		},
+		{
+			name:      "archived-chart-path",
+			chartPath: "../../cmd/helm/testdata/testcharts/compressedchart-0.1.0.tgz",
+		},
+		{
+			name:      "archived-chart-path-with-hyphens",
+			chartPath: "../../cmd/helm/testdata/testcharts/compressedchart-with-hyphens-0.1.0.tgz",
+		},
+		{
+			name:      "invalid-archived-chart-path",
+			chartPath: "../../cmd/helm/testdata/testcharts/invalidcompressedchart0.1.0.tgz",
+			err:       true,
+		},
+		{
+			name:      "chart-missing-manifest",
+			chartPath: "../../cmd/helm/testdata/testcharts/chart-missing-manifest",
+			err:       true,
+		},
+		{
+			name:      "chart-with-schema",
+			chartPath: "../../cmd/helm/testdata/testcharts/chart-with-schema",
+		},
+		{
+			name:      "chart-with-schema-negative",
+			chartPath: "../../cmd/helm/testdata/testcharts/chart-with-schema-negative",
+		},
+		{
+			name:      "pre-release-chart",
+			chartPath: "../../cmd/helm/testdata/testcharts/pre-release-chart-0.1.0-alpha.tgz",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := lintChart(tt.chartPath, map[string]interface{}{}, namespace, strict)
+			switch {
+			case err != nil && !tt.err:
+				t.Errorf("%s", err)
+			case err == nil && tt.err:
+				t.Errorf("Expected a chart parsing error")
 			}
-	if _, err := lintChart(archivedChartPath, values, namespace, strict); err != nil {
-		t.Error(err)
-	}
-	if _, err := lintChart(archivedChartPathWithHyphens, values, namespace, strict); err != nil {
-		t.Error(err)
-	}
-	if _, err := lintChart(invalidArchivedChartPath, values, namespace, strict); err == nil {
-		t.Error("Expected a chart parsing error")
-	}
-	if _, err := lintChart(chartMissingManifest, values, namespace, strict); err == nil {
-		t.Error("Expected a chart parsing error")
-	}
-	if _, err := lintChart(chartSchema, values, namespace, strict); err != nil {
-		t.Error(err)
-	}
-	if _, err := lintChart(chartSchemaNegative, values, namespace, strict); err != nil {
-		t.Error(err)
+		})
 	}
 }
 

pkg/chartutil/expand_test.go

@@ -39,6 +39,19 @@ func TestExpand(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	files, err := ioutil.ReadDir(dest)
+	if err != nil {
+		t.Fatalf("error reading output directory %s: %s", dest, err)
+	}
+
+	if len(files) != 1 {
+		t.Fatalf("expected a single chart directory in output directory %s", dest)
+	}
+
+	if !files[0].IsDir() {
+		t.Fatalf("expected a chart directory in output directory %s", dest)
+	}
+
 	expectedChartPath := filepath.Join(dest, "frobnitz")
 	fi, err := os.Stat(expectedChartPath)
 	if err != nil {