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driver_docker.go
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driver_docker.go
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package docker
import (
"bytes"
"fmt"
"io"
"log"
"os"
"os/exec"
"regexp"
"strings"
"sync"
"github.com/hashicorp/go-version"
packersdk "github.com/hashicorp/packer-plugin-sdk/packer"
"github.com/hashicorp/packer-plugin-sdk/template/interpolate"
)
type DockerDriver struct {
Ui packersdk.Ui
Ctx *interpolate.Context
l sync.Mutex
}
func (d *DockerDriver) DeleteImage(id string) error {
var stderr bytes.Buffer
cmd := exec.Command("docker", "rmi", id)
cmd.Stderr = &stderr
log.Printf("Deleting image: %s", id)
if err := cmd.Start(); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
err = fmt.Errorf("Error deleting image: %s\nStderr: %s",
err, stderr.String())
return err
}
return nil
}
func (d *DockerDriver) Commit(id string, author string, changes []string, message string) (string, error) {
var stdout bytes.Buffer
var stderr bytes.Buffer
args := []string{"commit"}
if author != "" {
args = append(args, "--author", author)
}
for _, change := range changes {
args = append(args, "--change", change)
}
if message != "" {
args = append(args, "--message", message)
}
args = append(args, id)
log.Printf("Committing container with args: %v", args)
cmd := exec.Command("docker", args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Start(); err != nil {
return "", err
}
if err := cmd.Wait(); err != nil {
err = fmt.Errorf("Error committing container: %s\nStderr: %s",
err, stderr.String())
return "", err
}
return strings.TrimSpace(stdout.String()), nil
}
func (d *DockerDriver) Export(id string, dst io.Writer) error {
var stderr bytes.Buffer
cmd := exec.Command("docker", "export", id)
cmd.Stdout = dst
cmd.Stderr = &stderr
log.Printf("Exporting container: %s", id)
if err := cmd.Start(); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
err = fmt.Errorf("Error exporting: %s\nStderr: %s",
err, stderr.String())
return err
}
return nil
}
func (d *DockerDriver) Import(path string, changes []string, repo string) (string, error) {
var stdout, stderr bytes.Buffer
args := []string{"import"}
for _, change := range changes {
args = append(args, "--change", change)
}
args = append(args, "-")
args = append(args, repo)
cmd := exec.Command("docker", args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
stdin, err := cmd.StdinPipe()
if err != nil {
return "", err
}
// There should be only one artifact of the Docker builder
file, err := os.Open(path)
if err != nil {
return "", err
}
defer file.Close()
log.Printf("Importing tarball with args: %v", args)
if err := cmd.Start(); err != nil {
return "", err
}
go func() {
defer stdin.Close()
//nolint
io.Copy(stdin, file)
}()
if err := cmd.Wait(); err != nil {
return "", fmt.Errorf("Error importing container: %s\n\nStderr: %s", err, stderr.String())
}
return strings.TrimSpace(stdout.String()), nil
}
func (d *DockerDriver) IPAddress(id string) (string, error) {
var stderr, stdout bytes.Buffer
cmd := exec.Command(
"docker",
"inspect",
"--format",
"{{ .NetworkSettings.IPAddress }}",
id)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
return "", fmt.Errorf("Error: %s\n\nStderr: %s", err, stderr.String())
}
return strings.TrimSpace(stdout.String()), nil
}
// Sha256 retrieves the image Id using Docker inspect.
func (d *DockerDriver) Sha256(id string) (string, error) {
var stderr, stdout bytes.Buffer
cmd := exec.Command(
"docker",
"inspect",
"--format",
"{{ .Id }}",
id)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
return "", fmt.Errorf("Error: %s\n\nStderr: %s", err, stderr.String())
}
return strings.TrimSpace(stdout.String()), nil
}
// Digest retrieves the digest of the image using Docker inspect.
// Format for the digest is: <repo>@sha256:<shasum>
// For example:
// ubuntu@sha256:454054f5bbd571b088db25b662099c6c7b3f0cb78536a2077d54adc48f00cd68
// This can be considered a source of truth for pointing to a specific image
// at a specific point in time.
func (d *DockerDriver) Digest(id string) (string, error) {
var stderr, stdout bytes.Buffer
cmd := exec.Command(
"docker",
"inspect",
"--format",
"{{ ( index .RepoDigests 0 ) }}",
id)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
return "", fmt.Errorf("Error: %s\n\nStderr: %s", err, stderr.String())
}
return strings.TrimSpace(stdout.String()), nil
}
func (d *DockerDriver) Login(repo, user, pass string) error {
d.l.Lock()
version_running, err := d.Version()
if err != nil {
d.l.Unlock()
return err
}
// Version 17.07.0 of Docker adds support for the new
// `--password-stdin` option which can be used to offer
// password via the standard input, rather than passing
// the password and/or token using a command line switch.
constraint, err := version.NewConstraint(">= 17.07.0")
if err != nil {
d.l.Unlock()
return err
}
cmd := exec.Command("docker")
cmd.Args = append(cmd.Args, "login")
if user != "" {
cmd.Args = append(cmd.Args, "-u", user)
}
if pass != "" {
if constraint.Check(version_running) {
cmd.Args = append(cmd.Args, "--password-stdin")
stdin, err := cmd.StdinPipe()
if err != nil {
d.l.Unlock()
return err
}
_, err = io.WriteString(stdin, pass)
if err != nil {
return err
}
stdin.Close()
} else {
cmd.Args = append(cmd.Args, "-p", pass)
}
}
if repo != "" {
cmd.Args = append(cmd.Args, repo)
}
err = runAndStream(cmd, d.Ui)
if err != nil {
d.l.Unlock()
return err
}
return nil
}
func (d *DockerDriver) Logout(repo string) error {
args := []string{"logout"}
if repo != "" {
args = append(args, repo)
}
cmd := exec.Command("docker", args...)
err := runAndStream(cmd, d.Ui)
d.l.Unlock()
return err
}
func (d *DockerDriver) Pull(image string) error {
cmd := exec.Command("docker", "pull", image)
return runAndStream(cmd, d.Ui)
}
func (d *DockerDriver) Push(name string) error {
cmd := exec.Command("docker", "push", name)
return runAndStream(cmd, d.Ui)
}
func (d *DockerDriver) SaveImage(id string, dst io.Writer) error {
var stderr bytes.Buffer
cmd := exec.Command("docker", "save", id)
cmd.Stdout = dst
cmd.Stderr = &stderr
log.Printf("Exporting image: %s", id)
if err := cmd.Start(); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
err = fmt.Errorf("Error exporting: %s\nStderr: %s",
err, stderr.String())
return err
}
return nil
}
func (d *DockerDriver) StartContainer(config *ContainerConfig) (string, error) {
// Build up the template data
var tplData startContainerTemplate
tplData.Image = config.Image
ictx := *d.Ctx
ictx.Data = &tplData
// Args that we're going to pass to Docker
args := []string{"run"}
for _, v := range config.Device {
args = append(args, "--device", v)
}
for _, v := range config.CapAdd {
args = append(args, "--cap-add", v)
}
for _, v := range config.CapDrop {
args = append(args, "--cap-drop", v)
}
if config.Privileged {
args = append(args, "--privileged")
}
for _, v := range config.TmpFs {
args = append(args, "--tmpfs", v)
}
for host, guest := range config.Volumes {
args = append(args, "-v", fmt.Sprintf("%s:%s", host, guest))
}
for _, v := range config.RunCommand {
v, err := interpolate.Render(v, &ictx)
if err != nil {
return "", err
}
args = append(args, v)
}
d.Ui.Message(fmt.Sprintf(
"Run command: docker %s", strings.Join(args, " ")))
// Start the container
var stdout, stderr bytes.Buffer
cmd := exec.Command("docker", args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
log.Printf("Starting container with args: %v", args)
if err := cmd.Start(); err != nil {
return "", err
}
log.Println("Waiting for container to finish starting")
if err := cmd.Wait(); err != nil {
if _, ok := err.(*exec.ExitError); ok {
err = fmt.Errorf("Docker exited with a non-zero exit status.\nStderr: %s",
stderr.String())
}
return "", err
}
// Capture the container ID, which is alone on stdout
return strings.TrimSpace(stdout.String()), nil
}
func (d *DockerDriver) StopContainer(id string) error {
if err := exec.Command("docker", "stop", id).Run(); err != nil {
return err
}
return nil
}
func (d *DockerDriver) KillContainer(id string) error {
if err := exec.Command("docker", "kill", id).Run(); err != nil {
return err
}
return exec.Command("docker", "rm", id).Run()
}
func (d *DockerDriver) TagImage(id string, repo string, force bool) error {
args := []string{"tag"}
// detect running docker version before tagging
// flag `force` for docker tagging was removed after Docker 1.12.0
// to keep its backward compatibility, we are not going to remove `force`
// option, but to ignore it when Docker version >= 1.12.0
//
// for more detail, please refer to the following links:
// - https://docs.docker.com/engine/deprecated/#/f-flag-on-docker-tag
// - https://github.com/docker/docker/pull/23090
version_running, err := d.Version()
if err != nil {
return err
}
version_deprecated, err := version.NewVersion("1.12.0")
if err != nil {
// should never reach this line
return err
}
if force {
if version_running.LessThan(version_deprecated) {
args = append(args, "-f")
} else {
// do nothing if Docker version >= 1.12.0
log.Printf("[WARN] option: \"force\" will be ignored here")
log.Printf("since it was removed after Docker 1.12.0 released")
}
}
args = append(args, id, repo)
var stderr bytes.Buffer
cmd := exec.Command("docker", args...)
cmd.Stderr = &stderr
if err := cmd.Start(); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
err = fmt.Errorf("Error tagging image: %s\nStderr: %s",
err, stderr.String())
return err
}
return nil
}
func (d *DockerDriver) Verify() error {
if _, err := exec.LookPath("docker"); err != nil {
return err
}
return nil
}
func (d *DockerDriver) Version() (*version.Version, error) {
output, err := exec.Command("docker", "-v").Output()
if err != nil {
return nil, err
}
match := regexp.MustCompile(version.VersionRegexpRaw).FindSubmatch(output)
if match == nil {
return nil, fmt.Errorf("unknown version: %s", output)
}
return version.NewVersion(string(match[0]))
}