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post-processor.go
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/
post-processor.go
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package main
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"math"
"os"
"path"
"strings"
"time"
"github.com/mitchellh/goamz/aws"
"github.com/mitchellh/goamz/s3"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/helper/config"
"github.com/mitchellh/packer/packer"
"github.com/mitchellh/packer/template/interpolate"
)
type Config struct {
Region string `mapstructure:"region"`
Bucket string `mapstructure:"bucket"`
ManifestPath string `mapstructure:"manifest"`
BoxName string `mapstructure:"box_name"`
BoxDir string `mapstructure:"box_dir"`
Version string `mapstructure:"version"`
ACL s3.ACL `mapstructure:"acl"`
AccessKey string `mapstructure:"access_key_id"`
SecretKey string `mapstructure:"secret_key"`
SignedExpiry time.Duration `mapstructure:"signed_expiry"`
common.PackerConfig `mapstructure:",squash"`
ctx interpolate.Context
}
type PostProcessor struct {
config Config
s3 *s3.Bucket
}
func (p *PostProcessor) Configure(raws ...interface{}) error {
err := config.Decode(&p.config, &config.DecodeOpts{
Interpolate: true,
InterpolateContext: &p.config.ctx,
InterpolateFilter: &interpolate.RenderFilter{
Exclude: []string{"output"},
},
}, raws...)
if err != nil {
return err
}
errs := new(packer.MultiError)
// required configuration
templates := map[string]*string{
"region": &p.config.Region,
"bucket": &p.config.Bucket,
"manifest": &p.config.ManifestPath,
"box_name": &p.config.BoxName,
"box_dir": &p.config.BoxDir,
"version": &p.config.Version,
}
for key, ptr := range templates {
if *ptr == "" {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("vagrant-s3 %s must be set", key))
}
}
// Template process
for key, ptr := range templates {
if err = interpolate.Validate(*ptr, &p.config.ctx); err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Error parsing %s template: %s", key, err))
}
}
auth, err := aws.GetAuth(p.config.AccessKey, p.config.SecretKey)
if err != nil {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("Unable to create Aws Authentication. Try providing keys 'access_key_id' and 'secret_key'"))
}
// determine region
region, valid := aws.Regions[p.config.Region]
if valid {
p.s3 = s3.New(auth, region).Bucket(p.config.Bucket)
} else {
errs = packer.MultiErrorAppend(errs, fmt.Errorf("Invalid region specified: %s", p.config.Region))
}
if p.config.ACL == "" {
p.config.ACL = "public-read"
}
if len(errs.Errors) > 0 {
return errs
}
return nil
}
func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, bool, error) {
// Only accept input from the vagrant post-processor
if artifact.BuilderId() != "mitchellh.post-processor.vagrant" {
return nil, false, fmt.Errorf("Unknown artifact type, requires box from vagrant post-processor: %s", artifact.BuilderId())
}
// Assume there is only one .box file to upload
box := artifact.Files()[0]
if !strings.HasSuffix(box, ".box") {
return nil, false, fmt.Errorf("Unknown files in artifact from vagrant post-processor: %s", artifact.Files())
}
provider := providerFromBuilderName(artifact.Id())
ui.Say(fmt.Sprintf("Preparing to upload box for '%s' provider to S3 bucket '%s'", provider, p.config.Bucket))
// open the box so we can upload to S3 and calculate checksum for the manifest
file, err := os.Open(box)
if err != nil {
return nil, false, err
}
defer file.Close()
// get the file's size
info, err := file.Stat()
if err != nil {
return nil, false, err
}
size := info.Size()
ui.Message(fmt.Sprintf("Box to upload: %s (%d bytes)", box, size))
// generate the path to store the box in S3
boxPath := fmt.Sprintf("%s/%s/%s", p.config.BoxDir, p.config.Version, path.Base(box))
ui.Message("Generating checksum")
checksum, err := sum256(file)
if err != nil {
return nil, false, err
}
ui.Message(fmt.Sprintf("Checksum is %s", checksum))
// upload the box to S3 (rewinding as we already read the file to generate the checksum)
ui.Message(fmt.Sprintf("Uploading box to S3: %s", boxPath))
if _, err := file.Seek(0, 0); err != nil {
return nil, false, err
}
if size > 100*1024*1024 {
ui.Message("File size > 100MB. Initiating multipart upload")
multi, err := p.s3.InitMulti(boxPath, "application/octet-stream", p.config.ACL)
if err != nil {
return nil, false, err
}
ui.Message("Uploading...")
const chunkSize = 5 * 1024 * 1024
totalParts := int(math.Ceil(float64(size) / float64(chunkSize)))
totalUploadSize := int64(0)
parts := make([]s3.Part, totalParts)
errorCount := 0
for partNum := int(1); partNum <= totalParts; partNum++ {
filePos, err := file.Seek(0, 1)
partSize := int64(math.Min(chunkSize, float64(size-filePos)))
partBuffer := make([]byte, partSize)
ui.Message(fmt.Sprintf("Upload: Uploading part %d of %d, %d (of max %d) bytes", partNum, int(totalParts), int(partSize), int(chunkSize)))
readBytes, err := file.Read(partBuffer)
ui.Message(fmt.Sprintf("Upload: Read %d bytes from box file on disk", readBytes))
bufferReader := bytes.NewReader(partBuffer)
part, err := multi.PutPart(partNum, bufferReader)
parts[partNum-1] = part
if err != nil {
if errorCount < 10 {
errorCount++
ui.Message(fmt.Sprintf("Error encountered! %s. Retry %d.", err, errorCount))
time.Sleep(5 * time.Second)
//reset seek position to the beginning of this block
file.Seek(filePos, 0)
partNum--
} else {
ui.Message(fmt.Sprintf("Too many errors encountered! Aborting.", err, errorCount))
return nil, false, err
}
} else {
totalUploadSize += part.Size
ui.Message(fmt.Sprintf("Upload: Finished part %d of %d, upload total is %d bytes. This part was %d bytes.", partNum, totalParts, int(totalUploadSize), int(part.Size)))
}
}
ui.Message("Parts uploaded, completing upload...")
if err := multi.Complete(parts); err != nil {
return nil, false, err
}
} else {
if err := p.s3.PutReader(boxPath, file, size, "application/octet-stream", p.config.ACL); err != nil {
return nil, false, err
}
}
// get the latest manifest so we can add to it
ui.Message("Fetching latest manifest")
manifest, err := p.getManifest()
if err != nil {
return nil, false, err
}
ui.Message(fmt.Sprintf("Adding %s %s box to manifest", provider, p.config.Version))
var url string
if p.config.SignedExpiry == 0 {
url = p.s3.URL(boxPath)
} else {
url = p.s3.SignedURL(boxPath, time.Now().Add(p.config.SignedExpiry))
}
if err := manifest.add(p.config.Version, &Provider{
Name: provider,
Url: url,
ChecksumType: "sha256",
Checksum: checksum,
}); err != nil {
return nil, false, err
}
ui.Message(fmt.Sprintf("Uploading the manifest: %s", p.config.ManifestPath))
if err := p.putManifest(manifest); err != nil {
return nil, false, err
}
return &Artifact{p.s3.URL(p.config.ManifestPath)}, true, nil
}
func (p *PostProcessor) getManifest() (*Manifest, error) {
body, err := p.s3.GetReader(p.config.ManifestPath)
if err != nil {
s3Err, ok := err.(*s3.Error)
if ok && s3Err.Code == "NoSuchKey" {
return &Manifest{Name: p.config.BoxName}, nil
}
return nil, err
}
defer body.Close()
manifest := &Manifest{}
if err := json.NewDecoder(body).Decode(manifest); err != nil {
return nil, err
}
return manifest, nil
}
func (p *PostProcessor) putManifest(manifest *Manifest) error {
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(manifest); err != nil {
return err
}
if err := p.s3.Put(p.config.ManifestPath, buf.Bytes(), "application/json", p.config.ACL); err != nil {
return err
}
return nil
}
// calculates a sha256 checksum of the file
func sum256(file *os.File) (string, error) {
h := sha256.New()
if _, err := io.Copy(h, file); err != nil {
return "", err
}
return hex.EncodeToString(h.Sum(nil)), nil
}
// converts a packer builder name to the corresponding vagrant provider
func providerFromBuilderName(name string) string {
switch name {
case "aws":
return "aws"
case "digitalocean":
return "digitalocean"
case "virtualbox":
return "virtualbox"
case "vmware":
return "vmware_desktop"
case "parallels":
return "parallels"
default:
return name
}
}