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builder.go
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builder.go
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// The instance package contains a packer.Builder implementation that builds
// AMIs for Amazon EC2 backed by instance storage, as opposed to EBS storage.
package instance
import (
"errors"
"fmt"
"log"
"os"
"strings"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/mitchellh/multistep"
awscommon "github.com/mitchellh/packer/builder/amazon/common"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/helper/communicator"
"github.com/mitchellh/packer/helper/config"
"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/template/interpolate"
)
// The unique ID for this builder
const BuilderId = "mitchellh.amazon.instance"
// Config is the configuration that is chained through the steps and
// settable from the template.
type Config struct {
common.PackerConfig `mapstructure:",squash"`
awscommon.AccessConfig `mapstructure:",squash"`
awscommon.AMIConfig `mapstructure:",squash"`
awscommon.BlockDevices `mapstructure:",squash"`
awscommon.RunConfig `mapstructure:",squash"`
AccountId string `mapstructure:"account_id"`
BundleDestination string `mapstructure:"bundle_destination"`
BundlePrefix string `mapstructure:"bundle_prefix"`
BundleUploadCommand string `mapstructure:"bundle_upload_command"`
BundleVolCommand string `mapstructure:"bundle_vol_command"`
S3Bucket string `mapstructure:"s3_bucket"`
X509CertPath string `mapstructure:"x509_cert_path"`
X509KeyPath string `mapstructure:"x509_key_path"`
X509UploadPath string `mapstructure:"x509_upload_path"`
ctx interpolate.Context
}
type Builder struct {
config Config
runner multistep.Runner
}
func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
configs := make([]interface{}, len(raws)+1)
configs[0] = map[string]interface{}{
"bundle_prefix": "image-{{timestamp}}",
}
copy(configs[1:], raws)
b.config.ctx.Funcs = awscommon.TemplateFuncs
err := config.Decode(&b.config, &config.DecodeOpts{
Interpolate: true,
InterpolateContext: &b.config.ctx,
InterpolateFilter: &interpolate.RenderFilter{
Exclude: []string{
"bundle_upload_command",
"bundle_vol_command",
},
},
}, configs...)
if err != nil {
return nil, err
}
if b.config.BundleDestination == "" {
b.config.BundleDestination = "/tmp"
}
if b.config.BundleUploadCommand == "" {
if b.config.IamInstanceProfile != "" {
b.config.BundleUploadCommand = "sudo -i -n ec2-upload-bundle " +
"-b {{.BucketName}} " +
"-m {{.ManifestPath}} " +
"-d {{.BundleDirectory}} " +
"--batch " +
"--region {{.Region}} " +
"--retry"
} else {
b.config.BundleUploadCommand = "sudo -i -n ec2-upload-bundle " +
"-b {{.BucketName}} " +
"-m {{.ManifestPath}} " +
"-a {{.AccessKey}} " +
"-s {{.SecretKey}} " +
"-d {{.BundleDirectory}} " +
"--batch " +
"--region {{.Region}} " +
"--retry"
}
}
if b.config.BundleVolCommand == "" {
b.config.BundleVolCommand = "sudo -i -n ec2-bundle-vol " +
"-k {{.KeyPath}} " +
"-u {{.AccountId}} " +
"-c {{.CertPath}} " +
"-r {{.Architecture}} " +
"-e {{.PrivatePath}}/* " +
"-d {{.Destination}} " +
"-p {{.Prefix}} " +
"--batch " +
"--no-filter"
}
if b.config.X509UploadPath == "" {
b.config.X509UploadPath = "/tmp"
}
// Accumulate any errors
var errs *packer.MultiError
errs = packer.MultiErrorAppend(errs, b.config.AccessConfig.Prepare(&b.config.ctx)...)
errs = packer.MultiErrorAppend(errs, b.config.BlockDevices.Prepare(&b.config.ctx)...)
errs = packer.MultiErrorAppend(errs, b.config.AMIConfig.Prepare(&b.config.ctx)...)
errs = packer.MultiErrorAppend(errs, b.config.RunConfig.Prepare(&b.config.ctx)...)
if b.config.AccountId == "" {
errs = packer.MultiErrorAppend(errs, errors.New("account_id is required"))
} else {
b.config.AccountId = strings.Replace(b.config.AccountId, "-", "", -1)
}
if b.config.S3Bucket == "" {
errs = packer.MultiErrorAppend(errs, errors.New("s3_bucket is required"))
}
if b.config.X509CertPath == "" {
errs = packer.MultiErrorAppend(errs, errors.New("x509_cert_path is required"))
} else if _, err := os.Stat(b.config.X509CertPath); err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("x509_cert_path points to bad file: %s", err))
}
if b.config.X509KeyPath == "" {
errs = packer.MultiErrorAppend(errs, errors.New("x509_key_path is required"))
} else if _, err := os.Stat(b.config.X509KeyPath); err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("x509_key_path points to bad file: %s", err))
}
if errs != nil && len(errs.Errors) > 0 {
return nil, errs
}
log.Println(common.ScrubConfig(b.config, b.config.AccessKey, b.config.SecretKey))
return nil, nil
}
func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
config, err := b.config.Config()
if err != nil {
return nil, err
}
session := session.New(config)
ec2conn := ec2.New(session)
// If the subnet is specified but not the AZ, try to determine the AZ automatically
if b.config.SubnetId != "" && b.config.AvailabilityZone == "" {
log.Printf("[INFO] Finding AZ for the given subnet '%s'", b.config.SubnetId)
resp, err := ec2conn.DescribeSubnets(&ec2.DescribeSubnetsInput{SubnetIds: []*string{&b.config.SubnetId}})
if err != nil {
return nil, err
}
b.config.AvailabilityZone = *resp.Subnets[0].AvailabilityZone
log.Printf("[INFO] AZ found: '%s'", b.config.AvailabilityZone)
}
// Setup the state bag and initial state for the steps
state := new(multistep.BasicStateBag)
state.Put("config", &b.config)
state.Put("ec2", ec2conn)
state.Put("hook", hook)
state.Put("ui", ui)
// Build the steps
steps := []multistep.Step{
&awscommon.StepPreValidate{
DestAmiName: b.config.AMIName,
ForceDeregister: b.config.AMIForceDeregister,
},
&awscommon.StepSourceAMIInfo{
SourceAmi: b.config.SourceAmi,
EnhancedNetworking: b.config.AMIEnhancedNetworking,
},
&awscommon.StepKeyPair{
Debug: b.config.PackerDebug,
DebugKeyPath: fmt.Sprintf("ec2_%s.pem", b.config.PackerBuildName),
KeyPairName: b.config.SSHKeyPairName,
PrivateKeyFile: b.config.RunConfig.Comm.SSHPrivateKey,
TemporaryKeyPairName: b.config.TemporaryKeyPairName,
},
&awscommon.StepSecurityGroup{
CommConfig: &b.config.RunConfig.Comm,
SecurityGroupIds: b.config.SecurityGroupIds,
VpcId: b.config.VpcId,
},
&awscommon.StepRunSourceInstance{
Debug: b.config.PackerDebug,
SpotPrice: b.config.SpotPrice,
SpotPriceProduct: b.config.SpotPriceAutoProduct,
InstanceType: b.config.InstanceType,
IamInstanceProfile: b.config.IamInstanceProfile,
UserData: b.config.UserData,
UserDataFile: b.config.UserDataFile,
SourceAMI: b.config.SourceAmi,
SubnetId: b.config.SubnetId,
AssociatePublicIpAddress: b.config.AssociatePublicIpAddress,
EbsOptimized: b.config.EbsOptimized,
AvailabilityZone: b.config.AvailabilityZone,
BlockDevices: b.config.BlockDevices,
Tags: b.config.RunTags,
},
&awscommon.StepGetPassword{
Debug: b.config.PackerDebug,
Comm: &b.config.RunConfig.Comm,
Timeout: b.config.WindowsPasswordTimeout,
},
&communicator.StepConnect{
Config: &b.config.RunConfig.Comm,
Host: awscommon.SSHHost(
ec2conn,
b.config.SSHPrivateIp),
SSHConfig: awscommon.SSHConfig(
b.config.RunConfig.Comm.SSHUsername),
},
&common.StepProvision{},
&StepUploadX509Cert{},
&StepBundleVolume{
Debug: b.config.PackerDebug,
},
&StepUploadBundle{
Debug: b.config.PackerDebug,
},
&awscommon.StepDeregisterAMI{
ForceDeregister: b.config.AMIForceDeregister,
AMIName: b.config.AMIName,
},
&StepRegisterAMI{},
&awscommon.StepAMIRegionCopy{
AccessConfig: &b.config.AccessConfig,
Regions: b.config.AMIRegions,
Name: b.config.AMIName,
},
&awscommon.StepModifyAMIAttributes{
Description: b.config.AMIDescription,
Users: b.config.AMIUsers,
Groups: b.config.AMIGroups,
ProductCodes: b.config.AMIProductCodes,
},
&awscommon.StepCreateTags{
Tags: b.config.AMITags,
},
}
// 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.GetOk("error"); ok {
return nil, rawErr.(error)
}
// If there are no AMIs, then just return
if _, ok := state.GetOk("amis"); !ok {
return nil, nil
}
// Build the artifact and return it
artifact := &awscommon.Artifact{
Amis: state.Get("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()
}
}