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alpine-http.go
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alpine-http.go
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package sources
import (
"crypto/sha256"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/lxc/distrobuilder/shared"
)
type alpineLinux struct {
common
}
func (s *alpineLinux) Run() error {
var releaseShort string
releaseFull := s.definition.Image.Release
if s.definition.Image.Release == "edge" {
if s.definition.Source.SameAs == "" {
return errors.New("You can't use Alpine edge without setting same_as")
}
releaseFull = s.definition.Source.SameAs
}
releaseField := strings.Split(releaseFull, ".")
if len(releaseField) == 2 {
releaseShort = fmt.Sprintf("v%s", releaseFull)
} else if len(releaseField) == 3 {
releaseShort = fmt.Sprintf("v%s.%s", releaseField[0], releaseField[1])
} else {
return fmt.Errorf("Bad Alpine release: %s", releaseFull)
}
baseURL := fmt.Sprintf("%s/%s/releases/%s", s.definition.Source.URL, releaseShort, s.definition.Image.ArchitectureMapped)
if len(releaseField) == 2 {
var err error
releaseFull, err = s.getLatestRelease(baseURL, releaseFull, s.definition.Image.ArchitectureMapped)
if err != nil {
return fmt.Errorf("Failed to find latest release: %w", err)
}
}
fname := fmt.Sprintf("alpine-minirootfs-%s-%s.tar.gz", releaseFull, s.definition.Image.ArchitectureMapped)
tarball := fmt.Sprintf("%s/%s", baseURL, 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")
}
var fpath string
if s.definition.Source.SkipVerification {
fpath, err = s.DownloadHash(s.definition.Image, tarball, "", nil)
} else {
fpath, err = s.DownloadHash(s.definition.Image, tarball, tarball+".sha256", sha256.New())
}
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+".asc", "", nil)
if err != nil {
return fmt.Errorf("Failed downloading %q: %w", tarball+".asc", err)
}
valid, err := s.VerifyFile(
filepath.Join(fpath, fname),
filepath.Join(fpath, fname+".asc"))
if err != nil {
return fmt.Errorf("Failed to download %q: %w", tarball+".asc", err)
}
if !valid {
return fmt.Errorf("Invalid signature for %q", filepath.Join(fpath, 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 %q: %w", fname, err)
}
// Handle edge builds
if s.definition.Image.Release == "edge" {
// Upgrade to edge
exitChroot, err := shared.SetupChroot(s.rootfsDir, s.definition, nil)
if err != nil {
return fmt.Errorf("Failed to set up chroot: %w", err)
}
err = shared.RunCommand(s.ctx, nil, nil, "sed", "-i", "-e", "s/v[[:digit:]]\\.[[:digit:]]\\+/edge/g", "/etc/apk/repositories")
if err != nil {
{
err := exitChroot()
if err != nil {
s.logger.WithField("err", err).Warn("Failed exiting chroot")
}
}
return fmt.Errorf("Failed to edit apk repositories: %w", err)
}
err = shared.RunCommand(s.ctx, nil, nil, "apk", "upgrade", "--update-cache", "--available")
if err != nil {
{
err := exitChroot()
if err != nil {
s.logger.WithField("err", err).Warn("Failed exiting chroot")
}
}
return fmt.Errorf("Failed to upgrade edge build: %w", err)
}
err = exitChroot()
if err != nil {
return fmt.Errorf("Failed exiting chroot: %w", err)
}
}
// Fix bad permissions in Alpine tarballs
err = os.Chmod(s.rootfsDir, 0755)
if err != nil {
return fmt.Errorf("Failed to chmod %q: %w", s.rootfsDir, err)
}
return nil
}
func (s *alpineLinux) getLatestRelease(baseURL, release string, arch string) (string, error) {
var (
resp *http.Response
err error
)
err = shared.Retry(func() error {
resp, err = http.Get(baseURL)
if err != nil {
return fmt.Errorf("Failed to GET %q: %w", baseURL, err)
}
return nil
}, 3)
if err != nil {
return "", err
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("Failed to ready body: %w", err)
}
regex := regexp.MustCompile(fmt.Sprintf(">alpine-minirootfs-(%s\\.\\d+)-%s.tar.gz<", release, arch))
releases := regex.FindAllStringSubmatch(string(body), -1)
if len(releases) > 0 {
return releases[len(releases)-1][1], nil
}
return "", nil
}