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package googlecompute
import (
"errors"
"fmt"
"io/ioutil"
"time"
"github.com/hashicorp/packer/packer"
"github.com/mitchellh/multistep"
)
// StepCreateInstance represents a Packer build step that creates GCE instances.
type StepCreateInstance struct {
Debug bool
}
func (c *Config) createInstanceMetadata(sourceImage *Image, sshPublicKey string) (map[string]string, error) {
instanceMetadata := make(map[string]string)
var err error
// Copy metadata from config.
for k, v := range c.Metadata {
instanceMetadata[k] = v
}
// Merge any existing ssh keys with our public key, unless there is no
// supplied public key. This is possible if a private_key_file was
// specified.
if sshPublicKey != "" {
sshMetaKey := "sshKeys"
sshKeys := fmt.Sprintf("%s:%s", c.Comm.SSHUsername, sshPublicKey)
if confSshKeys, exists := instanceMetadata[sshMetaKey]; exists {
sshKeys = fmt.Sprintf("%s\n%s", sshKeys, confSshKeys)
}
instanceMetadata[sshMetaKey] = sshKeys
}
// Wrap any startup script with our own startup script.
if c.StartupScriptFile != "" {
var content []byte
content, err = ioutil.ReadFile(c.StartupScriptFile)
instanceMetadata[StartupWrappedScriptKey] = string(content)
} else if wrappedStartupScript, exists := instanceMetadata[StartupScriptKey]; exists {
instanceMetadata[StartupWrappedScriptKey] = wrappedStartupScript
}
if sourceImage.IsWindows() {
// Windows startup script support is not yet implemented.
// Mark the startup script as done.
instanceMetadata[StartupScriptKey] = StartupScriptWindows
instanceMetadata[StartupScriptStatusKey] = StartupScriptStatusDone
} else {
instanceMetadata[StartupScriptKey] = StartupScriptLinux
instanceMetadata[StartupScriptStatusKey] = StartupScriptStatusNotDone
}
return instanceMetadata, err
}
func getImage(c *Config, d Driver) (*Image, error) {
name := c.SourceImageFamily
fromFamily := true
if c.SourceImage != "" {
name = c.SourceImage
fromFamily = false
}
if c.SourceImageProjectId == "" {
return d.GetImage(name, fromFamily)
} else {
return d.GetImageFromProject(c.SourceImageProjectId, name, fromFamily)
}
}
// Run executes the Packer build step that creates a GCE instance.
func (s *StepCreateInstance) Run(state multistep.StateBag) multistep.StepAction {
c := state.Get("config").(*Config)
d := state.Get("driver").(Driver)
sshPublicKey := state.Get("ssh_public_key").(string)
ui := state.Get("ui").(packer.Ui)
sourceImage, err := getImage(c, d)
if err != nil {
err := fmt.Errorf("Error getting source image for instance creation: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
ui.Say(fmt.Sprintf("Using image: %s", sourceImage.Name))
if sourceImage.IsWindows() && c.Comm.Type == "winrm" && c.Comm.WinRMPassword == "" {
state.Put("create_windows_password", true)
}
ui.Say("Creating instance...")
name := c.InstanceName
var errCh <-chan error
var metadata map[string]string
metadata, err = c.createInstanceMetadata(sourceImage, sshPublicKey)
errCh, err = d.RunInstance(&InstanceConfig{
AcceleratorType: c.AcceleratorType,
AcceleratorCount: c.AcceleratorCount,
Address: c.Address,
Description: "New instance created by Packer",
DiskSizeGb: c.DiskSizeGb,
DiskType: c.DiskType,
Image: sourceImage,
Labels: c.Labels,
MachineType: c.MachineType,
Metadata: metadata,
Name: name,
Network: c.Network,
NetworkProjectId: c.NetworkProjectId,
OmitExternalIP: c.OmitExternalIP,
OnHostMaintenance: c.OnHostMaintenance,
Preemptible: c.Preemptible,
Region: c.Region,
Scopes: c.Scopes,
Subnetwork: c.Subnetwork,
Tags: c.Tags,
Zone: c.Zone,
})
if err == nil {
ui.Message("Waiting for creation operation to complete...")
select {
case err = <-errCh:
case <-time.After(c.stateTimeout):
err = errors.New("time out while waiting for instance to create")
}
}
if err != nil {
err := fmt.Errorf("Error creating instance: %s", err)
state.Put("error", err)
ui.Error(err.Error())
return multistep.ActionHalt
}
ui.Message("Instance has been created!")
if s.Debug {
if name != "" {
ui.Message(fmt.Sprintf("Instance: %s started in %s", name, c.Zone))
}
}
// Things succeeded, store the name so we can remove it later
state.Put("instance_name", name)
return multistep.ActionContinue
}
// Cleanup destroys the GCE instance created during the image creation process.
func (s *StepCreateInstance) Cleanup(state multistep.StateBag) {
nameRaw, ok := state.GetOk("instance_name")
if !ok {
return
}
name := nameRaw.(string)
if name == "" {
return
}
config := state.Get("config").(*Config)
driver := state.Get("driver").(Driver)
ui := state.Get("ui").(packer.Ui)
ui.Say("Deleting instance...")
errCh, err := driver.DeleteInstance(config.Zone, name)
if err == nil {
select {
case err = <-errCh:
case <-time.After(config.stateTimeout):
err = errors.New("time out while waiting for instance to delete")
}
}
if err != nil {
ui.Error(fmt.Sprintf(
"Error deleting instance. Please delete it manually.\n\n"+
"Name: %s\n"+
"Error: %s", name, err))
}
ui.Message("Instance has been deleted!")
state.Put("instance_name", "")
// Deleting the instance does not remove the boot disk. This cleanup removes
// the disk.
ui.Say("Deleting disk...")
errCh, err = driver.DeleteDisk(config.Zone, config.DiskName)
if err == nil {
select {
case err = <-errCh:
case <-time.After(config.stateTimeout):
err = errors.New("time out while waiting for disk to delete")
}
}
if err != nil {
ui.Error(fmt.Sprintf(
"Error deleting disk. Please delete it manually.\n\n"+
"Name: %s\n"+
"Error: %s", config.InstanceName, err))
}
ui.Message("Disk has been deleted!")
return
}
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