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// +build amd64,linux arm64,linux amd64,darwin arm64,darwin
package machine
import (
"fmt"
"io"
"io/ioutil"
"net/http"
url2 "net/url"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/containers/image/v5/pkg/compression"
"github.com/docker/docker/pkg/archive"
"github.com/sirupsen/logrus"
"github.com/vbauerster/mpb/v6"
"github.com/vbauerster/mpb/v6/decor"
)
// GenericDownload is used when a user provides a URL
// or path for an image
type GenericDownload struct {
Download
}
// NewGenericDownloader is used when the disk image is provided by the user
func NewGenericDownloader(vmType, vmName, pullPath string) (DistributionDownload, error) {
var (
imageName string
)
dataDir, err := GetDataDir(vmType)
if err != nil {
return nil, err
}
dl := Download{}
// Is pullpath a file or url?
getURL, err := url2.Parse(pullPath)
if err != nil {
return nil, err
}
if len(getURL.Scheme) > 0 {
urlSplit := strings.Split(pullPath, "/")
imageName = urlSplit[len(urlSplit)-1]
dl.LocalUncompressedFile = filepath.Join(dataDir, imageName)
dl.URL = getURL
dl.LocalPath = filepath.Join(dataDir, imageName)
} else {
// Dealing with FilePath
imageName = filepath.Base(pullPath)
dl.LocalUncompressedFile = filepath.Join(dataDir, imageName)
dl.LocalPath = pullPath
}
dl.VMName = vmName
dl.ImageName = imageName
// The download needs to be pulled into the datadir
gd := GenericDownload{Download: dl}
gd.LocalUncompressedFile = gd.getLocalUncompressedName()
return gd, nil
}
func (g GenericDownload) getLocalUncompressedName() string {
var (
extension string
)
switch {
case strings.HasSuffix(g.LocalPath, ".bz2"):
extension = ".bz2"
case strings.HasSuffix(g.LocalPath, ".gz"):
extension = ".gz"
case strings.HasSuffix(g.LocalPath, ".xz"):
extension = ".xz"
}
uncompressedFilename := filepath.Join(filepath.Dir(g.LocalUncompressedFile), g.VMName+"_"+g.ImageName)
return strings.TrimSuffix(uncompressedFilename, extension)
}
func (g GenericDownload) DownloadImage() error {
// If we have a URL for this "downloader", we now pull it
if g.URL != nil {
if err := DownloadVMImage(g.URL, g.LocalPath); err != nil {
return err
}
}
return Decompress(g.LocalPath, g.getLocalUncompressedName())
}
func (g GenericDownload) Get() *Download {
return &g.Download
}
// DownloadVMImage downloads a VM image from url to given path
// with download status
func DownloadVMImage(downloadURL fmt.Stringer, localImagePath string) error {
out, err := os.Create(localImagePath)
if err != nil {
return err
}
defer func() {
if err := out.Close(); err != nil {
logrus.Error(err)
}
}()
resp, err := http.Get(downloadURL.String())
if err != nil {
return err
}
defer func() {
if err := resp.Body.Close(); err != nil {
logrus.Error(err)
}
}()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("error downloading VM image %s: %s", downloadURL, resp.Status)
}
size := resp.ContentLength
urlSplit := strings.Split(downloadURL.String(), "/")
prefix := "Downloading VM image: " + urlSplit[len(urlSplit)-1]
onComplete := prefix + ": done"
p := mpb.New(
mpb.WithWidth(60),
mpb.WithRefreshRate(180*time.Millisecond),
)
bar := p.AddBar(size,
mpb.BarFillerClearOnComplete(),
mpb.PrependDecorators(
decor.OnComplete(decor.Name(prefix), onComplete),
),
mpb.AppendDecorators(
decor.OnComplete(decor.CountersKibiByte("%.1f / %.1f"), ""),
),
)
proxyReader := bar.ProxyReader(resp.Body)
defer func() {
if err := proxyReader.Close(); err != nil {
logrus.Error(err)
}
}()
if _, err := io.Copy(out, proxyReader); err != nil {
return err
}
p.Wait()
return nil
}
func Decompress(localPath, uncompressedPath string) error {
uncompressedFileWriter, err := os.OpenFile(uncompressedPath, os.O_CREATE|os.O_RDWR, 0600)
if err != nil {
return err
}
sourceFile, err := ioutil.ReadFile(localPath)
if err != nil {
return err
}
compressionType := archive.DetectCompression(sourceFile)
if compressionType != archive.Uncompressed {
fmt.Println("Extracting compressed file")
}
if compressionType == archive.Xz {
return decompressXZ(localPath, uncompressedFileWriter)
}
return decompressEverythingElse(localPath, uncompressedFileWriter)
}
// Will error out if file without .xz already exists
// Maybe extracting then renameing is a good idea here..
// depends on xz: not pre-installed on mac, so it becomes a brew dependency
func decompressXZ(src string, output io.Writer) error {
cmd := exec.Command("xzcat", "-k", src)
//cmd := exec.Command("xz", "-d", "-k", "-v", src)
stdOut, err := cmd.StdoutPipe()
if err != nil {
return err
}
//cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
go func() {
if _, err := io.Copy(output, stdOut); err != nil {
logrus.Error(err)
}
}()
return cmd.Run()
}
func decompressEverythingElse(src string, output io.Writer) error {
f, err := os.Open(src)
if err != nil {
return err
}
uncompressStream, _, err := compression.AutoDecompress(f)
if err != nil {
return err
}
defer func() {
if err := uncompressStream.Close(); err != nil {
logrus.Error(err)
}
}()
_, err = io.Copy(output, uncompressStream)
return err
}
|
