packer-cn/builder/lxc/step_lxc_create.go

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package lxc
import (
"bytes"
"context"
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"fmt"
"log"
"os/exec"
"path/filepath"
"strings"
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"github.com/hashicorp/packer/helper/multistep"
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"github.com/hashicorp/packer/packer"
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)
type stepLxcCreate struct{}
func (s *stepLxcCreate) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
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config := state.Get("config").(*Config)
ui := state.Get("ui").(packer.Ui)
name := config.ContainerName
// TODO: read from env
lxc_dir := "/var/lib/lxc"
rootfs := filepath.Join(lxc_dir, name, "rootfs")
if config.PackerForce {
s.Cleanup(state)
}
commands := make([][]string, 3)
commands[0] = append(config.EnvVars, "lxc-create")
commands[0] = append(commands[0], config.CreateOptions...)
commands[0] = append(commands[0], []string{"-n", name, "-t", config.Name, "--"}...)
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commands[0] = append(commands[0], config.Parameters...)
// prevent tmp from being cleaned on boot, we put provisioning scripts there
// todo: wait for init to finish before moving on to provisioning instead of this
commands[1] = []string{"touch", filepath.Join(rootfs, "tmp", ".tmpfs")}
commands[2] = append([]string{"lxc-start"}, config.StartOptions...)
commands[2] = append(commands[2], []string{"-d", "--name", name}...)
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ui.Say("Creating container...")
for _, command := range commands {
log.Printf("Executing sudo command: %#v", command)
err := s.SudoCommand(command...)
if err != nil {
err := fmt.Errorf("Error creating container: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
}
state.Put("mount_path", rootfs)
return multistep.ActionContinue
}
func (s *stepLxcCreate) Cleanup(state multistep.StateBag) {
config := state.Get("config").(*Config)
ui := state.Get("ui").(packer.Ui)
command := []string{
"lxc-destroy", "-f", "-n", config.ContainerName,
}
ui.Say("Unregistering and deleting virtual machine...")
if err := s.SudoCommand(command...); err != nil {
ui.Error(fmt.Sprintf("Error deleting virtual machine: %s", err))
}
}
func (s *stepLxcCreate) 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
}