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 } if compressionType := archive.DetectCompression(sourceFile); compressionType.Extension() == "tar.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 dependecy func decompressXZ(src string, output io.Writer) error { fmt.Println("Extracting compressed file") 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 { fmt.Println("Extracting compressed file") 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 }