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builder.go
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/
builder.go
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// The digitalocean package contains a packer.Builder implementation
// that builds DigitalOcean images (snapshots).
package digitalocean
import (
"bytes"
"errors"
"fmt"
"github.com/mitchellh/mapstructure"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/builder/common"
"github.com/mitchellh/packer/packer"
"log"
"strconv"
"text/template"
"time"
)
// The unique id for the builder
const BuilderId = "pearkes.digitalocean"
type snapshotNameData struct {
CreateTime string
}
// Configuration tells the builder the credentials
// to use while communicating with DO and describes the image
// you are creating
type config struct {
ClientID string `mapstructure:"client_id"`
APIKey string `mapstructure:"api_key"`
RegionID uint `mapstructure:"region_id"`
SizeID uint `mapstructure:"size_id"`
ImageID uint `mapstructure:"image_id"`
SnapshotName string
SSHUsername string `mapstructure:"ssh_username"`
SSHPort uint `mapstructure:"ssh_port"`
SSHTimeout time.Duration
EventDelay time.Duration
StateTimeout time.Duration
PackerDebug bool `mapstructure:"packer_debug"`
RawSnapshotName string `mapstructure:"snapshot_name"`
RawSSHTimeout string `mapstructure:"ssh_timeout"`
RawEventDelay string `mapstructure:"event_delay"`
RawStateTimeout string `mapstructure:"state_timeout"`
}
type Builder struct {
config config
runner multistep.Runner
}
func (b *Builder) Prepare(raws ...interface{}) error {
for _, raw := range raws {
err := mapstructure.Decode(raw, &b.config)
if err != nil {
return err
}
}
// Optional configuration with defaults
//
if b.config.RegionID == 0 {
// Default to Region "New York"
b.config.RegionID = 1
}
if b.config.SizeID == 0 {
// Default to 512mb, the smallest droplet size
b.config.SizeID = 66
}
if b.config.ImageID == 0 {
// Default to base image "Ubuntu 12.04 x64 Server (id: 284203)"
b.config.ImageID = 284203
}
if b.config.SSHUsername == "" {
// Default to "root". You can override this if your
// SourceImage has a different user account then the DO default
b.config.SSHUsername = "root"
}
if b.config.SSHPort == 0 {
// Default to port 22 per DO default
b.config.SSHPort = 22
}
if b.config.RawSnapshotName == "" {
// Default to packer-{{ unix timestamp (utc) }}
b.config.RawSnapshotName = "packer-{{.CreateTime}}"
}
if b.config.RawSSHTimeout == "" {
// Default to 1 minute timeouts
b.config.RawSSHTimeout = "1m"
}
if b.config.RawEventDelay == "" {
// Default to 5 second delays after creating events
// to allow DO to process
b.config.RawEventDelay = "5s"
}
if b.config.RawStateTimeout == "" {
// Default to 6 minute timeouts waiting for
// desired state. i.e waiting for droplet to become active
b.config.RawStateTimeout = "6m"
}
// A list of errors on the configuration
errs := make([]error, 0)
// Required configurations that will display errors if not set
//
if b.config.ClientID == "" {
errs = append(errs, errors.New("a client_id must be specified"))
}
if b.config.APIKey == "" {
errs = append(errs, errors.New("an api_key must be specified"))
}
sshTimeout, err := time.ParseDuration(b.config.RawSSHTimeout)
if err != nil {
errs = append(errs, fmt.Errorf("Failed parsing ssh_timeout: %s", err))
}
b.config.SSHTimeout = sshTimeout
eventDelay, err := time.ParseDuration(b.config.RawEventDelay)
if err != nil {
errs = append(errs, fmt.Errorf("Failed parsing event_delay: %s", err))
}
b.config.EventDelay = eventDelay
stateTimeout, err := time.ParseDuration(b.config.RawStateTimeout)
if err != nil {
errs = append(errs, fmt.Errorf("Failed parsing state_timeout: %s", err))
}
b.config.StateTimeout = stateTimeout
// Parse the name of the snapshot
snapNameBuf := new(bytes.Buffer)
tData := snapshotNameData{
strconv.FormatInt(time.Now().UTC().Unix(), 10),
}
t, err := template.New("snapshot").Parse(b.config.RawSnapshotName)
if err != nil {
errs = append(errs, fmt.Errorf("Failed parsing snapshot_name: %s", err))
} else {
t.Execute(snapNameBuf, tData)
b.config.SnapshotName = snapNameBuf.String()
}
if len(errs) > 0 {
return &packer.MultiError{errs}
}
log.Printf("Config: %+v", b.config)
return nil
}
func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
// Initialize the DO API client
client := DigitalOceanClient{}.New(b.config.ClientID, b.config.APIKey)
// Set up the state
state := make(map[string]interface{})
state["config"] = b.config
state["client"] = client
state["hook"] = hook
state["ui"] = ui
// Build the steps
steps := []multistep.Step{
new(stepCreateSSHKey),
new(stepCreateDroplet),
new(stepDropletInfo),
new(stepConnectSSH),
new(stepProvision),
new(stepPowerOff),
new(stepSnapshot),
}
// Run the steps
if b.config.PackerDebug {
b.runner = &multistep.DebugRunner{
Steps: steps,
PauseFn: common.MultistepDebugFn(ui),
}
} else {
b.runner = &multistep.BasicRunner{Steps: steps}
}
b.runner.Run(state)
// If there was an error, return that
if rawErr, ok := state["error"]; ok {
return nil, rawErr.(error)
}
if _, ok := state["snapshot_name"]; !ok {
log.Println("Failed to find snapshot_name in state. Bug?")
return nil, nil
}
artifact := &Artifact{
snapshotName: state["snapshot_name"].(string),
snapshotId: state["snapshot_image_id"].(uint),
client: client,
}
return artifact, nil
}
func (b *Builder) Cancel() {
if b.runner != nil {
log.Println("Cancelling the step runner...")
b.runner.Cancel()
}
}