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package main
import (
"fmt"
"io"
"os"
"strings"
"github.com/containers/image/docker"
dockerarchive "github.com/containers/image/docker/archive"
"github.com/containers/image/transports/alltransports"
"github.com/containers/image/types"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/libpod/image"
"github.com/containers/libpod/pkg/adapter"
"github.com/containers/libpod/pkg/util"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
var (
pullCommand cliconfig.PullValues
pullDescription = `Pulls an image from a registry and stores it locally.
An image can be pulled using its tag or digest. If a tag is not specified, the image with the 'latest' tag (if it exists) is pulled.`
_pullCommand = &cobra.Command{
Use: "pull [flags] IMAGE-PATH",
Short: "Pull an image from a registry",
Long: pullDescription,
RunE: func(cmd *cobra.Command, args []string) error {
pullCommand.InputArgs = args
pullCommand.GlobalFlags = MainGlobalOpts
pullCommand.Remote = remoteclient
return pullCmd(&pullCommand)
},
Example: `podman pull imageName
podman pull --cert-dir image/certs --authfile temp-auths/myauths.json docker://docker.io/myrepo/finaltest
podman pull fedora:latest`,
}
)
func init() {
pullCommand.Command = _pullCommand
pullCommand.SetHelpTemplate(HelpTemplate())
pullCommand.SetUsageTemplate(UsageTemplate())
flags := pullCommand.Flags()
flags.BoolVar(&pullCommand.AllTags, "all-tags", false, "All tagged images in the repository will be pulled")
flags.StringVar(&pullCommand.CertDir, "cert-dir", "", "`Pathname` of a directory containing TLS certificates and keys")
flags.StringVar(&pullCommand.Creds, "creds", "", "`Credentials` (USERNAME:PASSWORD) to use for authenticating to a registry")
flags.BoolVarP(&pullCommand.Quiet, "quiet", "q", false, "Suppress output information when pulling images")
// Disabled flags for the remote client
if !remote {
flags.StringVar(&pullCommand.Authfile, "authfile", "", "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override")
flags.StringVar(&pullCommand.SignaturePolicy, "signature-policy", "", "`Pathname` of signature policy file (not usually used)")
flags.BoolVar(&pullCommand.TlsVerify, "tls-verify", true, "Require HTTPS and verify certificates when contacting registries")
}
}
// pullCmd gets the data from the command line and calls pullImage
// to copy an image from a registry to a local machine
func pullCmd(c *cliconfig.PullValues) (retError error) {
defer func() {
if retError != nil && exitCode == 0 {
exitCode = 1
}
}()
if c.Bool("trace") {
span, _ := opentracing.StartSpanFromContext(Ctx, "pullCmd")
defer span.Finish()
}
runtime, err := adapter.GetRuntime(getContext(), &c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
args := c.InputArgs
if len(args) == 0 {
return errors.Errorf("an image name must be specified")
}
if len(args) > 1 {
return errors.Errorf("too many arguments. Requires exactly 1")
}
arr := strings.SplitN(args[0], ":", 2)
if len(arr) == 2 {
if c.Bool("all-tags") {
return errors.Errorf("tag can't be used with --all-tags")
}
}
ctx := getContext()
imgArg := args[0]
var registryCreds *types.DockerAuthConfig
if c.Flag("creds").Changed {
creds, err := util.ParseRegistryCreds(c.Creds)
if err != nil {
return err
}
registryCreds = creds
}
var (
writer io.Writer
)
if !c.Quiet {
writer = os.Stderr
}
dockerRegistryOptions := image.DockerRegistryOptions{
DockerRegistryCreds: registryCreds,
DockerCertPath: c.CertDir,
}
if c.IsSet("tls-verify") {
dockerRegistryOptions.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!c.TlsVerify)
}
// Special-case for docker-archive which allows multiple tags.
if strings.HasPrefix(imgArg, dockerarchive.Transport.Name()+":") {
srcRef, err := alltransports.ParseImageName(imgArg)
if err != nil {
return errors.Wrapf(err, "error parsing %q", imgArg)
}
newImage, err := runtime.LoadFromArchiveReference(getContext(), srcRef, c.SignaturePolicy, writer)
if err != nil {
return errors.Wrapf(err, "error pulling image from %q", imgArg)
}
fmt.Println(newImage[0].ID())
return nil
}
authfile := getAuthFile(c.String("authfile"))
// FIXME: the default pull consults the registries.conf's search registries
// while the all-tags pull does not. This behavior must be fixed in the
// future and span across c/buildah, c/image and c/libpod to avoid redundant
// and error prone code.
//
// See https://bugzilla.redhat.com/show_bug.cgi?id=1701922 for background
// information.
if !c.Bool("all-tags") {
newImage, err := runtime.New(getContext(), imgArg, c.SignaturePolicy, authfile, writer, &dockerRegistryOptions, image.SigningOptions{}, true, nil)
if err != nil {
return errors.Wrapf(err, "error pulling image %q", imgArg)
}
fmt.Println(newImage.ID())
return nil
}
// FIXME: all-tags should use the libpod backend instead of baking its own bread.
spec := imgArg
systemContext := image.GetSystemContext("", authfile, false)
srcRef, err := alltransports.ParseImageName(spec)
if err != nil {
dockerTransport := "docker://"
logrus.Debugf("error parsing image name %q, trying with transport %q: %v", spec, dockerTransport, err)
spec = dockerTransport + spec
srcRef2, err2 := alltransports.ParseImageName(spec)
if err2 != nil {
return errors.Wrapf(err2, "error parsing image name %q", imgArg)
}
srcRef = srcRef2
}
var names []string
if srcRef.DockerReference() == nil {
return errors.New("Non-docker transport is currently not supported")
}
tags, err := docker.GetRepositoryTags(ctx, systemContext, srcRef)
if err != nil {
return errors.Wrapf(err, "error getting repository tags")
}
for _, tag := range tags {
name := spec + ":" + tag
names = append(names, name)
}
var foundIDs []string
foundImage := true
for _, name := range names {
newImage, err := runtime.New(getContext(), name, c.String("signature-policy"), authfile, writer, &dockerRegistryOptions, image.SigningOptions{}, true, nil)
if err != nil {
logrus.Errorf("error pulling image %q", name)
foundImage = false
continue
}
foundIDs = append(foundIDs, newImage.ID())
}
if len(names) == 1 && !foundImage {
return errors.Wrapf(err, "error pulling image %q", imgArg)
}
if len(names) > 1 {
fmt.Println("Pulled Images:")
}
for _, id := range foundIDs {
fmt.Println(id)
}
return nil
}
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