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builder.go
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builder.go
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// The amazonebs package contains a packer.Builder implementation that
// builds AMIs for Amazon EC2.
//
// In general, there are two types of AMIs that can be created: ebs-backed or
// instance-store. This builder _only_ builds ebs-backed images.
package ebs
import (
"fmt"
"github.com/mitchellh/goamz/ec2"
"github.com/mitchellh/multistep"
awscommon "github.com/mitchellh/packer/builder/amazon/common"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/packer"
"log"
)
// The unique ID for this builder
const BuilderId = "mitchellh.amazonebs"
type config struct {
common.PackerConfig `mapstructure:",squash"`
awscommon.AccessConfig `mapstructure:",squash"`
awscommon.AMIConfig `mapstructure:",squash"`
awscommon.RunConfig `mapstructure:",squash"`
// Tags for the AMI
Tags map[string]string
tpl *common.Template
}
type Builder struct {
config config
runner multistep.Runner
}
func (b *Builder) Prepare(raws ...interface{}) error {
md, err := common.DecodeConfig(&b.config, raws...)
if err != nil {
return err
}
b.config.tpl, err = common.NewTemplate()
if err != nil {
return err
}
b.config.tpl.UserVars = b.config.PackerUserVars
// Accumulate any errors
errs := common.CheckUnusedConfig(md)
errs = packer.MultiErrorAppend(errs, b.config.AccessConfig.Prepare(b.config.tpl)...)
errs = packer.MultiErrorAppend(errs, b.config.AMIConfig.Prepare(b.config.tpl)...)
errs = packer.MultiErrorAppend(errs, b.config.RunConfig.Prepare(b.config.tpl)...)
// Accumulate any errors
newTags := make(map[string]string)
for k, v := range b.config.Tags {
k, err = b.config.tpl.Process(k, nil)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("Error processing tag key %s: %s", k, err))
continue
}
v, err = b.config.tpl.Process(v, nil)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("Error processing tag value '%s': %s", v, err))
continue
}
newTags[k] = v
}
b.config.Tags = newTags
if errs != nil && len(errs.Errors) > 0 {
return 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) {
region, err := b.config.Region()
if err != nil {
return nil, err
}
auth, err := b.config.AccessConfig.Auth()
if err != nil {
return nil, err
}
ec2conn := ec2.New(auth, region)
// Setup the state bag and initial state for the steps
state := make(map[string]interface{})
state["config"] = b.config
state["ec2"] = ec2conn
state["hook"] = hook
state["ui"] = ui
// Build the steps
steps := []multistep.Step{
&awscommon.StepKeyPair{},
&awscommon.StepSecurityGroup{
SecurityGroupId: b.config.SecurityGroupId,
SSHPort: b.config.SSHPort,
VpcId: b.config.VpcId,
},
&awscommon.StepRunSourceInstance{
ExpectedRootDevice: "ebs",
InstanceType: b.config.InstanceType,
UserData: b.config.UserData,
UserDataFile: b.config.UserDataFile,
SourceAMI: b.config.SourceAmi,
IamInstanceProfile: b.config.IamInstanceProfile,
SubnetId: b.config.SubnetId,
},
&common.StepConnectSSH{
SSHAddress: awscommon.SSHAddress(ec2conn, b.config.SSHPort),
SSHConfig: awscommon.SSHConfig(b.config.SSHUsername),
SSHWaitTimeout: b.config.SSHTimeout(),
},
&common.StepProvision{},
&stepStopInstance{},
&stepCreateAMI{},
&awscommon.StepCreateTags{Tags: b.config.Tags},
&awscommon.StepModifyAMIAttributes{
Description: b.config.AMIDescription,
Users: b.config.AMIUsers,
Groups: b.config.AMIGroups,
},
}
// Run!
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 there are no AMIs, then just return
if _, ok := state["amis"]; !ok {
return nil, nil
}
// Build the artifact and return it
artifact := &awscommon.Artifact{
Amis: state["amis"].(map[string]string),
BuilderIdValue: BuilderId,
Conn: ec2conn,
}
return artifact, nil
}
func (b *Builder) Cancel() {
if b.runner != nil {
log.Println("Cancelling the step runner...")
b.runner.Cancel()
}
}