github.com/StackPointCloud/packer@v0.10.2-0.20180716202532-b28098e0f79b/builder/lxc/step_lxc_create.go (about)

     1  package lxc
     2  
     3  import (
     4  	"bytes"
     5  	"context"
     6  	"fmt"
     7  	"log"
     8  	"os/exec"
     9  	"path/filepath"
    10  	"strings"
    11  
    12  	"github.com/hashicorp/packer/helper/multistep"
    13  	"github.com/hashicorp/packer/packer"
    14  )
    15  
    16  type stepLxcCreate struct{}
    17  
    18  func (s *stepLxcCreate) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
    19  	config := state.Get("config").(*Config)
    20  	ui := state.Get("ui").(packer.Ui)
    21  
    22  	name := config.ContainerName
    23  
    24  	// TODO: read from env
    25  	lxc_dir := "/var/lib/lxc"
    26  	rootfs := filepath.Join(lxc_dir, name, "rootfs")
    27  
    28  	if config.PackerForce {
    29  		s.Cleanup(state)
    30  	}
    31  
    32  	commands := make([][]string, 3)
    33  	commands[0] = append(config.EnvVars, "lxc-create")
    34  	commands[0] = append(commands[0], config.CreateOptions...)
    35  	commands[0] = append(commands[0], []string{"-n", name, "-t", config.Name, "--"}...)
    36  	commands[0] = append(commands[0], config.Parameters...)
    37  	// prevent tmp from being cleaned on boot, we put provisioning scripts there
    38  	// todo: wait for init to finish before moving on to provisioning instead of this
    39  	commands[1] = []string{"touch", filepath.Join(rootfs, "tmp", ".tmpfs")}
    40  	commands[2] = append([]string{"lxc-start"}, config.StartOptions...)
    41  	commands[2] = append(commands[2], []string{"-d", "--name", name}...)
    42  
    43  	ui.Say("Creating container...")
    44  	for _, command := range commands {
    45  		log.Printf("Executing sudo command: %#v", command)
    46  		err := s.SudoCommand(command...)
    47  		if err != nil {
    48  			err := fmt.Errorf("Error creating container: %s", err)
    49  			state.Put("error", err)
    50  			ui.Error(err.Error())
    51  			return multistep.ActionHalt
    52  		}
    53  	}
    54  
    55  	state.Put("mount_path", rootfs)
    56  
    57  	return multistep.ActionContinue
    58  }
    59  
    60  func (s *stepLxcCreate) Cleanup(state multistep.StateBag) {
    61  	config := state.Get("config").(*Config)
    62  	ui := state.Get("ui").(packer.Ui)
    63  
    64  	command := []string{
    65  		"lxc-destroy", "-f", "-n", config.ContainerName,
    66  	}
    67  
    68  	ui.Say("Unregistering and deleting virtual machine...")
    69  	if err := s.SudoCommand(command...); err != nil {
    70  		ui.Error(fmt.Sprintf("Error deleting virtual machine: %s", err))
    71  	}
    72  }
    73  
    74  func (s *stepLxcCreate) SudoCommand(args ...string) error {
    75  	var stdout, stderr bytes.Buffer
    76  
    77  	log.Printf("Executing sudo command: %#v", args)
    78  	cmd := exec.Command("sudo", args...)
    79  	cmd.Stdout = &stdout
    80  	cmd.Stderr = &stderr
    81  	err := cmd.Run()
    82  
    83  	stdoutString := strings.TrimSpace(stdout.String())
    84  	stderrString := strings.TrimSpace(stderr.String())
    85  
    86  	if _, ok := err.(*exec.ExitError); ok {
    87  		err = fmt.Errorf("Sudo command error: %s", stderrString)
    88  	}
    89  
    90  	log.Printf("stdout: %s", stdoutString)
    91  	log.Printf("stderr: %s", stderrString)
    92  
    93  	return err
    94  }