github.com/hustcat/docker@v1.3.3-0.20160314103604-901c67a8eeab/api/client/pull.go (about)

     1  package client
     2  
     3  import (
     4  	"errors"
     5  	"fmt"
     6  
     7  	"golang.org/x/net/context"
     8  
     9  	Cli "github.com/docker/docker/cli"
    10  	"github.com/docker/docker/pkg/jsonmessage"
    11  	flag "github.com/docker/docker/pkg/mflag"
    12  	"github.com/docker/docker/reference"
    13  	"github.com/docker/docker/registry"
    14  	"github.com/docker/engine-api/client"
    15  	"github.com/docker/engine-api/types"
    16  )
    17  
    18  // CmdPull pulls an image or a repository from the registry.
    19  //
    20  // Usage: docker pull [OPTIONS] IMAGENAME[:TAG|@DIGEST]
    21  func (cli *DockerCli) CmdPull(args ...string) error {
    22  	cmd := Cli.Subcmd("pull", []string{"NAME[:TAG|@DIGEST]"}, Cli.DockerCommands["pull"].Description, true)
    23  	allTags := cmd.Bool([]string{"a", "-all-tags"}, false, "Download all tagged images in the repository")
    24  	addTrustedFlags(cmd, true)
    25  	cmd.Require(flag.Exact, 1)
    26  
    27  	cmd.ParseFlags(args, true)
    28  	remote := cmd.Arg(0)
    29  
    30  	distributionRef, err := reference.ParseNamed(remote)
    31  	if err != nil {
    32  		return err
    33  	}
    34  	if *allTags && !reference.IsNameOnly(distributionRef) {
    35  		return errors.New("tag can't be used with --all-tags/-a")
    36  	}
    37  
    38  	if !*allTags && reference.IsNameOnly(distributionRef) {
    39  		distributionRef = reference.WithDefaultTag(distributionRef)
    40  		fmt.Fprintf(cli.out, "Using default tag: %s\n", reference.DefaultTag)
    41  	}
    42  
    43  	var tag string
    44  	switch x := distributionRef.(type) {
    45  	case reference.Canonical:
    46  		tag = x.Digest().String()
    47  	case reference.NamedTagged:
    48  		tag = x.Tag()
    49  	}
    50  
    51  	ref := registry.ParseReference(tag)
    52  
    53  	// Resolve the Repository name from fqn to RepositoryInfo
    54  	repoInfo, err := registry.ParseRepositoryInfo(distributionRef)
    55  	if err != nil {
    56  		return err
    57  	}
    58  
    59  	authConfig := cli.resolveAuthConfig(repoInfo.Index)
    60  	requestPrivilege := cli.registryAuthenticationPrivilegedFunc(repoInfo.Index, "pull")
    61  
    62  	if isTrusted() && !ref.HasDigest() {
    63  		// Check if tag is digest
    64  		return cli.trustedPull(repoInfo, ref, authConfig, requestPrivilege)
    65  	}
    66  
    67  	return cli.imagePullPrivileged(authConfig, distributionRef.String(), "", requestPrivilege)
    68  }
    69  
    70  func (cli *DockerCli) imagePullPrivileged(authConfig types.AuthConfig, imageID, tag string, requestPrivilege client.RequestPrivilegeFunc) error {
    71  
    72  	encodedAuth, err := encodeAuthToBase64(authConfig)
    73  	if err != nil {
    74  		return err
    75  	}
    76  	options := types.ImagePullOptions{
    77  		ImageID:      imageID,
    78  		Tag:          tag,
    79  		RegistryAuth: encodedAuth,
    80  	}
    81  
    82  	responseBody, err := cli.client.ImagePull(context.Background(), options, requestPrivilege)
    83  	if err != nil {
    84  		return err
    85  	}
    86  	defer responseBody.Close()
    87  
    88  	return jsonmessage.DisplayJSONMessagesStream(responseBody, cli.out, cli.outFd, cli.isTerminalOut, nil)
    89  }