what is going on

utils/file.go

@@ -0,0 +1,34 @@
+package utils
+
+import (
+	"io"
+	"log"
+	"os"
+)
+
+func CopyFile(src, dst string) (string, error) {
+	_, err := os.Stat(dst)
+	if err == nil {
+		return dst, nil
+	}
+
+	log.Printf("copying image: %s %s", src, dst)
+	srcFile, err := os.Open(src)
+	if err != nil {
+		return dst, err
+	}
+	defer srcFile.Close()
+
+	dstFile, err := os.Create(dst)
+	if err != nil {
+		return dst, err
+	}
+	defer dstFile.Close()
+
+	_, err = io.Copy(dstFile, srcFile)
+	if err != nil {
+		return dst, err
+	}
+
+	return dst, dstFile.Sync()
+}