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builder.go
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builder.go
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package image
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path"
"path/filepath"
"strings"
"time"
"github.com/containers/image/v5/copy"
imagedocker "github.com/containers/image/v5/docker"
dockerref "github.com/containers/image/v5/docker/reference"
"github.com/containers/image/v5/signature"
"github.com/containers/image/v5/transports/alltransports"
"github.com/containers/image/v5/types"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/api/errcode"
"github.com/pkg/errors"
"github.com/replicatedhq/kots/pkg/docker/registry"
"github.com/replicatedhq/kots/pkg/k8sdoc"
"github.com/replicatedhq/kots/pkg/logger"
kustomizeimage "sigs.k8s.io/kustomize/api/types"
)
var imagePolicy = []byte(`{
"default": [{"type": "insecureAcceptAnything"}]
}`)
type ImageRef struct {
Domain string
Name string
Tag string
Digest string
}
type RegistryAuth struct {
Username string
Password string
}
type ImageInfo struct {
IsPrivate bool
}
func CopyImages(srcRegistry, destRegistry registry.RegistryOptions, appSlug string, log *logger.Logger, reportWriter io.Writer, upstreamDir string, additionalImages []string, dryRun, allImagesPrivate bool, checkedImages map[string]ImageInfo) ([]kustomizeimage.Image, error) {
newImages := []kustomizeimage.Image{}
err := filepath.Walk(upstreamDir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
contents, err := ioutil.ReadFile(path)
if err != nil {
return err
}
newImagesSubset, err := copyImagesInFileBetweenRegistries(srcRegistry, destRegistry, appSlug, log, reportWriter, contents, dryRun, allImagesPrivate, checkedImages, newImages)
if err != nil {
return errors.Wrapf(err, "failed to copy images mentioned in %s", path)
}
newImages = append(newImages, newImagesSubset...)
return nil
})
if err != nil {
return nil, errors.Wrap(err, "failed to walk upstream dir")
}
for _, additionalImage := range additionalImages {
newImagesSubset, err := copyImageBetweenRegistries(srcRegistry, destRegistry, appSlug, log, reportWriter, additionalImage, dryRun, allImagesPrivate, checkedImages)
if err != nil {
return nil, errors.Wrapf(err, "failed to addditional image: %s", additionalImage)
}
newImages = append(newImages, newImagesSubset...)
}
return newImages, nil
}
func GetPrivateImages(upstreamDir string, checkedImages map[string]ImageInfo, allPrivate bool) ([]string, []k8sdoc.K8sDoc, error) {
uniqueImages := make(map[string]bool)
objects := make([]k8sdoc.K8sDoc, 0) // all objects where images are referenced from
err := filepath.Walk(upstreamDir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
contents, err := ioutil.ReadFile(path)
if err != nil {
return err
}
return listImagesInFile(contents, func(images []string, doc k8sdoc.K8sDoc) error {
numPrivateImages := 0
for idx, image := range images {
if allPrivate {
checkedImages[image] = ImageInfo{
IsPrivate: true,
}
numPrivateImages = numPrivateImages + 1
uniqueImages[image] = true
continue
}
isPrivate := false
if i, ok := checkedImages[image]; ok {
isPrivate = i.IsPrivate
} else {
p, err := IsPrivateImage(image)
if err != nil {
return errors.Wrapf(err, "failed to check if image %d of %d in %q is private", idx+1, len(images), info.Name())
}
isPrivate = p
checkedImages[image] = ImageInfo{
IsPrivate: p,
}
}
if !isPrivate {
continue
}
numPrivateImages = numPrivateImages + 1
uniqueImages[image] = true
}
if numPrivateImages == 0 {
return nil
}
objects = append(objects, doc)
return nil
})
})
if err != nil {
return nil, nil, errors.Wrap(err, "failed to walk upstream dir")
}
result := make([]string, 0, len(uniqueImages))
for i := range uniqueImages {
result = append(result, i)
}
return result, objects, nil
}
func GetObjectsWithImages(upstreamDir string) ([]k8sdoc.K8sDoc, error) {
objects := make([]k8sdoc.K8sDoc, 0)
err := filepath.Walk(upstreamDir,
func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsDir() {
return nil
}
contents, err := ioutil.ReadFile(path)
if err != nil {
return err
}
return listImagesInFile(contents, func(images []string, doc k8sdoc.K8sDoc) error {
if len(images) > 0 {
objects = append(objects, doc)
}
return nil
})
})
if err != nil {
return nil, errors.Wrap(err, "failed to walk upstream dir")
}
return objects, nil
}
func copyImageBetweenRegistries(srcRegistry, destRegistry registry.RegistryOptions, appSlug string, log *logger.Logger, reportWriter io.Writer, imageName string, dryRun, allImagesPrivate bool, checkedImages map[string]ImageInfo) ([]kustomizeimage.Image, error) {
newImage, err := copyOneImage(srcRegistry, destRegistry, imageName, appSlug, reportWriter, log, dryRun, allImagesPrivate, checkedImages)
if err != nil {
log.FinishChildSpinner()
return nil, errors.Wrapf(err, "failed to transfer image %s", imageName)
}
return newImage, nil
}
func copyImagesInFileBetweenRegistries(srcRegistry, destRegistry registry.RegistryOptions, appSlug string, log *logger.Logger, reportWriter io.Writer, fileData []byte, dryRun, allImagesPrivate bool, checkedImages map[string]ImageInfo, alreadyPushedImagesFromOtherFiles []kustomizeimage.Image) ([]kustomizeimage.Image, error) {
savedImages := make(map[string]bool)
newImages := []kustomizeimage.Image{}
for _, image := range alreadyPushedImagesFromOtherFiles {
savedImages[fmt.Sprintf("%s:%s", image.Name, image.NewTag)] = true
}
err := listImagesInFile(fileData, func(images []string, doc k8sdoc.K8sDoc) error {
for _, image := range images {
if _, saved := savedImages[image]; saved {
continue
}
log.ChildActionWithSpinner("Transferring image %s", image)
newImage, err := copyOneImage(srcRegistry, destRegistry, image, appSlug, reportWriter, log, dryRun, allImagesPrivate, checkedImages)
if err != nil {
log.FinishChildSpinner()
return errors.Wrapf(err, "failed to transfer image %s", image)
}
if newImage != nil {
newImages = append(newImages, newImage...)
}
log.FinishChildSpinner()
savedImages[image] = true
}
return nil
})
return newImages, err
}
type processImagesFunc func([]string, k8sdoc.K8sDoc) error
func listImagesInFile(contents []byte, handler processImagesFunc) error {
yamlDocs := bytes.Split(contents, []byte("\n---\n"))
for _, yamlDoc := range yamlDocs {
parsed, err := k8sdoc.ParseYAML(yamlDoc)
if err != nil {
continue
}
images := parsed.ListImages()
if err := handler(images, parsed); err != nil {
return err
}
}
return nil
}
func copyOneImage(srcRegistry, destRegistry registry.RegistryOptions, image string, appSlug string, reportWriter io.Writer, log *logger.Logger, dryRun, allImagesPrivate bool, checkedImages map[string]ImageInfo) ([]kustomizeimage.Image, error) {
policy, err := signature.NewPolicyFromBytes(imagePolicy)
if err != nil {
return nil, errors.Wrap(err, "failed to read default policy")
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
return nil, errors.Wrap(err, "failed to create policy")
}
sourceCtx := &types.SystemContext{DockerDisableV1Ping: true}
// allow pulling images from http/invalid https docker repos
// intended for development only, _THIS MAKES THINGS INSECURE_
if os.Getenv("KOTSADM_INSECURE_SRCREGISTRY") == "true" {
sourceCtx.DockerInsecureSkipTLSVerify = types.OptionalBoolTrue
}
isPrivate := allImagesPrivate // rewrite all images with airgap
if i, ok := checkedImages[image]; ok {
isPrivate = i.IsPrivate
} else {
if !allImagesPrivate {
p, err := IsPrivateImage(image)
if err != nil {
return nil, errors.Wrap(err, "failed to check if image is private")
}
isPrivate = p
}
checkedImages[image] = ImageInfo{
IsPrivate: isPrivate,
}
}
// TODO: This reaches out to internet in airgap installs. It shouldn't.
sourceImage := image
if isPrivate {
sourceCtx.DockerAuthConfig = &types.DockerAuthConfig{
Username: srcRegistry.Username,
Password: srcRegistry.Password,
}
rewritten, err := RewritePrivateImage(srcRegistry, image, appSlug)
if err != nil {
return nil, errors.Wrap(err, "failed to rewrite private image")
}
sourceImage = rewritten
}
srcRef, err := alltransports.ParseImageName(fmt.Sprintf("docker://%s", sourceImage))
if err != nil {
return nil, errors.Wrapf(err, "failed to parse source image name %s", sourceImage)
}
destStr := fmt.Sprintf("docker://%s", DestRef(destRegistry, image))
destRef, err := alltransports.ParseImageName(destStr)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse dest image name %s", destStr)
}
destCtx := &types.SystemContext{
DockerInsecureSkipTLSVerify: types.OptionalBoolTrue,
DockerDisableV1Ping: true,
}
if destRegistry.Username != "" && destRegistry.Password != "" {
username, password := destRegistry.Username, destRegistry.Password
registryHost := reference.Domain(destRef.DockerReference())
if registry.IsECREndpoint(registryHost) {
login, err := registry.GetECRLogin(registryHost, username, password)
if err != nil {
return nil, errors.Wrap(err, "failed to get ECR login")
}
username = login.Username
password = login.Password
}
destCtx.DockerAuthConfig = &types.DockerAuthConfig{
Username: username,
Password: password,
}
}
if dryRun {
return kustomizeImage(destRegistry, image)
}
_, err = copy.Image(context.Background(), policyContext, destRef, srcRef, ©.Options{
RemoveSignatures: true,
SignBy: "",
ReportWriter: reportWriter,
SourceCtx: sourceCtx,
DestinationCtx: destCtx,
ForceManifestMIMEType: "",
})
if err != nil {
log.Info("failed to copy image directly with error %q, attempting fallback transfer method", err.Error())
// direct image copy failed
// attempt to download image to a temp directory, and then upload it from there
// this implicitly causes an image format conversion
// make a temp directory
tempDir, err := ioutil.TempDir("", "temp-image-pull")
if err != nil {
return nil, errors.Wrapf(err, "temp directory %s not created", tempDir)
}
defer os.RemoveAll(tempDir)
destPath := path.Join(tempDir, "temp-archive-image")
destStr := fmt.Sprintf("docker-archive:%s", destPath)
localRef, err := alltransports.ParseImageName(destStr)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse local image name: %s", destStr)
}
// copy image from remote to local
_, err = copy.Image(context.Background(), policyContext, localRef, srcRef, ©.Options{
RemoveSignatures: true,
SignBy: "",
ReportWriter: reportWriter,
SourceCtx: sourceCtx,
DestinationCtx: nil,
ForceManifestMIMEType: "",
})
if err != nil {
return nil, errors.Wrapf(err, "failed to download image")
}
// copy image from local to remote
_, err = copy.Image(context.Background(), policyContext, destRef, localRef, ©.Options{
RemoveSignatures: true,
SignBy: "",
ReportWriter: reportWriter,
SourceCtx: nil,
DestinationCtx: destCtx,
ForceManifestMIMEType: "",
})
if err != nil {
return nil, errors.Wrapf(err, "failed to push image")
}
}
return kustomizeImage(destRegistry, image)
}
func RefFromImage(image string) (*ImageRef, error) {
ref := &ImageRef{}
// named, err := reference.ParseNormalizedNamed(image)
parsed, err := reference.ParseAnyReference(image)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse image ref %q", image)
}
if named, ok := parsed.(reference.Named); ok {
ref.Domain = reference.Domain(named)
ref.Name = named.Name()
} else {
return nil, errors.New(fmt.Sprintf("unsupported ref type: %T", parsed))
}
if tagged, ok := parsed.(reference.Tagged); ok {
ref.Tag = tagged.Tag()
} else if can, ok := parsed.(reference.Canonical); ok {
ref.Digest = can.Digest().String()
} else {
ref.Tag = "latest"
}
return ref, nil
}
func (ref *ImageRef) pathInBundle(formatPrefix string) string {
path := []string{formatPrefix, ref.Name}
if ref.Tag != "" {
path = append(path, ref.Tag)
}
if ref.Digest != "" {
digestParts := strings.Split(ref.Digest, ":")
path = append(path, digestParts...)
}
return filepath.Join(path...)
}
func (ref *ImageRef) NameBase() string {
return path.Base(ref.Name)
}
func (ref *ImageRef) String() string {
refStr := ref.Name
if ref.Tag != "" {
refStr = fmt.Sprintf("%s:%s", refStr, ref.Tag)
} else if ref.Domain != "" {
refStr = fmt.Sprintf("%s@%s", refStr, ref.Digest)
}
return refStr
}
func CopyFromFileToRegistry(path string, name string, tag string, digest string, auth RegistryAuth, reportWriter io.Writer) error {
policy, err := signature.NewPolicyFromBytes(imagePolicy)
if err != nil {
return errors.Wrap(err, "failed to read default policy")
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
return errors.Wrap(err, "failed to create policy")
}
srcRef, err := alltransports.ParseImageName(fmt.Sprintf("docker-archive:%s", path))
if err != nil {
return errors.Wrap(err, "failed to parse src image name")
}
destStr := fmt.Sprintf("docker://%s:%s", name, tag)
destRef, err := alltransports.ParseImageName(destStr)
if err != nil {
return errors.Wrapf(err, "failed to parse dest image name %s", destStr)
}
destCtx := &types.SystemContext{
DockerInsecureSkipTLSVerify: types.OptionalBoolTrue,
DockerDisableV1Ping: true,
}
if auth.Username != "" && auth.Password != "" {
username, password := auth.Username, auth.Password
registryHost := reference.Domain(destRef.DockerReference())
if registry.IsECREndpoint(registryHost) {
login, err := registry.GetECRLogin(registryHost, username, password)
if err != nil {
return errors.Wrap(err, "failed to get ECR login")
}
username = login.Username
password = login.Password
}
destCtx.DockerAuthConfig = &types.DockerAuthConfig{
Username: username,
Password: password,
}
}
_, err = copy.Image(context.Background(), policyContext, destRef, srcRef, ©.Options{
RemoveSignatures: true,
SignBy: "",
ReportWriter: reportWriter,
SourceCtx: nil,
DestinationCtx: destCtx,
ForceManifestMIMEType: "",
})
if err != nil {
return errors.Wrap(err, "failed to copy image")
}
return nil
}
func IsPrivateImage(image string) (bool, error) {
var lastErr error
for i := 0; i < 3; i++ {
// ParseReference requires the // prefix
ref, err := imagedocker.ParseReference(fmt.Sprintf("//%s", image))
if err != nil {
return false, errors.Wrapf(err, "failed to parse image ref %q", image)
}
sysCtx := types.SystemContext{DockerDisableV1Ping: true}
// allow pulling images from http/invalid https docker repos
// intended for development only, _THIS MAKES THINGS INSECURE_
if os.Getenv("KOTSADM_INSECURE_SRCREGISTRY") == "true" {
sysCtx.DockerInsecureSkipTLSVerify = types.OptionalBoolTrue
}
remoteImage, err := ref.NewImage(context.Background(), &sysCtx)
if err == nil {
remoteImage.Close()
return false, nil
}
// manifest was downloaded, but no matching architecture found in manifest.
// still, not a private image
if strings.Contains(err.Error(), "no image found in manifest list for architecture") {
return false, nil
}
if strings.Contains(err.Error(), "EOF") {
lastErr = err
time.Sleep(1 * time.Second)
continue
}
if !isUnauthorized(err) {
return false, errors.Wrapf(err, "failed to create image from ref:%s", image)
}
return true, nil
}
return false, errors.Wrap(lastErr, "failed to retry")
}
func RewritePrivateImage(srcRegistry registry.RegistryOptions, image string, appSlug string) (string, error) {
ref, err := imagedocker.ParseReference(fmt.Sprintf("//%s", image))
if err != nil {
return "", errors.Wrapf(err, "failed to parse image ref %q", image)
}
registryHost := dockerref.Domain(ref.DockerReference())
if registryHost == srcRegistry.Endpoint {
// replicated images are also private, but we don't rewrite those
return image, nil
}
newImage := registry.MakeProxiedImageURL(srcRegistry.ProxyEndpoint, appSlug, image)
if tagged, ok := ref.DockerReference().(dockerref.Tagged); ok {
return newImage + ":" + tagged.Tag(), nil
} else if can, ok := ref.DockerReference().(reference.Canonical); ok {
return newImage + "@" + can.Digest().String(), nil
}
// no tag, so it will be "latest"
return newImage, nil
}
func isUnauthorized(err error) bool {
switch err := err.(type) {
case errcode.Errors:
for _, e := range err {
if isUnauthorized(e) {
return true
}
}
return false
case errcode.Error:
return err.Code.Descriptor().HTTPStatusCode == http.StatusUnauthorized
}
if _, ok := err.(imagedocker.ErrUnauthorizedForCredentials); ok {
return true
}
cause := errors.Cause(err)
if cause, ok := cause.(error); ok {
if cause == err {
return false
}
}
return isUnauthorized(cause)
}