skaffold init and buildpacks: skip dependencies

pkg/skaffold/build/buildpacks/init.go

@@ -18,7 +18,9 @@ package buildpacks
 
 import (
 	"fmt"
+	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/schema/latest"
 )
@@ -69,7 +71,22 @@ func (c ArtifactConfig) Path() string {
 
 // validate checks if a file is a valid Buildpack configuration.
 func validate(path string) bool {
-	name := filepath.Base(path)
+	switch filepath.Base(path) {
+	case "package.json":
+		return !hasParent(path, "node_modules")
+	case "go.mod":
+		return !hasParent(path, "vendor")
+	default:
+		return false
+	}
+}
+
+func hasParent(path, parent string) bool {
+	for _, p := range strings.Split(path, string(os.PathSeparator)) {
+		if p == parent {
+			return true
+		}
+	}
 
-	return name == "package.json" || name == "go.mod"
+	return false
 }

pkg/skaffold/build/buildpacks/init_test.go

@@ -32,17 +32,27 @@ func TestValidate(t *testing.T) {
 	}{
 		{
 			description:   "NodeJS",
-			path:          "path/to/package.json",
+			path:          filepath.Join("path", "to", "package.json"),
 			expectedValid: true,
 		},
+		{
+			description:   "NodeJS (ignored)",
+			path:          filepath.Join("node_modules", "package.json"),
+			expectedValid: false,
+		},
 		{
 			description:   "Go",
-			path:          "path/to/go.mod",
+			path:          filepath.Join("path", "to", "go.mod"),
 			expectedValid: true,
 		},
+		{
+			description:   "Go (ignored)",
+			path:          filepath.Join("vendor", "go.mod"),
+			expectedValid: false,
+		},
 		{
 			description:   "Unknown language",
-			path:          "path/to/something.txt",
+			path:          filepath.Join("path", "to", "something.txt"),
 			expectedValid: false,
 		},
 	}