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|
//go:build amd64 || arm64
// +build amd64 arm64
package machine
import (
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"path/filepath"
"regexp"
"github.com/sirupsen/logrus"
)
const (
githubURL = "http://github.com/fedora-cloud/docker-brew-fedora/"
)
var fedoraxzRegex = regexp.MustCompile(`fedora[^\"]+xz`)
type FedoraDownload struct {
Download
}
func NewFedoraDownloader(vmType, vmName, releaseStream string) (DistributionDownload, error) {
imageName, downloadURL, size, err := getFedoraDownload(releaseStream)
if err != nil {
return nil, err
}
dataDir, err := GetDataDir(vmType)
if err != nil {
return nil, err
}
f := FedoraDownload{
Download: Download{
Arch: getFcosArch(),
Artifact: artifact,
Format: Format,
ImageName: imageName,
LocalPath: filepath.Join(dataDir, imageName),
URL: downloadURL,
VMName: vmName,
Size: size,
},
}
f.Download.LocalUncompressedFile = f.getLocalUncompressedName()
return f, nil
}
func (f FedoraDownload) Get() *Download {
return &f.Download
}
func (f FedoraDownload) HasUsableCache() (bool, error) {
info, err := os.Stat(f.LocalPath)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return false, nil
}
return false, err
}
return info.Size() == f.Size, nil
}
func truncRead(url string) ([]byte, error) {
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer func() {
if err := resp.Body.Close(); err != nil {
logrus.Error(err)
}
}()
body, err := ioutil.ReadAll(io.LimitReader(resp.Body, 10*1024*1024))
if err != nil {
return nil, err
}
_, _ = io.Copy(io.Discard, resp.Body)
return body, nil
}
func getFedoraDownload(releaseStream string) (string, *url.URL, int64, error) {
dirURL := githubURL + "tree/" + releaseStream + "/" + getFcosArch() + "/"
body, err := truncRead(dirURL)
if err != nil {
return "", nil, -1, err
}
file := fedoraxzRegex.FindString(string(body))
if len(file) == 0 {
return "", nil, -1, fmt.Errorf("could not locate Fedora download at %s", dirURL)
}
rawURL := githubURL + "raw/" + releaseStream + "/" + getFcosArch() + "/"
newLocation := rawURL + file
downloadURL, err := url.Parse(newLocation)
if err != nil {
return "", nil, -1, fmt.Errorf("invalid URL generated from discovered Fedora file: %s: %w", newLocation, err)
}
resp, err := http.Head(newLocation)
if err != nil {
return "", nil, -1, fmt.Errorf("head request failed: %s: %w", newLocation, err)
}
_ = resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return "", nil, -1, fmt.Errorf("head request failed [%d] on download: %s", resp.StatusCode, newLocation)
}
return file, downloadURL, resp.ContentLength, nil
}
|
