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fetch.go
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fetch.go
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package registry
import (
"log"
"os"
"path"
"path/filepath"
"strings"
"github.com/BurntSushi/toml"
"github.com/google/go-containerregistry/pkg/authn"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/pkg/errors"
"github.com/pivotal/kpack/pkg/archive"
)
type contentType string
const (
ContentTypeLabelKey string = "source.contenttype.kpack.io"
zip contentType = "zip"
jar contentType = "jar"
war contentType = "war"
tar contentType = "tar"
targz contentType = "tar.gz"
)
type ImageClient interface {
Fetch(keychain authn.Keychain, repoName string) (v1.Image, string, error)
}
type Fetcher struct {
Logger *log.Logger
Client ImageClient
Keychain authn.Keychain
}
func (f *Fetcher) Fetch(dir, registryImage string, metadataDir string) error {
f.Logger.Printf("Pulling %s...", registryImage)
img, identifer, err := f.Client.Fetch(f.Keychain, registryImage)
if err != nil {
return err
}
parts := strings.SplitN(identifer, "@", 2)
ref, digest := parts[0], parts[1]
cType, err := getContentType(img)
if err != nil {
return err
}
var handler func(img v1.Image, dir string) error
switch cType {
case zip, jar, war:
handler = handleZip
case tar:
handler = handleTar
case targz:
handler = handleTarGZ
default:
handler = handleSource
}
if err = handler(img, dir); err != nil {
return err
}
projectMetadataFile, err := os.Create(path.Join(metadataDir, "project-metadata.toml"))
if err != nil {
return errors.Wrapf(err, "invalid metadata destination '%s/project-metadata.toml' for image: %s", metadataDir, registryImage)
}
defer projectMetadataFile.Close()
projectMd := Project{
Source: Source{
Type: "image",
Metadata: Metadata{
Image: ref,
},
Version: Version{
Digest: digest,
},
},
}
if err := toml.NewEncoder(projectMetadataFile).Encode(projectMd); err != nil {
return errors.Wrapf(err, "invalid metadata destination '%s/project-metadata.toml' for image: %s", metadataDir, registryImage)
}
f.Logger.Printf("Successfully pulled %s in path %q", registryImage, dir)
return nil
}
func getContentType(img v1.Image) (contentType, error) {
cfg, err := img.ConfigFile()
if err != nil {
return "", err
}
if cfg.Config.Labels == nil {
return "", nil
}
val, ok := cfg.Config.Labels[ContentTypeLabelKey]
if !ok {
return "", nil
}
return contentType(val), nil
}
func handleSource(img v1.Image, dir string) error {
layers, err := img.Layers()
if err != nil {
return err
}
for _, layer := range layers {
err := fetchLayer(layer, dir)
if err != nil {
return err
}
}
return nil
}
func handleZip(img v1.Image, dir string) error {
tmpDir, err := os.MkdirTemp("", "")
if err != nil {
return err
}
defer os.RemoveAll(tmpDir)
file, err := getSourceFile(img, tmpDir)
if err != nil {
return err
}
defer file.Close()
if !archive.IsZip(file.Name()) {
return errors.Errorf("expected file '%s' to be a zip archive", file.Name())
}
info, err := file.Stat()
if err != nil {
return err
}
return archive.ExtractZip(file, info.Size(), dir, 0)
}
func handleTar(img v1.Image, dir string) error {
tmpDir, err := os.MkdirTemp("", "")
if err != nil {
return err
}
defer os.RemoveAll(tmpDir)
file, err := getSourceFile(img, tmpDir)
if err != nil {
return err
}
defer file.Close()
if !archive.IsTar(file.Name()) {
return errors.Errorf("expected file '%s' to be a tar archive", file.Name())
}
return archive.ExtractTar(file, dir, 0)
}
func handleTarGZ(img v1.Image, dir string) error {
tmpDir, err := os.MkdirTemp("", "")
if err != nil {
return err
}
defer os.RemoveAll(tmpDir)
file, err := getSourceFile(img, tmpDir)
if err != nil {
return err
}
defer file.Close()
return archive.ExtractTarGZ(file, dir, 0)
}
func getSourceFile(img v1.Image, dir string) (*os.File, error) {
layers, err := img.Layers()
if err != nil {
return nil, err
}
if len(layers) != 1 {
return nil, errors.Errorf("expected image to have exactly one layer")
}
err = fetchLayer(layers[0], dir)
if err != nil {
return nil, err
}
infos, err := os.ReadDir(dir)
if err != nil {
return nil, err
}
if len(infos) != 1 {
return nil, errors.Errorf("expected layer to have exactly one file")
}
return os.Open(filepath.Join(dir, infos[0].Name()))
}
func fetchLayer(layer v1.Layer, dir string) error {
reader, err := layer.Uncompressed()
if err != nil {
return err
}
defer reader.Close()
return archive.ExtractTar(reader, dir, 0)
}
type Project struct {
Source Source `toml:"source"`
}
type Source struct {
Type string `toml:"type"`
Metadata Metadata `toml:"metadata"`
Version Version `toml:"version"`
}
type Metadata struct {
Image string `toml:"image"`
}
type Version struct {
Digest string `toml:"digest"`
}