bump: k8s to 1.23

vendor/k8s.io/code-generator/pkg/util/build.go

@@ -18,10 +18,12 @@ package util
 
 import (
 	gobuild "go/build"
-	"path"
+	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
+
+	"golang.org/x/tools/go/packages"
 )
 
 type empty struct{}
@@ -55,9 +57,37 @@ func hasSubdir(root, dir string) (rel string, ok bool) {
 	return filepath.ToSlash(dir[len(root):]), true
 }
 
-// BoilerplatePath uses the boilerplate in code-generator by calculating the relative path to it.
+// BoilerplatePath returns the path to the boilerplate file in code-generator,
+// or "" if the default boilerplate.go.txt file cannot be located.
 func BoilerplatePath() string {
-	return path.Join(reflect.TypeOf(empty{}).PkgPath(), "/../../hack/boilerplate.go.txt")
+	// set up paths to check
+	paths := []string{
+		// works when run from root of $GOPATH containing k8s.io/code-generator
+		filepath.Join(reflect.TypeOf(empty{}).PkgPath(), "/../../hack/boilerplate.go.txt"),
+		// works when run from root of module vendoring k8s.io/code-generator
+		"vendor/k8s.io/code-generator/hack/boilerplate.go.txt",
+		// works when run from root of $GOPATH containing k8s.io/kubernetes
+		"k8s.io/kubernetes/vendor/k8s.io/code-generator/hack/boilerplate.go.txt",
+	}
+
+	// see if we can locate the module directory and add that to the list
+	config := packages.Config{Mode: packages.NeedModule}
+	if loadedPackages, err := packages.Load(&config, "k8s.io/code-generator/pkg/util"); err == nil {
+		for _, loadedPackage := range loadedPackages {
+			if loadedPackage.Module != nil && loadedPackage.Module.Dir != "" {
+				paths = append(paths, filepath.Join(loadedPackage.Module.Dir, "hack/boilerplate.go.txt"))
+			}
+		}
+	}
+
+	// try all paths and return the first that exists
+	for _, path := range paths {
+		if _, err := os.Stat(path); err == nil {
+			return path
+		}
+	}
+	// cannot be located, invoker will have to explicitly specify boilerplate file
+	return ""
 }
 
 // Vendorless trims vendor prefix from a package path to make it canonical