2013-07-29 19:42:35 -04:00
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// The chroot package is able to create an Amazon AMI without requiring
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// the launch of a new instance for every build. It does this by attaching
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// and mounting the root volume of another AMI and chrooting into that
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// directory. It then creates an AMI from that attached drive.
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package chroot
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import (
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"github.com/mitchellh/goamz/ec2"
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"github.com/mitchellh/multistep"
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awscommon "github.com/mitchellh/packer/builder/amazon/common"
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"github.com/mitchellh/packer/builder/common"
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"github.com/mitchellh/packer/packer"
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"log"
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)
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// The unique ID for this builder
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const BuilderId = "mitchellh.amazon.chroot"
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// Config is the configuration that is chained through the steps and
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// settable from the template.
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type Config struct {
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common.PackerConfig `mapstructure:",squash"`
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awscommon.AccessConfig `mapstructure:",squash"`
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SourceAmi string `mapstructure:"source_ami"`
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}
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type Builder struct {
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config Config
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runner multistep.Runner
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}
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func (b *Builder) Prepare(raws ...interface{}) error {
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md, err := common.DecodeConfig(&b.config, raws...)
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if err != nil {
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return err
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}
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// Defaults
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// Accumulate any errors
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errs := common.CheckUnusedConfig(md)
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errs = packer.MultiErrorAppend(errs, b.config.AccessConfig.Prepare()...)
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if errs != nil && len(errs.Errors) > 0 {
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return errs
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}
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log.Printf("Config: %+v", b.config)
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return nil
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}
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func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packer.Artifact, error) {
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region, err := b.config.Region()
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if err != nil {
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return nil, err
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}
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auth, err := b.config.AccessConfig.Auth()
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if err != nil {
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return nil, err
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}
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ec2conn := ec2.New(auth, region)
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// Setup the state bag and initial state for the steps
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state := make(map[string]interface{})
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state["config"] = &b.config
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state["ec2"] = ec2conn
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state["hook"] = hook
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state["ui"] = ui
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// Build the steps
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steps := []multistep.Step{
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&StepCheckEC2{},
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&StepSourceAMIInfo{},
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&StepCreateVolume{},
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}
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2013-07-29 19:42:35 -04:00
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// Run!
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if b.config.PackerDebug {
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b.runner = &multistep.DebugRunner{
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Steps: steps,
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PauseFn: common.MultistepDebugFn(ui),
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}
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} else {
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b.runner = &multistep.BasicRunner{Steps: steps}
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}
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b.runner.Run(state)
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// If there was an error, return that
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if rawErr, ok := state["error"]; ok {
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return nil, rawErr.(error)
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}
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// If there are no AMIs, then just return
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if _, ok := state["amis"]; !ok {
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return nil, nil
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}
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// Build the artifact and return it
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artifact := &awscommon.Artifact{
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Amis: state["amis"].(map[string]string),
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BuilderIdValue: BuilderId,
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Conn: ec2conn,
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}
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return artifact, nil
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}
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func (b *Builder) Cancel() {
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if b.runner != nil {
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log.Println("Cancelling the step runner...")
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b.runner.Cancel()
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}
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}
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