packer-cn/post-processor/vagrant/util.go

146 lines
3.1 KiB
Go

package vagrant
import (
"archive/tar"
"compress/flate"
"compress/gzip"
"encoding/json"
"fmt"
"github.com/mitchellh/packer/packer"
"io"
"log"
"os"
"path/filepath"
)
// Copies a file by copying the contents of the file to another place.
func CopyContents(dst, src string) error {
srcF, err := os.Open(src)
if err != nil {
return err
}
defer srcF.Close()
dstDir, _ := filepath.Split(dst)
if dstDir != "" {
err := os.MkdirAll(dstDir, os.ModePerm)
if err != nil {
return err
}
}
dstF, err := os.Create(dst)
if err != nil {
return err
}
defer dstF.Close()
if _, err := io.Copy(dstF, srcF); err != nil {
return err
}
return nil
}
// DirToBox takes the directory and compresses it into a Vagrant-compatible
// box. This function does not perform checks to verify that dir is
// actually a proper box. This is an expected precondition.
func DirToBox(dst, dir string, ui packer.Ui, level int) error {
log.Printf("Turning dir into box: %s => %s", dir, dst)
// Make the containing directory, if it does not already exist
err := os.MkdirAll(filepath.Dir(dst), 0755)
if err != nil {
return err
}
dstF, err := os.Create(dst)
if err != nil {
return err
}
defer dstF.Close()
var dstWriter io.Writer = dstF
if level != flate.NoCompression {
log.Printf("Compressing with gzip compression level: %d", level)
gzipWriter, err := gzip.NewWriterLevel(dstWriter, level)
if err != nil {
return err
}
defer gzipWriter.Close()
dstWriter = gzipWriter
}
tarWriter := tar.NewWriter(dstWriter)
defer tarWriter.Close()
// This is the walk func that tars each of the files in the dir
tarWalk := func(path string, info os.FileInfo, prevErr error) error {
// If there was a prior error, return it
if prevErr != nil {
return prevErr
}
// Skip directories
if info.IsDir() {
log.Printf("Skipping directory '%s' for box '%s'", path, dst)
return nil
}
log.Printf("Box add: '%s' to '%s'", path, dst)
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
header, err := tar.FileInfoHeader(info, "")
if err != nil {
return err
}
// We have to set the Name explicitly because it is supposed to
// be a relative path to the root. Otherwise, the tar ends up
// being a bunch of files in the root, even if they're actually
// nested in a dir in the original "dir" param.
header.Name, err = filepath.Rel(dir, path)
if err != nil {
return err
}
if ui != nil {
ui.Message(fmt.Sprintf("Compressing: %s", header.Name))
}
if err := tarWriter.WriteHeader(header); err != nil {
return err
}
if _, err := io.Copy(tarWriter, f); err != nil {
return err
}
return nil
}
// Tar.gz everything up
return filepath.Walk(dir, tarWalk)
}
// WriteMetadata writes the "metadata.json" file for a Vagrant box.
func WriteMetadata(dir string, contents interface{}) error {
if _, err := os.Stat(filepath.Join(dir, "metadata.json")); os.IsNotExist(err) {
f, err := os.Create(filepath.Join(dir, "metadata.json"))
if err != nil {
return err
}
defer f.Close()
enc := json.NewEncoder(f)
return enc.Encode(contents)
}
return nil
}