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step_download_guest_additions.go
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step_download_guest_additions.go
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package common
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"strings"
"github.com/hashicorp/packer/common"
"github.com/hashicorp/packer/helper/multistep"
"github.com/hashicorp/packer/packer"
"github.com/hashicorp/packer/template/interpolate"
)
var additionsVersionMap = map[string]string{
"4.2.1": "4.2.0",
"4.1.23": "4.1.22",
}
type guestAdditionsUrlTemplate struct {
Version string
}
// This step uploads a file containing the VirtualBox version, which
// can be useful for various provisioning reasons.
//
// Produces:
// guest_additions_path string - Path to the guest additions.
type StepDownloadGuestAdditions struct {
GuestAdditionsMode string
GuestAdditionsURL string
GuestAdditionsSHA256 string
Ctx interpolate.Context
}
func (s *StepDownloadGuestAdditions) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
var action multistep.StepAction
driver := state.Get("driver").(Driver)
ui := state.Get("ui").(packer.Ui)
// If we've disabled guest additions, don't download
if s.GuestAdditionsMode == GuestAdditionsModeDisable {
log.Println("Not downloading guest additions since it is disabled.")
return multistep.ActionContinue
}
// Get VBox version
version, err := driver.Version()
if err != nil {
state.Put("error", fmt.Errorf("Error reading version for guest additions download: %s", err))
return multistep.ActionHalt
}
if newVersion, ok := additionsVersionMap[version]; ok {
log.Printf("Rewriting guest additions version: %s to %s", version, newVersion)
version = newVersion
}
additionsName := fmt.Sprintf("VBoxGuestAdditions_%s.iso", version)
// Use provided version or get it from virtualbox.org
var checksum string
checksumType := "sha256"
// Grab the guest_additions_url as specified by the user.
url := s.GuestAdditionsURL
// Initialize the template context so we can interpolate some variables..
s.Ctx.Data = &guestAdditionsUrlTemplate{
Version: version,
}
// Interpolate any user-variables specified within the guest_additions_url
url, err = interpolate.Render(s.GuestAdditionsURL, &s.Ctx)
if err != nil {
err := fmt.Errorf("Error preparing guest additions url: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// If this resulted in an empty url, then ask the driver about it.
if url == "" {
log.Printf("guest_additions_url is blank; querying driver for iso.")
url, err = driver.Iso()
if err == nil {
checksumType = "none"
} else {
ui.Error(err.Error())
url = fmt.Sprintf(
"https://download.virtualbox.org/virtualbox/%s/%s",
version,
additionsName)
}
}
// The driver couldn't even figure it out, so fail hard.
if url == "" {
err := fmt.Errorf("Couldn't detect guest additions URL.\n" +
"Please specify `guest_additions_url` manually.")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// Figure out a default checksum here
if checksumType != "none" {
if s.GuestAdditionsSHA256 != "" {
checksum = s.GuestAdditionsSHA256
} else {
checksum, action = s.downloadAdditionsSHA256(ctx, state, version, additionsName)
if action != multistep.ActionContinue {
return action
}
}
}
// Convert the file/url to an actual URL for step_download to process.
url, err = common.ValidatedURL(url)
if err != nil {
err := fmt.Errorf("Error preparing guest additions url: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
log.Printf("Guest additions URL: %s", url)
// We're good, so let's go ahead and download this thing..
downStep := &common.StepDownload{
Checksum: checksum,
ChecksumType: checksumType,
Description: "Guest additions",
ResultKey: "guest_additions_path",
Url: []string{url},
}
return downStep.Run(ctx, state)
}
func (s *StepDownloadGuestAdditions) Cleanup(state multistep.StateBag) {}
func (s *StepDownloadGuestAdditions) downloadAdditionsSHA256(ctx context.Context, state multistep.StateBag, additionsVersion string, additionsName string) (string, multistep.StepAction) {
// First things first, we get the list of checksums for the files available
// for this version.
checksumsUrl := fmt.Sprintf(
"https://download.virtualbox.org/virtualbox/%s/SHA256SUMS",
additionsVersion)
checksumsFile, err := ioutil.TempFile("", "packer")
if err != nil {
state.Put("error", fmt.Errorf(
"Failed creating temporary file to store guest addition checksums: %s",
err))
return "", multistep.ActionHalt
}
defer os.Remove(checksumsFile.Name())
checksumsFile.Close()
downStep := &common.StepDownload{
Description: "Guest additions checksums",
ResultKey: "guest_additions_checksums_path",
TargetPath: checksumsFile.Name(),
Url: []string{checksumsUrl},
}
action := downStep.Run(ctx, state)
if action == multistep.ActionHalt {
return "", action
}
// Next, we find the checksum for the file we're looking to download.
// It is an error if the checksum cannot be found.
checksumsF, err := os.Open(state.Get("guest_additions_checksums_path").(string))
if err != nil {
state.Put("error", fmt.Errorf("Error opening guest addition checksums: %s", err))
return "", multistep.ActionHalt
}
defer checksumsF.Close()
// We copy the contents of the file into memory. In general this file
// is quite small so that is okay. In the future, we probably want to
// use bufio and iterate line by line.
var contents bytes.Buffer
io.Copy(&contents, checksumsF)
checksum := ""
for _, line := range strings.Split(contents.String(), "\n") {
parts := strings.Fields(line)
log.Printf("Checksum file parts: %#v", parts)
if len(parts) != 2 {
// Bogus line
continue
}
if strings.HasSuffix(parts[1], additionsName) {
checksum = parts[0]
log.Printf("Guest additions checksum: %s", checksum)
break
}
}
if checksum == "" {
state.Put("error", fmt.Errorf(
"The checksum for the file '%s' could not be found.", additionsName))
return "", multistep.ActionHalt
}
return checksum, multistep.ActionContinue
}