package client import ( "errors" "fmt" "golang.org/x/net/context" Cli "github.com/docker/docker/cli" "github.com/docker/docker/pkg/jsonmessage" flag "github.com/docker/docker/pkg/mflag" "github.com/docker/docker/reference" "github.com/docker/docker/registry" "github.com/docker/engine-api/client" "github.com/docker/engine-api/types" ) // CmdPull pulls an image or a repository from the registry. // // Usage: docker pull [OPTIONS] IMAGENAME[:TAG|@DIGEST] func (cli *DockerCli) CmdPull(args ...string) error { cmd := Cli.Subcmd("pull", []string{"NAME[:TAG|@DIGEST]"}, Cli.DockerCommands["pull"].Description, true) allTags := cmd.Bool([]string{"a", "-all-tags"}, false, "Download all tagged images in the repository") addTrustedFlags(cmd, true) cmd.Require(flag.Exact, 1) cmd.ParseFlags(args, true) remote := cmd.Arg(0) distributionRef, err := reference.ParseNamed(remote) if err != nil { return err } if *allTags && !reference.IsNameOnly(distributionRef) { return errors.New("tag can't be used with --all-tags/-a") } if !*allTags && reference.IsNameOnly(distributionRef) { distributionRef = reference.WithDefaultTag(distributionRef) fmt.Fprintf(cli.out, "Using default tag: %s\n", reference.DefaultTag) } var tag string switch x := distributionRef.(type) { case reference.Canonical: tag = x.Digest().String() case reference.NamedTagged: tag = x.Tag() } ref := registry.ParseReference(tag) // Resolve the Repository name from fqn to RepositoryInfo repoInfo, err := registry.ParseRepositoryInfo(distributionRef) if err != nil { return err } authConfig := cli.resolveAuthConfig(repoInfo.Index) requestPrivilege := cli.registryAuthenticationPrivilegedFunc(repoInfo.Index, "pull") if isTrusted() && !ref.HasDigest() { // Check if tag is digest return cli.trustedPull(repoInfo, ref, authConfig, requestPrivilege) } return cli.imagePullPrivileged(authConfig, distributionRef.String(), "", requestPrivilege) } func (cli *DockerCli) imagePullPrivileged(authConfig types.AuthConfig, imageID, tag string, requestPrivilege client.RequestPrivilegeFunc) error { encodedAuth, err := encodeAuthToBase64(authConfig) if err != nil { return err } options := types.ImagePullOptions{ ImageID: imageID, Tag: tag, RegistryAuth: encodedAuth, } responseBody, err := cli.client.ImagePull(context.Background(), options, requestPrivilege) if err != nil { return err } defer responseBody.Close() return jsonmessage.DisplayJSONMessagesStream(responseBody, cli.out, cli.outFd, cli.isTerminalOut, nil) }