podmanv2 export

add ability to export a container to a tarball

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

1 files changed, 57 insertions, 0 deletions

diff --git a/cmd/podmanV2/containers/export.go b/cmd/podmanV2/containers/export.go
new file mode 100644
index 000000000..b93b60878
--- /dev/null
+++ b/cmd/podmanV2/containers/export.go
@@ -0,0 +1,57 @@
+package containers
+
+import (
+	"context"
+	"os"
+
+	"github.com/containers/libpod/cmd/podmanV2/parse"
+	"github.com/containers/libpod/cmd/podmanV2/registry"
+	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+	"golang.org/x/crypto/ssh/terminal"
+)
+
+var (
+	exportDescription = "Exports container's filesystem contents as a tar archive" +
+		" and saves it on the local machine."
+
+	exportCommand = &cobra.Command{
+		Use:               "export [flags] CONTAINER",
+		Short:             "Export container's filesystem contents as a tar archive",
+		Long:              exportDescription,
+		PersistentPreRunE: preRunE,
+		RunE:              export,
+		Args:              cobra.ExactArgs(1),
+		Example: `podman export ctrID > myCtr.tar
+  podman export --output="myCtr.tar" ctrID`,
+	}
+)
+
+var (
+	exportOpts entities.ContainerExportOptions
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: exportCommand,
+	})
+	exportCommand.SetHelpTemplate(registry.HelpTemplate())
+	exportCommand.SetUsageTemplate(registry.UsageTemplate())
+	flags := exportCommand.Flags()
+	flags.StringVarP(&exportOpts.Output, "output", "o", "", "Write to a specified file (default: stdout, which must be redirected)")
+}
+
+func export(cmd *cobra.Command, args []string) error {
+	if len(exportOpts.Output) == 0 {
+		file := os.Stdout
+		if terminal.IsTerminal(int(file.Fd())) {
+			return errors.Errorf("refusing to export to terminal. Use -o flag or redirect")
+		}
+		exportOpts.Output = "/dev/stdout"
+	} else if err := parse.ValidateFileName(exportOpts.Output); err != nil {
+		return err
+	}
+	return registry.ContainerEngine().ContainerExport(context.Background(), args[0], exportOpts)
+}