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importimage.go
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importimage.go
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package importimage
import (
"fmt"
"strings"
"github.com/spf13/cobra"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/kubernetes/pkg/api/legacyscheme"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/printers"
imagev1 "github.com/openshift/api/image/v1"
imagev1client "github.com/openshift/client-go/image/clientset/versioned/typed/image/v1"
imageapi "github.com/openshift/origin/pkg/image/apis/image"
"github.com/openshift/origin/pkg/oc/cli/tag"
"github.com/openshift/origin/pkg/oc/lib/describe"
)
var (
importImageLong = templates.LongDesc(`
Import the latest image information from a tag in a Docker registry
Image streams allow you to control which images are rolled out to your builds
and applications. This command fetches the latest version of an image from a
remote repository and updates the image stream tag if it does not match the
previous value. Running the command multiple times will not create duplicate
entries. When importing an image, only the image metadata is copied, not the
image contents.
If you wish to change the image stream tag or provide more advanced options,
see the 'tag' command.`)
importImageExample = templates.Examples(`
%[1]s import-image mystream
`)
)
// ImageImportOptions contains all the necessary information to perform an import.
type ImportImageOptions struct {
PrintFlags *genericclioptions.PrintFlags
ToPrinter func(string) (printers.ResourcePrinter, error)
// user set values
From string
Confirm bool
All bool
Scheduled bool
Insecure bool
InsecureFlagProvided bool
DryRun bool
// internal values
Namespace string
Name string
Tag string
Target string
ReferencePolicy string
// helpers
imageClient imagev1client.ImageV1Interface
isClient imagev1client.ImageStreamInterface
genericclioptions.IOStreams
}
func NewImportImageOptions(name string, streams genericclioptions.IOStreams) *ImportImageOptions {
return &ImportImageOptions{
PrintFlags: genericclioptions.NewPrintFlags("imported"),
IOStreams: streams,
ReferencePolicy: tag.SourceReferencePolicy,
}
}
// NewCmdImportImage implements the OpenShift cli import-image command.
func NewCmdImportImage(fullName string, f kcmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewImportImageOptions(fullName, streams)
cmd := &cobra.Command{
Use: "import-image IMAGESTREAM[:TAG]",
Short: "Imports images from a Docker registry",
Long: importImageLong,
Example: fmt.Sprintf(importImageExample, fullName),
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(o.Complete(f, cmd, args))
kcmdutil.CheckErr(o.Validate())
kcmdutil.CheckErr(o.Run())
},
}
o.PrintFlags.AddFlags(cmd)
cmd.Flags().StringVar(&o.From, "from", o.From, "A Docker image repository to import images from")
cmd.Flags().BoolVar(&o.Confirm, "confirm", o.Confirm, "If true, allow the image stream import location to be set or changed")
cmd.Flags().BoolVar(&o.All, "all", o.All, "If true, import all tags from the provided source on creation or if --from is specified")
cmd.Flags().StringVar(&o.ReferencePolicy, "reference-policy", o.ReferencePolicy, "Allow to request pullthrough for external image when set to 'local'. Defaults to 'source'.")
cmd.Flags().BoolVar(&o.DryRun, "dry-run", o.DryRun, "Fetch information about images without creating or updating an image stream.")
cmd.Flags().BoolVar(&o.Scheduled, "scheduled", o.Scheduled, "Set each imported Docker image to be periodically imported from a remote repository. Defaults to false.")
cmd.Flags().BoolVar(&o.Insecure, "insecure", o.Insecure, "If true, allow importing from registries that have invalid HTTPS certificates or are hosted via HTTP. This flag will take precedence over the insecure annotation.")
return cmd
}
// Complete turns a partially defined ImportImageOptions into a solvent structure
// which can be validated and used for aa import.
func (o *ImportImageOptions) Complete(f kcmdutil.Factory, cmd *cobra.Command, args []string) error {
if len(args) > 0 {
o.Target = args[0]
}
o.InsecureFlagProvided = cmd.Flags().Lookup("insecure").Changed
if !cmd.Flags().Lookup("reference-policy").Changed {
o.ReferencePolicy = ""
}
clientConfig, err := f.ToRESTConfig()
if err != nil {
return err
}
o.Namespace, _, err = f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
o.imageClient, err = imagev1client.NewForConfig(clientConfig)
if err != nil {
return err
}
o.isClient = o.imageClient.ImageStreams(o.Namespace)
o.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {
o.PrintFlags.NamePrintFlags.Operation = operation
// We assume that the (dry run) message has already been added (if need be)
// by the caller of this method.
return o.PrintFlags.ToPrinter()
}
return o.parseImageReference()
}
func (o *ImportImageOptions) parseImageReference() error {
targetRef, err := imageapi.ParseDockerImageReference(o.Target)
switch {
case err != nil:
return fmt.Errorf("the image name must be a valid Docker image pull spec or reference to an image stream (e.g. myregistry/myteam/image:tag)")
case len(targetRef.ID) > 0:
return fmt.Errorf("to import images by ID, use the 'tag' command")
case len(targetRef.Tag) != 0 && o.All:
// error out
return fmt.Errorf("cannot specify a tag %q as well as --all", o.Target)
case len(targetRef.Tag) == 0 && !o.All:
// apply the default tag
targetRef.Tag = imageapi.DefaultImageTag
}
o.Name = targetRef.Name
o.Tag = targetRef.Tag
return nil
}
// Validate ensures that a ImportImageOptions is valid and can be used to execute
// an import.
func (o *ImportImageOptions) Validate() error {
if len(o.Target) == 0 {
return fmt.Errorf("you must specify the name of an image stream")
}
return nil
}
// Run contains all the necessary functionality for the OpenShift cli import-image command.
func (o *ImportImageOptions) Run() error {
stream, isi, err := o.createImageImport()
if err != nil {
return err
}
result, err := o.imageClient.ImageStreamImports(isi.Namespace).Create(isi)
if err != nil {
return err
}
message := "imported"
if wasError(result) {
message = "imported with errors"
}
if o.DryRun {
message = fmt.Sprintf("%s (dry run)", message)
}
message = fmt.Sprintf("%s\n\n", message)
if result.Status.Import != nil {
// TODO: remove once we have external describers
internalResult := &imageapi.ImageStreamImport{}
if legacyscheme.Scheme.Convert(result, internalResult, nil); err != nil {
return fmt.Errorf("unable to convert *v1.Image to internal object: %v", err)
}
// TODO: dry-run doesn't return an image stream, so we have to display partial results
info, err := describe.DescribeImageStream(internalResult.Status.Import)
if err != nil {
return err
}
message += fmt.Sprintln(info)
}
if repo := result.Status.Repository; repo != nil {
for _, image := range repo.Images {
if image.Image != nil {
// TODO: remove once we have external describers
var internalImage imageapi.Image
if legacyscheme.Scheme.Convert(image.Image, &internalImage, nil); err != nil {
return fmt.Errorf("unable to convert *v1.Image to internal object: %v", err)
}
info, err := describe.DescribeImage(&internalImage, imageapi.JoinImageStreamTag(stream.Name, image.Tag))
if err != nil {
fmt.Fprintf(o.ErrOut, "error: tag %s failed: %v\n", image.Tag, err)
} else {
message += fmt.Sprintln(info)
}
} else {
fmt.Fprintf(o.ErrOut, "error: repository tag %s failed: %v\n", image.Tag, image.Status.Message)
}
}
}
for _, image := range result.Status.Images {
if image.Image != nil {
// TODO: remove once we have external describers
var internalImage imageapi.Image
if legacyscheme.Scheme.Convert(image.Image, &internalImage, nil); err != nil {
return fmt.Errorf("unable to convert *v1.Image to internal object: %v", err)
}
info, err := describe.DescribeImage(&internalImage, imageapi.JoinImageStreamTag(stream.Name, image.Tag))
if err != nil {
fmt.Fprintf(o.ErrOut, "error: tag %s failed: %v\n", image.Tag, err)
} else {
message += fmt.Sprintln(info)
}
} else {
fmt.Fprintf(o.ErrOut, "error: tag %s failed: %v\n", image.Tag, image.Status.Message)
}
}
if r := result.Status.Repository; r != nil && len(r.AdditionalTags) > 0 {
message += fmt.Sprintf("\ninfo: The remote repository contained %d additional tags which were not imported: %s\n", len(r.AdditionalTags), strings.Join(r.AdditionalTags, ", "))
}
printer, err := o.ToPrinter(message)
if err != nil {
return err
}
return printer.PrintObj(stream, o.Out)
}
func wasError(isi *imagev1.ImageStreamImport) bool {
for _, image := range isi.Status.Images {
if image.Status.Status == metav1.StatusFailure {
return true
}
}
if isi.Status.Repository != nil && isi.Status.Repository.Status.Status == metav1.StatusFailure {
return true
}
return false
}
// TODO: move to image/api as a helper
type importError struct {
annotation string
}
func (e importError) Error() string {
return fmt.Sprintf("unable to import image: %s", e.annotation)
}
func (o *ImportImageOptions) createImageImport() (*imagev1.ImageStream, *imagev1.ImageStreamImport, error) {
var isi *imagev1.ImageStreamImport
stream, err := o.isClient.Get(o.Name, metav1.GetOptions{})
// no stream, try creating one
if err != nil {
if !errors.IsNotFound(err) {
return nil, nil, err
}
if !o.Confirm {
return nil, nil, fmt.Errorf("no image stream named %q exists, pass --confirm to create and import", o.Name)
}
stream, isi = o.newImageStream()
return stream, isi, nil
}
if o.All {
// importing the entire repository
isi, err = o.importAll(stream)
if err != nil {
return nil, nil, err
}
} else {
// importing a single tag
isi, err = o.importTag(stream)
if err != nil {
return nil, nil, err
}
}
// this is ok because we know exactly how we want to be serialized
if stream.GetObjectKind().GroupVersionKind().Empty() {
stream.GetObjectKind().SetGroupVersionKind(imagev1.SchemeGroupVersion.WithKind("ImageStream"))
}
return stream, isi, nil
}
func (o *ImportImageOptions) importAll(stream *imagev1.ImageStream) (*imagev1.ImageStreamImport, error) {
from := o.From
// update ImageStream appropriately
if len(from) == 0 {
if len(stream.Spec.DockerImageRepository) != 0 {
from = stream.Spec.DockerImageRepository
} else {
tags := make(map[string]string)
for _, tag := range stream.Spec.Tags {
if tag.From != nil && tag.From.Kind == "DockerImage" {
tags[tag.Name] = tag.From.Name
}
}
if len(tags) == 0 {
return nil, fmt.Errorf("image stream does not have tags pointing to external docker images")
}
return o.newImageStreamImportTags(stream, tags), nil
}
}
if from != stream.Spec.DockerImageRepository {
if !o.Confirm {
if len(stream.Spec.DockerImageRepository) == 0 {
return nil, fmt.Errorf("the image stream does not currently import an entire Docker repository, pass --confirm to update")
}
return nil, fmt.Errorf("the image stream has a different import spec %q, pass --confirm to update", stream.Spec.DockerImageRepository)
}
stream.Spec.DockerImageRepository = from
}
// and create accompanying ImageStreamImport
return o.newImageStreamImportAll(stream, from), nil
}
func (o *ImportImageOptions) importTag(stream *imagev1.ImageStream) (*imagev1.ImageStreamImport, error) {
from := o.From
tag := o.Tag
// follow any referential tags to the destination
finalTag, existing, multiple, err := followTagReferenceV1(stream, tag)
switch err {
case imageapi.ErrInvalidReference:
return nil, fmt.Errorf("tag %q points to an invalid imagestreamtag", tag)
case imageapi.ErrCrossImageStreamReference:
return nil, fmt.Errorf("tag %q points to an imagestreamtag from another ImageStream", tag)
case imageapi.ErrCircularReference:
return nil, fmt.Errorf("tag %q on the image stream is a reference to same tag", tag)
case imageapi.ErrNotFoundReference:
// create a new tag
if len(from) == 0 && tag == imageapi.DefaultImageTag {
from = stream.Spec.DockerImageRepository
}
// if the from is still empty this means there's no such tag defined
// nor we can't create any from .spec.dockerImageRepository
if len(from) == 0 {
return nil, fmt.Errorf("the tag %q does not exist on the image stream - choose an existing tag to import or use the 'tag' command to create a new tag", tag)
}
existing = &imagev1.TagReference{
From: &corev1.ObjectReference{
Kind: "DockerImage",
Name: from,
},
}
case nil:
// disallow re-importing anything other than DockerImage
if existing.From != nil && existing.From.Kind != "DockerImage" {
return nil, fmt.Errorf("tag %q points to existing %s %q, it cannot be re-imported", tag, existing.From.Kind, existing.From.Name)
}
// disallow changing an existing tag
if existing.From == nil {
return nil, fmt.Errorf("tag %q already exists - you must use the 'tag' command if you want to change the source to %q", tag, from)
}
if len(from) != 0 && from != existing.From.Name {
if multiple {
return nil, fmt.Errorf("the tag %q points to the tag %q which points to %q - use the 'tag' command if you want to change the source to %q",
tag, finalTag, existing.From.Name, from)
}
return nil, fmt.Errorf("the tag %q points to %q - use the 'tag' command if you want to change the source to %q", tag, existing.From.Name, from)
}
// set the target item to import
from = existing.From.Name
if multiple {
tag = finalTag
}
// clear the legacy annotation
delete(existing.Annotations, imageapi.DockerImageRepositoryCheckAnnotation)
// reset the generation
zero := int64(0)
existing.Generation = &zero
}
tagFound := false
for i := range stream.Spec.Tags {
if stream.Spec.Tags[i].Name == tag {
stream.Spec.Tags[i] = *existing
tagFound = true
break
}
}
if !tagFound {
stream.Spec.Tags = append(stream.Spec.Tags, *existing)
}
// and create accompanying ImageStreamImport
return o.newImageStreamImportTags(stream, map[string]string{tag: from}), nil
}
func (o *ImportImageOptions) newImageStream() (*imagev1.ImageStream, *imagev1.ImageStreamImport) {
from := o.From
tag := o.Tag
if len(from) == 0 {
from = o.Target
}
var (
stream *imagev1.ImageStream
isi *imagev1.ImageStreamImport
)
// create new ImageStream and accompanying ImageStreamImport
// TODO: this should be removed along with the legacy path, we don't need to
// create the IS in the new path, the import mechanism will do that for us,
// this is only for the legacy path that we need to create the IS.
if o.All {
stream = &imagev1.ImageStream{
// this is ok because we know exactly how we want to be serialized
TypeMeta: metav1.TypeMeta{APIVersion: imagev1.SchemeGroupVersion.String(), Kind: "ImageStream"},
ObjectMeta: metav1.ObjectMeta{Name: o.Name},
Spec: imagev1.ImageStreamSpec{DockerImageRepository: from},
}
isi = o.newImageStreamImportAll(stream, from)
} else {
stream = &imagev1.ImageStream{
// this is ok because we know exactly how we want to be serialized
TypeMeta: metav1.TypeMeta{APIVersion: imagev1.SchemeGroupVersion.String(), Kind: "ImageStream"},
ObjectMeta: metav1.ObjectMeta{Name: o.Name},
Spec: imagev1.ImageStreamSpec{
Tags: []imagev1.TagReference{
{
From: &corev1.ObjectReference{
Kind: "DockerImage",
Name: from,
},
ReferencePolicy: o.getReferencePolicy(),
},
},
},
}
isi = o.newImageStreamImportTags(stream, map[string]string{tag: from})
}
return stream, isi
}
func (o *ImportImageOptions) getReferencePolicy() imagev1.TagReferencePolicy {
ref := imagev1.TagReferencePolicy{}
if len(o.ReferencePolicy) == 0 {
return ref
}
switch o.ReferencePolicy {
case tag.SourceReferencePolicy:
ref.Type = imagev1.SourceTagReferencePolicy
case tag.LocalReferencePolicy:
ref.Type = imagev1.LocalTagReferencePolicy
}
return ref
}
func (o *ImportImageOptions) newImageStreamImport(stream *imagev1.ImageStream) (*imagev1.ImageStreamImport, bool) {
isi := &imagev1.ImageStreamImport{
ObjectMeta: metav1.ObjectMeta{
Name: stream.Name,
Namespace: o.Namespace,
ResourceVersion: stream.ResourceVersion,
},
Spec: imagev1.ImageStreamImportSpec{Import: !o.DryRun},
}
insecureAnnotation := stream.Annotations[imageapi.InsecureRepositoryAnnotation]
insecure := insecureAnnotation == "true"
// --insecure flag (if provided) takes precedence over insecure annotation
if o.InsecureFlagProvided {
insecure = o.Insecure
}
return isi, insecure
}
func (o *ImportImageOptions) newImageStreamImportAll(stream *imagev1.ImageStream, from string) *imagev1.ImageStreamImport {
isi, insecure := o.newImageStreamImport(stream)
isi.Spec.Repository = &imagev1.RepositoryImportSpec{
From: corev1.ObjectReference{
Kind: "DockerImage",
Name: from,
},
ImportPolicy: imagev1.TagImportPolicy{
Insecure: insecure,
Scheduled: o.Scheduled,
},
ReferencePolicy: o.getReferencePolicy(),
}
return isi
}
func (o *ImportImageOptions) newImageStreamImportTags(stream *imagev1.ImageStream, tags map[string]string) *imagev1.ImageStreamImport {
isi, streamInsecure := o.newImageStreamImport(stream)
for tag, from := range tags {
insecure := streamInsecure
scheduled := o.Scheduled
oldTagFound := false
var oldTag imagev1.TagReference
for _, t := range stream.Spec.Tags {
if t.Name == tag {
oldTag = t
oldTagFound = true
break
}
}
if oldTagFound {
insecure = insecure || oldTag.ImportPolicy.Insecure
scheduled = scheduled || oldTag.ImportPolicy.Scheduled
}
isi.Spec.Images = append(isi.Spec.Images, imagev1.ImageImportSpec{
From: corev1.ObjectReference{
Kind: "DockerImage",
Name: from,
},
To: &corev1.LocalObjectReference{Name: tag},
ImportPolicy: imagev1.TagImportPolicy{
Insecure: insecure,
Scheduled: scheduled,
},
ReferencePolicy: o.getReferencePolicy(),
})
}
return isi
}
// followTagReferenceV1 walks through the defined tags on a stream, following any referential tags in the stream.
// Will return multiple if the tag had at least reference, and ref and finalTag will be the last tag seen.
// If an invalid reference is found, err will be returned.
func followTagReferenceV1(stream *imagev1.ImageStream, tag string) (finalTag string, ref *imagev1.TagReference, multiple bool, err error) {
seen := sets.NewString()
for {
if seen.Has(tag) {
// circular reference
return tag, nil, multiple, imageapi.ErrCircularReference
}
seen.Insert(tag)
tagRefFound := false
var tagRef imagev1.TagReference
for _, t := range stream.Spec.Tags {
if t.Name == tag {
tagRef = t
tagRefFound = true
break
}
}
if !tagRefFound {
// no tag at the end of the rainbow
return tag, nil, multiple, imageapi.ErrNotFoundReference
}
if tagRef.From == nil || tagRef.From.Kind != "ImageStreamTag" {
// terminating tag
return tag, &tagRef, multiple, nil
}
if tagRef.From.Namespace != "" && tagRef.From.Namespace != stream.ObjectMeta.Namespace {
return tag, nil, multiple, imageapi.ErrCrossImageStreamReference
}
// The reference needs to be followed with two format patterns:
// a) sameis:sometag and b) sometag
if strings.Contains(tagRef.From.Name, ":") {
name, tagref, ok := imageapi.SplitImageStreamTag(tagRef.From.Name)
if !ok {
return tag, nil, multiple, imageapi.ErrInvalidReference
}
if name != stream.ObjectMeta.Name {
// anotheris:sometag - this should not happen.
return tag, nil, multiple, imageapi.ErrCrossImageStreamReference
}
// sameis:sometag - follow the reference as sometag
tag = tagref
} else {
// sometag - follow the reference
tag = tagRef.From.Name
}
multiple = true
}
}