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package e2e
import (
"os"
"path/filepath"
"strings"
"encoding/json"
"fmt"
"io"
"net/http"
"runtime"
"github.com/opencontainers/go-digest"
"github.com/coreos/stream-metadata-go/fedoracoreos"
"github.com/coreos/stream-metadata-go/stream"
"github.com/sirupsen/logrus"
)
type FcosDownload struct {
DataDir string
}
type fcosDownloadInfo struct {
Location string
Sha256Sum string
}
func NewFcosDownloader(dataDir string) (*FcosDownload, error) {
return &FcosDownload{
DataDir: dataDir,
}, nil
}
func imageName(info *fcosDownloadInfo) string {
urlSplit := strings.Split(info.Location, "/")
return urlSplit[len(urlSplit)-1]
}
func (downloader *FcosDownload) DownloadImage() (string, error) {
info, err := getFCOSDownload()
if err != nil {
return "", err
}
compressedImage := filepath.Join(downloader.DataDir, imageName(info))
uncompressedImage := strings.TrimSuffix(filepath.Join(filepath.Dir(compressedImage), imageName(info)), ".xz")
// check if the latest image is already present
ok, err := downloader.updateAvailable(info, compressedImage)
if err != nil {
return "", err
}
if !ok {
if err := DownloadVMImage(info.Location, compressedImage); err != nil {
return "", err
}
}
if _, err := os.Stat(uncompressedImage); err == nil {
return uncompressedImage, nil
}
if err := Decompress(compressedImage, uncompressedImage); err != nil {
return "", err
}
return uncompressedImage, nil
}
func (downloader *FcosDownload) updateAvailable(info *fcosDownloadInfo, compressedImage string) (bool, error) {
// check the sha of the local image if it exists
// get the sha of the remote image
// == dont bother to pull
if _, err := os.Stat(compressedImage); os.IsNotExist(err) {
return false, nil
}
fd, err := os.Open(compressedImage)
if err != nil {
return false, err
}
defer fd.Close()
sum, err := digest.SHA256.FromReader(fd)
if err != nil {
return false, err
}
if sum.Encoded() == info.Sha256Sum {
return true, nil
}
return false, nil
}
// as of 2024-05-28, these are the 4 architectures available in
// curl https://builds.coreos.fedoraproject.org/streams/next.json
func coreosArch() string {
switch runtime.GOARCH {
case "amd64":
return "x86_64"
case "arm64":
return "aarch64"
case "ppc64le":
return "ppc64le"
case "s390x":
return "s390x"
}
panic(fmt.Sprintf("unknown arch: %s", runtime.GOOS))
}
// This should get Exported and stay put as it will apply to all fcos downloads
// getFCOS parses fedoraCoreOS's stream and returns the image download URL and the release version
func getFCOSDownload() (*fcosDownloadInfo, error) {
streamurl := fedoracoreos.GetStreamURL(fedoracoreos.StreamNext)
resp, err := http.Get(streamurl.String())
if err != nil {
return nil, err
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
defer func() {
if err := resp.Body.Close(); err != nil {
logrus.Error(err)
}
}()
var fcosstable stream.Stream
if err := json.Unmarshal(body, &fcosstable); err != nil {
return nil, err
}
arch, ok := fcosstable.Architectures[coreosArch()]
if !ok {
return nil, fmt.Errorf("unable to pull VM image: no targetArch in stream")
}
artifacts := arch.Artifacts
if artifacts == nil {
return nil, fmt.Errorf("unable to pull VM image: no artifact in stream")
}
qemu, ok := artifacts["qemu"]
if !ok {
return nil, fmt.Errorf("unable to pull VM image: no qemu artifact in stream")
}
formats := qemu.Formats
if formats == nil {
return nil, fmt.Errorf("unable to pull VM image: no formats in stream")
}
qcow, ok := formats["qcow2.xz"]
if !ok {
return nil, fmt.Errorf("unable to pull VM image: no qcow2.xz format in stream")
}
disk := qcow.Disk
if disk == nil {
return nil, fmt.Errorf("unable to pull VM image: no disk in stream")
}
return &fcosDownloadInfo{
Location: disk.Location,
Sha256Sum: disk.Sha256,
}, nil
}
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