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virtualbox.go
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virtualbox.go
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package vagrant
import (
"archive/tar"
"errors"
"fmt"
"github.com/hashicorp/packer/packer"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"regexp"
)
type VBoxProvider struct{}
func (p *VBoxProvider) KeepInputArtifact() bool {
return false
}
func (p *VBoxProvider) Process(ui packer.Ui, artifact packer.Artifact, dir string) (vagrantfile string, metadata map[string]interface{}, err error) {
// Create the metadata
metadata = map[string]interface{}{"provider": "virtualbox"}
// 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
}
} else {
ui.Message(fmt.Sprintf("Copying from artifact: %s", path))
dstPath := filepath.Join(dir, filepath.Base(path))
if err = CopyContents(dstPath, path); err != nil {
return
}
}
}
// 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
}
// Create the Vagrantfile from the template
var baseMacAddress string
baseMacAddress, err = p.findBaseMacAddress(dir)
if err != nil {
return
}
vagrantfile = fmt.Sprintf(vboxVagrantfile, baseMacAddress)
return
}
func (p *VBoxProvider) 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 *VBoxProvider) 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 *VBoxProvider) 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 vboxVagrantfile = `
Vagrant.configure("2") do |config|
config.vm.base_mac = "%s"
end
`