mv src/common src/utils src/grpc-etcdv3 to pkg

pkg/utils/file.go

@@ -0,0 +1,22 @@
+package utils
+
+import "os"
+
+// Determine whether the given path is a folder
+func IsDir(path string) bool {
+	s, err := os.Stat(path)
+	if err != nil {
+		return false
+	}
+	return s.IsDir()
+}
+
+// Determine whether the given path is a file
+func IsFile(path string) bool {
+	return !IsDir(path)
+}
+
+// Create a directory
+func MkDir(path string) error {
+	return os.MkdirAll(path, os.ModePerm)
+}