feat: save container images

cmd/container.go

@@ -7,6 +7,7 @@ package cmd
 import (
 	"fmt"
 	"os/exec"
+	"path/filepath"
 	"strings"
 
 	"github.com/rs/zerolog/log"
@@ -18,6 +19,7 @@ type ContainerCmd struct {
 	Filter string `help:"filter by name"`
 
 	List    ContainerListCmd    `cmd:"" help:"list containers"`
+	Save    ContainerSaveCmd    `cmd:"" help:"save containers"`
 	Cleanup ContainerCleanupCmd `cmd:"" help:"cleanup containers"`
 }
 
@@ -45,6 +47,37 @@ func (cmd ContainerListCmd) Run(containerCmd *ContainerCmd) (err error) {
 	return
 }
 
+type ContainerSaveCmd struct {
+	OutDir string `help:"directory to save containers" default:"./" type:"existingdir"`
+}
+
+func (cmd ContainerSaveCmd) Run(containerCmd *ContainerCmd) (err error) {
+	for _, name := range containerCmd.Containers() {
+		nlog := log.With().Str("name", name).Logger()
+
+		output := filepath.Join(cmd.OutDir, name+".tar")
+		nlog.Info().Msgf("saving to %v")
+
+		err = container.Save(name, output)
+		if err != nil {
+			return
+		}
+
+		compressed := output + ".gz"
+		nlog.Info().Msgf("compressing to %v", compressed)
+
+		var raw []byte
+		raw, err = exec.Command("gzip", output).CombinedOutput()
+		if err != nil {
+			nlog.Error().Err(err).Msg(string(raw))
+			return
+		}
+
+		nlog.Info().Msg("done")
+	}
+	return
+}
+
 type ContainerCleanupCmd struct{}
 
 func (cmd ContainerCleanupCmd) Run(containerCmd *ContainerCmd) (err error) {