/*
handle - Pointer to a Tar file being built
rootPath - Path to read the contents from
relPath - Path to write these files into
*/
func writeFile(handle *tar.Writer, rootPath, relPath string) error {
var file *os.File
var stat os.FileInfo
var buffer []byte
var err error
if file, err = os.OpenFile(rootPath, os.O_RDONLY, os.ModePerm); err != nil {
return err
}
if stat, err = file.Stat(); err != nil {
return err
}
file.Close()
header := &tar.Header{
Name: relPath,
Size: stat.Size(),
}
if err := handle.WriteHeader(header); err != nil {
return err
}
if buffer, err = ioutil.ReadFile(rootPath); err != nil {
return err
}
if _, err := handle.Write(buffer); err != nil {
return err
}
return nil
}
func (c *PackCmd) packLib(writer *tar.Writer, dir string) error {
// these should be of the form $GOOS_$GOARCH
name := fmt.Sprintf("pkg/%s/%s%s", dir, c.Paths.PkgName, GO_LIB_EXT)
fname := os.ExpandEnv("$GOPATH/") + name
c.log.Logv("Looking for %s", fname)
file, err := os.Open(fname)
if err != nil {
return err
}
defer file.Close()
body, err := ioutil.ReadAll(file)
if err != nil {
panic(err)
}
header := tar.Header{
Name: name,
Mode: 0444,
Size: int64(len(body)),
}
writer.WriteHeader(&header)
writer.Write(body)
return nil
}
func appendLink(tw *tar.Writer, tfh io.Seeker, fn string) (pos1 uint64, pos2 uint64, err error) {
if !fileIsSymlink(fn) {
return appendFile(tw, tfh, fn)
}
logger.Tracef("adding link %s (%s) to %s", tfh, fn, tw)
hdr, e := FileTarHeader(fn)
hdr.Size = 0
hdr.Typeflag = tar.TypeSymlink
hdr.Linkname = BaseName(FindLinkOrigin(fn, false))
// logger.Printf("fn=%s hdr=%+v tm=%s", fn, hdr, hdr.Typeflag)
if e != nil {
err = e
return
}
p, e := tfh.Seek(0, 1)
if e != nil {
err = e
return
}
pos1 = uint64(p)
if err = WriteTar(tw, hdr, nil); err != nil {
return
}
_ = tw.Flush()
if p, err = tfh.Seek(0, 1); err != nil {
return
}
pos2 = uint64(p)
return
}
//WriteGopathSrc tars up files under gopath src
func WriteGopathSrc(tw *tar.Writer, excludeDir string) error {
gopath := os.Getenv("GOPATH")
// Only take the first element of GOPATH
gopath = filepath.SplitList(gopath)[0]
rootDirectory := filepath.Join(gopath, "src")
vmLogger.Infof("rootDirectory = %s", rootDirectory)
if err := WriteFolderToTarPackage(tw, rootDirectory, excludeDir, includeFileTypes, nil); err != nil {
vmLogger.Errorf("Error writing folder to tar package %s", err)
return err
}
// Add the certificates to tar
if viper.GetBool("peer.tls.enabled") {
err := WriteFileToPackage(viper.GetString("peer.tls.cert.file"), "src/certs/cert.pem", tw)
if err != nil {
return fmt.Errorf("Error writing cert file to package: %s", err)
}
}
// Write the tar file out
if err := tw.Close(); err != nil {
return err
}
//ioutil.WriteFile("/tmp/chaincode_deployment.tar", inputbuf.Bytes(), 0644)
return nil
}
func writeEndOfTarStreamHeader(tarWriter *tar.Writer) {
hdr := &tar.Header{
Name: END_OF_TAR_FILENAME,
}
err := tarWriter.WriteHeader(hdr)
CheckError(err)
}
func addFileToTar(fileWriter *os.File, tarWriter *tar.Writer, info os.FileInfo, containingPath string, fullPath string) error {
var (
relpath string
err error
)
if relpath, err = filepath.Rel(containingPath, fullPath); err != nil {
return err
}
if relpath == fileWriter.Name() || relpath == "." || relpath == ".." {
return nil
}
if h, _ := tar.FileInfoHeader(info, fullPath); h != nil {
h.Name = relpath
if err := tarWriter.WriteHeader(h); err != nil {
return err
}
}
if !info.IsDir() {
fr, err := os.Open(fullPath)
if err != nil {
return err
}
defer fr.Close()
if _, err := io.Copy(tarWriter, fr); err != nil {
return err
}
}
return nil
}
// copyFile copies src to tar file dst.
func copyFile(tw *tar.Writer, dst, src string) error {
s, err := os.Open(src)
if err != nil {
return fmt.Errorf("unable to open %v: %v", src, err)
}
defer s.Close()
fi, err := s.Stat()
if err != nil {
return fmt.Errorf("unable to stat %v: %v", src, err)
}
hdr, err := tar.FileInfoHeader(fi, dst)
if err != nil {
return fmt.Errorf("unable to create tar header for %v: %v", dst, err)
}
hdr.Name = dst
if err := tw.WriteHeader(hdr); err != nil {
return fmt.Errorf("unable to write header for %v: %v", dst, err)
}
_, err = io.Copy(tw, s)
if err != nil {
return fmt.Errorf("unable to copy %v to %v: %v", src, dst, err)
}
return nil
}
func addFileToTarWriter(filePath string, tarWriter *tar.Writer) error {
file, err := os.Open(filePath)
if err != nil {
return errors.New(fmt.Sprintf("Could not open file '%s', got error '%s'", filePath, err.Error()))
}
defer file.Close()
stat, err := file.Stat()
if err != nil {
return errors.New(fmt.Sprintf("Could not get stat for file '%s', got error '%s'", filePath, err.Error()))
}
header := &tar.Header{
Name: filePath,
Size: stat.Size(),
Mode: int64(stat.Mode()),
ModTime: stat.ModTime(),
}
err = tarWriter.WriteHeader(header)
if err != nil {
return errors.New(fmt.Sprintf("Could not write header for file '%s', got error '%s'", filePath, err.Error()))
}
_, err = io.Copy(tarWriter, file)
if err != nil {
return errors.New(fmt.Sprintf("Could not copy the file '%s' data to the tarball, got error '%s'", filePath, err.Error()))
}
return nil
}
func targzWrite(tarWriter *tar.Writer, h *tar.Header, r io.Reader) {
err := tarWriter.WriteHeader(h)
panicOnError(err, "Failed to write tar entry header")
_, err = io.Copy(tarWriter, r)
panicOnError(err, "Failed to copy")
}
// Writes the given file into tarfn
func writeItem(tarfn string, fn string) (pos uint64, err error) {
pos = 0
sfh, err := os.Open(fn)
defer sfh.Close()
if sfi, err := sfh.Stat(); err == nil {
hdr := new(tar.Header)
hdr.Name = sfi.Name()
hdr.Size = sfi.Size()
hdr.Mode = int64(sfi.Mode().Perm())
hdr.ModTime = sfi.ModTime()
var (
tw *tar.Writer
f ReadWriteSeekCloser
)
if tw, f, pos, err = OpenForAppend(tarfn); err == nil {
defer f.Close()
defer tw.Close() //LIFO
if err := tw.WriteHeader(hdr); err == nil {
if zw, err := gzip.NewWriterLevel(tw, flate.BestCompression); err == nil {
defer zw.Close()
_, err = io.Copy(zw, sfh)
}
}
}
}
return
}
func targzWalk(dirPath string, tw *tar.Writer) {
var walkfunc filepath.WalkFunc
walkfunc = func(path string, fi os.FileInfo, err error) error {
h, err := tar.FileInfoHeader(fi, "")
handleError(err)
h.Name = "./app/" + path
if fi.Mode()&os.ModeSymlink != 0 {
linkPath, err := os.Readlink(path)
handleError(err)
h.Linkname = linkPath
}
err = tw.WriteHeader(h)
handleError(err)
if fi.Mode()&os.ModeDir == 0 && fi.Mode()&os.ModeSymlink == 0 {
fr, err := os.Open(path)
handleError(err)
defer fr.Close()
_, err = io.Copy(tw, fr)
handleError(err)
}
return nil
}
filepath.Walk(dirPath, walkfunc)
}
func recursiveTar(base, file string, tw *tar.Writer) error {
filepath := path.Join(base, file)
stat, err := os.Stat(filepath)
if err != nil {
return err
}
if stat.IsDir() {
files, err := ioutil.ReadDir(filepath)
if err != nil {
return err
}
for _, f := range files {
if err := recursiveTar(base, path.Join(file, f.Name()), tw); err != nil {
return err
}
}
return nil
}
hdr, err := tar.FileInfoHeader(stat, filepath)
if err != nil {
return err
}
hdr.Name = file
if err := tw.WriteHeader(hdr); err != nil {
return err
}
f, err := os.Open(filepath)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(tw, f)
return err
}
func (c *PackCmd) packSource(writer *tar.Writer, p *utils.Paths) error {
base := path.Join(p.SrcDir, p.PkgName)
files, err := ioutil.ReadDir(base)
if err != nil {
return err
}
for _, file := range files {
if !file.IsDir() && strings.HasSuffix(file.Name(), ".go") {
fpath := path.Join(base, file.Name())
src, err := ioutil.ReadFile(fpath)
if err != nil {
return err
}
src, err = source.Prune(src)
header := tar.Header{
Name: fmt.Sprintf("src/%s/%s", p.PkgName, file.Name()),
Mode: 0444,
Size: int64(len(src)),
}
writer.WriteHeader(&header)
writer.Write(src)
}
}
return nil
}
// WritePackage satisfies the platform interface for generating a docker package
// that encapsulates the environment for a CAR based chaincode
func (carPlatform *Platform) WritePackage(spec *pb.ChaincodeSpec, tw *tar.Writer) error {
path, err := download(spec.ChaincodeID.Path)
if err != nil {
return err
}
var buf []string
//let the executable's name be chaincode ID's name
buf = append(buf, cutil.GetDockerfileFromConfig("chaincode.car.Dockerfile"))
buf = append(buf, "COPY package.car /tmp/package.car")
// invoking directly for maximum JRE compatiblity
buf = append(buf, fmt.Sprintf("RUN java -jar /usr/local/bin/chaintool buildcar /tmp/package.car -o $GOPATH/bin/%s && rm /tmp/package.car", spec.ChaincodeID.Name))
dockerFileContents := strings.Join(buf, "\n")
dockerFileSize := int64(len([]byte(dockerFileContents)))
//Make headers identical by using zero time
var zeroTime time.Time
tw.WriteHeader(&tar.Header{Name: "Dockerfile", Size: dockerFileSize, ModTime: zeroTime, AccessTime: zeroTime, ChangeTime: zeroTime})
tw.Write([]byte(dockerFileContents))
err = cutil.WriteFileToPackage(path, "package.car", tw)
if err != nil {
return err
}
return nil
}
func addFile(writer *tar.Writer, filepath string) error {
f, err := os.Open(filepath)
if err != nil {
return err
}
defer f.Close()
fi, err := os.Lstat(filepath)
if err != nil {
return err
}
if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
target, err := os.Readlink(filepath)
if err != nil {
return err
}
return addSymlink(writer, filepath, target)
}
header, err := tar.FileInfoHeader(fi, "")
if err != nil {
return err
}
header.Name = filepath
err = writer.WriteHeader(header)
if err != nil {
return err
}
n, err := io.Copy(writer, f)
if err != nil {
return err
}
if n != fi.Size() {
return io.ErrShortWrite
}
return nil
}
func saveWalk(srcBasePath string, tw *tar.Writer, filterset filter.FilterSet, bucket fshash.Bucket, hasherFactory func() hash.Hash) error {
preVisit := func(filenode *fs.FilewalkNode) error {
if filenode.Err != nil {
return filenode.Err
}
hdr, file := fs.ScanFile(srcBasePath, filenode.Path, filenode.Info)
// apply filters. on scans, this is pretty easy, all of em just apply to the stream in memory.
hdr = filterset.Apply(hdr)
// flaten time to seconds. this tar writer impl doesn't do subsecond precision.
// the writer will flatten it internally of course, but we need to do it here as well
// so that the hash and the serial form are describing the same thing.
hdr.ModTime = hdr.ModTime.Truncate(time.Second)
wat := tar.Header(hdr) // this line is... we're not gonna talk about this.
tw.WriteHeader(&wat)
if file == nil {
bucket.Record(hdr, nil)
} else {
defer file.Close()
hasher := hasherFactory()
tee := io.MultiWriter(tw, hasher)
_, err := io.Copy(tee, file)
if err != nil {
return err
}
bucket.Record(hdr, hasher.Sum(nil))
}
return nil
}
return fs.Walk(srcBasePath, preVisit, nil)
}
func writeTarGz(filePath, baseDir string, tarGzWriter *tar.Writer, fileInfo os.FileInfo) error {
file, err := os.Open(filePath)
if err != nil {
return err
}
defer file.Close()
relativePath, err := filepath.Rel(baseDir, filePath)
if err != nil {
return err
}
header := new(tar.Header)
header.Name = relativePath
header.Size = fileInfo.Size()
header.Mode = int64(fileInfo.Mode())
header.ModTime = fileInfo.ModTime()
err = tarGzWriter.WriteHeader(header)
if err != nil {
return err
}
_, err = io.Copy(tarGzWriter, file)
if err != nil {
return err
}
return nil
}
// 因为要在 defer 中关闭文件，所以要单独创建一个函数
func tarFile(srcBase, srcRelative string, tw *tar.Writer, fi os.FileInfo) (err error) {
// 获取完整路径
srcFull := srcBase + srcRelative
// 写入文件信息
hdr, er := tar.FileInfoHeader(fi, "")
if er != nil {
return er
}
hdr.Name = srcRelative
if er = tw.WriteHeader(hdr); er != nil {
return er
}
// 打开要打包的文件，准备读取
fr, er := os.Open(srcFull)
if er != nil {
return er
}
defer fr.Close()
// 将文件数据写入 tw 中
if _, er = io.Copy(tw, fr); er != nil {
return er
}
return nil
}
// synthesizeMain generates a new main func and writes it to the tarball.
func synthesizeMain(tw *tar.Writer, appFiles []string) error {
appMap := make(map[string]bool)
for _, f := range appFiles {
appMap[f] = true
}
var f string
for i := 0; i < 100; i++ {
f = fmt.Sprintf("app_main%d.go", i)
if !appMap[filepath.Join(*rootDir, f)] {
break
}
}
if appMap[filepath.Join(*rootDir, f)] {
return fmt.Errorf("unable to find unique name for %v", f)
}
hdr := &tar.Header{
Name: f,
Mode: 0644,
Size: int64(len(newMain)),
}
if err := tw.WriteHeader(hdr); err != nil {
return fmt.Errorf("unable to write header for %v: %v", f, err)
}
if _, err := tw.Write([]byte(newMain)); err != nil {
return fmt.Errorf("unable to write %v to tar file: %v", f, err)
}
return nil
}
//compress the file (if compress to the zip file , using the similar package: zip.FileInfoHeader)
func Filecompress(tw *tar.Writer, dir string, fi os.FileInfo) error {
//打开文件 open当中是 目录名称/文件名称 构成的组合
log.Println(dir + fi.Name())
fr, err := os.Open(dir + fi.Name())
log.Println(fr.Name())
if err != nil {
return err
}
defer fr.Close()
hdr, err := tar.FileInfoHeader(fi, "")
hdr.Name = fr.Name()
if err = tw.WriteHeader(hdr); err != nil {
return err
}
_, err = io.Copy(tw, fr)
if err != nil {
return err
}
//打印文件名称
log.Println("add the file: " + fi.Name())
return nil
}
func WriteToTar(tarWriter *tar.Writer, file *TarFile) error {
hdr, err := tar.FileInfoHeader(file.Info, "")
if err != nil {
return fmt.Errorf("Unable to get tar FileInfoHeader of tar file '%s', error: %s", file.FileName, err.Error())
}
hdr.Name = file.FileName
if hdr.Xattrs == nil {
hdr.Xattrs = map[string]string{}
}
hdr.Xattrs["SIZE"] = fmt.Sprintf("%d", file.Info.Size())
if file.IsOnlyFile {
hdr.Xattrs["SINGLE_FILE_ONLY"] = "1"
}
err = tarWriter.WriteHeader(hdr)
if err != nil {
return fmt.Errorf("Unable to write tar header for file '%s', error: %s", file.FileName, err.Error())
}
if !file.HasContent() {
return nil
}
defer file.ContentReadCloser.Close()
_, err = io_throttler.CopyThrottled(io_throttler.DefaultIOThrottlingBandwidth, tarWriter, file.ContentReadCloser)
return err
}
func addFileToTar(fileWriter *os.File, tarWriter *tar.Writer, info os.FileInfo, relativePath, fullPath string) error {
if relativePath == fileWriter.Name() || relativePath == "." || relativePath == ".." {
return nil
}
if h, err := tar.FileInfoHeader(info, fullPath); err == nil {
h.Name = relativePath
if err := tarWriter.WriteHeader(h); err != nil {
return err
}
}
if info.IsDir() {
return nil
}
li, err := os.Lstat(fullPath)
if err != nil {
return err
}
if li.Mode()&os.ModeSymlink == os.ModeSymlink {
return nil
}
fr, err := os.Open(fullPath)
if err != nil {
return err
}
defer fr.Close()
if _, err := io.Copy(tarWriter, fr); err != nil {
return err
}
return nil
}
//WriteStreamToPackage writes bytes (from a file reader) to the tarball
func WriteStreamToPackage(is io.Reader, localpath string, packagepath string, tw *tar.Writer) error {
info, err := os.Stat(localpath)
if err != nil {
return fmt.Errorf("%s: %s", localpath, err)
}
header, err := tar.FileInfoHeader(info, localpath)
if err != nil {
return fmt.Errorf("Error getting FileInfoHeader: %s", err)
}
//Let's take the variance out of the tar, make headers identical by using zero time
oldname := header.Name
var zeroTime time.Time
header.AccessTime = zeroTime
header.ModTime = zeroTime
header.ChangeTime = zeroTime
header.Name = packagepath
if err = tw.WriteHeader(header); err != nil {
return fmt.Errorf("Error write header for (path: %s, oldname:%s,newname:%s,sz:%d) : %s", localpath, oldname, packagepath, header.Size, err)
}
if _, err := io.Copy(tw, is); err != nil {
return fmt.Errorf("Error copy (path: %s, oldname:%s,newname:%s,sz:%d) : %s", localpath, oldname, packagepath, header.Size, err)
}
return nil
}
// writeStdioSymlinks adds the /dev/stdin, /dev/stdout, /dev/stderr, and
// /dev/fd symlinks expected by Docker to the converted ACIs so apps can find
// them as expected
func writeStdioSymlinks(tarWriter *tar.Writer, fileMap map[string]struct{}, pwl []string) ([]string, error) {
stdioSymlinks := []symlink{
{"/dev/stdin", "/proc/self/fd/0"},
// Docker makes /dev/{stdout,stderr} point to /proc/self/fd/{1,2} but
// we point to /dev/console instead in order to support the case when
// stdout/stderr is a Unix socket (e.g. for the journal).
{"/dev/stdout", "/dev/console"},
{"/dev/stderr", "/dev/console"},
{"/dev/fd", "/proc/self/fd"},
}
for _, s := range stdioSymlinks {
name := s.linkname
target := s.target
if _, exists := fileMap[name]; exists {
continue
}
hdr := &tar.Header{
Name: filepath.Join("rootfs", name),
Mode: 0777,
Typeflag: tar.TypeSymlink,
Linkname: target,
}
if err := tarWriter.WriteHeader(hdr); err != nil {
return nil, err
}
if !util.In(pwl, name) {
pwl = append(pwl, name)
}
}
return pwl, nil
}
func tarDir(srcBase, srcRelative string, tw *tar.Writer, fi os.FileInfo) (err error) {
srcFull := srcBase + srcRelative
fis, er := ioutil.ReadDir(srcFull)
if er != nil {
return er
}
for _, fi := range fis {
if fi.IsDir() {
tarDir(srcBase, srcRelative+"/"+fi.Name(), tw, fi)
} else {
tarFile(srcBase, srcRelative+"/"+fi.Name(), tw, fi)
}
}
if len(srcRelative) > 0 {
hdr, er := tar.FileInfoHeader(fi, "")
if er != nil {
return er
}
hdr.Name = srcRelative
if er = tw.WriteHeader(hdr); er != nil {
return er
}
}
return nil
}
func addFile(filename string, tw *tar.Writer) error {
file, err := os.Open(filename)
if err != nil {
return fmt.Errorf("failed opening %s: %s", filename, err)
}
defer file.Close()
stat, err := file.Stat()
if err != nil {
return fmt.Errorf("failed file stat for %s: %s", filename, err)
}
hdr := &tar.Header{
ModTime: stat.ModTime(),
Name: filename,
Size: stat.Size(),
Mode: int64(stat.Mode().Perm()),
}
if err := tw.WriteHeader(hdr); err != nil {
return fmt.Errorf("failed writing tar header for %s: %s", filename, err)
}
copied, err := io.Copy(tw, file)
if err != nil {
return fmt.Errorf("failed writing %s to tar: %s", filename, err)
}
// Check copied, since we have the file stat with its size
if copied < stat.Size() {
return fmt.Errorf("wrote %d bytes of %s, expected to write %d", copied, filename, stat.Size())
}
return nil
}
// appends file to tar
func appendFile(tw *tar.Writer, tfh io.Seeker, fn string) (pos1 uint64, pos2 uint64, err error) {
logger.Tracef("adding %s (%s) to %s", tfh, fn, tw)
hdr, e := FileTarHeader(fn)
if e != nil {
err = e
return
}
sfh, e := os.Open(fn)
if e != nil {
err = e
return
}
defer sfh.Close()
p, e := tfh.Seek(0, 1)
if e != nil {
err = e
return
}
pos1 = uint64(p)
if err = WriteTar(tw, hdr, sfh); err != nil {
return
}
_ = tw.Flush()
if p, err = tfh.Seek(0, 1); err != nil {
return
}
pos2 = uint64(p)
return
}
func addDir(writer *tar.Writer, dirpath string) error {
dir, err := os.Open(dirpath)
if err != nil {
return err
}
defer dir.Close()
fi, err := dir.Stat()
if err != nil {
return err
}
header, err := tar.FileInfoHeader(fi, "")
if err != nil {
return err
}
header.Name = dirpath
err = writer.WriteHeader(header)
if err != nil {
return err
}
fis, err := dir.Readdir(0)
if err != nil {
return err
}
for _, fi := range fis {
if fi.IsDir() {
err = addDir(writer, path.Join(dirpath, fi.Name()))
} else {
err = addFile(writer, path.Join(dirpath, fi.Name()))
}
if err != nil {
return err
}
}
return nil
}
// writeTarHeader writes tar header for given file, returns error if operation fails
func (t *stiTar) writeTarHeader(tarWriter *tar.Writer, dir string, path string, info os.FileInfo, includeDirInPath bool) error {
var (
link string
err error
)
if info.Mode()&os.ModeSymlink != 0 {
link, err = os.Readlink(path)
if err != nil {
return err
}
}
header, err := tar.FileInfoHeader(info, link)
if err != nil {
return err
}
prefix := dir
if includeDirInPath {
prefix = filepath.Dir(prefix)
}
header.Name = filepath.ToSlash(path[1+len(prefix):])
glog.V(5).Infof("Adding to tar: %s as %s", path, header.Name)
if err = tarWriter.WriteHeader(header); err != nil {
return err
}
return nil
}
//tw is expected to have the chaincode in it from GenerateHashcode. This method
//will just package rest of the bytes
func writeChaincodePackage(spec *pb.ChaincodeSpec, tw *tar.Writer) error {
var urlLocation string
if strings.HasPrefix(spec.ChaincodeID.Path, "http://") {
urlLocation = spec.ChaincodeID.Path[7:]
} else if strings.HasPrefix(spec.ChaincodeID.Path, "https://") {
urlLocation = spec.ChaincodeID.Path[8:]
} else {
urlLocation = spec.ChaincodeID.Path
}
newRunLine := fmt.Sprintf("RUN go install %s && cp src/github.com/openblockchain/obc-peer/openchain.yaml $GOPATH/bin", urlLocation)
dockerFileContents := fmt.Sprintf("%s\n%s", viper.GetString("chaincode.golang.Dockerfile"), newRunLine)
dockerFileSize := int64(len([]byte(dockerFileContents)))
//Make headers identical by using zero time
var zeroTime time.Time
tw.WriteHeader(&tar.Header{Name: "Dockerfile", Size: dockerFileSize, ModTime: zeroTime, AccessTime: zeroTime, ChangeTime: zeroTime})
tw.Write([]byte(dockerFileContents))
err := writeGopathSrc(tw, urlLocation)
if err != nil {
return fmt.Errorf("Error writing Chaincode package contents: %s", err)
}
return nil
}