DockerCLI/cli/command/manifest/inspect.go

148 lines
3.8 KiB
Go

package manifest
import (
"bytes"
"encoding/json"
"fmt"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/manifest/types"
"github.com/docker/distribution/manifest/manifestlist"
"github.com/docker/distribution/reference"
"github.com/docker/docker/registry"
"github.com/spf13/cobra"
"golang.org/x/net/context"
)
type inspectOptions struct {
ref string
list string
verbose bool
insecure bool
}
// NewInspectCommand creates a new `docker manifest inspect` command
func newInspectCommand(dockerCli command.Cli) *cobra.Command {
var opts inspectOptions
cmd := &cobra.Command{
Use: "inspect [OPTIONS] [MANIFEST_LIST] MANIFEST",
Short: "Display an image manifest, or manifest list",
Args: cli.RequiresRangeArgs(1, 2),
RunE: func(cmd *cobra.Command, args []string) error {
switch len(args) {
case 1:
opts.ref = args[0]
case 2:
opts.list = args[0]
opts.ref = args[1]
}
return runInspect(dockerCli, opts)
},
}
flags := cmd.Flags()
flags.BoolVar(&opts.insecure, "insecure", false, "Allow communication with an insecure registry")
flags.BoolVarP(&opts.verbose, "verbose", "v", false, "Output additional info including layers and platform")
return cmd
}
func runInspect(dockerCli command.Cli, opts inspectOptions) error {
namedRef, err := normalizeReference(opts.ref)
if err != nil {
return err
}
// If list reference is provided, display the local manifest in a list
if opts.list != "" {
listRef, err := normalizeReference(opts.list)
if err != nil {
return err
}
imageManifest, err := dockerCli.ManifestStore().Get(listRef, namedRef)
if err != nil {
return err
}
return printManifest(dockerCli, imageManifest, opts)
}
// Try a local manifest list first
localManifestList, err := dockerCli.ManifestStore().GetList(namedRef)
if err == nil {
return printManifestList(dockerCli, namedRef, localManifestList, opts)
}
// Next try a remote manifest
ctx := context.Background()
registryClient := dockerCli.RegistryClient(opts.insecure)
imageManifest, err := registryClient.GetManifest(ctx, namedRef)
if err == nil {
return printManifest(dockerCli, imageManifest, opts)
}
// Finally try a remote manifest list
manifestList, err := registryClient.GetManifestList(ctx, namedRef)
if err != nil {
return err
}
return printManifestList(dockerCli, namedRef, manifestList, opts)
}
func printManifest(dockerCli command.Cli, manifest types.ImageManifest, opts inspectOptions) error {
buffer := new(bytes.Buffer)
if !opts.verbose {
_, raw, err := manifest.Payload()
if err != nil {
return err
}
if err := json.Indent(buffer, raw, "", "\t"); err != nil {
return err
}
fmt.Fprintln(dockerCli.Out(), buffer.String())
return nil
}
jsonBytes, err := json.MarshalIndent(manifest, "", "\t")
if err != nil {
return err
}
dockerCli.Out().Write(append(jsonBytes, '\n'))
return nil
}
func printManifestList(dockerCli command.Cli, namedRef reference.Named, list []types.ImageManifest, opts inspectOptions) error {
if !opts.verbose {
targetRepo, err := registry.ParseRepositoryInfo(namedRef)
if err != nil {
return err
}
manifests := []manifestlist.ManifestDescriptor{}
// More than one response. This is a manifest list.
for _, img := range list {
mfd, err := buildManifestDescriptor(targetRepo, img)
if err != nil {
return fmt.Errorf("error assembling ManifestDescriptor")
}
manifests = append(manifests, mfd)
}
deserializedML, err := manifestlist.FromDescriptors(manifests)
if err != nil {
return err
}
jsonBytes, err := deserializedML.MarshalJSON()
if err != nil {
return err
}
fmt.Fprintln(dockerCli.Out(), string(jsonBytes))
return nil
}
jsonBytes, err := json.MarshalIndent(list, "", "\t")
if err != nil {
return err
}
dockerCli.Out().Write(append(jsonBytes, '\n'))
return nil
}