DockerCLI/cli/command/container/create.go

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package container
import (
"fmt"
"io"
"os"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/command/image"
"github.com/docker/distribution/reference"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
apiclient "github.com/docker/docker/client"
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/registry"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"golang.org/x/net/context"
)
type createOptions struct {
name string
platform string
untrusted bool
}
// NewCreateCommand creates a new cobra.Command for `docker create`
func NewCreateCommand(dockerCli command.Cli) *cobra.Command {
var opts createOptions
var copts *containerOptions
cmd := &cobra.Command{
Use: "create [OPTIONS] IMAGE [COMMAND] [ARG...]",
Short: "Create a new container",
Args: cli.RequiresMinArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
copts.Image = args[0]
if len(args) > 1 {
copts.Args = args[1:]
}
return runCreate(dockerCli, cmd.Flags(), &opts, copts)
},
}
flags := cmd.Flags()
flags.SetInterspersed(false)
flags.StringVar(&opts.name, "name", "", "Assign a name to the container")
// Add an explicit help that doesn't have a `-h` to prevent the conflict
// with hostname
flags.Bool("help", false, "Print usage")
command.AddPlatformFlag(flags, &opts.platform)
command.AddTrustVerificationFlags(flags, &opts.untrusted, dockerCli.ContentTrustEnabled())
copts = addFlags(flags)
return cmd
}
func runCreate(dockerCli command.Cli, flags *pflag.FlagSet, opts *createOptions, copts *containerOptions) error {
containerConfig, err := parse(flags, copts)
if err != nil {
reportError(dockerCli.Err(), "create", err.Error(), true)
return cli.StatusError{StatusCode: 125}
}
response, err := createContainer(context.Background(), dockerCli, containerConfig, opts)
if err != nil {
return err
}
fmt.Fprintln(dockerCli.Out(), response.ID)
return nil
}
func pullImage(ctx context.Context, dockerCli command.Cli, image string, platform string, out io.Writer) error {
ref, err := reference.ParseNormalizedNamed(image)
if err != nil {
return err
}
// Resolve the Repository name from fqn to RepositoryInfo
repoInfo, err := registry.ParseRepositoryInfo(ref)
if err != nil {
return err
}
authConfig := command.ResolveAuthConfig(ctx, dockerCli, repoInfo.Index)
encodedAuth, err := command.EncodeAuthToBase64(authConfig)
if err != nil {
return err
}
options := types.ImageCreateOptions{
RegistryAuth: encodedAuth,
Platform: platform,
}
responseBody, err := dockerCli.Client().ImageCreate(ctx, image, options)
if err != nil {
return err
}
defer responseBody.Close()
return jsonmessage.DisplayJSONMessagesStream(
responseBody,
out,
dockerCli.Out().FD(),
dockerCli.Out().IsTerminal(),
nil)
}
type cidFile struct {
path string
file *os.File
written bool
}
func (cid *cidFile) Close() error {
if cid.file == nil {
return nil
}
cid.file.Close()
if cid.written {
return nil
}
if err := os.Remove(cid.path); err != nil {
return errors.Errorf("failed to remove the CID file '%s': %s \n", cid.path, err)
}
return nil
}
func (cid *cidFile) Write(id string) error {
if cid.file == nil {
return nil
}
if _, err := cid.file.Write([]byte(id)); err != nil {
return errors.Errorf("Failed to write the container ID to the file: %s", err)
}
cid.written = true
return nil
}
func newCIDFile(path string) (*cidFile, error) {
if path == "" {
return &cidFile{}, nil
}
if _, err := os.Stat(path); err == nil {
return nil, errors.Errorf("Container ID file found, make sure the other container isn't running or delete %s", path)
}
f, err := os.Create(path)
if err != nil {
return nil, errors.Errorf("Failed to create the container ID file: %s", err)
}
return &cidFile{path: path, file: f}, nil
}
func createContainer(ctx context.Context, dockerCli command.Cli, containerConfig *containerConfig, opts *createOptions) (*container.ContainerCreateCreatedBody, error) {
config := containerConfig.Config
hostConfig := containerConfig.HostConfig
networkingConfig := containerConfig.NetworkingConfig
stderr := dockerCli.Err()
var (
trustedRef reference.Canonical
namedRef reference.Named
)
containerIDFile, err := newCIDFile(hostConfig.ContainerIDFile)
if err != nil {
return nil, err
}
defer containerIDFile.Close()
ref, err := reference.ParseAnyReference(config.Image)
if err != nil {
return nil, err
}
if named, ok := ref.(reference.Named); ok {
namedRef = reference.TagNameOnly(named)
if taggedRef, ok := namedRef.(reference.NamedTagged); ok && !opts.untrusted {
var err error
trustedRef, err = image.TrustedReference(ctx, dockerCli, taggedRef, nil)
if err != nil {
return nil, err
}
config.Image = reference.FamiliarString(trustedRef)
}
}
//create the container
response, err := dockerCli.Client().ContainerCreate(ctx, config, hostConfig, networkingConfig, opts.name)
//if image not found try to pull it
if err != nil {
if apiclient.IsErrNotFound(err) && namedRef != nil {
fmt.Fprintf(stderr, "Unable to find image '%s' locally\n", reference.FamiliarString(namedRef))
// we don't want to write to stdout anything apart from container.ID
if err := pullImage(ctx, dockerCli, config.Image, opts.platform, stderr); err != nil {
return nil, err
}
if taggedRef, ok := namedRef.(reference.NamedTagged); ok && trustedRef != nil {
if err := image.TagTrusted(ctx, dockerCli, trustedRef, taggedRef); err != nil {
return nil, err
}
}
// Retry
var retryErr error
response, retryErr = dockerCli.Client().ContainerCreate(ctx, config, hostConfig, networkingConfig, opts.name)
if retryErr != nil {
return nil, retryErr
}
} else {
return nil, err
}
}
for _, warning := range response.Warnings {
fmt.Fprintf(stderr, "WARNING: %s\n", warning)
}
err = containerIDFile.Write(response.ID)
return &response, err
}