Add chroot disk build

builder/hyperone/builder.go

@@ -8,6 +8,7 @@ import (
 	"github.com/hashicorp/packer/helper/communicator"
 	"github.com/hashicorp/packer/helper/multistep"
 	"github.com/hashicorp/packer/packer"
+	"github.com/hashicorp/packer/template/interpolate"
 	"github.com/hyperonecom/h1-client-go"
 )
 
@@ -41,12 +42,23 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 	return nil, nil
 }
 
+type wrappedCommandTemplate struct {
+	Command string
+}
+
 func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
+	wrappedCommand := func(command string) (string, error) {
+		ctx := b.config.ctx
+		ctx.Data = &wrappedCommandTemplate{Command: command}
+		return interpolate.Render(b.config.ChrootCommandWrapper, &ctx)
+	}
+
 	state := &multistep.BasicStateBag{}
 	state.Put("config", &b.config)
 	state.Put("client", b.client)
 	state.Put("hook", hook)
 	state.Put("ui", ui)
+	state.Put("wrappedCommand", CommandWrapper(wrappedCommand))
 
 	steps := []multistep.Step{
 		&stepCreateSSHKey{},
@@ -56,9 +68,28 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 			Host:      getPublicIP,
 			SSHConfig: b.config.Comm.SSHConfigFunc(),
 		},
-		&common.StepProvision{},
-		&stepStopVM{},
-		&stepCreateImage{},
+	}
+
+	if b.config.ChrootDisk {
+		steps = append(steps,
+			&stepPrepareDevice{},
+			&stepPreMountCommands{},
+			&stepMountChroot{},
+			&stepPostMountCommands{},
+			&stepMountExtra{},
+			&stepCopyFiles{},
+			&stepChrootProvision{},
+			&stepStopVM{},
+			&stepDetachDisk{},
+			&stepCreateVMFromDisk{},
+			&stepCreateImage{},
+		)
+	} else {
+		steps = append(steps,
+			&common.StepProvision{},
+			&stepStopVM{},
+			&stepCreateImage{},
+		)
 	}
 
 	b.runner = common.NewRunner(steps, b.config.PackerConfig, ui)

builder/hyperone/chroot_communicator.go

@@ -0,0 +1,54 @@
+package hyperone
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	"github.com/hashicorp/packer/packer"
+)
+
+type CommandWrapper func(string) (string, error)
+
+// ChrootCommunicator works as a wrapper on SSHCommunicator, modyfing paths in
+// flight to be run in a chroot.
+type ChrootCommunicator struct {
+	Chroot     string
+	CmdWrapper CommandWrapper
+	Wrapped    packer.Communicator
+}
+
+func (c *ChrootCommunicator) Start(cmd *packer.RemoteCmd) error {
+	command := strconv.Quote(cmd.Command)
+	chrootCommand, err := c.CmdWrapper(
+		fmt.Sprintf("sudo chroot %s /bin/sh -c %s", c.Chroot, command))
+	if err != nil {
+		return err
+	}
+
+	cmd.Command = chrootCommand
+
+	return c.Wrapped.Start(cmd)
+}
+
+func (c *ChrootCommunicator) Upload(dst string, r io.Reader, fi *os.FileInfo) error {
+	dst = filepath.Join(c.Chroot, dst)
+	return c.Wrapped.Upload(dst, r, fi)
+}
+
+func (c *ChrootCommunicator) UploadDir(dst string, src string, exclude []string) error {
+	dst = filepath.Join(c.Chroot, dst)
+	return c.Wrapped.UploadDir(dst, src, exclude)
+}
+
+func (c *ChrootCommunicator) Download(src string, w io.Writer) error {
+	src = filepath.Join(c.Chroot, src)
+	return c.Wrapped.Download(src, w)
+}
+
+func (c *ChrootCommunicator) DownloadDir(src string, dst string, exclude []string) error {
+	src = filepath.Join(c.Chroot, src)
+	return c.Wrapped.DownloadDir(src, dst, exclude)
+}

builder/hyperone/config.go

@@ -57,6 +57,19 @@ type Config struct {
 	PrivateIP string `mapstructure:"private_ip"`
 	PublicIP  string `mapstructure:"public_ip"`
 
+	ChrootDisk           bool       `mapstructure:"chroot_disk"`
+	ChrootDiskSize       float32    `mapstructure:"chroot_disk_size"`
+	ChrootDiskType       string     `mapstructure:"chroot_disk_type"`
+	ChrootMountPath      string     `mapstructure:"chroot_mount_path"`
+	ChrootMounts         [][]string `mapstructure:"chroot_mounts"`
+	ChrootCopyFiles      []string   `mapstructure:"chroot_copy_files"`
+	ChrootCommandWrapper string     `mapstructure:"chroot_command_wrapper"`
+
+	MountOptions      []string `mapstructure:"mount_options"`
+	MountPartition    string   `mapstructure:"mount_partition"`
+	PreMountCommands  []string `mapstructure:"pre_mount_commands"`
+	PostMountCommands []string `mapstructure:"post_mount_commands"`
+
 	SSHKeys  []string `mapstructure:"ssh_keys"`
 	UserData string   `mapstructure:"user_data"`
 
@@ -74,6 +87,10 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 		InterpolateFilter: &interpolate.RenderFilter{
 			Exclude: []string{
 				"run_command",
+				"chroot_command_wrapper",
+				"post_mount_commands",
+				"pre_mount_commands",
+				"mount_path",
 			},
 		},
 	}, raws...)
@@ -138,6 +155,45 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 		c.DiskType = defaultDiskType
 	}
 
+	if c.ChrootCommandWrapper == "" {
+		c.ChrootCommandWrapper = "{{.Command}}"
+	}
+
+	if c.ChrootDiskSize == 0 {
+		c.ChrootDiskSize = c.DiskSize
+	}
+
+	if c.ChrootDiskType == "" {
+		c.ChrootDiskType = c.DiskType
+	}
+
+	if c.ChrootMountPath == "" {
+		c.ChrootMountPath = "/mnt/packer-hyperone-volumes/{{timestamp}}"
+	}
+
+	if c.ChrootMounts == nil {
+		c.ChrootMounts = make([][]string, 0)
+	}
+
+	if len(c.ChrootMounts) == 0 {
+		c.ChrootMounts = [][]string{
+			{"proc", "proc", "/proc"},
+			{"sysfs", "sysfs", "/sys"},
+			{"bind", "/dev", "/dev"},
+			{"devpts", "devpts", "/dev/pts"},
+			{"binfmt_misc", "binfmt_misc", "/proc/sys/fs/binfmt_misc"},
+		}
+	}
+
+	if c.ChrootCopyFiles == nil {
+		c.ChrootCopyFiles = []string{"/etc/resolv.conf"}
+	}
+
+	if c.MountPartition == "" {
+		c.MountPartition = "1"
+	}
+
+	// Validation
 	var errs *packer.MultiError
 	if es := c.Comm.Prepare(&c.ctx); len(es) > 0 {
 		errs = packer.MultiErrorAppend(errs, es...)
@@ -159,6 +215,20 @@ func NewConfig(raws ...interface{}) (*Config, []string, error) {
 		errs = packer.MultiErrorAppend(errs, errors.New("source image is required"))
 	}
 
+	if c.ChrootDisk {
+		if len(c.PreMountCommands) == 0 {
+			errs = packer.MultiErrorAppend(errs, errors.New("pre-mount commands are required for chroot disk"))
+		}
+	}
+
+	for _, mounts := range c.ChrootMounts {
+		if len(mounts) != 3 {
+			errs = packer.MultiErrorAppend(
+				errs, errors.New("each chroot_mounts entry should have three elements"))
+			break
+		}
+	}
+
 	if errs != nil && len(errs.Errors) > 0 {
 		return nil, nil, errs
 	}

builder/hyperone/step_chroot_provision.go

@@ -0,0 +1,28 @@
+package hyperone
+
+import (
+	"context"
+
+	"github.com/hashicorp/packer/common"
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type stepChrootProvision struct{}
+
+func (s *stepChrootProvision) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
+	config := state.Get("config").(*Config)
+	wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
+	sshCommunicator := state.Get("communicator").(packer.Communicator)
+
+	comm := &ChrootCommunicator{
+		Chroot:     config.ChrootMountPath,
+		CmdWrapper: wrappedCommand,
+		Wrapped:    sshCommunicator,
+	}
+
+	stepProvision := common.StepProvision{Comm: comm}
+	return stepProvision.Run(ctx, state)
+}
+
+func (s *stepChrootProvision) Cleanup(multistep.StateBag) {}

builder/hyperone/step_copy_files.go

@@ -0,0 +1,40 @@
+package hyperone
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"path/filepath"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type stepCopyFiles struct{}
+
+func (s *stepCopyFiles) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	config := state.Get("config").(*Config)
+	ui := state.Get("ui").(packer.Ui)
+
+	if len(config.ChrootCopyFiles) == 0 {
+		return multistep.ActionContinue
+	}
+
+	ui.Say("Copying files from host to chroot...")
+	for _, path := range config.ChrootCopyFiles {
+		chrootPath := filepath.Join(config.ChrootMountPath, path)
+		log.Printf("Copying '%s' to '%s'", path, chrootPath)
+
+		command := fmt.Sprintf("cp --remove-destination %s %s", path, chrootPath)
+		err := runCommands([]string{command}, config.ctx, state)
+		if err != nil {
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+	}
+
+	return multistep.ActionContinue
+}
+
+func (s *stepCopyFiles) Cleanup(state multistep.StateBag) {}

builder/hyperone/step_create_vm.go

@@ -13,6 +13,10 @@ type stepCreateVM struct {
 	vmID string
 }
 
+const (
+	chrootDiskName = "packer-chroot-disk"
+)
+
 func (s *stepCreateVM) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
 	client := state.Get("client").(*openapi.APIClient)
 	ui := state.Get("ui").(packer.Ui)
@@ -26,17 +30,27 @@ func (s *stepCreateVM) Run(ctx context.Context, state multistep.StateBag) multis
 	var sshKeys = []string{sshKey}
 	sshKeys = append(sshKeys, config.SSHKeys...)
 
-	options := openapi.VmCreate{
-		Name:    config.VmName,
-		Image:   config.SourceImage,
-		Service: config.VmFlavour,
-		SshKeys: sshKeys,
-		Disk: []openapi.VmCreateDisk{
-			{
-				Service: config.DiskType,
-				Size:    config.DiskSize,
-			},
+	disks := []openapi.VmCreateDisk{
+		{
+			Service: config.DiskType,
+			Size:    config.DiskSize,
 		},
+	}
+
+	if config.ChrootDisk {
+		disks = append(disks, openapi.VmCreateDisk{
+			Service: config.ChrootDiskType,
+			Size:    config.ChrootDiskSize,
+			Name:    chrootDiskName,
+		})
+	}
+
+	options := openapi.VmCreate{
+		Name:         config.VmName,
+		Image:        config.SourceImage,
+		Service:      config.VmFlavour,
+		SshKeys:      sshKeys,
+		Disk:         disks,
 		Netadp:       []openapi.VmCreateNetadp{netAdapter},
 		UserMetadata: config.UserData,
 		Tag:          config.VmTags,
@@ -63,7 +77,11 @@ func (s *stepCreateVM) Run(ctx context.Context, state multistep.StateBag) multis
 
 	var diskIDs []string
 	for _, hdd := range hdds {
-		diskIDs = append(diskIDs, hdd.Disk.Id)
+		if hdd.Disk.Name == chrootDiskName {
+			state.Put("chroot_disk_id", hdd.Disk.Id)
+		} else {
+			diskIDs = append(diskIDs, hdd.Disk.Id)
+		}
 	}
 
 	state.Put("disk_ids", diskIDs)

builder/hyperone/step_create_vm_from_disk.go

@@ -0,0 +1,70 @@
+package hyperone
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+	"github.com/hyperonecom/h1-client-go"
+)
+
+type stepCreateVMFromDisk struct {
+	vmID string
+}
+
+func (s *stepCreateVMFromDisk) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
+	client := state.Get("client").(*openapi.APIClient)
+	ui := state.Get("ui").(packer.Ui)
+	config := state.Get("config").(*Config)
+	sshKey := state.Get("ssh_public_key").(string)
+	chrootDiskID := state.Get("chroot_disk_id").(string)
+
+	ui.Say("Creating VM from disk...")
+
+	options := openapi.VmCreate{
+		Name:    config.VmName,
+		Service: config.VmFlavour,
+		Disk: []openapi.VmCreateDisk{
+			{
+				Id: chrootDiskID,
+			},
+		},
+		SshKeys: []string{sshKey},
+		Boot:    false,
+	}
+
+	vm, _, err := client.VmApi.VmCreate(ctx, options)
+	if err != nil {
+		err := fmt.Errorf("error creating VM from disk: %s", formatOpenAPIError(err))
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	s.vmID = vm.Id
+	state.Put("vm_id", vm.Id)
+
+	return multistep.ActionContinue
+}
+
+func (s *stepCreateVMFromDisk) Cleanup(state multistep.StateBag) {
+	if s.vmID == "" {
+		return
+	}
+
+	client := state.Get("client").(*openapi.APIClient)
+	ui := state.Get("ui").(packer.Ui)
+	chrootDiskID := state.Get("chroot_disk_id").(string)
+
+	ui.Say("Deleting VM (from disk)...")
+
+	deleteOptions := openapi.VmDelete{
+		RemoveDisks: []string{chrootDiskID},
+	}
+
+	_, err := client.VmApi.VmDelete(context.TODO(), s.vmID, deleteOptions)
+	if err != nil {
+		ui.Error(fmt.Sprintf("Error deleting server '%s' - please delete it manually: %s", s.vmID, formatOpenAPIError(err)))
+	}
+}

builder/hyperone/step_detach_disk.go

@@ -0,0 +1,34 @@
+package hyperone
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+	"github.com/hyperonecom/h1-client-go"
+)
+
+type stepDetachDisk struct {
+	vmID string
+}
+
+func (s *stepDetachDisk) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
+	client := state.Get("client").(*openapi.APIClient)
+	ui := state.Get("ui").(packer.Ui)
+	vmID := state.Get("vm_id").(string)
+	chrootDiskID := state.Get("chroot_disk_id").(string)
+
+	ui.Say("Detaching chroot disk...")
+	_, _, err := client.VmApi.VmDeleteHddDiskId(ctx, vmID, chrootDiskID)
+	if err != nil {
+		err := fmt.Errorf("error detaching disk: %s", formatOpenAPIError(err))
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	return multistep.ActionContinue
+}
+
+func (s *stepDetachDisk) Cleanup(state multistep.StateBag) {}

builder/hyperone/step_mount_chroot.go

@@ -0,0 +1,51 @@
+package hyperone
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type stepMountChroot struct{}
+
+func (s *stepMountChroot) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
+	config := state.Get("config").(*Config)
+	ui := state.Get("ui").(packer.Ui)
+	device := state.Get("device").(string)
+
+	log.Printf("Mount path: %s", config.ChrootMountPath)
+
+	ui.Say(fmt.Sprintf("Creating mount directory: %s", config.ChrootMountPath))
+
+	opts := ""
+	if len(config.MountOptions) > 0 {
+		opts = "-o " + strings.Join(config.MountOptions, " -o ")
+	}
+
+	deviceMount := device
+	if config.MountPartition != "" {
+		deviceMount = fmt.Sprintf("%s%s", device, config.MountPartition)
+	}
+
+	commands := []string{
+		fmt.Sprintf("mkdir -m 755 -p %s", config.ChrootMountPath),
+		fmt.Sprintf("mount %s %s %s", opts, deviceMount, config.ChrootMountPath),
+	}
+
+	err := runCommands(commands, config.ctx, state)
+	if err != nil {
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	state.Put("mount_path", config.ChrootMountPath)
+
+	return multistep.ActionContinue
+}
+
+func (s *stepMountChroot) Cleanup(state multistep.StateBag) {}

builder/hyperone/step_mount_extra.go

@@ -0,0 +1,45 @@
+package hyperone
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type stepMountExtra struct{}
+
+func (s *stepMountExtra) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	config := state.Get("config").(*Config)
+	mountPath := state.Get("mount_path").(string)
+	ui := state.Get("ui").(packer.Ui)
+
+	ui.Say("Mounting additional paths within the chroot...")
+	for _, mountInfo := range config.ChrootMounts {
+		innerPath := mountPath + mountInfo[2]
+
+		flags := "-t " + mountInfo[0]
+		if mountInfo[0] == "bind" {
+			flags = "--bind"
+		}
+
+		ui.Message(fmt.Sprintf("Mounting: %s", mountInfo[2]))
+
+		commands := []string{
+			fmt.Sprintf("mkdir -m 755 -p %s", innerPath),
+			fmt.Sprintf("mount %s %s %s", flags, mountInfo[1], innerPath),
+		}
+
+		err := runCommands(commands, config.ctx, state)
+		if err != nil {
+			state.Put("error", err)
+			ui.Error(err.Error())
+			return multistep.ActionHalt
+		}
+	}
+
+	return multistep.ActionContinue
+}
+
+func (s *stepMountExtra) Cleanup(state multistep.StateBag) {}

builder/hyperone/step_post_mount_commands.go

@@ -0,0 +1,37 @@
+package hyperone
+
+import (
+	"context"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type postMountCommandsData struct {
+	Device    string
+	MountPath string
+}
+
+type stepPostMountCommands struct{}
+
+func (s *stepPostMountCommands) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	config := state.Get("config").(*Config)
+	ui := state.Get("ui").(packer.Ui)
+	device := state.Get("device").(string)
+
+	ctx := config.ctx
+	ctx.Data = &postMountCommandsData{
+		Device:    device,
+		MountPath: config.ChrootMountPath,
+	}
+
+	ui.Say("Running post-mount commands...")
+	if err := runCommands(config.PostMountCommands, ctx, state); err != nil {
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+	return multistep.ActionContinue
+}
+
+func (s *stepPostMountCommands) Cleanup(state multistep.StateBag) {}

builder/hyperone/step_pre_mount_commands.go

@@ -0,0 +1,37 @@
+package hyperone
+
+import (
+	"context"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type preMountCommandsData struct {
+	Device    string
+	MountPath string
+}
+
+type stepPreMountCommands struct{}
+
+func (s *stepPreMountCommands) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	config := state.Get("config").(*Config)
+	ui := state.Get("ui").(packer.Ui)
+	device := state.Get("device").(string)
+
+	ctx := config.ctx
+	ctx.Data = &preMountCommandsData{
+		Device:    device,
+		MountPath: config.ChrootMountPath,
+	}
+
+	ui.Say("Running pre-mount commands...")
+	if err := runCommands(config.PreMountCommands, ctx, state); err != nil {
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+	return multistep.ActionContinue
+}
+
+func (s *stepPreMountCommands) Cleanup(state multistep.StateBag) {}

builder/hyperone/step_prepare_device.go

@@ -0,0 +1,46 @@
+package hyperone
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type stepPrepareDevice struct{}
+
+func (s *stepPrepareDevice) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	ui := state.Get("ui").(packer.Ui)
+	chrootDiskID := state.Get("chroot_disk_id").(string)
+
+	var err error
+	log.Println("Searching for available device...")
+	device, err := availableDevice(chrootDiskID)
+	if err != nil {
+		err := fmt.Errorf("error finding available device: %s", err)
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	if _, err := os.Stat(device); err == nil {
+		err := fmt.Errorf("device is in use: %s", device)
+		state.Put("error", err)
+		ui.Error(err.Error())
+		return multistep.ActionHalt
+	}
+
+	ui.Say(fmt.Sprintf("Found device: %s", device))
+	state.Put("device", device)
+	return multistep.ActionContinue
+}
+
+func (s *stepPrepareDevice) Cleanup(state multistep.StateBag) {}
+
+func availableDevice(scsiID string) (string, error) {
+	// TODO proper SCSI search
+	return "/dev/sdb", nil
+}

builder/hyperone/utils.go

@@ -3,6 +3,9 @@ package hyperone
 import (
 	"fmt"
 
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+	"github.com/hashicorp/packer/template/interpolate"
 	"github.com/hyperonecom/h1-client-go"
 )
 
@@ -14,3 +17,40 @@ func formatOpenAPIError(err error) string {
 
 	return fmt.Sprintf("%s (body: %s)", openAPIError.Error(), openAPIError.Body())
 }
+
+func runCommands(commands []string, ctx interpolate.Context, state multistep.StateBag) error {
+	ui := state.Get("ui").(packer.Ui)
+	wrappedCommand := state.Get("wrappedCommand").(CommandWrapper)
+	comm := state.Get("communicator").(packer.Communicator)
+
+	for _, rawCmd := range commands {
+		intCmd, err := interpolate.Render(rawCmd, &ctx)
+		if err != nil {
+			return fmt.Errorf("error interpolating: %s", err)
+		}
+
+		command, err := wrappedCommand(intCmd)
+		if err != nil {
+			return fmt.Errorf("error wrapping command: %s", err)
+		}
+
+		remoteCmd := &packer.RemoteCmd{
+			Command: command,
+		}
+
+		ui.Say(fmt.Sprintf("Executing command: %s", command))
+
+		err = remoteCmd.StartWithUi(comm, ui)
+		if err != nil {
+			return fmt.Errorf("error running remote cmd: %s", err)
+		}
+
+		if remoteCmd.ExitStatus != 0 {
+			return fmt.Errorf(
+				"received non-zero exit code %d from command: %s",
+				remoteCmd.ExitStatus,
+				command)
+		}
+	}
+	return nil
+}

examples/hyperone/chroot.json

@@ -0,0 +1,29 @@
+{
+    "variables": {
+        "token": "{{ env `HYPERONE_TOKEN` }}",
+        "project": "{{ env `HYPERONE_PROJECT` }}"
+    },
+    "builders": [
+        {
+            "token": "{{ user `token` }}",
+            "project": "{{ user `project` }}",
+            "type": "hyperone",
+            "source_image": "ubuntu",
+            "disk_size": 10,
+            "vm_type": "a1.nano",
+
+            "chroot_disk": true,
+            "chroot_command_wrapper": "sudo {{.Command}}",
+            "pre_mount_commands": [
+                "parted {{.Device}} mklabel msdos mkpart primary 1M 100% set 1 boot on print",
+                "mkfs.ext4 {{.Device}}1"
+            ],
+            "post_mount_commands": [
+                "apt-get update",
+                "apt-get install debootstrap",
+                "debootstrap --arch amd64 bionic {{.MountPath}}"
+            ]
+        }
+    ],
+    "provisioners": []
+}

website/source/docs/builders/hyperone.html.md

@@ -114,7 +114,7 @@ builder.
 
 -   `disk_name` (string) - The name of the created disk.
 
--   `disk_type` (string) - The type of the created disk.
+-   `disk_type` (string) - The type of the created disk. Defaults to `ssd`.
 
 -   `image_description` (string) - The description of the resulting image.
 
@@ -154,6 +154,57 @@ builder.
 -   `vm_tags` (map of key/value strings) - Key/value pair tags to
     add to the created server.
 
+## Chroot disk
+
+### Required:
+
+-   `chroot_disk` (bool) - Set to `true` to enable chroot disk build.
+
+-   `pre_mount_commands` (array of strings) - A series of commands to execute
+    before mounting the chroot. This should include any partitioning and 
+    filesystem creation commands. The path to the device is provided by
+    `{{.Device}}`.
+
+### Optional:
+
+-   `chroot_command_wrapper` (string) - How to run shell commands. This defaults
+    to `{{.Command}}`. This may be useful to set if you want to set
+    environment variables or run commands with `sudo`.
+
+-   `chroot_copy_files` (array of strings) - Paths to files on the running VM
+    that will be copied into the chroot environment before provisioning.
+    Defaults to `/etc/resolv.conf` so that DNS lookups work.
+
+-   `chroot_disk_size` (float) - The size of the chroot disk in GiB. Defaults
+    to `disk_size`.
+
+-   `chroot_disk_type` (string) - The type of the chroot disk. Defaults to
+    `disk_type`.
+
+-   `chroot_mount_path` (string) - The path on which the device will be mounted.
+
+-   `chroot_mounts` (array of strings) - A list of devices to mount into the
+    chroot environment. This is a list of 3-element tuples, in order:
+
+    -   The filesystem type. If this is "bind", then Packer will properly bind the
+        filesystem to another mount point.
+
+    -   The source device.
+
+    -   The mount directory.
+
+-   `mount_options` (array of tuples) - Options to supply the `mount` command
+    when mounting devices. Each option will be prefixed with `-o` and supplied
+    to the `mount` command.
+
+-   `mount_partition` (string) - The partition number containing the / partition.
+    By default this is the first partition of the volume (for example, sdb1).
+
+-   `post_mount_commands` (array of strings) - As `pre_mount_commands`, but the
+    commands are executed after mounting the root device and before the extra
+    mount and copy steps. The device and mount path are provided by
+    `{{.Device}}` and `{{.MountPath}}`.
+
 ## Basic Example
 
 Here is a basic example. It is completely valid as soon as you enter your own
@@ -161,10 +212,29 @@ token.
 
 ``` json
 {
-  "type": "hyperone",
-  "token": "YOUR_AUTH_TOKEN",
-  "source_image": "ubuntu-18.04",
-  "vm_flavour": "a1.nano",
-  "disk_size": 10
+    "type": "hyperone",
+    "token": "YOUR_AUTH_TOKEN",
+    "source_image": "ubuntu-18.04",
+    "vm_flavour": "a1.nano",
+    "disk_size": 10
+}
+```
+
+## Chroot Example
+
+
+``` json
+{
+    "type": "hyperone",
+    "token": "YOUR_AUTH_TOKEN",
+    "source_image": "ubuntu-18.04",
+    "vm_flavour": "a1.nano",
+    "disk_size": 10,
+    "chroot_disk": true,
+    "pre_mount_commands": [
+        "apt-get update",
+        "apt-get install debootstrap",
+        "debootstrap --arch amd64 bionic {{.MountPath}}"
+    ]
 }
 ```