Import docker/docker/cli

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

cli/command/image/pull.go

@@ -0,0 +1,85 @@
+package image
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/docker/distribution/reference"
+	"github.com/docker/docker/cli"
+	"github.com/docker/docker/cli/command"
+	"github.com/docker/docker/registry"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	"golang.org/x/net/context"
+)
+
+type pullOptions struct {
+	remote string
+	all    bool
+}
+
+// NewPullCommand creates a new `docker pull` command
+func NewPullCommand(dockerCli *command.DockerCli) *cobra.Command {
+	var opts pullOptions
+
+	cmd := &cobra.Command{
+		Use:   "pull [OPTIONS] NAME[:TAG|@DIGEST]",
+		Short: "Pull an image or a repository from a registry",
+		Args:  cli.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			opts.remote = args[0]
+			return runPull(dockerCli, opts)
+		},
+	}
+
+	flags := cmd.Flags()
+
+	flags.BoolVarP(&opts.all, "all-tags", "a", false, "Download all tagged images in the repository")
+	command.AddTrustVerificationFlags(flags)
+
+	return cmd
+}
+
+func runPull(dockerCli *command.DockerCli, opts pullOptions) error {
+	distributionRef, err := reference.ParseNormalizedNamed(opts.remote)
+	if err != nil {
+		return err
+	}
+	if opts.all && !reference.IsNameOnly(distributionRef) {
+		return errors.New("tag can't be used with --all-tags/-a")
+	}
+
+	if !opts.all && reference.IsNameOnly(distributionRef) {
+		distributionRef = reference.TagNameOnly(distributionRef)
+		if tagged, ok := distributionRef.(reference.Tagged); ok {
+			fmt.Fprintf(dockerCli.Out(), "Using default tag: %s\n", tagged.Tag())
+		}
+	}
+
+	// Resolve the Repository name from fqn to RepositoryInfo
+	repoInfo, err := registry.ParseRepositoryInfo(distributionRef)
+	if err != nil {
+		return err
+	}
+
+	ctx := context.Background()
+
+	authConfig := command.ResolveAuthConfig(ctx, dockerCli, repoInfo.Index)
+	requestPrivilege := command.RegistryAuthenticationPrivilegedFunc(dockerCli, repoInfo.Index, "pull")
+
+	// Check if reference has a digest
+	_, isCanonical := distributionRef.(reference.Canonical)
+	if command.IsTrusted() && !isCanonical {
+		err = trustedPull(ctx, dockerCli, repoInfo, distributionRef, authConfig, requestPrivilege)
+	} else {
+		err = imagePullPrivileged(ctx, dockerCli, authConfig, reference.FamiliarString(distributionRef), requestPrivilege, opts.all)
+	}
+	if err != nil {
+		if strings.Contains(err.Error(), "when fetching 'plugin'") {
+			return errors.New(err.Error() + " - Use `docker plugin install`")
+		}
+		return err
+	}
+
+	return nil
+}