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images.go
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images.go
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package prune
import (
"crypto/x509"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"strings"
"text/tabwriter"
"time"
"github.com/spf13/cobra"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/restclient"
kclient "k8s.io/kubernetes/pkg/client/unversioned"
kcmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
knet "k8s.io/kubernetes/pkg/util/net"
"github.com/openshift/origin/pkg/client"
"github.com/openshift/origin/pkg/cmd/server/bootstrappolicy"
"github.com/openshift/origin/pkg/cmd/util/clientcmd"
imageapi "github.com/openshift/origin/pkg/image/api"
"github.com/openshift/origin/pkg/image/prune"
oserrors "github.com/openshift/origin/pkg/util/errors"
)
const (
// PruneImagesRecommendedName is the recommended command name
PruneImagesRecommendedName = "images"
imagesLongDesc = `Prune images no longer needed due to age and/or status
By default, the prune operation performs a dry run making no changes to internal registry. A
--confirm flag is needed for changes to be effective.
Only a user with a cluster role %s or higher who is logged-in will be able to actually delete the
images.`
imagesExample = ` # See, what the prune command would delete if only images more than an hour old and obsoleted
# by 3 newer revisions under the same tag were considered.
%[1]s %[2]s --keep-tag-revisions=3 --keep-younger-than=60m
# To actually perform the prune operation, the confirm flag must be appended
%[1]s %[2]s --keep-tag-revisions=3 --keep-younger-than=60m --confirm
# See, what the prune command would delete if we're interested in removing images
# exceeding currently set LimitRanges ('openshift.io/Image')
%[1]s %[2]s --prune-over-size-limit
# To actually perform the prune operation, the confirm flag must be appended
%[1]s %[2]s --prune-over-size-limit --confirm`
)
var (
defaultKeepYoungerThan = 60 * time.Minute
defaultKeepTagRevisions = 3
defaultPruneImageOverSizeLimit = false
)
// PruneImagesOptions holds all the required options for pruning images.
type PruneImagesOptions struct {
Confirm bool
KeepYoungerThan *time.Duration
KeepTagRevisions *int
PruneOverSizeLimit *bool
CABundle string
RegistryUrlOverride string
Pruner prune.Pruner
Client client.Interface
Out io.Writer
}
// NewCmdPruneImages implements the OpenShift cli prune images command.
func NewCmdPruneImages(f *clientcmd.Factory, parentName, name string, out io.Writer) *cobra.Command {
opts := &PruneImagesOptions{
Confirm: false,
KeepYoungerThan: &defaultKeepYoungerThan,
KeepTagRevisions: &defaultKeepTagRevisions,
PruneOverSizeLimit: &defaultPruneImageOverSizeLimit,
}
cmd := &cobra.Command{
Use: name,
Short: "Remove unreferenced images",
Long: fmt.Sprintf(imagesLongDesc, bootstrappolicy.ImagePrunerRoleName),
Example: fmt.Sprintf(imagesExample, parentName, name),
Run: func(cmd *cobra.Command, args []string) {
kcmdutil.CheckErr(opts.Complete(f, cmd, args, out))
kcmdutil.CheckErr(opts.Validate())
kcmdutil.CheckErr(opts.Run())
},
}
cmd.Flags().BoolVar(&opts.Confirm, "confirm", opts.Confirm, "Specify that image pruning should proceed. Defaults to false, displaying what would be deleted but not actually deleting anything.")
cmd.Flags().DurationVar(opts.KeepYoungerThan, "keep-younger-than", *opts.KeepYoungerThan, "Specify the minimum age of an image for it to be considered a candidate for pruning.")
cmd.Flags().IntVar(opts.KeepTagRevisions, "keep-tag-revisions", *opts.KeepTagRevisions, "Specify the number of image revisions for a tag in an image stream that will be preserved.")
cmd.Flags().BoolVar(opts.PruneOverSizeLimit, "prune-over-size-limit", *opts.PruneOverSizeLimit, "Specify if images which are exceeding LimitRanges (see 'openshift.io/Image'), specified in the same namespace, should be considered for pruning. This flag cannot be combined with --keep-younger-than nor --keep-tag-revisions.")
cmd.Flags().StringVar(&opts.CABundle, "certificate-authority", opts.CABundle, "The path to a certificate authority bundle to use when communicating with the managed Docker registries. Defaults to the certificate authority data from the current user's config file.")
cmd.Flags().StringVar(&opts.RegistryUrlOverride, "registry-url", opts.RegistryUrlOverride, "The address to use when contacting the registry, instead of using the default value. This is useful if you can't resolve or reach the registry (e.g.; the default is a cluster-internal URL) but you do have an alternative route that works.")
return cmd
}
// Complete turns a partially defined PruneImagesOptions into a solvent structure
// which can be validated and used for pruning images.
func (o *PruneImagesOptions) Complete(f *clientcmd.Factory, cmd *cobra.Command, args []string, out io.Writer) error {
if len(args) > 0 {
return kcmdutil.UsageError(cmd, "no arguments are allowed to this command")
}
if !cmd.Flags().Lookup("keep-younger-than").Changed {
o.KeepYoungerThan = nil
}
if !cmd.Flags().Lookup("keep-tag-revisions").Changed {
o.KeepTagRevisions = nil
}
if !cmd.Flags().Lookup("prune-over-size-limit").Changed {
o.PruneOverSizeLimit = nil
}
o.Out = out
osClient, kClient, registryClient, err := getClients(f, o.CABundle)
if err != nil {
return err
}
o.Client = osClient
allImages, err := osClient.Images().List(kapi.ListOptions{})
if err != nil {
return err
}
allStreams, err := osClient.ImageStreams(kapi.NamespaceAll).List(kapi.ListOptions{})
if err != nil {
return err
}
allPods, err := kClient.Pods(kapi.NamespaceAll).List(kapi.ListOptions{})
if err != nil {
return err
}
allRCs, err := kClient.ReplicationControllers(kapi.NamespaceAll).List(kapi.ListOptions{})
if err != nil {
return err
}
allBCs, err := osClient.BuildConfigs(kapi.NamespaceAll).List(kapi.ListOptions{})
// We need to tolerate 'not found' errors for buildConfigs since they may be disabled in Atomic
err = oserrors.TolerateNotFoundError(err)
if err != nil {
return err
}
allBuilds, err := osClient.Builds(kapi.NamespaceAll).List(kapi.ListOptions{})
// We need to tolerate 'not found' errors for builds since they may be disabled in Atomic
err = oserrors.TolerateNotFoundError(err)
if err != nil {
return err
}
allDCs, err := osClient.DeploymentConfigs(kapi.NamespaceAll).List(kapi.ListOptions{})
if err != nil {
return err
}
limitRangesList, err := kClient.LimitRanges(kapi.NamespaceAll).List(kapi.ListOptions{})
if err != nil {
return err
}
limitRangesMap := make(map[string][]*kapi.LimitRange)
for i := range limitRangesList.Items {
limit := limitRangesList.Items[i]
limits, ok := limitRangesMap[limit.Namespace]
if !ok {
limits = []*kapi.LimitRange{}
}
limits = append(limits, &limit)
limitRangesMap[limit.Namespace] = limits
}
options := prune.PrunerOptions{
KeepYoungerThan: o.KeepYoungerThan,
KeepTagRevisions: o.KeepTagRevisions,
PruneOverSizeLimit: o.PruneOverSizeLimit,
Images: allImages,
Streams: allStreams,
Pods: allPods,
RCs: allRCs,
BCs: allBCs,
Builds: allBuilds,
DCs: allDCs,
LimitRanges: limitRangesMap,
DryRun: o.Confirm == false,
RegistryClient: registryClient,
RegistryURL: o.RegistryUrlOverride,
}
o.Pruner = prune.NewPruner(options)
return nil
}
// Validate ensures that a PruneImagesOptions is valid and can be used to execute pruning.
func (o PruneImagesOptions) Validate() error {
if o.PruneOverSizeLimit != nil && (o.KeepYoungerThan != nil || o.KeepTagRevisions != nil) {
return fmt.Errorf("--prune-over-size-limit cannot be specified with --keep-tag-revisions nor --keep-younger-than")
}
if o.KeepYoungerThan != nil && *o.KeepYoungerThan < 0 {
return fmt.Errorf("--keep-younger-than must be greater than or equal to 0")
}
if o.KeepTagRevisions != nil && *o.KeepTagRevisions < 0 {
return fmt.Errorf("--keep-tag-revisions must be greater than or equal to 0")
}
if _, err := url.Parse(o.RegistryUrlOverride); err != nil {
return fmt.Errorf("invalid --registry-url flag: %v", err)
}
return nil
}
// Run contains all the necessary functionality for the OpenShift cli prune images command.
func (o PruneImagesOptions) Run() error {
w := tabwriter.NewWriter(o.Out, 10, 4, 3, ' ', 0)
defer w.Flush()
imageDeleter := &describingImageDeleter{w: w}
imageStreamDeleter := &describingImageStreamDeleter{w: w}
layerDeleter := &describingLayerDeleter{w: w}
blobDeleter := &describingBlobDeleter{w: w}
manifestDeleter := &describingManifestDeleter{w: w}
if o.Confirm {
imageDeleter.delegate = prune.NewImageDeleter(o.Client.Images())
imageStreamDeleter.delegate = prune.NewImageStreamDeleter(o.Client)
layerDeleter.delegate = prune.NewLayerDeleter()
blobDeleter.delegate = prune.NewBlobDeleter()
manifestDeleter.delegate = prune.NewManifestDeleter()
} else {
fmt.Fprintln(os.Stderr, "Dry run enabled - no modifications will be made. Add --confirm to remove images")
}
return o.Pruner.Prune(imageDeleter, imageStreamDeleter, layerDeleter, blobDeleter, manifestDeleter)
}
// describingImageStreamDeleter prints information about each image stream update.
// If a delegate exists, its DeleteImageStream function is invoked prior to returning.
type describingImageStreamDeleter struct {
w io.Writer
delegate prune.ImageStreamDeleter
headerPrinted bool
}
var _ prune.ImageStreamDeleter = &describingImageStreamDeleter{}
func (p *describingImageStreamDeleter) DeleteImageStream(stream *imageapi.ImageStream, image *imageapi.Image, updatedTags []string) (*imageapi.ImageStream, error) {
if !p.headerPrinted {
p.headerPrinted = true
fmt.Fprintln(p.w, "Deleting references from image streams to images ...")
fmt.Fprintln(p.w, "STREAM\tIMAGE\tTAGS")
}
fmt.Fprintf(p.w, "%s/%s\t%s\t%s\n", stream.Namespace, stream.Name, image.Name, strings.Join(updatedTags, ", "))
if p.delegate == nil {
return stream, nil
}
updatedStream, err := p.delegate.DeleteImageStream(stream, image, updatedTags)
if err != nil {
fmt.Fprintf(os.Stderr, "error updating image stream %s/%s to remove references to image %s: %v\n", stream.Namespace, stream.Name, image.Name, err)
}
return updatedStream, err
}
// describingImageDeleter prints information about each image being deleted.
// If a delegate exists, its DeleteImage function is invoked prior to returning.
type describingImageDeleter struct {
w io.Writer
delegate prune.ImageDeleter
headerPrinted bool
}
var _ prune.ImageDeleter = &describingImageDeleter{}
func (p *describingImageDeleter) DeleteImage(image *imageapi.Image) error {
if !p.headerPrinted {
p.headerPrinted = true
fmt.Fprintln(p.w, "\nDeleting images from server ...")
fmt.Fprintln(p.w, "IMAGE")
}
fmt.Fprintf(p.w, "%s\n", image.Name)
if p.delegate == nil {
return nil
}
err := p.delegate.DeleteImage(image)
if err != nil {
fmt.Fprintf(os.Stderr, "error deleting image %s from server: %v\n", image.Name, err)
}
return err
}
// describingLayerDeleter prints information about each repo layer link being
// deleted. If a delegate exists, its DeleteLayer function is invoked prior to
// returning.
type describingLayerDeleter struct {
w io.Writer
delegate prune.LayerDeleter
headerPrinted bool
}
var _ prune.LayerDeleter = &describingLayerDeleter{}
func (p *describingLayerDeleter) DeleteLayer(registryClient *http.Client, registryURL, repo, layer string) error {
if !p.headerPrinted {
p.headerPrinted = true
fmt.Fprintln(p.w, "\nDeleting registry repository layer links ...")
fmt.Fprintln(p.w, "REPO\tLAYER")
}
fmt.Fprintf(p.w, "%s\t%s\n", repo, layer)
if p.delegate == nil {
return nil
}
err := p.delegate.DeleteLayer(registryClient, registryURL, repo, layer)
if err != nil {
fmt.Fprintf(os.Stderr, "error deleting repository %s layer link %s from the registry: %v\n", repo, layer, err)
}
return err
}
// describingBlobDeleter prints information about each blob being deleted. If a
// delegate exists, its DeleteBlob function is invoked prior to returning.
type describingBlobDeleter struct {
w io.Writer
delegate prune.BlobDeleter
headerPrinted bool
}
var _ prune.BlobDeleter = &describingBlobDeleter{}
func (p *describingBlobDeleter) DeleteBlob(registryClient *http.Client, registryURL, layer string) error {
if !p.headerPrinted {
p.headerPrinted = true
fmt.Fprintln(p.w, "\nDeleting registry layer blobs ...")
fmt.Fprintln(p.w, "BLOB")
}
fmt.Fprintf(p.w, "%s\n", layer)
if p.delegate == nil {
return nil
}
err := p.delegate.DeleteBlob(registryClient, registryURL, layer)
if err != nil {
fmt.Fprintf(os.Stderr, "error deleting blob %s from the registry: %v\n", layer, err)
}
return err
}
// describingManifestDeleter prints information about each repo manifest being
// deleted. If a delegate exists, its DeleteManifest function is invoked prior
// to returning.
type describingManifestDeleter struct {
w io.Writer
delegate prune.ManifestDeleter
headerPrinted bool
}
var _ prune.ManifestDeleter = &describingManifestDeleter{}
func (p *describingManifestDeleter) DeleteManifest(registryClient *http.Client, registryURL, repo, manifest string) error {
if !p.headerPrinted {
p.headerPrinted = true
fmt.Fprintln(p.w, "\nDeleting registry repository manifest data ...")
fmt.Fprintln(p.w, "REPO\tIMAGE")
}
fmt.Fprintf(p.w, "%s\t%s\n", repo, manifest)
if p.delegate == nil {
return nil
}
err := p.delegate.DeleteManifest(registryClient, registryURL, repo, manifest)
if err != nil {
fmt.Fprintf(os.Stderr, "error deleting data for repository %s image manifest %s from the registry: %v\n", repo, manifest, err)
}
return err
}
// getClients returns a Kube client, OpenShift client, and registry client.
func getClients(f *clientcmd.Factory, caBundle string) (*client.Client, *kclient.Client, *http.Client, error) {
clientConfig, err := f.OpenShiftClientConfig.ClientConfig()
if err != nil {
return nil, nil, nil, err
}
var (
token string
osClient *client.Client
kClient *kclient.Client
registryClient *http.Client
)
switch {
case len(clientConfig.BearerToken) > 0:
osClient, kClient, err = f.Clients()
if err != nil {
return nil, nil, nil, err
}
token = clientConfig.BearerToken
default:
err = errors.New("you must use a client config with a token")
return nil, nil, nil, err
}
// copy the config
registryClientConfig := *clientConfig
// zero out everything we don't want to use
registryClientConfig.BearerToken = ""
registryClientConfig.CertFile = ""
registryClientConfig.CertData = []byte{}
registryClientConfig.KeyFile = ""
registryClientConfig.KeyData = []byte{}
// we have to set a username to something for the Docker login
// but it's not actually used
registryClientConfig.Username = "unused"
// set the "password" to be the token
registryClientConfig.Password = token
tlsConfig, err := restclient.TLSConfigFor(®istryClientConfig)
if err != nil {
return nil, nil, nil, err
}
// if the user specified a CA on the command line, add it to the
// client config's CA roots
if len(caBundle) > 0 {
data, err := ioutil.ReadFile(caBundle)
if err != nil {
return nil, nil, nil, err
}
if tlsConfig.RootCAs == nil {
tlsConfig.RootCAs = x509.NewCertPool()
}
tlsConfig.RootCAs.AppendCertsFromPEM(data)
}
transport := knet.SetTransportDefaults(&http.Transport{
TLSClientConfig: tlsConfig,
})
wrappedTransport, err := restclient.HTTPWrappersForConfig(®istryClientConfig, transport)
if err != nil {
return nil, nil, nil, err
}
registryClient = &http.Client{
Transport: wrappedTransport,
}
return osClient, kClient, registryClient, nil
}