119 lines
3.9 KiB
Go
119 lines
3.9 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 images
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import (
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"fmt"
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"os"
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"sort"
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"strings"
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"text/tabwriter"
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"github.com/containerd/containerd/cmd/ctr/commands"
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"github.com/containerd/containerd/pkg/encryption"
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"github.com/containerd/containerd/platforms"
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"github.com/pkg/errors"
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"github.com/urfave/cli"
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)
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var layerinfoCommand = cli.Command{
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Name: "layerinfo",
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Usage: "get information about an image's layers",
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ArgsUsage: "[flags] <local>",
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Description: `Get encryption information about the layers of an image.
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Get information about the layers of an image and display with which
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encryption technology the individual layers are encrypted with.
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The user has control over the individual layers and the platforms they are
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associated with and can retrieve information for them separately. If no
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layers or platforms are specified, infomration for all layers and all
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platforms will be retrieved.
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`,
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Flags: append(commands.RegistryFlags, cli.IntSliceFlag{
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Name: "layer",
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Usage: "The layer to get info for; this must be either the layer number or a negative number starting with -1 for topmost layer",
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}, cli.StringSliceFlag{
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Name: "platform",
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Usage: "For which platform to get the layer info; by default info for all platforms is retrieved",
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}, cli.StringFlag{
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Name: "gpg-homedir",
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Usage: "The GPG homedir to use; by default gpg uses ~/.gnupg",
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}, cli.StringFlag{
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Name: "gpg-version",
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Usage: "The GPG version (\"v1\" or \"v2\"), default will make an educated guess",
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}, cli.BoolFlag{
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Name: "n",
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Usage: "Do not resolve PGP key IDs to email addresses",
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}),
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Action: func(context *cli.Context) error {
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local := context.Args().First()
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if local == "" {
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return errors.New("please provide the name of an image to decrypt")
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}
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client, ctx, cancel, err := commands.NewClient(context)
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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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layers32 := commands.IntToInt32Array(context.IntSlice("layer"))
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LayerInfos, _, err := getImageLayerInfos(client, ctx, local, layers32, context.StringSlice("platform"))
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if err != nil {
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return err
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}
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if len(LayerInfos) == 0 {
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return nil
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}
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var gpgClient encryption.GPGClient
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if !context.Bool("n") {
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// create a GPG client to resolve keyIds to names
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gpgClient, _ = createGPGClient(context)
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}
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w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', tabwriter.AlignRight)
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fmt.Fprintf(w, "#\tDIGEST\tPLATFORM\tSIZE\tENCRYPTION\tRECIPIENTS\t\n")
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for _, layer := range LayerInfos {
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var recipients []string
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var schemes []string
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for scheme, wrappedKeys := range encryption.GetWrappedKeysMap(layer.Descriptor) {
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schemes = append(schemes, scheme)
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keywrapper := encryption.GetKeyWrapper(scheme)
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if keywrapper != nil {
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addRecipients, err := keywrapper.GetRecipients(wrappedKeys)
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if err != nil {
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return err
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}
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if scheme == "pgp" && gpgClient != nil {
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addRecipients = gpgClient.ResolveRecipients(addRecipients)
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}
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recipients = append(recipients, addRecipients...)
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} else {
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recipients = append(recipients, fmt.Sprintf("No %s KeyWrapper", scheme))
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}
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}
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sort.Strings(schemes)
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sort.Strings(recipients)
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fmt.Fprintf(w, "%d\t%s\t%s\t%d\t%s\t%s\t\n", layer.Index, layer.Descriptor.Digest.String(), platforms.Format(*layer.Descriptor.Platform), layer.Descriptor.Size, strings.Join(schemes, ","), strings.Join(recipients, ", "))
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}
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w.Flush()
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return nil
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},
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}
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