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virtualbox.go
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virtualbox.go
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package vagrant
import (
"archive/tar"
"compress/flate"
"errors"
"fmt"
"github.com/mitchellh/packer/common"
"github.com/mitchellh/packer/packer"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
"strconv"
)
type VBoxBoxConfig struct {
common.PackerConfig `mapstructure:",squash"`
OutputPath string `mapstructure:"output"`
VagrantfileTemplate string `mapstructure:"vagrantfile_template"`
CompressionLevel string `mapstructure:"compression_level"`
tpl *packer.ConfigTemplate
}
type VBoxVagrantfileTemplate struct {
BaseMacAddress string
}
type VBoxBoxPostProcessor struct {
config VBoxBoxConfig
}
func (p *VBoxBoxPostProcessor) Configure(raws ...interface{}) error {
md, err := common.DecodeConfig(&p.config, raws...)
if err != nil {
return err
}
p.config.tpl, err = packer.NewConfigTemplate()
if err != nil {
return err
}
p.config.tpl.UserVars = p.config.PackerUserVars
// Accumulate any errors
errs := common.CheckUnusedConfig(md)
validates := map[string]*string{
"output": &p.config.OutputPath,
"vagrantfile_template": &p.config.VagrantfileTemplate,
"compression_level": &p.config.CompressionLevel,
}
for n, ptr := range validates {
if err := p.config.tpl.Validate(*ptr); err != nil {
errs = packer.MultiErrorAppend(
errs, fmt.Errorf("Error parsing %s: %s", n, err))
}
}
if errs != nil && len(errs.Errors) > 0 {
return errs
}
return nil
}
func (p *VBoxBoxPostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, bool, error) {
var err error
// Compile the output path
outputPath, err := p.config.tpl.Process(p.config.OutputPath, &OutputPathTemplate{
ArtifactId: artifact.Id(),
BuildName: p.config.PackerBuildName,
Provider: "virtualbox",
})
if err != nil {
return nil, false, err
}
// Create a temporary directory for us to build the contents of the box in
dir, err := ioutil.TempDir("", "packer")
if err != nil {
return nil, false, err
}
defer os.RemoveAll(dir)
// Copy all of the original contents into the temporary directory
for _, path := range artifact.Files() {
// We treat OVA files specially, we unpack those into the temporary
// directory so we can get the resulting disk and OVF.
if extension := filepath.Ext(path); extension == ".ova" {
ui.Message(fmt.Sprintf("Unpacking OVA: %s", path))
if err := DecompressOva(dir, path); err != nil {
return nil, false, err
}
} else {
ui.Message(fmt.Sprintf("Copying: %s", path))
dstPath := filepath.Join(dir, filepath.Base(path))
if err := CopyContents(dstPath, path); err != nil {
return nil, false, err
}
}
}
// Create the Vagrantfile from the template
tplData := &VBoxVagrantfileTemplate{}
tplData.BaseMacAddress, err = p.findBaseMacAddress(dir)
if err != nil {
return nil, false, err
}
vf, err := os.Create(filepath.Join(dir, "Vagrantfile"))
if err != nil {
return nil, false, err
}
defer vf.Close()
vagrantfileContents := defaultVBoxVagrantfile
if p.config.VagrantfileTemplate != "" {
f, err := os.Open(p.config.VagrantfileTemplate)
if err != nil {
return nil, false, err
}
defer f.Close()
contents, err := ioutil.ReadAll(f)
if err != nil {
return nil, false, err
}
vagrantfileContents = string(contents)
}
vagrantfileContents, err = p.config.tpl.Process(vagrantfileContents, tplData)
if err != nil {
return nil, false, fmt.Errorf("Error writing Vagrantfile: %s", err)
}
vf.Write([]byte(vagrantfileContents))
vf.Close()
var level int = flate.DefaultCompression
if p.config.CompressionLevel != "" {
level, err = strconv.Atoi(p.config.CompressionLevel)
if err != nil {
return nil, false, err
}
}
// Create the metadata
metadata := map[string]string{"provider": "virtualbox"}
if err := WriteMetadata(dir, metadata); err != nil {
return nil, false, err
}
// Rename the OVF file to box.ovf, as required by Vagrant
ui.Message("Renaming the OVF to box.ovf...")
if err := p.renameOVF(dir); err != nil {
return nil, false, err
}
// Compress the directory to the given output path
ui.Message(fmt.Sprintf("Compressing box..."))
if err := DirToBox(outputPath, dir, ui, level); err != nil {
return nil, false, err
}
return NewArtifact("virtualbox", outputPath), false, nil
}
func (p *VBoxBoxPostProcessor) findOvf(dir string) (string, error) {
log.Println("Looking for OVF in artifact...")
file_matches, err := filepath.Glob(filepath.Join(dir, "*.ovf"))
if err != nil {
return "", err
}
if len(file_matches) > 1 {
return "", errors.New("More than one OVF file in VirtualBox artifact.")
}
if len(file_matches) < 1 {
return "", errors.New("ovf file couldn't be found")
}
return file_matches[0], err
}
func (p *VBoxBoxPostProcessor) renameOVF(dir string) error {
log.Println("Looking for OVF to rename...")
ovf, err := p.findOvf(dir)
if err != nil {
return err
}
log.Printf("Renaming: '%s' => box.ovf", ovf)
return os.Rename(ovf, filepath.Join(dir, "box.ovf"))
}
func (p *VBoxBoxPostProcessor) findBaseMacAddress(dir string) (string, error) {
log.Println("Looking for OVF for base mac address...")
ovf, err := p.findOvf(dir)
if err != nil {
return "", err
}
f, err := os.Open(ovf)
if err != nil {
return "", err
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return "", err
}
re := regexp.MustCompile(`<Adapter slot="0".+?MACAddress="(.+?)"`)
matches := re.FindSubmatch(data)
if matches == nil {
return "", errors.New("can't find base mac address in OVF")
}
log.Printf("Base mac address: %s", string(matches[1]))
return string(matches[1]), nil
}
// DecompressOva takes an ova file and decompresses it into the target
// directory.
func DecompressOva(dir, src string) error {
log.Printf("Turning ova to dir: %s => %s", src, dir)
srcF, err := os.Open(src)
if err != nil {
return err
}
defer srcF.Close()
tarReader := tar.NewReader(srcF)
for {
hdr, err := tarReader.Next()
if hdr == nil || err == io.EOF {
break
}
info := hdr.FileInfo()
// Shouldn't be any directories, skip them
if info.IsDir() {
continue
}
// We wrap this in an anonymous function so that the defers
// inside are handled more quickly so we can give up file handles.
err = func() error {
path := filepath.Join(dir, info.Name())
output, err := os.Create(path)
if err != nil {
return err
}
defer output.Close()
os.Chmod(path, info.Mode())
os.Chtimes(path, hdr.AccessTime, hdr.ModTime)
_, err = io.Copy(output, tarReader)
return err
}()
if err != nil {
return err
}
}
return nil
}
var defaultVBoxVagrantfile = `
Vagrant.configure("2") do |config|
config.vm.base_mac = "{{ .BaseMacAddress }}"
end
`