How to pull image from custom docker registry with golang? - go

Question

Using docker sources how to pull image from custom registry? As a result of using such code
// Prepare auth registry for usage
func (app *App) PrepareRegistry() error {
app.AuthConfig = types.AuthConfig{
Username: Username,
Password: Password,
ServerAddress: DefaultServer,
}
resp, err := app.Client.RegistryLogin(context.Background(), app.AuthConfig)
if err != nil {
panic(err)
}
fmt.Println(resp.Status)
if resp.IdentityToken != "" {
app.AuthConfig.IdentityToken = resp.IdentityToken
}
app.AuthConfigEncoded, err = command.EncodeAuthToBase64(app.AuthConfig)
return err
}
func (app *App) ImagePull() error {
opts := types.ImagePullOptions{
All: true,
RegistryAuth: app.AuthConfigEncoded,
PrivilegeFunc: registryAuthentication(app.Name),
}
responseBody, err := app.Client.ImagePull(context.Background(), app.Name, opts)
defer responseBody.Close()
if err != nil {
return err
}
return nil
}
I am still getting the error
Login Succeeded
panic: Error response from daemon: Get https://registry-1.docker.io/v2/shalakhin/blender/tags/list: unauthorized: incorrect username or password
While ServerAddress is registry.gitlab.com, not registry-1.docker.io

Answer 1

Did you check identity token? That might cause an authentication problem.
A suggestion:
Docker client
This works fine, as I can see you did not specify the endpoint. I think you should add this info.

Answer 2

authConfig := types.AuthConfig{
Username: "username",
Password: "password",
}
encodedJSON, err := json.Marshal(authConfig)
if err != nil {
panic(err)
}
authStr := base64.URLEncoding.EncodeToString(encodedJSON)
out, err := cli.ImagePull(ctx, "alpine", types.ImagePullOptions{RegistryAuth: authStr})
if err != nil {
panic(err)
}