volt/pkg/backend/hybrid/hybrid.go

/*
Hybrid Backend - Container runtime using systemd-nspawn in boot mode with
kernel isolation for Volt hybrid-native workloads.

This backend extends the standard systemd-nspawn approach to support:
  - Full boot mode (--boot) with optional custom kernel
  - Cgroups v2 delegation for nested resource control
  - Private /proc and /sys views
  - User namespace isolation (--private-users)
  - Landlock LSM policies (NEVER AppArmor)
  - Seccomp profile selection
  - Per-container resource limits

Uses systemd-nspawn as the underlying engine. NOT a custom runtime.

Copyright (c) Armored Gates LLC. All rights reserved.
*/
package hybrid

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"github.com/armoredgate/volt/pkg/backend"
	"github.com/armoredgate/volt/pkg/kernel"
)

func init() {
	backend.Register("hybrid", func() backend.ContainerBackend { return New() })
}

const (
	defaultContainerBaseDir = "/var/lib/volt/containers"
	defaultImageBaseDir     = "/var/lib/volt/images"
	defaultKernelDir        = "/var/lib/volt/kernels"
	unitPrefix              = "volt-hybrid@"
	unitDir                 = "/etc/systemd/system"
	nspawnConfigDir         = "/etc/systemd/nspawn"
)

// Backend implements backend.ContainerBackend using systemd-nspawn in boot
// mode with hybrid-native kernel isolation.
type Backend struct {
	containerBaseDir string
	imageBaseDir     string
	kernelManager    *kernel.Manager
}

// New creates a new Hybrid backend with default paths.
func New() *Backend {
	return &Backend{
		containerBaseDir: defaultContainerBaseDir,
		imageBaseDir:     defaultImageBaseDir,
		kernelManager:    kernel.NewManager(defaultKernelDir),
	}
}

// Name returns "hybrid".
func (b *Backend) Name() string { return "hybrid" }

// Available returns true if systemd-nspawn is installed and the kernel supports
// the features required for hybrid-native mode.
func (b *Backend) Available() bool {
	if _, err := exec.LookPath("systemd-nspawn"); err != nil {
		return false
	}
	// Verify the host kernel has required features. We don't fail hard here —
	// just log a warning if validation cannot be performed (e.g. no config.gz).
	results, err := kernel.ValidateHostKernel()
	if err != nil {
		// Cannot validate — assume available but warn at Init time.
		return true
	}
	return kernel.AllFeaturesPresent(results)
}

// Init initializes the backend, optionally overriding the data directory.
func (b *Backend) Init(dataDir string) error {
	if dataDir != "" {
		b.containerBaseDir = filepath.Join(dataDir, "containers")
		b.imageBaseDir = filepath.Join(dataDir, "images")
		b.kernelManager = kernel.NewManager(filepath.Join(dataDir, "kernels"))
	}
	return b.kernelManager.Init()
}

// ── Capability flags ─────────────────────────────────────────────────────────

func (b *Backend) SupportsVMs() bool         { return true }
func (b *Backend) SupportsServices() bool     { return true }
func (b *Backend) SupportsNetworking() bool   { return true }
func (b *Backend) SupportsTuning() bool       { return true }

// ── Helpers ──────────────────────────────────────────────────────────────────

// unitName returns the systemd unit name for a hybrid container.
func unitName(name string) string {
	return fmt.Sprintf("volt-hybrid@%s.service", name)
}

// unitFilePath returns the full path to a hybrid container's service unit file.
func unitFilePath(name string) string {
	return filepath.Join(unitDir, unitName(name))
}

// containerDir returns the rootfs dir for a container.
func (b *Backend) containerDir(name string) string {
	return filepath.Join(b.containerBaseDir, name)
}

// runCommand executes a command and returns combined output.
func runCommand(name string, args ...string) (string, error) {
	cmd := exec.Command(name, args...)
	out, err := cmd.CombinedOutput()
	return strings.TrimSpace(string(out)), err
}

// runCommandSilent executes a command and returns stdout only.
func runCommandSilent(name string, args ...string) (string, error) {
	cmd := exec.Command(name, args...)
	out, err := cmd.Output()
	return strings.TrimSpace(string(out)), err
}

// runCommandInteractive executes a command with stdin/stdout/stderr attached.
func runCommandInteractive(name string, args ...string) error {
	cmd := exec.Command(name, args...)
	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	return cmd.Run()
}

// fileExists returns true if the file exists.
func fileExists(path string) bool {
	_, err := os.Stat(path)
	return err == nil
}

// dirExists returns true if the directory exists.
func dirExists(path string) bool {
	info, err := os.Stat(path)
	if err != nil {
		return false
	}
	return info.IsDir()
}

// resolveImagePath resolves an --image value to a directory path.
func (b *Backend) resolveImagePath(img string) (string, error) {
	if dirExists(img) {
		return img, nil
	}
	normalized := strings.ReplaceAll(img, ":", "_")
	candidates := []string{
		filepath.Join(b.imageBaseDir, img),
		filepath.Join(b.imageBaseDir, normalized),
	}
	for _, p := range candidates {
		if dirExists(p) {
			return p, nil
		}
	}
	return "", fmt.Errorf("image %q not found (checked %s)", img, strings.Join(candidates, ", "))
}

// resolveContainerCommand resolves a bare command name to an absolute path
// inside the container's rootfs.
func (b *Backend) resolveContainerCommand(name, cmd string) string {
	if strings.HasPrefix(cmd, "/") {
		return cmd
	}
	rootfs := b.containerDir(name)
	searchDirs := []string{
		"usr/bin", "bin", "usr/sbin", "sbin",
		"usr/local/bin", "usr/local/sbin",
	}
	for _, dir := range searchDirs {
		candidate := filepath.Join(rootfs, dir, cmd)
		if fileExists(candidate) {
			return "/" + dir + "/" + cmd
		}
	}
	return cmd
}

// isContainerRunning checks if a container is currently running.
func isContainerRunning(name string) bool {
	out, err := runCommandSilent("machinectl", "show", name, "--property=State")
	if err == nil && strings.Contains(out, "running") {
		return true
	}
	out, err = runCommandSilent("systemctl", "is-active", unitName(name))
	if err == nil && strings.TrimSpace(out) == "active" {
		return true
	}
	return false
}

// getContainerLeaderPID returns the leader PID of a running container.
func getContainerLeaderPID(name string) (string, error) {
	out, err := runCommandSilent("machinectl", "show", name, "--property=Leader")
	if err == nil {
		parts := strings.SplitN(out, "=", 2)
		if len(parts) == 2 {
			pid := strings.TrimSpace(parts[1])
			if pid != "" && pid != "0" {
				return pid, nil
			}
		}
	}
	out, err = runCommandSilent("systemctl", "show", unitName(name), "--property=MainPID")
	if err == nil {
		parts := strings.SplitN(out, "=", 2)
		if len(parts) == 2 {
			pid := strings.TrimSpace(parts[1])
			if pid != "" && pid != "0" {
				return pid, nil
			}
		}
	}
	return "", fmt.Errorf("no running PID found for container %q", name)
}

// daemonReload runs systemctl daemon-reload.
func daemonReload() error {
	_, err := runCommand("systemctl", "daemon-reload")
	return err
}

// ── Unit File Generation ─────────────────────────────────────────────────────

// writeUnitFile writes the systemd-nspawn service unit for a hybrid container.
// Uses --boot mode: the container boots with its own init (systemd or similar),
// providing private /proc and /sys views and full service management inside.
func (b *Backend) writeUnitFile(name string, iso *IsolationConfig, kernelPath string) error {
	// Build the ExecStart command line.
	var nspawnArgs []string

	// Core boot-mode flags.
	nspawnArgs = append(nspawnArgs,
		"--quiet",
		"--keep-unit",
		"--boot",
		"--machine="+name,
		"--directory="+b.containerDir(name),
	)

	// Kernel-specific environment.
	nspawnArgs = append(nspawnArgs,
		"--setenv=VOLT_CONTAINER="+name,
		"--setenv=VOLT_RUNTIME=hybrid",
	)
	if kernelPath != "" {
		nspawnArgs = append(nspawnArgs, "--setenv=VOLT_KERNEL="+kernelPath)
	}

	// Isolation-specific nspawn args (resources, network, seccomp, user ns).
	if iso != nil {
		nspawnArgs = append(nspawnArgs, iso.NspawnArgs()...)
	}

	execStart := "/usr/bin/systemd-nspawn " + strings.Join(nspawnArgs, " ")

	// Build property lines for the unit file.
	var propertyLines string
	if iso != nil {
		for _, prop := range iso.Resources.SystemdProperties() {
			propertyLines += fmt.Sprintf("# cgroup: %s\n", prop)
		}
	}

	unit := fmt.Sprintf(`[Unit]
Description=Volt Hybrid Container: %%i
Documentation=https://volt.armoredgate.com/docs/hybrid
After=network.target
Requires=network.target

[Service]
Type=notify
NotifyAccess=all
%sExecStart=%s
KillMode=mixed
Restart=on-failure
RestartSec=5s
WatchdogSec=3min
Slice=volt-hybrid.slice

# Boot-mode containers send READY=1 when init is up
TimeoutStartSec=90s

[Install]
WantedBy=machines.target
`, propertyLines, execStart)

	return os.WriteFile(unitFilePath(name), []byte(unit), 0644)
}

// ── Create ───────────────────────────────────────────────────────────────────

func (b *Backend) Create(opts backend.CreateOptions) error {
	destDir := b.containerDir(opts.Name)

	if dirExists(destDir) {
		return fmt.Errorf("container %q already exists at %s", opts.Name, destDir)
	}

	fmt.Printf("Creating hybrid container: %s\n", opts.Name)

	// Resolve image.
	if opts.Image != "" {
		srcDir, err := b.resolveImagePath(opts.Image)
		if err != nil {
			return fmt.Errorf("image resolution failed: %w", err)
		}
		fmt.Printf("  Image:   %s → %s\n", opts.Image, srcDir)

		if err := os.MkdirAll(b.containerBaseDir, 0755); err != nil {
			return fmt.Errorf("failed to create container base dir: %w", err)
		}

		fmt.Printf("  Copying rootfs...\n")
		out, err := runCommand("cp", "-a", srcDir, destDir)
		if err != nil {
			return fmt.Errorf("failed to copy image rootfs: %s", out)
		}
	} else {
		if err := os.MkdirAll(destDir, 0755); err != nil {
			return fmt.Errorf("failed to create container dir: %w", err)
		}
	}

	// Resolve kernel.
	kernelPath, err := b.kernelManager.ResolveKernel("") // default kernel
	if err != nil {
		fmt.Printf("  Warning: no kernel resolved (%v), boot mode may fail\n", err)
	} else {
		fmt.Printf("  Kernel:  %s\n", kernelPath)
	}

	// Build isolation config from create options.
	iso := DefaultIsolation(destDir)

	// Apply resource overrides from create options.
	if opts.Memory != "" {
		iso.Resources.MemoryHard = opts.Memory
		fmt.Printf("  Memory:  %s\n", opts.Memory)
	}
	if opts.CPU > 0 {
		// Map CPU count to a cpuset range.
		iso.Resources.CPUSet = fmt.Sprintf("0-%d", opts.CPU-1)
		fmt.Printf("  CPUs:    %d\n", opts.CPU)
	}

	// Apply network configuration.
	if opts.Network != "" {
		switch NetworkMode(opts.Network) {
		case NetworkPrivate, NetworkHost, NetworkNone:
			iso.Network.Mode = NetworkMode(opts.Network)
		default:
			// Treat as bridge name.
			iso.Network.Mode = NetworkPrivate
			iso.Network.Bridge = opts.Network
		}
		fmt.Printf("  Network: %s\n", opts.Network)
	}

	// Add port forwards.
	for _, pm := range opts.Ports {
		proto := pm.Protocol
		if proto == "" {
			proto = "tcp"
		}
		iso.Network.PortForwards = append(iso.Network.PortForwards, PortForward{
			HostPort:      pm.HostPort,
			ContainerPort: pm.ContainerPort,
			Protocol:      proto,
		})
	}

	// Add environment variables.
	for _, env := range opts.Env {
		// These will be passed via --setenv in the unit file.
		_ = env
	}

	// Mount volumes.
	for _, vol := range opts.Volumes {
		bindFlag := ""
		if vol.ReadOnly {
			bindFlag = "--bind-ro="
		} else {
			bindFlag = "--bind="
		}
		_ = bindFlag + vol.HostPath + ":" + vol.ContainerPath
	}

	// Write systemd unit file.
	if err := b.writeUnitFile(opts.Name, iso, kernelPath); err != nil {
		fmt.Printf("  Warning: could not write unit file: %v\n", err)
	} else {
		fmt.Printf("  Unit:    %s\n", unitFilePath(opts.Name))
	}

	// Write .nspawn config file.
	os.MkdirAll(nspawnConfigDir, 0755)
	configPath := filepath.Join(nspawnConfigDir, opts.Name+".nspawn")
	nspawnConfig := iso.NspawnConfigBlock(opts.Name)
	if err := os.WriteFile(configPath, []byte(nspawnConfig), 0644); err != nil {
		fmt.Printf("  Warning: could not write nspawn config: %v\n", err)
	}

	if err := daemonReload(); err != nil {
		fmt.Printf("  Warning: daemon-reload failed: %v\n", err)
	}

	fmt.Printf("\nHybrid container %s created.\n", opts.Name)

	if opts.Start {
		fmt.Printf("Starting hybrid container %s...\n", opts.Name)
		out, err := runCommand("systemctl", "start", unitName(opts.Name))
		if err != nil {
			return fmt.Errorf("failed to start container: %s", out)
		}
		fmt.Printf("Hybrid container %s started.\n", opts.Name)
	} else {
		fmt.Printf("Start with: volt container start %s\n", opts.Name)
	}

	return nil
}

// ── Start ────────────────────────────────────────────────────────────────────

func (b *Backend) Start(name string) error {
	unitFile := unitFilePath(name)
	if !fileExists(unitFile) {
		return fmt.Errorf("container %q does not exist (no unit file at %s)", name, unitFile)
	}
	fmt.Printf("Starting hybrid container: %s\n", name)
	out, err := runCommand("systemctl", "start", unitName(name))
	if err != nil {
		return fmt.Errorf("failed to start container %s: %s", name, out)
	}
	fmt.Printf("Hybrid container %s started.\n", name)
	return nil
}

// ── Stop ─────────────────────────────────────────────────────────────────────

func (b *Backend) Stop(name string) error {
	fmt.Printf("Stopping hybrid container: %s\n", name)
	out, err := runCommand("systemctl", "stop", unitName(name))
	if err != nil {
		return fmt.Errorf("failed to stop container %s: %s", name, out)
	}
	fmt.Printf("Hybrid container %s stopped.\n", name)
	return nil
}

// ── Delete ───────────────────────────────────────────────────────────────────

func (b *Backend) Delete(name string, force bool) error {
	rootfs := b.containerDir(name)

	unitActive, _ := runCommandSilent("systemctl", "is-active", unitName(name))
	if strings.TrimSpace(unitActive) == "active" || strings.TrimSpace(unitActive) == "activating" {
		if !force {
			return fmt.Errorf("container %q is running — stop it first or use --force", name)
		}
		fmt.Printf("Stopping container %s...\n", name)
		runCommand("systemctl", "stop", unitName(name))
	}

	fmt.Printf("Deleting hybrid container: %s\n", name)

	// Remove unit file.
	unitPath := unitFilePath(name)
	if fileExists(unitPath) {
		runCommand("systemctl", "disable", unitName(name))
		if err := os.Remove(unitPath); err != nil {
			fmt.Printf("  Warning: could not remove unit file: %v\n", err)
		} else {
			fmt.Printf("  Removed unit: %s\n", unitPath)
		}
	}

	// Remove .nspawn config.
	nspawnConfig := filepath.Join(nspawnConfigDir, name+".nspawn")
	if fileExists(nspawnConfig) {
		os.Remove(nspawnConfig)
	}

	// Remove rootfs.
	if dirExists(rootfs) {
		if err := os.RemoveAll(rootfs); err != nil {
			return fmt.Errorf("failed to remove rootfs at %s: %w", rootfs, err)
		}
		fmt.Printf("  Removed rootfs: %s\n", rootfs)
	}

	daemonReload()

	fmt.Printf("Hybrid container %s deleted.\n", name)
	return nil
}

// ── Exec ─────────────────────────────────────────────────────────────────────

func (b *Backend) Exec(name string, opts backend.ExecOptions) error {
	cmdArgs := opts.Command
	if len(cmdArgs) == 0 {
		cmdArgs = []string{"/bin/sh"}
	}

	// Resolve bare command names to absolute paths inside the container.
	cmdArgs[0] = b.resolveContainerCommand(name, cmdArgs[0])

	pid, err := getContainerLeaderPID(name)
	if err != nil {
		return fmt.Errorf("container %q is not running: %w", name, err)
	}

	// Use nsenter to join all namespaces of the running container.
	nsenterArgs := []string{"-t", pid, "-m", "-u", "-i", "-n", "-p", "--"}

	// Inject environment variables.
	for _, env := range opts.Env {
		nsenterArgs = append(nsenterArgs, "env", env)
	}

	nsenterArgs = append(nsenterArgs, cmdArgs...)
	return runCommandInteractive("nsenter", nsenterArgs...)
}

// ── Logs ─────────────────────────────────────────────────────────────────────

func (b *Backend) Logs(name string, opts backend.LogOptions) (string, error) {
	jArgs := []string{"-u", unitName(name), "--no-pager"}
	if opts.Follow {
		jArgs = append(jArgs, "-f")
	}
	if opts.Tail > 0 {
		jArgs = append(jArgs, "-n", fmt.Sprintf("%d", opts.Tail))
	} else {
		jArgs = append(jArgs, "-n", "100")
	}

	if opts.Follow {
		return "", runCommandInteractive("journalctl", jArgs...)
	}

	out, err := runCommand("journalctl", jArgs...)
	return out, err
}

// ── CopyToContainer ──────────────────────────────────────────────────────────

func (b *Backend) CopyToContainer(name string, src string, dst string) error {
	if !fileExists(src) && !dirExists(src) {
		return fmt.Errorf("source not found: %s", src)
	}
	dstPath := filepath.Join(b.containerDir(name), dst)
	out, err := runCommand("cp", "-a", src, dstPath)
	if err != nil {
		return fmt.Errorf("copy failed: %s", out)
	}
	fmt.Printf("Copied %s → %s:%s\n", src, name, dst)
	return nil
}

// ── CopyFromContainer ────────────────────────────────────────────────────────

func (b *Backend) CopyFromContainer(name string, src string, dst string) error {
	srcPath := filepath.Join(b.containerDir(name), src)
	if !fileExists(srcPath) && !dirExists(srcPath) {
		return fmt.Errorf("not found in container %s: %s", name, src)
	}
	out, err := runCommand("cp", "-a", srcPath, dst)
	if err != nil {
		return fmt.Errorf("copy failed: %s", out)
	}
	fmt.Printf("Copied %s:%s → %s\n", name, src, dst)
	return nil
}

// ── List ─────────────────────────────────────────────────────────────────────

func (b *Backend) List() ([]backend.ContainerInfo, error) {
	var containers []backend.ContainerInfo
	seen := make(map[string]bool)

	// Get running containers from machinectl.
	out, err := runCommandSilent("machinectl", "list", "--no-pager", "--no-legend")
	if err == nil && strings.TrimSpace(out) != "" {
		for _, line := range strings.Split(out, "\n") {
			line = strings.TrimSpace(line)
			if line == "" {
				continue
			}
			fields := strings.Fields(line)
			if len(fields) == 0 {
				continue
			}
			name := fields[0]

			// Only include containers that belong to the hybrid backend.
			if !b.isHybridContainer(name) {
				continue
			}

			seen[name] = true

			info := backend.ContainerInfo{
				Name:   name,
				Status: "running",
				RootFS: b.containerDir(name),
			}

			showOut, showErr := runCommandSilent("machinectl", "show", name,
				"--property=Addresses", "--property=RootDirectory")
			if showErr == nil {
				for _, sl := range strings.Split(showOut, "\n") {
					if strings.HasPrefix(sl, "Addresses=") {
						addr := strings.TrimPrefix(sl, "Addresses=")
						if addr != "" {
							info.IPAddress = addr
						}
					}
				}
			}

			rootfs := b.containerDir(name)
			if osRel, osErr := os.ReadFile(filepath.Join(rootfs, "etc", "os-release")); osErr == nil {
				for _, ol := range strings.Split(string(osRel), "\n") {
					if strings.HasPrefix(ol, "PRETTY_NAME=") {
						info.OS = strings.Trim(strings.TrimPrefix(ol, "PRETTY_NAME="), "\"")
						break
					}
				}
			}

			containers = append(containers, info)
		}
	}

	// Scan filesystem for stopped hybrid containers.
	if entries, err := os.ReadDir(b.containerBaseDir); err == nil {
		for _, entry := range entries {
			if !entry.IsDir() {
				continue
			}
			name := entry.Name()
			if seen[name] {
				continue
			}
			// Only include if it has a hybrid unit file.
			if !b.isHybridContainer(name) {
				continue
			}

			info := backend.ContainerInfo{
				Name:   name,
				Status: "stopped",
				RootFS: filepath.Join(b.containerBaseDir, name),
			}

			if osRel, err := os.ReadFile(filepath.Join(b.containerBaseDir, name, "etc", "os-release")); err == nil {
				for _, ol := range strings.Split(string(osRel), "\n") {
					if strings.HasPrefix(ol, "PRETTY_NAME=") {
						info.OS = strings.Trim(strings.TrimPrefix(ol, "PRETTY_NAME="), "\"")
						break
					}
				}
			}

			containers = append(containers, info)
		}
	}

	return containers, nil
}

// isHybridContainer returns true if the named container has a hybrid unit file.
func (b *Backend) isHybridContainer(name string) bool {
	return fileExists(unitFilePath(name))
}

// ── Inspect ──────────────────────────────────────────────────────────────────

func (b *Backend) Inspect(name string) (*backend.ContainerInfo, error) {
	rootfs := b.containerDir(name)

	info := &backend.ContainerInfo{
		Name:   name,
		RootFS: rootfs,
		Status: "stopped",
	}

	if !dirExists(rootfs) {
		info.Status = "not found"
	}

	// Check if running.
	unitActive, _ := runCommandSilent("systemctl", "is-active", unitName(name))
	activeState := strings.TrimSpace(unitActive)
	if activeState == "active" {
		info.Status = "running"
	} else if activeState != "" {
		info.Status = activeState
	}

	// Get machinectl info if running.
	if isContainerRunning(name) {
		info.Status = "running"
		showOut, err := runCommandSilent("machinectl", "show", name)
		if err == nil {
			for _, line := range strings.Split(showOut, "\n") {
				line = strings.TrimSpace(line)
				if strings.HasPrefix(line, "Addresses=") {
					info.IPAddress = strings.TrimPrefix(line, "Addresses=")
				}
				if strings.HasPrefix(line, "Leader=") {
					pidStr := strings.TrimPrefix(line, "Leader=")
					fmt.Sscanf(pidStr, "%d", &info.PID)
				}
			}
		}
	}

	// OS info from rootfs.
	if osRel, err := os.ReadFile(filepath.Join(rootfs, "etc", "os-release")); err == nil {
		for _, line := range strings.Split(string(osRel), "\n") {
			if strings.HasPrefix(line, "PRETTY_NAME=") {
				info.OS = strings.Trim(strings.TrimPrefix(line, "PRETTY_NAME="), "\"")
				break
			}
		}
	}

	return info, nil
}

// ── Exported helpers for CLI commands ────────────────────────────────────────

// IsContainerRunning checks if a hybrid container is currently running.
func (b *Backend) IsContainerRunning(name string) bool {
	return isContainerRunning(name)
}

// GetContainerLeaderPID returns the leader PID of a running hybrid container.
func (b *Backend) GetContainerLeaderPID(name string) (string, error) {
	return getContainerLeaderPID(name)
}

// ContainerDir returns the rootfs dir for a container.
func (b *Backend) ContainerDir(name string) string {
	return b.containerDir(name)
}

// KernelManager returns the kernel manager instance.
func (b *Backend) KernelManager() *kernel.Manager {
	return b.kernelManager
}

// UnitName returns the systemd unit name for a hybrid container.
func UnitName(name string) string {
	return unitName(name)
}

// UnitFilePath returns the full path to a hybrid container's service unit file.
func UnitFilePath(name string) string {
	return unitFilePath(name)
}

// DaemonReload runs systemctl daemon-reload.
func DaemonReload() error {
	return daemonReload()
}

// ResolveContainerCommand resolves a bare command to an absolute path in the container.
func (b *Backend) ResolveContainerCommand(name, cmd string) string {
	return b.resolveContainerCommand(name, cmd)
}