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docker.go
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docker.go
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package docker
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"os/user"
"path/filepath"
"text/template"
"github.com/bottlerocketlabs/localpod/pkg/config"
)
const (
DefaultContainerEntrypoint = "/bin/sh"
DefaultContainerCommand = "echo Container started ; trap \"exit 0\" 15; while sleep 1 & wait $!; do :; done"
DefaultContainerHostname = "localpod"
configSHA1EnvKey = "LOCALPOD_CONFIG_SHA1"
)
var (
ErrExistsButDifferent = fmt.Errorf("container exists, but does not match configuration")
)
func HasDocker() bool {
_, err := exec.LookPath("docker")
if err != nil {
return false
}
return true
}
type Container struct {
ID string
Name string
Config *config.DevContainer
}
func envToDockerArgs(env map[string]string) []string {
var args []string
for k, v := range env {
args = append(args, "--env")
args = append(args, fmt.Sprintf("%s=%s", k, v))
}
return args
}
func mountsToDockerArgs(mounts []string) []string {
var args []string
for _, m := range mounts {
args = append(args, "--mount")
args = append(args, m)
}
return args
}
func buildArgsToDockerArgs(buildArgs map[string]string, env config.Env) []string {
var args []string
for k, v := range buildArgs {
args = append(args, "--build-arg")
args = append(args, fmt.Sprintf("%s=%s", k, os.Expand(v, env.Get)))
}
return args
}
func expandEnvArgs(args []string, env config.Env) []string {
var out []string
for _, e := range args {
out = append(out, os.Expand(e, env.Get))
}
return out
}
func buildCreateArgs(name string, cfg *config.DevContainer) []string {
var args []string
args = append(args, "create")
args = append(args, "--tty", "--interactive")
args = append(args, "--name", name)
args = append(args, "--pull", "missing")
args = append(args, "--hostname", DefaultContainerHostname)
args = append(args, "--user", cfg.ContainerUser)
args = append(args, envToDockerArgs(cfg.ContainerEnv)...)
args = append(args, envToDockerArgs(map[string]string{
configSHA1EnvKey: cfg.SHA1(),
})...)
args = append(args, mountsToDockerArgs(cfg.Mounts)...)
if cfg.WorkspaceMount != "" {
args = append(args, "--mount", cfg.WorkspaceMount)
}
args = append(args, "--workdir", cfg.WorkspaceFolder)
args = append(args, cfg.RunArgs...)
if cfg.OverrideCommand {
args = append(args, "--entrypoint", DefaultContainerEntrypoint)
}
image := cfg.Image
if cfg.Build.Dockerfile != "" && cfg.Build.Target != "" {
image = cfg.Build.Target //assume was built successfully
}
args = append(args, image) // Image
if cfg.OverrideCommand {
args = append(args, "-c", DefaultContainerCommand)
}
return args
}
func BuildImage(cfg *config.DevContainer, env config.Env, stdout, stderr io.Writer) error {
if cfg.Build.Dockerfile == "" {
return nil
}
if cfg.Build.Context == "" {
return fmt.Errorf("build.dockerfile set, but not build.context")
}
if cfg.Build.Target == "" && cfg.Image == "" {
return fmt.Errorf("build.dockerfile set, but not build.target or image")
}
buildTarget := cfg.Build.Target
if buildTarget == "" {
buildTarget = cfg.Image
}
_, err := os.Stat(cfg.Build.Dockerfile)
if os.IsNotExist(err) {
return fmt.Errorf("configured build.dockerfile does not exist: %w", err)
}
if err != nil {
return fmt.Errorf("failed to check for existance of build.dockerfile")
}
args := []string{"build", "--pull", "--tag", buildTarget, "--file", cfg.Build.Dockerfile}
args = append(args, buildArgsToDockerArgs(cfg.Build.Args, env)...)
args = append(args, cfg.Build.Context)
if env.Get("LOCALPOD_DEBUG") == "true" {
fmt.Printf("DEBUG: Building image with: %s\n", args)
}
cmd := exec.Command("docker", args...)
cmd.Stderr = stderr
cmd.Stdout = stdout
err = cmd.Run()
if err != nil {
return fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
return nil
}
func CreateContainer(name string, env config.Env, cfg *config.DevContainer, stdout, stderr io.Writer) (Container, error) {
c := Container{
Config: cfg,
Name: name,
}
existingID, err := c.Exists(name)
c.ID = existingID
if err == nil {
fmt.Printf("DEBUG: container already exists\n")
return c, nil
}
if err == ErrExistsButDifferent {
fmt.Printf("DEBUG: container already exists, but doesnt match configuration. Rebuilding\n")
err := c.Rm()
if err != nil {
return c, fmt.Errorf("failed to remove existing container: %w", err)
}
}
fmt.Printf("DEBUG: inpect: %s\n", err)
args := expandEnvArgs(buildCreateArgs(name, cfg), env)
if env.Get("LOCALPOD_DEBUG") == "true" {
fmt.Printf("DEBUG: args for create: %v\n", args)
}
fmt.Printf("Creating container, pulling latest image if needed (note: no progress bars)\n")
cmd := exec.Command("docker", args...)
cmd.Stderr = stderr
out := bytes.NewBuffer([]byte{})
cmd.Stdout = out
err = cmd.Run()
if err != nil {
return c, fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
c.ID = out.String()
return c, nil
}
type containerInspect struct {
ID string `json:"Id"`
Config struct {
Env []string `json:"Env"`
} `json:"Config"`
}
func (c *Container) Exists(name string) (string, error) {
out, err := exec.Command("docker", "inspect", name).Output()
if err != nil {
return "", fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
var inspect []containerInspect
err = json.Unmarshal(out, &inspect)
if err != nil {
return "", fmt.Errorf("unmarshal failed: %w", err)
}
if len(inspect) != 1 {
return "", fmt.Errorf("unexpected number of inspect entries: %d", len(inspect))
}
expectedSHA1 := c.Config.SHA1()
inspectEnv := config.NewEnv(inspect[0].Config.Env)
inspectSHA1 := inspectEnv.Get(configSHA1EnvKey)
if inspectSHA1 != expectedSHA1 {
fmt.Printf("DEBUG: expected: %s, inspected: %s\n", expectedSHA1, inspectSHA1)
return inspect[0].ID, ErrExistsButDifferent
}
return inspect[0].ID, nil
}
var (
setupScript = `#!/bin/sh
set -e
# ensure user is created
adduser --home /home/{{.Username}} --gecos '' --disabled-password -u {{ .UID }} {{.Username}} || true
usermod --uid {{ .UID }} {{.Username}} || true
# setup user for passwordless sudo
addgroup sudo || true
addgroup {{.Username}} sudo || true
mkdir -p /etc/sudoers.d
echo "{{.Username}} ALL=(ALL) NOPASSWD:ALL" > "/etc/sudoers.d/{{.Username}}"
if command -v apk; then
apk add --no-cache sudo
fi
if command -v apt-get; then
apt-get update && apt-get install -y --no-install-recommends sudo
fi
# create dir for homebrew
mkdir -p /home/linuxbrew/.linuxbrew/Homebrew
chown -R {{.Username}} /home/linuxbrew
# fix docker socket perms
groupmod -g $(stat -c "%g" /var/run/docker.sock) docker || true
homedir=$( getent passwd "{{.Username}}" | cut -d: -f6 )
mkdir -p "${homedir}/.ssh"
chmod 0700 "${homedir}/.ssh"
if [ -d "/.ssh" ]; then
cp -R /.ssh/* "${homedir}/.ssh/"
chmod 600 "${homedir}/.ssh/id_*" || true
chmod 644 "${homedir}/.ssh/id_*.pub" || true
chmod 644 "${homedir}/.ssh/config*" || true
fi
`
startScript = `#!/bin/sh
# run the users default login shell
eval $(ssh-agent -s); ssh-add; $(awk -F: -v user="{{.Username}}" '$1 == user {print $NF}' /etc/passwd) --login
`
startCommand = "/start"
)
type TemplateScriptParams struct {
UID string
Username string
}
func (c *Container) AddScript(name string, dstPath string, templatedContent string) error {
tmpl, err := template.New(name).Parse(templatedContent)
if err != nil {
return fmt.Errorf("could not parse %s template: %w", name, err)
}
tmp := os.TempDir()
scriptPath := filepath.Join(tmp, name)
f, err := os.Create(scriptPath)
if err != nil {
return fmt.Errorf("could not create temp file")
}
defer os.Remove(f.Name())
currentUser, err := user.Current()
if err != nil {
return fmt.Errorf("could not get current user details")
}
params := TemplateScriptParams{
UID: currentUser.Uid,
Username: c.Config.RemoteUser,
}
err = tmpl.Execute(f, params)
if err != nil {
return fmt.Errorf("could not execute %s template: %w", name, err)
}
err = f.Sync()
if err != nil {
return fmt.Errorf("could not sync %s to disk: %w", name, err)
}
_, err = exec.Command("docker", "cp", f.Name(), c.Name+":"+dstPath).Output()
if err != nil {
return fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
args := []string{"chmod", "+x", dstPath}
err = c.RunCommand(args)
if err != nil {
return fmt.Errorf("could make %s executable: %w", dstPath, err)
}
return nil
}
func (c *Container) RunScript(cmd string, args ...string) error {
command := []string{cmd}
command = append(command, args...)
err := c.RunCommand(command)
if err != nil {
return fmt.Errorf("could run %s: %w", command, err)
}
return nil
}
func (c *Container) Setup() error {
fmt.Printf("DEBUG: preparing container for setup\n")
err := c.AddScript("setup.sh", "/tmp/setup.sh", setupScript)
if err != nil {
return fmt.Errorf("could not create setup.sh: %w", err)
}
err = c.AddScript("start.sh", startCommand, startScript)
if err != nil {
return fmt.Errorf("could not create %s: %w", startCommand, err)
}
fmt.Printf("DEBUG: running setup script\n")
err = c.RunScript("/tmp/setup.sh")
if err != nil {
return fmt.Errorf("failed to run setup.sh script: %w", err)
}
return nil
}
func (c *Container) RunCommand(cmd []string) error {
args := []string{"exec", "--tty", "--user", "root", "--workdir", c.Config.WorkspaceFolder, c.Name}
args = append(args, cmd...)
out, err := exec.Command("docker", args...).CombinedOutput()
if err != nil {
return fmt.Errorf("%w - %s | %s", err, err.(*exec.ExitError).Stderr, string(out))
}
return nil
}
func (c *Container) Start() error {
_, err := exec.Command("docker", "start", c.Name).Output()
if err != nil {
return fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
return nil
}
func (c *Container) Exec(env config.Env, stdin io.Reader, stdout, stderr io.Writer) error {
var args []string
args = append(args, "exec")
args = append(args, "--tty", "--interactive")
args = append(args, envToDockerArgs(c.Config.RemoteEnv)...)
args = append(args, "--user", c.Config.RemoteUser)
args = append(args, "--workdir", c.Config.WorkspaceFolder)
args = append(args, c.Name)
args = append(args, startCommand)
if env.Get("LOCALPOD_DEBUG") == "true" {
fmt.Printf("DEBUG: args for exec: %v\n", args)
}
fmt.Printf("Entering container\n")
cmd := exec.Command("docker", args...)
cmd.Stderr = stderr
cmd.Stdout = stdout
cmd.Stdin = stdin
err := cmd.Run()
if err != nil {
return fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
return nil
}
func (c *Container) Stop() error {
_, err := exec.Command("docker", "stop", c.Name).Output()
if err != nil {
return fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
return nil
}
func (c *Container) Rm() error {
_, err := exec.Command("docker", "rm", "-f", c.ID).Output()
if err != nil {
return fmt.Errorf("%w - %s", err, err.(*exec.ExitError).Stderr)
}
return nil
}