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package sources
import (
"errors"
"fmt"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"sort"
"strings"
"github.com/antchfx/htmlquery"
"github.com/lxc/distrobuilder/shared"
)
type archlinux struct {
common
}
// Run downloads an Arch Linux tarball.
func (s *archlinux) Run() error {
release := s.definition.Image.Release
// Releases are only available for the x86_64 architecture. ARM only has
// a "latest" tarball.
if s.definition.Image.ArchitectureMapped == "x86_64" && release == "" {
var err error
// Get latest release
release, err = s.getLatestRelease(s.definition.Source.URL, s.definition.Image.ArchitectureMapped)
if err != nil {
return fmt.Errorf("Failed to get latest release: %w", err)
}
}
var fname string
var tarball string
if s.definition.Image.ArchitectureMapped == "x86_64" {
fname = fmt.Sprintf("archlinux-bootstrap-%s-%s.tar.zst",
release, s.definition.Image.ArchitectureMapped)
tarball = fmt.Sprintf("%s/%s/%s", s.definition.Source.URL,
release, fname)
} else {
fname = fmt.Sprintf("ArchLinuxARM-%s-latest.tar.gz",
s.definition.Image.ArchitectureMapped)
tarball = fmt.Sprintf("%s/os/%s", s.definition.Source.URL, fname)
}
url, err := url.Parse(tarball)
if err != nil {
return fmt.Errorf("Failed to parse URL %q: %w", tarball, err)
}
if !s.definition.Source.SkipVerification && url.Scheme != "https" &&
len(s.definition.Source.Keys) == 0 {
return errors.New("GPG keys are required if downloading from HTTP")
}
fpath, err := s.DownloadHash(s.definition.Image, tarball, "", nil)
if err != nil {
return fmt.Errorf("Failed to download %q: %w", tarball, err)
}
// Force gpg checks when using http
if !s.definition.Source.SkipVerification && url.Scheme != "https" {
_, err = s.DownloadHash(s.definition.Image, tarball+".sig", "", nil)
if err != nil {
return fmt.Errorf("Failed downloading %q: %w", tarball+".sig", err)
}
valid, err := s.VerifyFile(
filepath.Join(fpath, fname),
filepath.Join(fpath, fname+".sig"))
if err != nil {
return fmt.Errorf("Failed to verify %q: %w", fname, err)
}
if !valid {
return fmt.Errorf("Invalid signature for %q", fname)
}
}
s.logger.WithField("file", filepath.Join(fpath, fname)).Info("Unpacking image")
// Unpack
err = shared.Unpack(filepath.Join(fpath, fname), s.rootfsDir)
if err != nil {
return fmt.Errorf("Failed to unpack file %q: %w", filepath.Join(fpath, fname), err)
}
// Move everything inside 'root.<architecture>' (which was is the tarball) to its
// parent directory
files, err := filepath.Glob(fmt.Sprintf("%s/*", filepath.Join(s.rootfsDir,
"root."+s.definition.Image.ArchitectureMapped)))
if err != nil {
return fmt.Errorf("Failed to get files: %w", err)
}
for _, file := range files {
err = os.Rename(file, filepath.Join(s.rootfsDir, path.Base(file)))
if err != nil {
return fmt.Errorf("Failed to rename file %q: %w", file, err)
}
}
path := filepath.Join(s.rootfsDir, "root."+s.definition.Image.ArchitectureMapped)
err = os.RemoveAll(path)
if err != nil {
return fmt.Errorf("Failed to remove %q: %w", path, err)
}
return nil
}
func (s *archlinux) getLatestRelease(URL string, arch string) (string, error) {
doc, err := htmlquery.LoadURL(URL)
if err != nil {
return "", fmt.Errorf("Failed to load URL %q: %w", URL, err)
}
re := regexp.MustCompile(`^\d{4}\.\d{2}\.\d{2}/?$`)
var releases []string
for _, node := range htmlquery.Find(doc, `//a[@href]/text()`) {
if re.MatchString(node.Data) {
releases = append(releases, strings.TrimSuffix(node.Data, "/"))
}
}
if len(releases) == 0 {
return "", errors.New("Failed to determine latest release")
}
// Sort releases in case they're out-of-order
sort.Strings(releases)
return releases[len(releases)-1], nil
}
|
