gistfile1.txt

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"os"

	"github.com/fsouza/go-dockerclient"
)

func pullImage(registry, repository, name, tag string) {
	fmt.Printf("pulling %s/%s/%s:%s... ", registry, repository, name, tag)

	client, err := docker.NewClientFromEnv()

	if err != nil {
		fmt.Printf("%#v\n", err)
		return
	}

	err = client.PullImage(
		docker.PullImageOptions{repository + "/" + name, registry, tag, nil, false},
		docker.AuthConfiguration{})

	if err != nil {
		fmt.Printf("%#v\n", err)
		return
	}

	fmt.Println("done.")
}

func dumpImage(id string) {
	var buf bytes.Buffer

	client, err := docker.NewClientFromEnv()

	if err != nil {
		fmt.Printf("%#v\n", err)
		return
	}

	err = client.ExportImages(docker.ExportImagesOptions{Names: []string{id}, OutputStream: &buf})
	if nil != err {
		fmt.Printf("%#v\n", err)
		return
	}

	err = ioutil.WriteFile("image.dat", buf.Bytes(), 0644)
	if err != nil {
		fmt.Printf("%#v\n", err)
		return
	}
}

func main() {
	pullImage("registry.docker.com", "projectatomic", "mariadb-centos7-atomicapp", "latest")

	client, err := docker.NewClientFromEnv()

	if err != nil {
		fmt.Printf("%#v\n", err)
		return
	}

	mariadbHistory, _ := client.ImageHistory("projectatomic/mariadb-centos7-atomicapp")
	fmt.Printf("%#v\n", mariadbHistory[0].ID)

	err = client.DownloadFromContainer(mariadbHistory[0].ID, docker.DownloadFromContainerOptions{os.Stdout, "/Nulecule"})
	if err != nil {
		fmt.Printf("%#v\n", err)
		return
	}
}