docker reg experimentation

main.go

package main

import (
	"io/ioutil"
	"os"

	"github.com/heroku/docker-registry-client/registry"
)

func bail(err error) {
	println(err.Error())
	os.Exit(1)
}

func main() {
	hub, err := registry.New("https://registry-1.docker.io/", "", "")
	hub.Logf = registry.Quiet
	if err != nil {
		bail(err)
	}
	tags, err := hub.Tags("weaveworks/scope")
	if err != nil {
		bail(err)
	}
	tag := tags[500]
	manifest, err := hub.ManifestV2("weaveworks/scope", tag)
	if err != nil {
		bail(err)
	}

	confDesc := manifest.Config()
	reader, err := hub.DownloadLayer("weaveworks/scope", confDesc.Digest)
	if err != nil {
		bail(err)
	}
	if reader != nil {
		defer reader.Close()
	}
	bytes, err := ioutil.ReadAll(reader)
	if err != nil {
		bail(err)
	}
	println(string(bytes))
}