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pull.go

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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(cli.configFile.AuthConfigs, 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)

}