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package machine
import (
"crypto/sha256"
"io/ioutil"
url2 "net/url"
"path/filepath"
"runtime"
"strings"
digest "github.com/opencontainers/go-digest"
)
// These should eventually be moved into machine/qemu as
// they are specific to running qemu
var (
artifact string = "qemu"
Format string = "qcow2.xz"
)
type FcosDownload struct {
Download
}
func NewFcosDownloader(vmType, vmName string) (DistributionDownload, error) {
info, err := getFCOSDownload()
if err != nil {
return nil, err
}
urlSplit := strings.Split(info.Location, "/")
imageName := urlSplit[len(urlSplit)-1]
url, err := url2.Parse(info.Location)
if err != nil {
return nil, err
}
dataDir, err := GetDataDir(vmType)
if err != nil {
return nil, err
}
fcd := FcosDownload{
Download: Download{
Arch: getFcosArch(),
Artifact: artifact,
Format: Format,
ImageName: imageName,
LocalPath: filepath.Join(dataDir, imageName),
Sha256sum: info.Sha256Sum,
URL: url,
VMName: vmName,
},
}
fcd.Download.LocalUncompressedFile = fcd.getLocalUncompressedName()
return fcd, nil
}
func (f FcosDownload) getLocalUncompressedName() string {
uncompressedFilename := filepath.Join(filepath.Dir(f.LocalPath), f.VMName+"_"+f.ImageName)
return strings.TrimSuffix(uncompressedFilename, ".xz")
}
func (f FcosDownload) DownloadImage() error {
// check if the latest image is already present
ok, err := UpdateAvailable(&f.Download)
if err != nil {
return err
}
if !ok {
if err := DownloadVMImage(f.URL, f.LocalPath); err != nil {
return err
}
}
return Decompress(f.LocalPath, f.getLocalUncompressedName())
}
func (f FcosDownload) Get() *Download {
return &f.Download
}
type fcosDownloadInfo struct {
CompressionType string
Location string
Release string
Sha256Sum string
}
func UpdateAvailable(d *Download) (bool, error) {
// check the sha of the local image if it exists
// get the sha of the remote image
// == dont bother to pull
files, err := ioutil.ReadDir(filepath.Dir(d.LocalPath))
if err != nil {
return false, err
}
for _, file := range files {
if filepath.Base(d.LocalPath) == file.Name() {
b, err := ioutil.ReadFile(d.LocalPath)
if err != nil {
return false, err
}
s := sha256.Sum256(b)
sum := digest.NewDigestFromBytes(digest.SHA256, s[:])
if sum.Encoded() == d.Sha256sum {
return true, nil
}
}
}
return false, nil
}
func getFcosArch() string {
var arch string
// TODO fill in more architectures
switch runtime.GOARCH {
case "arm64":
arch = "aarch64"
default:
arch = "x86_64"
}
return arch
}
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