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builder.go
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builder.go
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// The chroot package is able to create an Amazon AMI without requiring
// the launch of a new instance for every build. It does this by attaching
// and mounting the root volume of another AMI and chrooting into that
// directory. It then creates an AMI from that attached drive.
package chroot
import (
"errors"
"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"
"runtime"
)
// The unique ID for this builder
const BuilderId = "mitchellh.amazon.chroot"
// 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"`
ChrootMounts [][]string `mapstructure:"chroot_mounts"`
CopyFiles []string `mapstructure:"copy_files"`
DevicePath string `mapstructure:"device_path"`
MountCommand string `mapstructure:"mount_command"`
MountPath string `mapstructure:"mount_path"`
SourceAmi string `mapstructure:"source_ami"`
UnmountCommand string `mapstructure:"unmount_command"`
tpl *packer.ConfigTemplate
}
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 = packer.NewConfigTemplate()
if err != nil {
return err
}
b.config.tpl.UserVars = b.config.PackerUserVars
// Defaults
if b.config.ChrootMounts == nil {
b.config.ChrootMounts = make([][]string, 0)
}
if b.config.CopyFiles == nil {
b.config.CopyFiles = make([]string, 0)
}
if len(b.config.ChrootMounts) == 0 {
b.config.ChrootMounts = [][]string{
[]string{"proc", "proc", "/proc"},
[]string{"sysfs", "sysfs", "/sys"},
[]string{"bind", "/dev", "/dev"},
[]string{"devpts", "devpts", "/dev/pts"},
[]string{"binfmt_misc", "binfmt_misc", "/proc/sys/fs/binfmt_misc"},
}
}
if len(b.config.CopyFiles) == 0 {
b.config.CopyFiles = []string{"/etc/resolv.conf"}
}
if b.config.MountCommand == "" {
b.config.MountCommand = "mount"
}
if b.config.MountPath == "" {
b.config.MountPath = "packer-amazon-chroot-volumes/{{.Device}}"
}
if b.config.UnmountCommand == "" {
b.config.UnmountCommand = "umount"
}
// 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)...)
for i, mounts := range b.config.ChrootMounts {
if len(mounts) != 3 {
errs = packer.MultiErrorAppend(
errs, errors.New("Each chroot_mounts entry should be three elements."))
break
}
for j, entry := range mounts {
b.config.ChrootMounts[i][j], err = b.config.tpl.Process(entry, nil)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("Error processing chroot_mounts[%d][%d]: %s",
i, j, err))
}
}
}
for i, file := range b.config.CopyFiles {
var err error
b.config.CopyFiles[i], err = b.config.tpl.Process(file, nil)
if err != nil {
errs = packer.MultiErrorAppend(errs,
fmt.Errorf("Error processing copy_files[%d]: %s",
i, err))
}
}
if b.config.SourceAmi == "" {
errs = packer.MultiErrorAppend(errs, errors.New("source_ami is required."))
}
templates := map[string]*string{
"device_path": &b.config.DevicePath,
"mount_command": &b.config.MountCommand,
"source_ami": &b.config.SourceAmi,
"unmount_command": &b.config.UnmountCommand,
}
for n, ptr := range templates {
var err error
*ptr, err = b.config.tpl.Process(*ptr, nil)
if err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Error processing %s: %s", n, err))
}
}
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) {
if runtime.GOOS != "linux" {
return nil, errors.New("The amazon-chroot builder only works on Linux environments.")
}
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{
&StepInstanceInfo{},
&StepSourceAMIInfo{},
&StepFlock{},
&StepPrepareDevice{},
&StepCreateVolume{},
&StepAttachVolume{},
&StepEarlyUnflock{},
&StepMountDevice{},
&StepMountExtra{},
&StepCopyFiles{},
&StepChrootProvision{},
&StepEarlyCleanup{},
&StepSnapshot{},
&StepRegisterAMI{},
&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()
}
}