docker build image 失败，COPY文件出错：read-only file system

Question

docker build 时出错
Dockerfile只写了把一个运行工程目录COPY至镜像
工程目录结构层级比较多，会不会和这个有关系？

Step 5 : COPY . $DIR
Untar re-exec error: exit status 1: output: write /repository/initializer.jag: read-only file system