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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/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/urfave/cli"
)
var (
pullFlags = []cli.Flag{
cli.StringFlag{
Name: "authfile",
Usage: "Path of the authentication file. Default is ${XDG_RUNTIME_DIR}/containers/auth.json. Use REGISTRY_AUTH_FILE environment variable to override. ",
},
cli.StringFlag{
Name: "cert-dir",
Usage: "`pathname` of a directory containing TLS certificates and keys",
},
cli.StringFlag{
Name: "creds",
Usage: "`credentials` (USERNAME:PASSWORD) to use for authenticating to a registry",
},
cli.BoolFlag{
Name: "quiet, q",
Usage: "Suppress output information when pulling images",
},
cli.StringFlag{
Name: "signature-policy",
Usage: "`pathname` of signature policy file (not usually used)",
},
cli.BoolTFlag{
Name: "tls-verify",
Usage: "require HTTPS and verify certificates when contacting registries (default: true)",
},
}
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 = cli.Command{
Name: "pull",
Usage: "Pull an image from a registry",
Description: pullDescription,
Flags: sortFlags(pullFlags),
Action: pullCmd,
ArgsUsage: "",
OnUsageError: usageErrorHandler,
}
)
// 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 *cli.Context) error {
runtime, err := adapter.GetRuntime(c)
if err != nil {
return errors.Wrapf(err, "could not get runtime")
}
defer runtime.Shutdown(false)
args := c.Args()
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
}
if err := validateFlags(c, pullFlags); err != nil {
return err
}
image := args[0]
var registryCreds *types.DockerAuthConfig
if c.IsSet("creds") {
creds, err := util.ParseRegistryCreds(c.String("creds"))
if err != nil {
return err
}
registryCreds = creds
}
var (
writer io.Writer
imgID string
)
if !c.Bool("quiet") {
writer = os.Stderr
}
dockerRegistryOptions := image2.DockerRegistryOptions{
DockerRegistryCreds: registryCreds,
DockerCertPath: c.String("cert-dir"),
}
if c.IsSet("tls-verify") {
dockerRegistryOptions.DockerInsecureSkipTLSVerify = types.NewOptionalBool(!c.BoolT("tls-verify"))
}
// 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.String("signature-policy"), writer)
if err != nil {
return errors.Wrapf(err, "error pulling image from %q", image)
}
imgID = newImage[0].ID()
} else {
authfile := getAuthFile(c.String("authfile"))
newImage, err := runtime.New(getContext(), image, c.String("signature-policy"), authfile, writer, &dockerRegistryOptions, image2.SigningOptions{}, true)
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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