/
voidlinux-http.go
117 lines (97 loc) · 2.73 KB
/
voidlinux-http.go
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package sources
import (
"crypto/sha256"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"path/filepath"
"regexp"
"strings"
lxd "github.com/lxc/lxd/shared"
"github.com/lxc/distrobuilder/shared"
)
// VoidLinuxHTTP represents the Alpine Linux downloader.
type VoidLinuxHTTP struct{}
// NewVoidLinuxHTTP creates a new VoidLinuxHTTP instance.
func NewVoidLinuxHTTP() *VoidLinuxHTTP {
return &VoidLinuxHTTP{}
}
// Run downloads a Void Linux rootfs tarball.
func (s *VoidLinuxHTTP) Run(definition shared.Definition, rootfsDir string) error {
baseURL := definition.Source.URL
fname, err := s.getLatestBuild(baseURL, definition.Image.ArchitectureMapped, definition.Source.Variant)
if err != nil {
return err
}
if fname == "" {
return errors.New("Failed to determine latest build")
}
tarball := fmt.Sprintf("%s/%s", baseURL, fname)
digests := fmt.Sprintf("%s/sha256.txt", baseURL)
signatures := fmt.Sprintf("%s/sha256.sig", baseURL)
url, err := url.Parse(tarball)
if err != nil {
return err
}
if !definition.Source.SkipVerification && url.Scheme != "https" &&
len(definition.Source.Keys) == 0 {
return errors.New("GPG keys are required if downloading from HTTP")
}
var fpath string
if definition.Source.SkipVerification {
fpath, err = shared.DownloadHash(definition.Image, tarball, "", nil)
} else {
fpath, err = shared.DownloadHash(definition.Image, tarball, digests, sha256.New())
}
if err != nil {
return err
}
// Force gpg checks when using http
if !definition.Source.SkipVerification && url.Scheme != "https" {
shared.DownloadHash(definition.Image, digests, "", nil)
shared.DownloadHash(definition.Image, signatures, "", nil)
valid, err := shared.VerifyFile(
filepath.Join(fpath, "sha256.txt"),
filepath.Join(fpath, "sha256.sig"),
definition.Source.Keys,
definition.Source.Keyserver)
if err != nil {
return err
}
if !valid {
return errors.New("Failed to verify tarball")
}
}
// Unpack
err = lxd.Unpack(filepath.Join(fpath, fname), rootfsDir, false, false, nil)
if err != nil {
return err
}
return nil
}
func (s *VoidLinuxHTTP) getLatestBuild(baseURL, arch, variant string) (string, error) {
resp, err := http.Get(baseURL)
if err != nil {
return "", err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
// Look for .tar.xz
selector := arch
if variant != "" {
selector = fmt.Sprintf("%s-%s", selector, variant)
}
regex := regexp.MustCompile(fmt.Sprintf(">void-%s-ROOTFS-.*.tar.xz<", selector))
// Find all rootfs related files
matches := regex.FindAllString(string(body), -1)
if len(matches) > 0 {
// Take the first match since they're all the same anyway
return strings.Trim(matches[0], "<>"), nil
}
return "", nil
}