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package docker
import (
"context"
"fmt"
"os"
"path/filepath"
"github.com/hashicorp/packer/packer-plugin-sdk/multistep"
packersdk "github.com/hashicorp/packer/packer-plugin-sdk/packer"
)
// StepExport exports the container to a flat tar file.
type StepExport struct{}
func (s *StepExport) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
ui := state.Get("ui").(packersdk.Ui)
config, ok := state.Get("config").(*Config)
if !ok {
err := fmt.Errorf("error encountered obtaining docker config")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// We should catch this in validation, but guard anyway
if config.ExportPath == "" {
err := fmt.Errorf("No output file specified, we can't export anything")
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
// Make the directory we're exporting to if it doesn't exist
exportDir := filepath.Dir(config.ExportPath)
if err := os.MkdirAll(exportDir, 0755); err != nil {
state.Put("error", err)
return multistep.ActionHalt
}
// Open the file that we're going to write to
f, err := os.Create(config.ExportPath)
if err != nil {
err := fmt.Errorf("Error creating output file: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
driver := state.Get("driver").(Driver)
containerId := state.Get("container_id").(string)
ui.Say("Exporting the container")
if err := driver.Export(containerId, f); err != nil {
f.Close()
os.Remove(f.Name())
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
f.Close()
return multistep.ActionContinue
}
func (s *StepExport) Cleanup(state multistep.StateBag) {}
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