make ucloud builder's base url configurable

builder/ucloud/uhost/access_config.go

@@ -18,6 +18,7 @@ type AccessConfig struct {
 	PrivateKey string `mapstructure:"private_key"`
 	Region     string `mapstructure:"region"`
 	ProjectId  string `mapstructure:"project_id"`
+	BaseUrl    string `mapstructure:"base_url"`
 
 	client *UCloudClient
 }
@@ -30,6 +31,9 @@ func (c *AccessConfig) Client() (*UCloudClient, error) {
 	cfg := ucloud.NewConfig()
 	cfg.Region = c.Region
 	cfg.ProjectId = c.ProjectId
+	if c.BaseUrl != "" {
+		cfg.BaseUrl = c.BaseUrl
+	}
 	cfg.UserAgent = fmt.Sprintf("Packer-UCloud/%s", version.FormattedVersion())
 
 	cred := auth.NewCredential()

builder/ucloud/uhost/builder_acc_test.go

@@ -3,6 +3,7 @@ package uhost
 import (
 	"fmt"
 	"github.com/hashicorp/packer/packer"
+	"github.com/stretchr/testify/assert"
 	"os"
 	"testing"
 
@@ -193,6 +194,17 @@ func testAccPreCheck(t *testing.T) {
 	}
 }
 
+func TestUCloudClientBaseUrlConfigurable(t *testing.T) {
+	const url = "baseUrl"
+	access := &AccessConfig{BaseUrl: url}
+	client, err := access.Client()
+	assert.Nil(t, err)
+	assert.Equal(t, url, client.uaccountconn.Client.GetConfig().BaseUrl, "account conn's base url not configurable")
+	assert.Equal(t, url, client.uhostconn.Client.GetConfig().BaseUrl, "host conn's base url not configurable")
+	assert.Equal(t, url, client.unetconn.Client.GetConfig().BaseUrl, "net conn's base url not configurable")
+	assert.Equal(t, url, client.vpcconn.Client.GetConfig().BaseUrl, "vpc conn's base url not configurable")
+}
+
 func testUCloudClient() (*UCloudClient, error) {
 	access := &AccessConfig{Region: "cn-bj2"}
 	err := access.Config()