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// Copyright 2021 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
type FromGCECmd struct {
DestinationPath string
ImageProject string
SourceImage string
GcsBucket string
Zone string
// Name returns the name of the command.
func (fgc *FromGCECmd) Name() string {
return "from-gce"
// Synopsis returns short description of the command.
func (fgc *FromGCECmd) Synopsis() string {
return "Converts the Input GCE image " +
"to OVA format and uploads to destination path"
// Usage returns instructions on how to use the command.
func (fgc *FromGCECmd) Usage() string {
return "Converts the Input GCE image " +
"to OVA format and uploads to destination path"
// SetFlags adds the flags to the specified set.
func (fgc *FromGCECmd) SetFlags(fs *flag.FlagSet) {
fs.StringVar(&fgc.GcsBucket, "gcs-bucket", "",
"GCS bucket for the working dir. It is mandatory. Example: sample-bucket")
fs.StringVar(&fgc.Zone, "zone", "us-west1-b",
"Zone is required when exporting a GCE image. It is optional, by default it is us-west1-b. Example: us-west1-b")
fs.StringVar(&fgc.DestinationPath, "destination-path", "",
"URL to the save the OVA Image. It is mandatory. Example: gs://output-bucket/output.ova")
fs.StringVar(&fgc.ImageProject, "image-project", "",
"Project in which the source image is present. It is mandatory. Example: input-project")
fs.StringVar(&fgc.SourceImage, "source-image", "",
"Name of the Source Image. It is mandatory. Example: input-gce")
// Execute executes the command (converts GCE to OVA) and returns the CommandStatus
func (fgc *FromGCECmd) Execute(ctx context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
if err := fgc.validateInput(); err != nil {
glog.Errorf("failed to parse flags: %v", err)
return subcommands.ExitFailure
exitStatus := subcommands.ExitSuccess
gceToOVAConverterConfig := args[0].(*ovaconverter.GCEToOVAConverterConfig)
converter := ovaconverter.NewConverter(ctx)
if err := converter.ConvertOVAFromGCE(ctx, fgc.SourceImage, fgc.DestinationPath,
fgc.GcsBucket, fgc.ImageProject, fgc.Zone, gceToOVAConverterConfig); err != nil {
glog.Errorf("failed to create the OVA image: %v", err)
exitStatus = subcommands.ExitFailure
return exitStatus
// validateInput validates the input from flags parsed and returns error when the
// mandatory input values are not present
func (tgc *FromGCECmd) validateInput() error {
var errMsgs []string
if tgc.GcsBucket == "" {
errMsgs = append(errMsgs, "gcs-bucket is mandatory")
if tgc.DestinationPath == "" {
errMsgs = append(errMsgs, "destination-path is mandatory")
if tgc.SourceImage == "" {
errMsgs = append(errMsgs, "source-image is mandatory")
if tgc.ImageProject == "" {
errMsgs = append(errMsgs, "image-project is mandatory")
if len(errMsgs) > 0 {
return errors.New(strings.Join(errMsgs, ";"))
return nil