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package image
import (
"context"
"fmt"
"strings"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/trust"
"github.com/docker/distribution/reference"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
// PullOptions defines what and how to pull
type PullOptions struct {
remote string
all bool
platform string
untrusted bool
}
// NewPullCommand creates a new `docker pull` command
func NewPullCommand(dockerCli command.Cli) *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.AddPlatformFlag(flags, &opts.platform)
command.AddTrustVerificationFlags(flags, &opts.untrusted, dockerCli.ContentTrustEnabled())
return cmd
}
// RunPull performs a pull against the engine based on the specified options
func RunPull(cli command.Cli, opts PullOptions) error {
distributionRef, err := reference.ParseNormalizedNamed(opts.remote)
switch {
case err != nil:
return err
case opts.all && !reference.IsNameOnly(distributionRef):
return errors.New("tag can't be used with --all-tags/-a")
case !opts.all && reference.IsNameOnly(distributionRef):
distributionRef = reference.TagNameOnly(distributionRef)
if tagged, ok := distributionRef.(reference.Tagged); ok {
fmt.Fprintf(cli.Out(), "Using default tag: %s\n", tagged.Tag())
}
}
ctx := context.Background()
imgRefAndAuth, err := trust.GetImageReferencesAndAuth(ctx, nil, AuthResolver(cli), distributionRef.String())
if err != nil {
return err
}
// Check if reference has a digest
_, isCanonical := distributionRef.(reference.Canonical)
if !opts.untrusted && !isCanonical {
err = trustedPull(ctx, cli, imgRefAndAuth, opts.platform)
} else {
err = imagePullPrivileged(ctx, cli, imgRefAndAuth, opts.all, opts.platform)
}
if err != nil {
if strings.Contains(err.Error(), "when fetching 'plugin'") {
return errors.New(err.Error() + " - Use `docker plugin install`")
}
return err
}
return nil
}