Move k8sMaintainer code to its own dir

Signed-off-by: Brett Tofel <[email protected]>

Author: bentito

Makefile

@@ -122,7 +122,7 @@ lint-custom: custom-linter-build #EXHELP Call custom linter for the project
 
 .PHONY: k8s-maintainer #EXHELP this tool also calls `go mod tidy` but also allows us maintain k8s.io/kubernetes` changes bumping related staging modules (e.g., `k8s.io/api`, `k8s.io/apimachinery) as needed
 k8s-maintainer:
-	go run hack/tools/k8sMaintainer.go
+	go run hack/tools/k8smaintainer/main.go
 
 .PHONY: tidy
 tidy: k8s-maintainer #HELP Update dependencies.

hack/tools/k8sMaintainer_doc.md hack/tools/k8smaintainer/README.md

@@ -28,12 +28,37 @@ func main() {
 	flag.BoolVar(&debug, "debug", false, "Enable debug output")
 	flag.Parse()
 
-	if err := fixGoMod("go.mod"); err != nil {
+	mainGoMod := getMainGoModPath()
+
+	if err := fixGoMod(mainGoMod); err != nil {
 		fmt.Fprintf(os.Stderr, "fixGoMod failed: %v\n", err)
 		os.Exit(1)
 	}
 }
 
+func getMainGoModPath() string {
+	rootDir := findProjectRoot()
+	return fmt.Sprintf("%s/go.mod", rootDir)
+}
+
+func findProjectRoot() string {
+	cwd, err := os.Getwd()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to get working directory: %v\n", err)
+		os.Exit(1)
+	}
+
+	for cwd != "/" {
+		if _, err := os.Stat(fmt.Sprintf("%s/go.mod", cwd)); err == nil {
+			return cwd
+		}
+		cwd = cwd[:strings.LastIndex(cwd, "/")]
+	}
+	fmt.Fprintln(os.Stderr, "Error: Could not find project root with go.mod")
+	os.Exit(1)
+	return ""
+}
+
 // fixGoMod is the main entrypoint. It does a 2‐phase approach:
 //
 //	Remove old k8s.io/* replace lines, rewrite + tidy so they’re really gone.