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package docker
import (
"fmt"
"os"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
)
// StepExport exports the container to a flat tar file.
type StepExport struct{}
func (s *StepExport) Run(state multistep.StateBag) multistep.StepAction {
config := state.Get("config").(*Config)
driver := state.Get("driver").(Driver)
containerId := state.Get("container_id").(string)
ui := state.Get("ui").(packer.Ui)
// 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
}
// 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
}
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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