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package images
import (
"context"
"os"
"strings"
"github.com/containers/common/pkg/completion"
"github.com/containers/podman/v3/cmd/podman/common"
"github.com/containers/podman/v3/cmd/podman/parse"
"github.com/containers/podman/v3/cmd/podman/registry"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/containers/podman/v3/pkg/util"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"golang.org/x/crypto/ssh/terminal"
)
var (
validFormats = []string{define.OCIManifestDir, define.OCIArchive, define.V2s2ManifestDir, define.V2s2Archive}
containerConfig = registry.PodmanConfig()
)
var (
saveDescription = `Save an image to docker-archive or oci-archive on the local machine. Default is docker-archive.`
saveCommand = &cobra.Command{
Use: "save [options] IMAGE [IMAGE...]",
Short: "Save image(s) to an archive",
Long: saveDescription,
RunE: save,
Args: func(cmd *cobra.Command, args []string) error {
if len(args) == 0 {
return errors.Errorf("need at least 1 argument")
}
format, err := cmd.Flags().GetString("format")
if err != nil {
return err
}
if !util.StringInSlice(format, validFormats) {
return errors.Errorf("format value must be one of %s", strings.Join(validFormats, " "))
}
return nil
},
ValidArgsFunction: common.AutocompleteImages,
Example: `podman save --quiet -o myimage.tar imageID
podman save --format docker-dir -o ubuntu-dir ubuntu
podman save > alpine-all.tar alpine:latest`,
}
imageSaveCommand = &cobra.Command{
Args: saveCommand.Args,
Use: saveCommand.Use,
Short: saveCommand.Short,
Long: saveCommand.Long,
RunE: saveCommand.RunE,
ValidArgsFunction: saveCommand.ValidArgsFunction,
Example: `podman image save --quiet -o myimage.tar imageID
podman image save --format docker-dir -o ubuntu-dir ubuntu
podman image save > alpine-all.tar alpine:latest`,
}
)
var (
saveOpts entities.ImageSaveOptions
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: saveCommand,
})
saveFlags(saveCommand)
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: imageSaveCommand,
Parent: imageCmd,
})
saveFlags(imageSaveCommand)
}
func saveFlags(cmd *cobra.Command) {
flags := cmd.Flags()
flags.BoolVar(&saveOpts.Compress, "compress", false, "Compress tarball image layers when saving to a directory using the 'dir' transport. (default is same compression type as source)")
formatFlagName := "format"
flags.StringVar(&saveOpts.Format, formatFlagName, define.V2s2Archive, "Save image to oci-archive, oci-dir (directory with oci manifest type), docker-archive, docker-dir (directory with v2s2 manifest type)")
_ = cmd.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteImageSaveFormat)
outputFlagName := "output"
flags.StringVarP(&saveOpts.Output, outputFlagName, "o", "", "Write to a specified file (default: stdout, which must be redirected)")
_ = cmd.RegisterFlagCompletionFunc(outputFlagName, completion.AutocompleteDefault)
flags.BoolVarP(&saveOpts.Quiet, "quiet", "q", false, "Suppress the output")
flags.BoolVarP(&saveOpts.MultiImageArchive, "multi-image-archive", "m", containerConfig.Engine.MultiImageArchive, "Interpret additional arguments as images not tags and create a multi-image-archive (only for docker-archive)")
}
func save(cmd *cobra.Command, args []string) (finalErr error) {
var (
tags []string
succeeded = false
)
if cmd.Flag("compress").Changed && (saveOpts.Format != define.OCIManifestDir && saveOpts.Format != define.V2s2ManifestDir && saveOpts.Format == "") {
return errors.Errorf("--compress can only be set when --format is either 'oci-dir' or 'docker-dir'")
}
if len(saveOpts.Output) == 0 {
saveOpts.Quiet = true
fi := os.Stdout
if terminal.IsTerminal(int(fi.Fd())) {
return errors.Errorf("refusing to save to terminal. Use -o flag or redirect")
}
pipePath, cleanup, err := setupPipe()
if err != nil {
return err
}
if cleanup != nil {
defer func() {
errc := cleanup()
if succeeded {
writeErr := <-errc
if writeErr != nil && finalErr == nil {
finalErr = writeErr
}
}
}()
}
saveOpts.Output = pipePath
}
if err := parse.ValidateFileName(saveOpts.Output); err != nil {
return err
}
if len(args) > 1 {
tags = args[1:]
}
err := registry.ImageEngine().Save(context.Background(), args[0], tags, saveOpts)
if err == nil {
succeeded = true
}
return err
}
|
