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package lxc
import (
"bytes"
"fmt"
"github.com/hashicorp/packer/packer"
"github.com/mitchellh/multistep"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
)
type stepExport struct{}
func (s *stepExport) Run(state multistep.StateBag) multistep.StepAction {
config := state.Get("config").(*Config)
ui := state.Get("ui").(packer.Ui)
name := config.ContainerName
containerDir := fmt.Sprintf("/var/lib/lxc/%s", name)
outputPath := filepath.Join(config.OutputDir, "rootfs.tar.gz")
configFilePath := filepath.Join(config.OutputDir, "lxc-config")
configFile, err := os.Create(configFilePath)
if err != nil {
err := fmt.Errorf("Error creating config file: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
originalConfigFile, err := os.Open(config.ConfigFile)
if err != nil {
err := fmt.Errorf("Error opening config file: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
_, err = io.Copy(configFile, originalConfigFile)
commands := make([][]string, 4)
commands[0] = []string{
"lxc-stop", "--name", name,
}
commands[1] = []string{
"tar", "-C", containerDir, "--numeric-owner", "--anchored", "--exclude=./rootfs/dev/log", "-czf", outputPath, "./rootfs",
}
commands[2] = []string{
"chmod", "+x", configFilePath,
}
commands[3] = []string{
"sh", "-c", "chown $USER:`id -gn` " + filepath.Join(config.OutputDir, "*"),
}
ui.Say("Exporting container...")
for _, command := range commands {
err := s.SudoCommand(command...)
if err != nil {
err := fmt.Errorf("Error exporting container: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
}
return multistep.ActionContinue
}
func (s *stepExport) Cleanup(state multistep.StateBag) {}
func (s *stepExport) SudoCommand(args ...string) error {
var stdout, stderr bytes.Buffer
log.Printf("Executing sudo command: %#v", args)
cmd := exec.Command("sudo", args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
err := cmd.Run()
stdoutString := strings.TrimSpace(stdout.String())
stderrString := strings.TrimSpace(stderr.String())
if _, ok := err.(*exec.ExitError); ok {
err = fmt.Errorf("Sudo command error: %s", stderrString)
}
log.Printf("stdout: %s", stdoutString)
log.Printf("stderr: %s", stderrString)
return err
}
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