Private registries

[diegombeltran]

Is it possible to pull/push images from/to private registries?

I understand it uses Moby Golang SDK and there is an ImagePullOptions parameter used to "basic-auth", but I struggled for the last few hours and all I get are unauthorized messages.

Here is a small snippet:

import images from 'k6/x/docker/images';
import encoding from 'k6/encoding';

export default function () {
  const registryAuth = encoding.b64encode(JSON.stringify({
    username: 'myUsername',
    password: 'myPassword'
  }), "url")

  const imageName = 'privateRegistry/myImage'
  const imagePullOptions = {
    RegistryAuth: registryAuth
  }

  const result = images.pull(imageName, imagePullOptions)

 console.log(`Image pulling result: ${result}`)
}

Is anything missing?

[diegombeltran]

Hello again,

Just tested with Docker SDK for Golang. It works.

package main

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"io"
	"os"

	"github.com/docker/docker/api/types"
	"github.com/docker/docker/client"
)

func main() {
	ctx := context.Background()
	cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		panic(err)
	}

	authConfig := types.AuthConfig{
		Username: "myUsername",
		Password: "myPassword",
	}
	encodedJSON, err := json.Marshal(authConfig)
	if err != nil {
		panic(err)
	}
	authStr := base64.URLEncoding.EncodeToString(encodedJSON)
	println(authStr)

	out, err := cli.ImagePull(ctx, "myRegistry/myImage", types.ImagePullOptions{RegistryAuth: authStr})
	if err != nil {
		panic(err)
	}

	defer out.Close()
	io.Copy(os.Stdout, out)
}

Base64 authStr is the same as the k6 b64encode output. Looks like imagePullOptions is not right, but I can't debug why.

Any thoughts?

[diegombeltran]

I just found this:
https://k6.io/docs/extensions/explanations/go-js-bridge/

Go field names convert from Pascal to Snake case. For example, the struct field ComparisonResult string becomes comparison_result in JS.

So the snippet looks like this:

import images from 'k6/x/docker/images';
import encoding from 'k6/encoding';

export default function () {
  const registryAuth = encoding.b64encode(JSON.stringify({
    username: 'myUsername',
    password: 'myPassword'
  }), "url")

  const imageName = 'privateRegistry/myImage'

  const imagePullOptions = {
    registry_auth: registryAuth
  }

  const result = images.pull(imageName, imagePullOptions)

 console.log(`Image pulling result: ${result}`)
}

Working. Just in case someone needs this.