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builder.go
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builder.go
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package iso
import (
"errors"
"fmt"
"log"
"os"
"path/filepath"
"strings"
hypervcommon "github.com/hashicorp/packer/builder/hyperv/common"
"github.com/hashicorp/packer/common"
"github.com/hashicorp/packer/common/bootcommand"
powershell "github.com/hashicorp/packer/common/powershell"
"github.com/hashicorp/packer/common/powershell/hyperv"
"github.com/hashicorp/packer/helper/communicator"
"github.com/hashicorp/packer/helper/config"
"github.com/hashicorp/packer/helper/multistep"
"github.com/hashicorp/packer/packer"
"github.com/hashicorp/packer/template/interpolate"
)
const (
DefaultDiskSize = 40 * 1024 // ~40GB
MinDiskSize = 256 // 256MB
MaxDiskSize = 64 * 1024 * 1024 // 64TB
MaxVHDSize = 2040 * 1024 // 2040GB
DefaultDiskBlockSize = 32 // 32MB
MinDiskBlockSize = 1 // 1MB
MaxDiskBlockSize = 256 // 256MB
DefaultRamSize = 1 * 1024 // 1GB
MinRamSize = 32 // 32MB
MaxRamSize = 32 * 1024 // 32GB
MinNestedVirtualizationRamSize = 4 * 1024 // 4GB
LowRam = 256 // 256MB
DefaultUsername = ""
DefaultPassword = ""
)
// Builder implements packer.Builder and builds the actual Hyperv
// images.
type Builder struct {
config Config
runner multistep.Runner
}
type Config struct {
common.PackerConfig `mapstructure:",squash"`
common.HTTPConfig `mapstructure:",squash"`
common.ISOConfig `mapstructure:",squash"`
common.FloppyConfig `mapstructure:",squash"`
bootcommand.BootConfig `mapstructure:",squash"`
hypervcommon.OutputConfig `mapstructure:",squash"`
hypervcommon.SSHConfig `mapstructure:",squash"`
hypervcommon.ShutdownConfig `mapstructure:",squash"`
// The size, in megabytes, of the hard disk to create for the VM.
// By default, this is 130048 (about 127 GB).
DiskSize uint `mapstructure:"disk_size"`
// The size, in megabytes, of the block size used to create the hard disk.
// By default, this is 32768 (about 32 MB)
DiskBlockSize uint `mapstructure:"disk_block_size"`
// The size, in megabytes, of the computer memory in the VM.
// By default, this is 1024 (about 1 GB).
RamSize uint `mapstructure:"ram_size"`
//
SecondaryDvdImages []string `mapstructure:"secondary_iso_images"`
// Should integration services iso be mounted
GuestAdditionsMode string `mapstructure:"guest_additions_mode"`
// The path to the integration services iso
GuestAdditionsPath string `mapstructure:"guest_additions_path"`
// This is the name of the new virtual machine.
// By default this is "packer-BUILDNAME", where "BUILDNAME" is the name of the build.
VMName string `mapstructure:"vm_name"`
SwitchName string `mapstructure:"switch_name"`
SwitchVlanId string `mapstructure:"switch_vlan_id"`
MacAddress string `mapstructure:"mac_address"`
VlanId string `mapstructure:"vlan_id"`
Cpu uint `mapstructure:"cpu"`
Generation uint `mapstructure:"generation"`
EnableMacSpoofing bool `mapstructure:"enable_mac_spoofing"`
EnableDynamicMemory bool `mapstructure:"enable_dynamic_memory"`
EnableSecureBoot bool `mapstructure:"enable_secure_boot"`
SecureBootTemplate string `mapstructure:"secure_boot_template"`
EnableVirtualizationExtensions bool `mapstructure:"enable_virtualization_extensions"`
TempPath string `mapstructure:"temp_path"`
// A separate path can be used for storing the VM's disk image. The purpose is to enable
// reading and writing to take place on different physical disks (read from VHD temp path
// write to regular temp path while exporting the VM) to eliminate a single-disk bottleneck.
VhdTempPath string `mapstructure:"vhd_temp_path"`
Communicator string `mapstructure:"communicator"`
AdditionalDiskSize []uint `mapstructure:"disk_additional_size"`
SkipCompaction bool `mapstructure:"skip_compaction"`
SkipExport bool `mapstructure:"skip_export"`
// Use differencing disk
DifferencingDisk bool `mapstructure:"differencing_disk"`
// Create the VM with a Fixed VHD format disk instead of Dynamic VHDX
FixedVHD bool `mapstructure:"use_fixed_vhd_format"`
Headless bool `mapstructure:"headless"`
ctx interpolate.Context
}
// Prepare processes the build configuration parameters.
func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
err := config.Decode(&b.config, &config.DecodeOpts{
Interpolate: true,
InterpolateContext: &b.config.ctx,
InterpolateFilter: &interpolate.RenderFilter{
Exclude: []string{
"boot_command",
},
},
}, raws...)
if err != nil {
return nil, err
}
// Accumulate any errors and warnings
var errs *packer.MultiError
warnings := make([]string, 0)
isoWarnings, isoErrs := b.config.ISOConfig.Prepare(&b.config.ctx)
warnings = append(warnings, isoWarnings...)
errs = packer.MultiErrorAppend(errs, isoErrs...)
errs = packer.MultiErrorAppend(errs, b.config.BootConfig.Prepare(&b.config.ctx)...)
errs = packer.MultiErrorAppend(errs, b.config.FloppyConfig.Prepare(&b.config.ctx)...)
errs = packer.MultiErrorAppend(errs, b.config.HTTPConfig.Prepare(&b.config.ctx)...)
errs = packer.MultiErrorAppend(errs, b.config.OutputConfig.Prepare(&b.config.ctx, &b.config.PackerConfig)...)
errs = packer.MultiErrorAppend(errs, b.config.SSHConfig.Prepare(&b.config.ctx)...)
errs = packer.MultiErrorAppend(errs, b.config.ShutdownConfig.Prepare(&b.config.ctx)...)
if len(b.config.ISOConfig.ISOUrls) < 1 || (strings.ToLower(filepath.Ext(b.config.ISOConfig.ISOUrls[0])) != ".vhd" && strings.ToLower(filepath.Ext(b.config.ISOConfig.ISOUrls[0])) != ".vhdx") {
//We only create a new hard drive if an existing one to copy from does not exist
err = b.checkDiskSize()
if err != nil {
errs = packer.MultiErrorAppend(errs, err)
}
}
err = b.checkDiskBlockSize()
if err != nil {
errs = packer.MultiErrorAppend(errs, err)
}
err = b.checkRamSize()
if err != nil {
errs = packer.MultiErrorAppend(errs, err)
}
if b.config.VMName == "" {
b.config.VMName = fmt.Sprintf("packer-%s", b.config.PackerBuildName)
}
log.Println(fmt.Sprintf("%s: %v", "VMName", b.config.VMName))
if b.config.SwitchName == "" {
b.config.SwitchName = b.detectSwitchName()
}
if b.config.Cpu < 1 {
b.config.Cpu = 1
}
if b.config.Generation < 1 || b.config.Generation > 2 {
b.config.Generation = 1
}
if b.config.Generation == 2 {
if len(b.config.FloppyFiles) > 0 || len(b.config.FloppyDirectories) > 0 {
err = errors.New("Generation 2 vms don't support floppy drives. Use ISO image instead.")
errs = packer.MultiErrorAppend(errs, err)
}
}
if len(b.config.AdditionalDiskSize) > 64 {
err = errors.New("VM's currently support a maximum of 64 additional SCSI attached disks.")
errs = packer.MultiErrorAppend(errs, err)
}
log.Println(fmt.Sprintf("Using switch %s", b.config.SwitchName))
log.Println(fmt.Sprintf("%s: %v", "SwitchName", b.config.SwitchName))
// Errors
if b.config.GuestAdditionsMode == "" {
if b.config.GuestAdditionsPath != "" {
b.config.GuestAdditionsMode = "attach"
} else {
b.config.GuestAdditionsPath = os.Getenv("WINDIR") + "\\system32\\vmguest.iso"
if _, err := os.Stat(b.config.GuestAdditionsPath); os.IsNotExist(err) {
if err != nil {
b.config.GuestAdditionsPath = ""
b.config.GuestAdditionsMode = "none"
} else {
b.config.GuestAdditionsMode = "attach"
}
}
}
}
if b.config.GuestAdditionsPath == "" && b.config.GuestAdditionsMode == "attach" {
b.config.GuestAdditionsPath = os.Getenv("WINDIR") + "\\system32\\vmguest.iso"
if _, err := os.Stat(b.config.GuestAdditionsPath); os.IsNotExist(err) {
if err != nil {
b.config.GuestAdditionsPath = ""
}
}
}
for _, isoPath := range b.config.SecondaryDvdImages {
if _, err := os.Stat(isoPath); os.IsNotExist(err) {
if err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Secondary Dvd image does not exist: %s", err))
}
}
}
numberOfIsos := len(b.config.SecondaryDvdImages)
if b.config.GuestAdditionsMode == "attach" {
if _, err := os.Stat(b.config.GuestAdditionsPath); os.IsNotExist(err) {
if err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Guest additions iso does not exist: %s", err))
}
}
numberOfIsos = numberOfIsos + 1
}
if b.config.Generation < 2 && numberOfIsos > 2 {
if b.config.GuestAdditionsMode == "attach" {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("There are only 2 ide controllers available, so we can't support guest additions and these secondary dvds: %s", strings.Join(b.config.SecondaryDvdImages, ", ")))
} else {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("There are only 2 ide controllers available, so we can't support these secondary dvds: %s", strings.Join(b.config.SecondaryDvdImages, ", ")))
}
} else if b.config.Generation > 1 && len(b.config.SecondaryDvdImages) > 16 {
if b.config.GuestAdditionsMode == "attach" {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("There are not enough drive letters available for scsi (limited to 16), so we can't support guest additions and these secondary dvds: %s", strings.Join(b.config.SecondaryDvdImages, ", ")))
} else {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("There are not enough drive letters available for scsi (limited to 16), so we can't support these secondary dvds: %s", strings.Join(b.config.SecondaryDvdImages, ", ")))
}
}
if b.config.EnableVirtualizationExtensions {
hasVirtualMachineVirtualizationExtensions, err := powershell.HasVirtualMachineVirtualizationExtensions()
if err != nil {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("Failed detecting virtual machine virtualization extensions support: %s", err))
} else {
if !hasVirtualMachineVirtualizationExtensions {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("This version of Hyper-V does not support virtual machine virtualization extension. Please use Windows 10 or Windows Server 2016 or newer."))
}
}
}
if b.config.Generation > 1 && b.config.FixedVHD {
err = errors.New("Fixed VHD disks are only supported on Generation 1 virtual machines.")
errs = packer.MultiErrorAppend(errs, err)
}
if !b.config.SkipCompaction && b.config.FixedVHD {
err = errors.New("Fixed VHD disks do not support compaction.")
errs = packer.MultiErrorAppend(errs, err)
}
if b.config.DifferencingDisk && b.config.FixedVHD {
err = errors.New("Fixed VHD disks are not supported with differencing disks.")
errs = packer.MultiErrorAppend(errs, err)
}
// Warnings
if b.config.ShutdownCommand == "" {
warnings = append(warnings,
"A shutdown_command was not specified. Without a shutdown command, Packer\n"+
"will forcibly halt the virtual machine, which may result in data loss.")
}
warning := b.checkHostAvailableMemory()
if warning != "" {
warnings = appendWarnings(warnings, warning)
}
if b.config.EnableVirtualizationExtensions {
if b.config.EnableDynamicMemory {
warning = fmt.Sprintf("For nested virtualization, when virtualization extension is enabled, dynamic memory should not be allowed.")
warnings = appendWarnings(warnings, warning)
}
if !b.config.EnableMacSpoofing {
warning = fmt.Sprintf("For nested virtualization, when virtualization extension is enabled, mac spoofing should be allowed.")
warnings = appendWarnings(warnings, warning)
}
if b.config.RamSize < MinNestedVirtualizationRamSize {
warning = fmt.Sprintf("For nested virtualization, when virtualization extension is enabled, there should be 4GB or more memory set for the vm, otherwise Hyper-V may fail to start any nested VMs.")
warnings = appendWarnings(warnings, warning)
}
}
if b.config.SwitchVlanId != "" {
if b.config.SwitchVlanId != b.config.VlanId {
warning = fmt.Sprintf("Switch network adaptor vlan should match virtual machine network adaptor vlan. The switch will not be able to see traffic from the VM.")
warnings = appendWarnings(warnings, warning)
}
}
if errs != nil && len(errs.Errors) > 0 {
return warnings, errs
}
return warnings, nil
}
// Run executes a Packer build and returns a packer.Artifact representing
// a Hyperv appliance.
func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
// Create the driver that we'll use to communicate with Hyperv
driver, err := hypervcommon.NewHypervPS4Driver()
if err != nil {
return nil, fmt.Errorf("Failed creating Hyper-V driver: %s", err)
}
// Set up the state.
state := new(multistep.BasicStateBag)
state.Put("cache", cache)
state.Put("config", &b.config)
state.Put("debug", b.config.PackerDebug)
state.Put("driver", driver)
state.Put("hook", hook)
state.Put("ui", ui)
steps := []multistep.Step{
&hypervcommon.StepCreateTempDir{
TempPath: b.config.TempPath,
VhdTempPath: b.config.VhdTempPath,
},
&hypervcommon.StepOutputDir{
Force: b.config.PackerForce,
Path: b.config.OutputDir,
},
&common.StepDownload{
Checksum: b.config.ISOChecksum,
ChecksumType: b.config.ISOChecksumType,
Description: "ISO",
ResultKey: "iso_path",
Url: b.config.ISOUrls,
Extension: b.config.TargetExtension,
TargetPath: b.config.TargetPath,
},
&common.StepCreateFloppy{
Files: b.config.FloppyConfig.FloppyFiles,
Directories: b.config.FloppyConfig.FloppyDirectories,
},
&common.StepHTTPServer{
HTTPDir: b.config.HTTPDir,
HTTPPortMin: b.config.HTTPPortMin,
HTTPPortMax: b.config.HTTPPortMax,
},
&hypervcommon.StepCreateSwitch{
SwitchName: b.config.SwitchName,
},
&hypervcommon.StepCreateVM{
VMName: b.config.VMName,
SwitchName: b.config.SwitchName,
RamSize: b.config.RamSize,
DiskSize: b.config.DiskSize,
DiskBlockSize: b.config.DiskBlockSize,
Generation: b.config.Generation,
Cpu: b.config.Cpu,
EnableMacSpoofing: b.config.EnableMacSpoofing,
EnableDynamicMemory: b.config.EnableDynamicMemory,
EnableSecureBoot: b.config.EnableSecureBoot,
SecureBootTemplate: b.config.SecureBootTemplate,
EnableVirtualizationExtensions: b.config.EnableVirtualizationExtensions,
AdditionalDiskSize: b.config.AdditionalDiskSize,
DifferencingDisk: b.config.DifferencingDisk,
SkipExport: b.config.SkipExport,
OutputDir: b.config.OutputDir,
MacAddress: b.config.MacAddress,
FixedVHD: b.config.FixedVHD,
},
&hypervcommon.StepEnableIntegrationService{},
&hypervcommon.StepMountDvdDrive{
Generation: b.config.Generation,
},
&hypervcommon.StepMountFloppydrive{
Generation: b.config.Generation,
},
&hypervcommon.StepMountGuestAdditions{
GuestAdditionsMode: b.config.GuestAdditionsMode,
GuestAdditionsPath: b.config.GuestAdditionsPath,
Generation: b.config.Generation,
},
&hypervcommon.StepMountSecondaryDvdImages{
IsoPaths: b.config.SecondaryDvdImages,
Generation: b.config.Generation,
},
&hypervcommon.StepConfigureVlan{
VlanId: b.config.VlanId,
SwitchVlanId: b.config.SwitchVlanId,
},
&hypervcommon.StepRun{
Headless: b.config.Headless,
},
&hypervcommon.StepTypeBootCommand{
BootCommand: b.config.FlatBootCommand(),
BootWait: b.config.BootWait,
SwitchName: b.config.SwitchName,
Ctx: b.config.ctx,
},
// configure the communicator ssh, winrm
&communicator.StepConnect{
Config: &b.config.SSHConfig.Comm,
Host: hypervcommon.CommHost,
SSHConfig: hypervcommon.SSHConfigFunc(&b.config.SSHConfig),
},
// provision requires communicator to be setup
&common.StepProvision{},
&hypervcommon.StepShutdown{
Command: b.config.ShutdownCommand,
Timeout: b.config.ShutdownTimeout,
},
// wait for the vm to be powered off
&hypervcommon.StepWaitForPowerOff{},
// remove the secondary dvd images
// after we power down
&hypervcommon.StepUnmountSecondaryDvdImages{},
&hypervcommon.StepUnmountGuestAdditions{},
&hypervcommon.StepUnmountDvdDrive{},
&hypervcommon.StepUnmountFloppyDrive{
Generation: b.config.Generation,
},
&hypervcommon.StepExportVm{
OutputDir: b.config.OutputDir,
SkipCompaction: b.config.SkipCompaction,
SkipExport: b.config.SkipExport,
},
// the clean up actions for each step will be executed reverse order
}
// Run the steps.
b.runner = common.NewRunner(steps, b.config.PackerConfig, ui)
b.runner.Run(state)
// Report any errors.
if rawErr, ok := state.GetOk("error"); ok {
return nil, rawErr.(error)
}
// If we were interrupted or cancelled, then just exit.
if _, ok := state.GetOk(multistep.StateCancelled); ok {
return nil, errors.New("Build was cancelled.")
}
if _, ok := state.GetOk(multistep.StateHalted); ok {
return nil, errors.New("Build was halted.")
}
return hypervcommon.NewArtifact(b.config.OutputDir)
}
// Cancel.
func (b *Builder) Cancel() {
if b.runner != nil {
log.Println("Cancelling the step runner...")
b.runner.Cancel()
}
}
func appendWarnings(slice []string, data ...string) []string {
m := len(slice)
n := m + len(data)
if n > cap(slice) { // if necessary, reallocate
// allocate double what's needed, for future growth.
newSlice := make([]string, (n+1)*2)
copy(newSlice, slice)
slice = newSlice
}
slice = slice[0:n]
copy(slice[m:n], data)
return slice
}
func (b *Builder) checkDiskSize() error {
if b.config.DiskSize == 0 {
b.config.DiskSize = DefaultDiskSize
}
log.Println(fmt.Sprintf("%s: %v", "DiskSize", b.config.DiskSize))
if b.config.DiskSize < MinDiskSize {
return fmt.Errorf("disk_size: Virtual machine requires disk space >= %v GB, but defined: %v", MinDiskSize, b.config.DiskSize/1024)
} else if b.config.DiskSize > MaxDiskSize && !b.config.FixedVHD {
return fmt.Errorf("disk_size: Virtual machine requires disk space <= %v GB, but defined: %v", MaxDiskSize, b.config.DiskSize/1024)
} else if b.config.DiskSize > MaxVHDSize && b.config.FixedVHD {
return fmt.Errorf("disk_size: Virtual machine requires disk space <= %v GB, but defined: %v", MaxVHDSize/1024, b.config.DiskSize/1024)
}
return nil
}
func (b *Builder) checkDiskBlockSize() error {
if b.config.DiskBlockSize == 0 {
b.config.DiskBlockSize = DefaultDiskBlockSize
}
log.Println(fmt.Sprintf("%s: %v", "DiskBlockSize", b.config.DiskBlockSize))
if b.config.DiskBlockSize < MinDiskBlockSize {
return fmt.Errorf("disk_block_size: Virtual machine requires disk block size >= %v MB, but defined: %v", MinDiskBlockSize, b.config.DiskBlockSize)
} else if b.config.DiskBlockSize > MaxDiskBlockSize {
return fmt.Errorf("disk_block_size: Virtual machine requires disk block size <= %v MB, but defined: %v", MaxDiskBlockSize, b.config.DiskBlockSize)
}
return nil
}
func (b *Builder) checkRamSize() error {
if b.config.RamSize == 0 {
b.config.RamSize = DefaultRamSize
}
log.Println(fmt.Sprintf("%s: %v", "RamSize", b.config.RamSize))
if b.config.RamSize < MinRamSize {
return fmt.Errorf("ram_size: Virtual machine requires memory size >= %v MB, but defined: %v", MinRamSize, b.config.RamSize)
} else if b.config.RamSize > MaxRamSize {
return fmt.Errorf("ram_size: Virtual machine requires memory size <= %v MB, but defined: %v", MaxRamSize, b.config.RamSize)
}
return nil
}
func (b *Builder) checkHostAvailableMemory() string {
powershellAvailable, _, _ := powershell.IsPowershellAvailable()
if powershellAvailable {
freeMB := powershell.GetHostAvailableMemory()
if (freeMB - float64(b.config.RamSize)) < LowRam {
return fmt.Sprintf("Hyper-V might fail to create a VM if there is not enough free memory in the system.")
}
}
return ""
}
func (b *Builder) detectSwitchName() string {
powershellAvailable, _, _ := powershell.IsPowershellAvailable()
if powershellAvailable {
// no switch name, try to get one attached to a online network adapter
onlineSwitchName, err := hyperv.GetExternalOnlineVirtualSwitch()
if onlineSwitchName != "" && err == nil {
return onlineSwitchName
}
}
return fmt.Sprintf("packer-%s", b.config.PackerBuildName)
}