github.com/mmcquillan/packer@v1.1.1-0.20171009221028-c85cf0483a5d/builder/lxc/step_lxc_create.go (about)

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