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pull.go
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pull.go
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//go:build amd64 || arm64
package machine
import (
"errors"
"fmt"
"io"
"net/http"
url2 "net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/containers/podman/v5/pkg/machine/compression"
"github.com/containers/podman/v5/pkg/machine/define"
"github.com/containers/podman/v5/pkg/machine/env"
"github.com/containers/podman/v5/pkg/machine/ocipull"
"github.com/containers/podman/v5/utils"
"github.com/sirupsen/logrus"
)
// 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 define.VMType, vmName, pullPath string) (DistributionDownload, error) {
var (
imageName string
)
dataDir, err := env.GetDataDir(vmType)
if err != nil {
return nil, err
}
cacheDir, err := env.GetCacheDir(vmType)
if err != nil {
return nil, err
}
dl := Download{}
// Is pullpath a file or url?
if getURL := supportedURL(pullPath); getURL != nil {
urlSplit := strings.Split(getURL.Path, "/")
imageName = urlSplit[len(urlSplit)-1]
dl.URL = getURL
dl.LocalPath = filepath.Join(cacheDir, imageName)
} else {
// Dealing with FilePath
imageName = filepath.Base(pullPath)
dl.LocalPath = pullPath
}
dl.VMName = vmName
dl.ImageName = imageName
dl.LocalUncompressedFile = dl.GetLocalUncompressedFile(dataDir)
// The download needs to be pulled into the datadir
gd := GenericDownload{Download: dl}
return gd, nil
}
func supportedURL(path string) (url *url2.URL) {
getURL, err := url2.Parse(path)
if err != nil {
// ignore error, probably not a URL, fallback & treat as file path
return nil
}
// Check supported scheme. Since URL is passed to net.http, only http
// schemes are supported. Also, windows drive paths can resemble a
// URL, but with a single letter scheme. These values should be
// passed through for interpretation as a file path.
switch getURL.Scheme {
case "http":
fallthrough
case "https":
return getURL
default:
return nil
}
}
func (dl Download) GetLocalUncompressedFile(dataDir string) string {
compressedFilename := dl.VMName + "_" + dl.ImageName
extension := compression.KindFromFile(compressedFilename)
uncompressedFile := strings.TrimSuffix(compressedFilename, fmt.Sprintf(".%s", extension.String()))
dl.LocalUncompressedFile = filepath.Join(dataDir, uncompressedFile)
return dl.LocalUncompressedFile
}
func (g GenericDownload) Get() *Download {
return &g.Download
}
func (g GenericDownload) HasUsableCache() (bool, error) {
// If we have a URL for this "downloader", we now pull it
return g.URL == nil, nil
}
// CleanCache cleans out downloaded uncompressed image files
func (g GenericDownload) CleanCache() error {
// Remove any image that has been downloaded via URL
// We never read from cache for generic downloads
if g.URL != nil {
if err := os.Remove(g.LocalPath); err != nil && !errors.Is(err, os.ErrNotExist) {
return err
}
}
return nil
}
func DownloadImage(d DistributionDownload) error {
// check if the latest image is already present
ok, err := d.HasUsableCache()
if err != nil {
return err
}
if !ok {
if err := DownloadVMImage(d.Get().URL, d.Get().ImageName, d.Get().LocalPath); err != nil {
return err
}
// Clean out old cached images, since we didn't find needed image in cache
defer func() {
if err = d.CleanCache(); err != nil {
logrus.Warnf("error cleaning machine image cache: %s", err)
}
}()
}
localPath, err := define.NewMachineFile(d.Get().LocalPath, nil)
if err != nil {
return err
}
return compression.Decompress(localPath, d.Get().LocalUncompressedFile)
}
// DownloadVMImage downloads a VM image from url to given path
// with download status
func DownloadVMImage(downloadURL *url2.URL, imageName string, 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("downloading VM image %s: %s", downloadURL, resp.Status)
}
size := resp.ContentLength
prefix := "Downloading VM image: " + imageName
onComplete := prefix + ": done"
p, bar := utils.ProgressBar(prefix, size, onComplete)
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 RemoveImageAfterExpire(dir string, expire time.Duration) error {
now := time.Now()
err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
// Delete any cache files that are older than expiry date
if !info.IsDir() && (now.Sub(info.ModTime()) > expire) {
err := os.Remove(path)
if err != nil && !errors.Is(err, os.ErrNotExist) {
logrus.Warnf("unable to clean up cached image: %s", path)
} else {
logrus.Debugf("cleaning up cached image: %s", path)
}
}
return nil
})
return err
}
// AcquireAlternateImage downloads the alternate image the user provided, which
// can be a file path or URL
func (dl Download) AcquireAlternateImage(inputPath string) (*define.VMFile, error) {
g, err := NewGenericDownloader(dl.VMKind, dl.VMName, inputPath)
if err != nil {
return nil, err
}
imagePath, err := define.NewMachineFile(g.Get().LocalUncompressedFile, nil)
if err != nil {
return nil, err
}
if err := DownloadImage(g); err != nil {
return nil, err
}
return imagePath, nil
}
func isOci(input string) (bool, *ocipull.OCIKind, error) { //nolint:unused
inputURL, err := url2.Parse(input)
if err != nil {
return false, nil, err
}
switch inputURL.Scheme {
case ocipull.OCIDir.String():
return true, &ocipull.OCIDir, nil
case ocipull.OCIRegistry.String():
return true, &ocipull.OCIRegistry, nil
}
return false, nil, nil
}