Also add internal fsutil

internal/fsutil/filepath.go

@@ -0,0 +1,33 @@
+package fsutil
+
+import (
+	"os"
+	"path/filepath"
+)
+
+// FindAncestorPath searches for a file or directory with the given name (s)
+// in the current directory and all parent directories.
+// It returns the full path if found, or an empty string if not found.
+func FindAncestorPath(s string) string {
+	currentDir, err := os.Getwd()
+	if err != nil {
+		return ""
+	}
+
+	for {
+		fullPath := filepath.Join(currentDir, s)
+		if _, err := os.Stat(fullPath); err == nil {
+			return fullPath
+		}
+
+		// Move to the parent directory
+		parentDir := filepath.Dir(currentDir)
+		if parentDir == currentDir {
+			// We've reached the root directory
+			break
+		}
+		currentDir = parentDir
+	}
+
+	return ""
+}