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package images
import (
"fmt"
"os"
"strings"
"github.com/containers/common/pkg/auth"
"github.com/containers/common/pkg/completion"
"github.com/containers/image/v5/types"
"github.com/containers/podman/v3/cmd/podman/common"
"github.com/containers/podman/v3/cmd/podman/registry"
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/containers/podman/v3/pkg/util"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
// pullOptionsWrapper wraps entities.ImagePullOptions and prevents leaking
// CLI-only fields into the API types.
type pullOptionsWrapper struct {
entities.ImagePullOptions
TLSVerifyCLI bool // CLI only
CredentialsCLI string
}
var (
pullOptions = pullOptionsWrapper{}
pullDescription = `Pulls an image from a registry and stores it locally.
An image can be pulled by tag or digest. If a tag is not specified, the image with the 'latest' tag is pulled.`
// Command: podman pull
pullCmd = &cobra.Command{
Use: "pull [options] IMAGE",
Args: cobra.ExactArgs(1),
Short: "Pull an image from a registry",
Long: pullDescription,
RunE: imagePull,
ValidArgsFunction: common.AutocompleteImages,
Example: `podman pull imageName
podman pull fedora:latest`,
}
// Command: podman image pull
// It's basically a clone of `pullCmd` with the exception of being a
// child of the images command.
imagesPullCmd = &cobra.Command{
Use: pullCmd.Use,
Args: pullCmd.Args,
Short: pullCmd.Short,
Long: pullCmd.Long,
RunE: pullCmd.RunE,
ValidArgsFunction: pullCmd.ValidArgsFunction,
Example: `podman image pull imageName
podman image pull fedora:latest`,
}
)
func init() {
// pull
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: pullCmd,
})
pullFlags(pullCmd)
// images pull
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: imagesPullCmd,
Parent: imageCmd,
})
pullFlags(imagesPullCmd)
}
// pullFlags set the flags for the pull command.
func pullFlags(cmd *cobra.Command) {
flags := cmd.Flags()
flags.BoolVar(&pullOptions.AllTags, "all-tags", false, "All tagged images in the repository will be pulled")
credsFlagName := "creds"
flags.StringVar(&pullOptions.CredentialsCLI, credsFlagName, "", "`Credentials` (USERNAME:PASSWORD) to use for authenticating to a registry")
_ = cmd.RegisterFlagCompletionFunc(credsFlagName, completion.AutocompleteNone)
archFlagName := "arch"
flags.StringVar(&pullOptions.Arch, archFlagName, "", "Use `ARCH` instead of the architecture of the machine for choosing images")
_ = cmd.RegisterFlagCompletionFunc(archFlagName, completion.AutocompleteArch)
osFlagName := "os"
flags.StringVar(&pullOptions.OS, osFlagName, "", "Use `OS` instead of the running OS for choosing images")
_ = cmd.RegisterFlagCompletionFunc(osFlagName, completion.AutocompleteOS)
variantFlagName := "variant"
flags.StringVar(&pullOptions.Variant, variantFlagName, "", " use VARIANT instead of the running architecture variant for choosing images")
_ = cmd.RegisterFlagCompletionFunc(variantFlagName, completion.AutocompleteNone)
platformFlagName := "platform"
flags.String(platformFlagName, "", "Specify the platform for selecting the image. (Conflicts with arch and os)")
_ = cmd.RegisterFlagCompletionFunc(platformFlagName, completion.AutocompleteNone)
flags.Bool("disable-content-trust", false, "This is a Docker specific option and is a NOOP")
flags.BoolVarP(&pullOptions.Quiet, "quiet", "q", false, "Suppress output information when pulling images")
flags.StringVar(&pullOptions.SignaturePolicy, "signature-policy", "", "`Pathname` of signature policy file (not usually used)")
flags.BoolVar(&pullOptions.TLSVerifyCLI, "tls-verify", true, "Require HTTPS and verify certificates when contacting registries")
authfileFlagName := "authfile"
flags.StringVar(&pullOptions.Authfile, authfileFlagName, auth.GetDefaultAuthFile(), "Path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
_ = cmd.RegisterFlagCompletionFunc(authfileFlagName, completion.AutocompleteDefault)
if !registry.IsRemote() {
certDirFlagName := "cert-dir"
flags.StringVar(&pullOptions.CertDir, certDirFlagName, "", "`Pathname` of a directory containing TLS certificates and keys")
_ = cmd.RegisterFlagCompletionFunc(certDirFlagName, completion.AutocompleteDefault)
}
_ = flags.MarkHidden("signature-policy")
}
// imagePull is implement the command for pulling images.
func imagePull(cmd *cobra.Command, args []string) error {
// TLS verification in c/image is controlled via a `types.OptionalBool`
// which allows for distinguishing among set-true, set-false, unspecified
// which is important to implement a sane way of dealing with defaults of
// boolean CLI flags.
if cmd.Flags().Changed("tls-verify") {
pullOptions.SkipTLSVerify = types.NewOptionalBool(!pullOptions.TLSVerifyCLI)
}
if pullOptions.Authfile != "" {
if _, err := os.Stat(pullOptions.Authfile); err != nil {
return err
}
}
platform, err := cmd.Flags().GetString("platform")
if err != nil {
return err
}
if platform != "" {
if pullOptions.Arch != "" || pullOptions.OS != "" {
return errors.Errorf("--platform option can not be specified with --arch or --os")
}
split := strings.SplitN(platform, "/", 2)
pullOptions.OS = split[0]
if len(split) > 1 {
pullOptions.Arch = split[1]
}
}
if pullOptions.CredentialsCLI != "" {
creds, err := util.ParseRegistryCreds(pullOptions.CredentialsCLI)
if err != nil {
return err
}
pullOptions.Username = creds.Username
pullOptions.Password = creds.Password
}
// Let's do all the remaining Yoga in the API to prevent us from
// scattering logic across (too) many parts of the code.
pullReport, err := registry.ImageEngine().Pull(registry.GetContext(), args[0], pullOptions.ImagePullOptions)
if err != nil {
return err
}
if len(pullReport.Images) > 1 {
fmt.Println("Pulled Images:")
}
for _, img := range pullReport.Images {
fmt.Println(img)
}
return nil
}
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