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package main
import (
"io"
"os"
"fmt"
"github.com/containers/image/types"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/libpod"
"github.com/projectatomic/libpod/libpod/common"
"github.com/projectatomic/libpod/pkg/util"
"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",
},
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.\n" +
"An image can be pulled using its tag or digest. If a tag is not\n" +
"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: pullFlags,
Action: pullCmd,
ArgsUsage: "",
}
)
// 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 := 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
if !c.Bool("quiet") {
writer = os.Stderr
}
options := libpod.CopyOptions{
SignaturePolicyPath: c.String("signature-policy"),
AuthFile: c.String("authfile"),
DockerRegistryOptions: common.DockerRegistryOptions{
DockerRegistryCreds: registryCreds,
DockerCertPath: c.String("cert-dir"),
DockerInsecureSkipTLSVerify: !c.BoolT("tls-verify"),
},
Writer: writer,
}
if _, err := runtime.PullImage(image, options); err != nil {
return errors.Wrapf(err, "error pulling image %q", image)
}
newImage := runtime.NewImage(image)
iid, err := newImage.GetImageID()
// Intentially choosing to ignore if there is an error because
// outputting the image ID is a NTH and not integral to the pull
if err == nil {
fmt.Println(iid)
}
return nil
}
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