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package main
import (
"fmt"
"io"
"os"
"strings"
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/adapter"
image2 "github.com/containers/libpod/libpod/image"
"github.com/containers/libpod/pkg/util"
"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",
Short: "Pull an image from a registry",
Long: pullDescription,
RunE: func(cmd *cobra.Command, args []string) error {
pullCommand.InputArgs = args
pullCommand.GlobalFlags = MainGlobalOpts
return pullCmd(&pullCommand)
},
Example: "",
}
)
func init() {
pullCommand.Command = _pullCommand
flags := pullCommand.Flags()
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.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")
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 (default: true)")
}
// 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) error {
runtime, err := adapter.GetRuntime(&c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
args := c.InputArgs
if len(args) == 0 {
logrus.Errorf("an image name must be specified")
return nil
}
if len(args) > 1 {
logrus.Errorf("too many arguments. Requires exactly 1")
return nil
}
image := 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
imgID string
)
if !c.Quiet {
writer = os.Stderr
}
dockerRegistryOptions := image2.DockerRegistryOptions{
DockerRegistryCreds: registryCreds,
DockerCertPath: c.CertDir,
}
if c.Flag("tls-verify").Changed {
dockerRegistryOptions.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!c.TlsVerify)
}
// Possible for docker-archive to have multiple tags, so use LoadFromArchiveReference instead
if strings.HasPrefix(image, dockerarchive.Transport.Name()+":") {
srcRef, err := alltransports.ParseImageName(image)
if err != nil {
return errors.Wrapf(err, "error parsing %q", image)
}
newImage, err := runtime.LoadFromArchiveReference(getContext(), srcRef, c.SignaturePolicy, writer)
if err != nil {
return errors.Wrapf(err, "error pulling image from %q", image)
}
imgID = newImage[0].ID()
} else {
authfile := getAuthFile(c.Authfile)
newImage, err := runtime.New(getContext(), image, c.SignaturePolicy, authfile, writer, &dockerRegistryOptions, image2.SigningOptions{}, true, nil)
if err != nil {
return errors.Wrapf(err, "error pulling image %q", image)
}
imgID = newImage.ID()
}
// Intentionally choosing to ignore if there is an error because
// outputting the image ID is a NTH and not integral to the pull
fmt.Println(imgID)
return nil
}
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