podmanv2 save image

add ability to save an image for podman v2

Signed-off-by: Brent Baude <bbaude@redhat.com>

10 files changed, 216 insertions, 16 deletions

diff --git a/cmd/podmanV2/images/save.go b/cmd/podmanV2/images/save.go
new file mode 100644
index 000000000..ae39b7bce
--- /dev/null
+++ b/cmd/podmanV2/images/save.go
@@ -0,0 +1,87 @@
+package images
+
+import (
+	"context"
+	"os"
+	"strings"
+
+	"github.com/containers/libpod/libpod/define"
+
+	"github.com/containers/libpod/cmd/podmanV2/parse"
+	"github.com/containers/libpod/cmd/podmanV2/registry"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/containers/libpod/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}
+
+var (
+	saveDescription = `Save an image to docker-archive or oci-archive on the local machine. Default is docker-archive.`
+
+	saveCommand = &cobra.Command{
+		Use:               "save [flags] IMAGE",
+		Short:             "Save image to an archive",
+		Long:              saveDescription,
+		PersistentPreRunE: preRunE,
+		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
+		},
+		Example: `podman save --quiet -o myimage.tar imageID
+  podman save --format docker-dir -o ubuntu-dir ubuntu
+  podman 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,
+	})
+	flags := saveCommand.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)")
+	flags.StringVar(&saveOpts.Format, "format", define.V2s2Archive, "Save image to oci-archive, oci-dir (directory with oci manifest type), docker-archive, docker-dir (directory with v2s2 manifest type)")
+	flags.StringVarP(&saveOpts.Output, "output", "o", "", "Write to a specified file (default: stdout, which must be redirected)")
+	flags.BoolVarP(&saveOpts.Quiet, "quiet", "q", false, "Suppress the output")
+
+}
+
+func save(cmd *cobra.Command, args []string) error {
+	var (
+		tags []string
+	)
+	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 {
+		fi := os.Stdout
+		if terminal.IsTerminal(int(fi.Fd())) {
+			return errors.Errorf("refusing to save to terminal. Use -o flag or redirect")
+		}
+		saveOpts.Output = "/dev/stdout"
+	}
+	if err := parse.ValidateFileName(saveOpts.Output); err != nil {
+		return err
+	}
+	if len(args) > 1 {
+		tags = args[1:]
+	}
+	return registry.ImageEngine().Save(context.Background(), args[0], tags, saveOpts)
+}
diff --git a/libpod/define/config.go b/libpod/define/config.go
index 5598f97a3..7b967f17d 100644
--- a/libpod/define/config.go
+++ b/libpod/define/config.go
@@ -26,3 +26,10 @@ type InfoData struct {
 // VolumeDriverLocal is the "local" volume driver. It is managed by libpod
 // itself.
 const VolumeDriverLocal = "local"
+
+const (
+	OCIManifestDir  = "oci-dir"
+	OCIArchive      = "oci-archive"
+	V2s2ManifestDir = "docker-dir"
+	V2s2Archive     = "docker-archive"
+)
diff --git a/pkg/api/handlers/libpod/images.go b/pkg/api/handlers/libpod/images.go
index e7f20854c..850de4598 100644
--- a/pkg/api/handlers/libpod/images.go
+++ b/pkg/api/handlers/libpod/images.go
@@ -16,12 +16,14 @@ import (
 	"github.com/containers/image/v5/manifest"
 	"github.com/containers/image/v5/types"
 	"github.com/containers/libpod/libpod"
+	"github.com/containers/libpod/libpod/define"
 	"github.com/containers/libpod/libpod/image"
 	image2 "github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/api/handlers"
 	"github.com/containers/libpod/pkg/api/handlers/utils"
 	"github.com/containers/libpod/pkg/domain/entities"
 	"github.com/containers/libpod/pkg/util"
+	utils2 "github.com/containers/libpod/utils"
 	"github.com/gorilla/schema"
 	"github.com/pkg/errors"
 )
@@ -161,13 +163,16 @@ func PruneImages(w http.ResponseWriter, r *http.Request) {
 }
 
 func ExportImage(w http.ResponseWriter, r *http.Request) {
+	var (
+		output string
+	)
 	runtime := r.Context().Value("runtime").(*libpod.Runtime)
 	decoder := r.Context().Value("decoder").(*schema.Decoder)
 	query := struct {
 		Compress bool   `schema:"compress"`
 		Format   string `schema:"format"`
 	}{
-		Format: "docker-archive",
+		Format: define.OCIArchive,
 	}
 
 	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
@@ -175,14 +180,27 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 			errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
 		return
 	}
-
-	tmpfile, err := ioutil.TempFile("", "api.tar")
-	if err != nil {
-		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempfile"))
-		return
-	}
-	if err := tmpfile.Close(); err != nil {
-		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to close tempfile"))
+	switch query.Format {
+	case define.OCIArchive, define.V2s2Archive:
+		tmpfile, err := ioutil.TempFile("", "api.tar")
+		if err != nil {
+			utils.Error(w, "unable to create tmpfile", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempfile"))
+			return
+		}
+		output = tmpfile.Name()
+		if err := tmpfile.Close(); err != nil {
+			utils.Error(w, "unable to close tmpfile", http.StatusInternalServerError, errors.Wrap(err, "unable to close tempfile"))
+			return
+		}
+	case define.OCIManifestDir, define.V2s2ManifestDir:
+		tmpdir, err := ioutil.TempDir("", "save")
+		if err != nil {
+			utils.Error(w, "unable to create tmpdir", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempdir"))
+			return
+		}
+		output = tmpdir
+	default:
+		utils.Error(w, "unknown format", http.StatusInternalServerError, errors.Errorf("unknown format %q", query.Format))
 		return
 	}
 	name := utils.GetName(r)
@@ -192,17 +210,28 @@ func ExportImage(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := newImage.Save(r.Context(), name, query.Format, tmpfile.Name(), []string{}, false, query.Compress); err != nil {
+	if err := newImage.Save(r.Context(), name, query.Format, output, []string{}, false, query.Compress); err != nil {
 		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest, err)
 		return
 	}
-	rdr, err := os.Open(tmpfile.Name())
+	defer os.RemoveAll(output)
+	// if dir format, we need to tar it
+	if query.Format == "oci-dir" || query.Format == "docker-dir" {
+		rdr, err := utils2.Tar(output)
+		if err != nil {
+			utils.InternalServerError(w, err)
+			return
+		}
+		defer rdr.Close()
+		utils.WriteResponse(w, http.StatusOK, rdr)
+		return
+	}
+	rdr, err := os.Open(output)
 	if err != nil {
 		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "failed to read the exported tarfile"))
 		return
 	}
 	defer rdr.Close()
-	defer os.Remove(tmpfile.Name())
 	utils.WriteResponse(w, http.StatusOK, rdr)
 }
 
diff --git a/pkg/api/handlers/utils/handler.go b/pkg/api/handlers/utils/handler.go
index 32b8c5b0a..b5bd488fb 100644
--- a/pkg/api/handlers/utils/handler.go
+++ b/pkg/api/handlers/utils/handler.go
@@ -46,6 +46,13 @@ func WriteResponse(w http.ResponseWriter, code int, value interface{}) {
 		if _, err := io.Copy(w, v); err != nil {
 			logrus.Errorf("unable to copy to response: %q", err)
 		}
+	case io.Reader:
+		w.Header().Set("Content-Type", "application/x-tar")
+		w.WriteHeader(code)
+
+		if _, err := io.Copy(w, v); err != nil {
+			logrus.Errorf("unable to copy to response: %q", err)
+		}
 	default:
 		WriteJSON(w, code, value)
 	}
diff --git a/pkg/api/server/register_images.go b/pkg/api/server/register_images.go
index e4e46025b..d45423096 100644
--- a/pkg/api/server/register_images.go
+++ b/pkg/api/server/register_images.go
@@ -955,7 +955,7 @@ func (s *APIServer) registerImagesHandlers(r *mux.Router) error {
 	// tags:
 	//  - images
 	// summary: Export an image
-	// description: Export an image as a tarball
+	// description: Export an image
 	// parameters:
 	//  - in: path
 	//    name: name:.*
diff --git a/pkg/bindings/images/images.go b/pkg/bindings/images/images.go
index dcb568d6b..1b3df609b 100644
--- a/pkg/bindings/images/images.go
+++ b/pkg/bindings/images/images.go
@@ -146,11 +146,12 @@ func Export(ctx context.Context, nameOrID string, w io.Writer, format *string, c
 	if err != nil {
 		return err
 	}
-	if err := response.Process(nil); err != nil {
+
+	if response.StatusCode/100 == 2 || response.StatusCode/100 == 3 {
+		_, err = io.Copy(w, response.Body)
 		return err
 	}
-	_, err = io.Copy(w, response.Body)
-	return err
+	return nil
 }
 
 // Prune removes unused images from local storage.  The optional filters can be used to further
diff --git a/pkg/domain/entities/engine_image.go b/pkg/domain/entities/engine_image.go
index 04b9d34e6..a28bfc548 100644
--- a/pkg/domain/entities/engine_image.go
+++ b/pkg/domain/entities/engine_image.go
@@ -17,4 +17,5 @@ type ImageEngine interface {
 	Load(ctx context.Context, opts ImageLoadOptions) (*ImageLoadReport, error)
 	Import(ctx context.Context, opts ImageImportOptions) (*ImageImportReport, error)
 	Push(ctx context.Context, source string, destination string, opts ImagePushOptions) error
+	Save(ctx context.Context, nameOrId string, tags []string, options ImageSaveOptions) error
 }
diff --git a/pkg/domain/entities/images.go b/pkg/domain/entities/images.go
index d66de3c5e..bc8a34c13 100644
--- a/pkg/domain/entities/images.go
+++ b/pkg/domain/entities/images.go
@@ -234,3 +234,10 @@ type ImageImportOptions struct {
 type ImageImportReport struct {
 	Id string
 }
+
+type ImageSaveOptions struct {
+	Compress bool
+	Format   string
+	Output   string
+	Quiet    bool
+}
diff --git a/pkg/domain/infra/abi/images.go b/pkg/domain/infra/abi/images.go
index 94008f287..9d706a112 100644
--- a/pkg/domain/infra/abi/images.go
+++ b/pkg/domain/infra/abi/images.go
@@ -405,3 +405,11 @@ func (ir *ImageEngine) Import(ctx context.Context, opts entities.ImageImportOpti
 	}
 	return &entities.ImageImportReport{Id: id}, nil
 }
+
+func (ir *ImageEngine) Save(ctx context.Context, nameOrId string, tags []string, options entities.ImageSaveOptions) error {
+	newImage, err := ir.Libpod.ImageRuntime().NewFromLocal(nameOrId)
+	if err != nil {
+		return err
+	}
+	return newImage.Save(ctx, nameOrId, options.Format, options.Output, tags, options.Quiet, options.Compress)
+}
diff --git a/pkg/domain/infra/tunnel/images.go b/pkg/domain/infra/tunnel/images.go
index 028603d98..516914a68 100644
--- a/pkg/domain/infra/tunnel/images.go
+++ b/pkg/domain/infra/tunnel/images.go
@@ -2,12 +2,14 @@ package tunnel
 
 import (
 	"context"
+	"io/ioutil"
 	"os"
 
 	"github.com/containers/image/v5/docker/reference"
 	images "github.com/containers/libpod/pkg/bindings/images"
 	"github.com/containers/libpod/pkg/domain/entities"
 	"github.com/containers/libpod/pkg/domain/utils"
+	utils2 "github.com/containers/libpod/utils"
 	"github.com/pkg/errors"
 )
 
@@ -188,3 +190,54 @@ func (ir *ImageEngine) Import(ctx context.Context, opts entities.ImageImportOpti
 func (ir *ImageEngine) Push(ctx context.Context, source string, destination string, options entities.ImagePushOptions) error {
 	return images.Push(ir.ClientCxt, source, destination, options)
 }
+
+func (ir *ImageEngine) Save(ctx context.Context, nameOrId string, tags []string, options entities.ImageSaveOptions) error {
+	var (
+		f   *os.File
+		err error
+	)
+
+	switch options.Format {
+	case "oci-dir", "docker-dir":
+		f, err = ioutil.TempFile("", "podman_save")
+		if err == nil {
+			defer func() { _ = os.Remove(f.Name()) }()
+		}
+	default:
+		f, err = os.Create(options.Output)
+	}
+	if err != nil {
+		return err
+	}
+
+	exErr := images.Export(ir.ClientCxt, nameOrId, f, &options.Format, &options.Compress)
+	if err := f.Close(); err != nil {
+		return err
+	}
+	if exErr != nil {
+		return exErr
+	}
+
+	if options.Format != "oci-dir" && options.Format != "docker-dir" {
+		return nil
+	}
+
+	f, err = os.Open(f.Name())
+	if err != nil {
+		return err
+	}
+	info, err := os.Stat(options.Output)
+	switch {
+	case err == nil:
+		if info.Mode().IsRegular() {
+			return errors.Errorf("%q already exists as a regular file", options.Output)
+		}
+	case os.IsNotExist(err):
+		if err := os.Mkdir(options.Output, 0755); err != nil {
+			return err
+		}
+	default:
+		return err
+	}
+	return utils2.UntarToFileSystem(options.Output, f, nil)
+}