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images.go
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images.go
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package dependencies
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"strings"
"github.com/0xPolygonHermez/zkevm-node/log"
"github.com/spf13/afero"
"gopkg.in/yaml.v3"
)
// ImagesConfig is the configuration for the images updater.
type ImagesConfig struct {
Names []string
TargetFilePath string
}
type imageUpdater struct {
fs afero.Fs
targetFilePath string
dockerUsername string
dockerPassword string
images []string
}
func newImageUpdater(images []string, targetFilePath string) *imageUpdater {
return &imageUpdater{
fs: afero.NewOsFs(),
targetFilePath: targetFilePath,
dockerUsername: os.Getenv("DOCKERHUB_USERNAME"),
dockerPassword: os.Getenv("DOCKERHUB_PASSWORD"),
images: images,
}
}
func (iu *imageUpdater) update() error {
for _, image := range iu.images {
if err := iu.updateImage(image); err != nil {
return err
}
}
return nil
}
func (iu *imageUpdater) updateImage(imageName string) error {
currentDigest, err := iu.readCurrentDigest(imageName)
if err != nil {
return err
}
remoteDigest, err := iu.readRemoteDigest(imageName)
if err != nil {
return err
}
if currentDigest != remoteDigest {
if err := iu.updateDigest(imageName, currentDigest, remoteDigest); err != nil {
return err
}
}
return nil
}
func (iu *imageUpdater) readCurrentDigest(imageName string) (string, error) {
data, err := afero.ReadFile(iu.fs, getTargetPath(iu.targetFilePath))
if err != nil {
return "", err
}
content := struct {
Version string
Services map[string]struct {
Image string
}
}{}
err = yaml.Unmarshal(data, &content)
if err != nil {
return "", err
}
for _, c := range content.Services {
if c.Image == "" {
continue
}
items := strings.Split(c.Image, "@")
const requiredItems = 2
if len(items) < requiredItems {
continue
}
if strings.HasPrefix(items[0], imageName) {
log.Infof("Current digest of %q is %q", imageName, items[1])
return items[1], nil
}
}
return "", fmt.Errorf("image %q not found in %q", imageName, iu.targetFilePath)
}
func (iu *imageUpdater) readRemoteDigest(imageName string) (string, error) {
err := iu.dockerLogin()
if err != nil {
return "", err
}
return iu.readLatestTag(imageName)
}
func (iu *imageUpdater) updateDigest(imageName, currentDigest, remoteDigest string) error {
targetFilePath := getTargetPath(iu.targetFilePath)
log.Infof("Updating %q...", targetFilePath)
oldContent, err := afero.ReadFile(iu.fs, targetFilePath)
if err != nil {
return err
}
oldImageField := fmt.Sprintf("%s@%s", imageName, currentDigest)
newImageField := fmt.Sprintf("%s@%s", imageName, remoteDigest)
newContent := strings.ReplaceAll(string(oldContent), oldImageField, newImageField)
return afero.WriteFile(iu.fs, targetFilePath, []byte(newContent), 0664) //nolint:gomnd
}
func (iu *imageUpdater) dockerLogin() error {
c := exec.Command("docker", "login", "--username", iu.dockerUsername, "--password-stdin") // #nosec G204
stdin, err := c.StdinPipe()
if err != nil {
return err
}
passReader := strings.NewReader(iu.dockerPassword)
_, err = io.Copy(stdin, passReader)
if err != nil {
return err
}
err = stdin.Close()
if err != nil {
return err
}
return c.Run()
}
type result struct {
RepoDigests []string
}
func (iu *imageUpdater) readLatestTag(imageName string) (string, error) {
c := exec.Command("docker", "pull", imageName) // #nosec G204
err := c.Run()
if err != nil {
return "", err
}
c = exec.Command("docker", "inspect", imageName) // #nosec G204
output, err := c.CombinedOutput()
if err != nil {
return "", err
}
reader := bytes.NewReader(output)
decoder := json.NewDecoder(reader)
r := struct {
Results []result
}{}
err = decoder.Decode(&r.Results)
if err != nil {
return "", err
}
items := strings.Split(r.Results[0].RepoDigests[0], "@")
const requiredItems = 2
if len(items) < requiredItems {
return "", fmt.Errorf("Returned image does not include digest %q", r.Results[0].RepoDigests[0])
}
log.Infof("Remote digest of %q is %q", imageName, items[1])
return items[1], nil
}