140 lines
3.2 KiB
Go
140 lines
3.2 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package content
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import (
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"strings"
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"time"
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"unicode"
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"github.com/containerd/containerd/cmd/ctr/commands"
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"github.com/containerd/containerd/content"
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"github.com/containerd/containerd/leases"
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"github.com/containerd/containerd/log"
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"github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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)
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const (
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layerPrefix = "containerd.io/gc.ref.content.l."
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contentPrefix = "containerd.io/gc.ref.content."
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)
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var pruneFlags = []cli.Flag{
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cli.BoolFlag{
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Name: "async",
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Usage: "Allow garbage collection to cleanup asynchronously",
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},
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cli.BoolFlag{
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Name: "dry",
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Usage: "Just show updates without applying (enables debug logging)",
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},
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}
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var pruneCommand = cli.Command{
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Name: "prune",
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Usage: "Prunes content from the content store",
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Subcommands: cli.Commands{
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pruneReferencesCommand,
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},
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}
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var pruneReferencesCommand = cli.Command{
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Name: "references",
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Usage: "Prunes preference labels from the content store (layers only by default)",
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Flags: pruneFlags,
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Action: func(clicontext *cli.Context) error {
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client, ctx, cancel, err := commands.NewClient(clicontext)
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if err != nil {
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return err
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}
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defer cancel()
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dryRun := clicontext.Bool("dry")
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if dryRun {
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log.G(ctx).Logger.SetLevel(logrus.DebugLevel)
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log.G(ctx).Debug("dry run, no changes will be applied")
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}
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var deleteOpts []leases.DeleteOpt
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if !clicontext.Bool("async") {
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deleteOpts = append(deleteOpts, leases.SynchronousDelete)
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}
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cs := client.ContentStore()
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if err := cs.Walk(ctx, func(info content.Info) error {
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var fields []string
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for k := range info.Labels {
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if isLayerLabel(k) {
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log.G(ctx).WithFields(logrus.Fields{
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"digest": info.Digest,
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"label": k,
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}).Debug("Removing label")
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if dryRun {
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continue
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}
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fields = append(fields, "labels."+k)
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delete(info.Labels, k)
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}
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}
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if len(fields) == 0 {
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return nil
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}
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_, err := cs.Update(ctx, info, fields...)
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return err
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}); err != nil {
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return err
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}
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ls := client.LeasesService()
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l, err := ls.Create(ctx, leases.WithRandomID(), leases.WithExpiration(time.Hour))
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if err != nil {
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return err
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}
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return ls.Delete(ctx, l, deleteOpts...)
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},
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}
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func isLayerLabel(key string) bool {
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if strings.HasPrefix(key, layerPrefix) {
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return true
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}
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if !strings.HasPrefix(key, contentPrefix) {
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return false
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}
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// handle legacy labels which used content prefix and index (0 always for config)
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key = key[len(contentPrefix):]
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if isInteger(key) && key != "0" {
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return true
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}
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return false
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}
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func isInteger(key string) bool {
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for _, r := range key {
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if !unicode.IsDigit(r) {
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return false
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}
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}
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return true
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}
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