https://github.com/distribution/reference

是一个处理docker image name的库，可以很方便从文件名中获取到image拉取源的url

import "github.com/distribution/reference"

named, err := reference.ParseNormalizedNamed("your-registry/your-image:tag")
if err != nil {
    // 处理错误
}

registrySource := reference.Domain(named)