func (f *File) WriteTo(w io.Writer) error {
tw := tar.NewWriter(w)
hdr := new(tar.Header)
hdr.Name = "file.qvm"
hdr.Size = 32
if f.QvmFile.Header.Magic == qvm.VM_MAGIC_VER2 {
hdr.Size += 4
}
hdr.Size += int64(f.QvmFile.Header.CodeLength + f.QvmFile.Header.DataLength + f.QvmFile.Header.LitLength)
if err := tw.WriteHeader(hdr); err != nil {
return err
}
buf := new(Rab)
binary.Write(buf, binary.LittleEndian, &f.QvmFile.Header)
if _, err := tw.Write([]byte(*buf)[0:32]); err != nil {
return err
}
if f.QvmFile.Header.Magic == qvm.VM_MAGIC_VER2 {
if _, err := tw.Write([]byte(*buf)[32:]); err != nil {
return err
}
}
if _, err := tw.Write(f.QvmFile.Code); err != nil {
return err
}
if _, err := tw.Write(f.QvmFile.Data); err != nil {
return err
}
if _, err := tw.Write(f.QvmFile.Lit); err != nil {
return err
}
hdr.Name = "comments.csv"
hdr.Size = int64(len(f.CommentsFile.Data))
if err := tw.WriteHeader(hdr); err != nil {
return err
}
if _, err := tw.Write(f.CommentsFile.Data); err != nil {
return err
}
hdr.Name = "syscalls.asm"
hdr.Size = int64(len(f.SyscallsFile.Data))
if err := tw.WriteHeader(hdr); err != nil {
return err
}
if _, err := tw.Write(f.SyscallsFile.Data); err != nil {
return err
}
if err := tw.Flush(); err != nil {
return err
}
return nil
}
// Deal with files
func tarGzFile(srcFile string, recPath string, tw *tar.Writer, fi os.FileInfo) error {
//转换字符集
recPath = Utf8ToGBK(recPath)
if fi.IsDir() {
// Create tar header
hdr := new(tar.Header)
// if last character of header name is '/' it also can be directory
// but if you don't set Typeflag, error will occur when you untargz
hdr.Name = recPath + "/"
hdr.Typeflag = tar.TypeDir
hdr.Size = 0
//hdr.Mode = 0755 | c_ISDIR
hdr.Mode = int64(fi.Mode())
hdr.ModTime = fi.ModTime()
// Write hander
err := tw.WriteHeader(hdr)
return err
} else {
// File reader
fr, err := os.Open(srcFile)
if err != nil {
return err
}
defer fr.Close()
// Create tar header
hdr := new(tar.Header)
hdr.Name = recPath
hdr.Size = fi.Size()
hdr.Mode = int64(fi.Mode())
hdr.ModTime = fi.ModTime()
// Write hander
err = tw.WriteHeader(hdr)
if err != nil {
return err
}
// Write file data
_, err = io.Copy(tw, fr)
return err
}
}
func sparseCompress() {
err := os.Mkdir("sparse", 0777)
tarfile, err := os.Create("sparse/sparse.tar")
if err != nil {
log.Fatalln(err)
}
defer tarfile.Close()
var fileWriter io.WriteCloser = tarfile
tfw := tar.NewWriter(fileWriter)
defer tfw.Close()
file, err := os.Open("sparse.img")
defer file.Close()
fileInfo, err := file.Stat()
header := new(tar.Header)
header.Name = file.Name()
header.Size = fileInfo.Size()
header.Mode = int64(fileInfo.Mode())
header.ModTime = fileInfo.ModTime()
header.Typeflag = tar.TypeGNUSparse
err = tfw.WriteHeader(header)
if err != nil {
log.Fatalln(err)
}
_, err = io.Copy(tfw, file)
if err != nil {
log.Fatalln(err)
}
}
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
}
// Write the files into the tar dir
func writeTar(path string, tw *tar.Writer, fi os.FileInfo) error {
fr, err := os.Open(path)
if err != nil {
return err
}
defer fr.Close()
h := new(tar.Header)
h.Name = fi.Name()
h.Size = fi.Size()
h.Mode = int64(fi.Mode())
h.ModTime = fi.ModTime()
err = tw.WriteHeader(h)
if err != nil {
return err
}
_, err = io.Copy(tw, fr)
if err != nil {
return err
}
return err
}
func addFileToArchive(filePath string, addPath string, tarWriter *tar.Writer, fileInfo os.FileInfo) error {
addPath = filepath.ToSlash(addPath)
if isSymlink(fileInfo) {
link, err := filepath.EvalSymlinks(filePath)
if err != nil {
return err
}
filePath = link
fileInfo, err = os.Lstat(filePath)
if err != nil {
return err
}
}
header := new(tar.Header)
header.Name = addPath
header.Size = fileInfo.Size()
header.Mode = int64(fileInfo.Mode())
header.ModTime = fileInfo.ModTime()
fileReader, err := os.Open(filePath)
if err != nil {
return err
}
defer fileReader.Close()
err = tarWriter.WriteHeader(header)
fail.Handle(err)
_, err = io.Copy(tarWriter, fileReader)
return err
}
// file name filelist is like this: './source/file'
func TarFilelist(filelist []string, case_dir string, object_name string) (tar_url string) {
tar_url = path.Join(case_dir, object_name) + ".tar.gz"
fw, err := os.Create(tar_url)
if err != nil {
fmt.Println("Failed in create tar file ", err)
return tar_url
}
defer fw.Close()
gw := gzip.NewWriter(fw)
defer gw.Close()
tw := tar.NewWriter(gw)
defer tw.Close()
for index := 0; index < len(filelist); index++ {
source_file := filelist[index]
fi, err := os.Stat(path.Join(case_dir, source_file))
if err != nil {
fmt.Println(err)
continue
}
fr, err := os.Open(path.Join(case_dir, source_file))
if err != nil {
fmt.Println(err)
continue
}
h := new(tar.Header)
h.Name = source_file
h.Size = fi.Size()
h.Mode = int64(fi.Mode())
h.ModTime = fi.ModTime()
err = tw.WriteHeader(h)
_, err = io.Copy(tw, fr)
}
return tar_url
}
func addFile(path string, fileInfo os.FileInfo, tarFileWriter *tar.Writer) error {
if fileInfo.IsDir() {
return nil
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
header := new(tar.Header)
header.Name = file.Name()
header.Size = fileInfo.Size()
header.Mode = int64(fileInfo.Mode())
header.ModTime = fileInfo.ModTime()
err = tarFileWriter.WriteHeader(header)
if err != nil {
return err
}
_, err = io.Copy(tarFileWriter, file)
if err != nil {
return err
}
return nil
}
// Write a single file to TarGz
func TarGzWrite(item ArchiveItem, tw *tar.Writer, fi os.FileInfo) (err error) {
if item.FileSystemPath != "" {
fr, err := os.Open(item.FileSystemPath)
if err == nil {
defer fr.Close()
h := new(tar.Header)
h.Name = item.ArchivePath
h.Size = fi.Size()
h.Mode = int64(fi.Mode())
h.ModTime = fi.ModTime()
err = tw.WriteHeader(h)
if err == nil {
_, err = io.Copy(tw, fr)
}
}
} else {
h := new(tar.Header)
//backslash-only paths
h.Name = strings.Replace(item.ArchivePath, "\\", "/", -1)
h.Size = int64(len(item.Data))
h.Mode = int64(0644) //? is this ok?
h.ModTime = time.Now()
err = tw.WriteHeader(h)
if err == nil {
_, err = tw.Write(item.Data)
}
}
return err
}
func entar(w io.Writer, dir string, ww io.Writer) error {
msg.Write(ww, msg.User, []byte("entar\n"))
tw := tar.NewWriter(w)
err := filepath.Walk(dir, func(path string, fi os.FileInfo, err error) error {
if err != nil {
return err
}
hdr := new(tar.Header)
hdr.Name = "./app" + path[len(dir):]
hdr.Mode = int64(fi.Mode() & os.ModePerm)
if fi.IsDir() {
hdr.Typeflag = tar.TypeDir
} else {
hdr.Typeflag = tar.TypeReg
hdr.Size = fi.Size()
}
if err = tw.WriteHeader(hdr); err != nil {
return err
}
if !fi.IsDir() {
var f *os.File
f, err = os.Open(path)
if err != nil {
return err
}
_, err = io.Copy(tw, f)
}
return err
})
if err != nil {
return err
}
return tw.Close()
}
func (t *Tarball) addFile(file *File) error {
// grab a handle on the file to read it into the buffer
fr, err := os.Open(file.path)
if err != nil {
return err
}
defer fr.Close()
if stat, err := fr.Stat(); err == nil {
// create the tarball header for this file
header := new(tar.Header)
header.Name = file.path
header.Size = stat.Size()
header.Mode = int64(stat.Mode())
header.ModTime = stat.ModTime()
// write the header to the current tarball
if err := t.tw.WriteHeader(header); err != nil {
return err
}
// copy the file data over now that the header is set
if _, err := io.Copy(t.tw, fr); err == nil {
t.size += stat.Size()
} else {
return err
}
} else {
return err
}
return nil
}
// 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 (c AdminData) Download(createdTime string) revel.Result {
backup, ok := configService.GetBackup(createdTime)
if !ok {
return c.RenderText("")
}
dbname, _ := revel.Config.String("db.dbname")
path := backup["path"] + "/" + dbname
allFiles := ListDir(path)
filename := "backup_" + dbname + "_" + backup["createdTime"] + ".tar.gz"
// file write
fw, err := os.Create(revel.BasePath + "/files/" + filename)
if err != nil {
return c.RenderText("")
}
// defer fw.Close() // 不需要关闭, 还要读取给用户下载
// gzip write
gw := gzip.NewWriter(fw)
defer gw.Close()
// tar write
tw := tar.NewWriter(gw)
defer tw.Close()
// 遍历文件列表
for _, file := range allFiles {
fn := path + "/" + file
fr, err := os.Open(fn)
fileInfo, _ := fr.Stat()
if err != nil {
return c.RenderText("")
}
defer fr.Close()
// 信息头
h := new(tar.Header)
h.Name = file
h.Size = fileInfo.Size()
h.Mode = int64(fileInfo.Mode())
h.ModTime = fileInfo.ModTime()
// 写信息头
err = tw.WriteHeader(h)
if err != nil {
panic(err)
}
// 写文件
_, err = io.Copy(tw, fr)
if err != nil {
panic(err)
}
} // for
return c.RenderBinary(fw, filename, revel.Attachment, time.Now()) // revel.Attachm
}
func MakeTarball(tarname string, fnames []string) error {
log.Printf("tarring %d entrires to %s ...", len(fnames), tarname)
tarfile, err := os.Create(tarname)
if err != nil {
return err
}
defer tarfile.Close()
var tarwriter *tar.Writer
if strings.HasSuffix(tarname, ".gz") {
zipper := gzip.NewWriter(tarfile)
defer zipper.Close()
tarwriter = tar.NewWriter(zipper)
/*
} else if strings.HasSuffix(tarname, ".xz") {
p := xz.WriterDefaults
p.DictCap = 1 << 24
zipper, err := xz.NewWriterParams(tarfile, &p) //xz.NewWriter(tarfile)
if err != nil {
return err
}
defer zipper.Close()
tarwriter = tar.NewWriter(zipper)
*/
} else {
tarwriter = tar.NewWriter(tarfile)
}
defer tarwriter.Close()
for _, fname := range fnames {
realm, ts, good := util.Parse_FName(fname)
if !good {
log.Printf("warning: skip ill-named file '%s'", fname)
continue // skip
}
data, err := util.Load(fname)
if err != nil {
return err
}
hdr := new(tar.Header)
hdr.Name = util.Make_FName(realm, ts, false)
hdr.Size = int64(len(data))
hdr.ModTime = ts
hdr.Mode = 0644
err = tarwriter.WriteHeader(hdr)
if err != nil {
return err
}
log.Printf("tar %d bytes for file %s", hdr.Size, hdr.Name)
_, err = tarwriter.Write(data)
if err != nil {
return err
}
}
log.Printf("%s tarred without errors", tarname)
return nil
}
// Deal with files
func tarGzFile(srcFile string, recPath string, tw *tar.Writer, fi os.FileInfo) {
if fi.IsDir() {
// Create tar header
hdr := new(tar.Header)
hdr.Name = recPath + "/"
hdr.Typeflag = tar.TypeDir
hdr.Size = 0
//hdr.Mode = 0755 | c_ISDIR
hdr.Mode = int64(fi.Mode())
hdr.ModTime = fi.ModTime()
// Write hander
err := tw.WriteHeader(hdr)
if err != nil {
panic(err)
}
} else {
// File reader
fr, err := os.Open(srcFile)
if err != nil {
panic(err)
}
defer fr.Close()
// Create tar header
hdr := new(tar.Header)
hdr.Name = recPath
hdr.Size = fi.Size()
hdr.Mode = int64(fi.Mode())
hdr.ModTime = fi.ModTime()
// Write hander
err = tw.WriteHeader(hdr)
if err != nil {
panic(err)
}
// Write file data
_, err = io.Copy(tw, fr)
if err != nil {
panic(err)
}
}
}
func TarCompress(source, target string) error {
fw, err := os.Create(target)
if err != nil {
return err
}
defer fw.Close()
// gzip write
gw := gzip.NewWriter(fw)
defer gw.Close()
// tar write
tw := tar.NewWriter(gw)
defer tw.Close()
dir, err := os.Open(source)
if err != nil {
return err
}
defer dir.Close()
fis, err := dir.Readdir(0)
if err != nil {
return err
}
for _, fi := range fis {
if fi.IsDir() {
continue
}
fmt.Println(fi.Name())
fr, err := os.Open(dir.Name() + "/" + fi.Name())
if err != nil {
return err
}
defer fr.Close()
h := new(tar.Header)
h.Name = fi.Name()
h.Size = fi.Size()
h.Mode = int64(fi.Mode())
h.ModTime = fi.ModTime()
err = tw.WriteHeader(h)
if err != nil {
return err
}
_, err = io.Copy(tw, fr)
if err != nil {
return err
}
}
return nil
}
func (t *Tar) ChanTar() {
defer sendBoolChan(t.CloseDone, true)
fw, err := os.Create(t.Dest)
if err != nil {
return
}
defer fw.Close()
// if t.Gz {
t.Gw = gzip.NewWriter(fw)
defer t.Gw.Close()
t.Tw = tar.NewWriter(t.Gw)
// }
defer t.Tw.Close()
dir, err := os.Open(t.OriPath)
if err != nil {
return
}
defer dir.Close()
t.Prepare.Done()
for {
var done bool = false
select {
case content := <-t.Ch:
header := new(tar.Header)
header.Name = content.FileName
header.Size = int64(len(content.Text))
header.Mode = content.Mode
if year, _, _ := content.ModTime.Date(); year == 1 {
header.ModTime = time.Now()
}
if err := t.Tw.WriteHeader(header); err != nil {
// todo error
fmt.Println(err.Error())
return
// break
}
if _, err := t.Tw.Write(content.Text); err != nil {
fmt.Println(err.Error())
return
// break
}
t.Job.Done()
case <-t.JobDone:
done = true
break
}
if done {
break
}
}
return
}
func TestUntarCreatesDeeperPathsIfNotMentioned(t *testing.T) {
StartTest(t)
defer FinishTest(t)
// create a buffer and tar.Writer
buffer := bytes.NewBufferString("")
archive := tar.NewWriter(buffer)
writeFile := func(name, contents string) {
b := []byte(contents)
header := new(tar.Header)
header.Name = name
header.Typeflag = tar.TypeReg
header.Mode = 0644
header.Mode |= c_ISREG
header.ModTime = time.Now()
header.Size = int64(len(b))
TestExpectSuccess(t, archive.WriteHeader(header))
_, err := archive.Write(b)
TestExpectSuccess(t, err)
TestExpectSuccess(t, archive.Flush())
}
// generate the mock tar... this will write to a file in a directory that
// isn't already created within the tar
writeFile("./a_directory/file", "foo")
archive.Close()
// create temp folder to extract to
tempDir := TempDir(t)
extractionPath := path.Join(tempDir, "pkg")
err := os.MkdirAll(extractionPath, 0755)
TestExpectSuccess(t, err)
// extract
r := bytes.NewReader(buffer.Bytes())
u := NewUntar(r, extractionPath)
u.AbsoluteRoot = tempDir
TestExpectSuccess(t, u.Extract())
fileExists := func(name string) {
_, err := os.Stat(path.Join(tempDir, name))
TestExpectSuccess(t, err)
}
fileContents := func(name, contents string) {
b, err := ioutil.ReadFile(path.Join(tempDir, name))
TestExpectSuccess(t, err)
TestEqual(t, string(b), contents)
}
fileExists("./pkg/a_directory/file")
fileContents("./pkg/a_directory/file", "foo")
}
func addAllFile(dirPath string, tw *tar.Writer) {
//打开文件夹
dir, err := os.Open(dirPath)
if err != nil {
panic(err)
}
defer dir.Close()
//读取文件列表
fis, err := dir.Readdir(0) //n<=0 读取所有 n>0 读取n个
if err != nil {
panic(err)
}
//遍历文件列表
for _, fi := range fis {
if fi.IsDir() {
addAllFile(dirPath+fi.Name()+"/", tw)
continue
}
//打印文件名称
fmt.Println(dirPath + fi.Name())
//打开文件
fr, err := os.Open(dir.Name() + "/" + fi.Name())
if err != nil {
panic(err)
}
defer fr.Close()
//信息头
h := new(tar.Header)
h.Name = dirPath + fi.Name()
h.Size = fi.Size()
h.Mode = int64(fi.Mode())
h.ModTime = fi.ModTime()
//写信息头
err = tw.WriteHeader(h)
if err != nil {
panic(err)
}
//写文件
_, err = io.Copy(tw, fr)
if err != nil {
panic(err)
}
}
}
// Pack tar and gzip files
func Pack(gzPath, dirPath string, pathMap map[string]int) error {
fw, err := os.Create(gzPath)
if err != nil {
return err
}
defer fw.Close()
gw := gzip.NewWriter(fw)
defer gw.Close()
tw := tar.NewWriter(gw)
defer tw.Close()
for path, val := range pathMap {
if val < 0 {
continue
}
f, err := os.Stat(filepath.Join(dirPath, path))
if err != nil {
continue
}
if f.IsDir() {
continue
}
fr, err := os.Open(filepath.Join(dirPath, path))
if err != nil {
return err
}
defer fr.Close()
h := new(tar.Header)
h.Name = path
h.Size = f.Size()
h.Mode = int64(f.Mode())
h.ModTime = f.ModTime()
err = tw.WriteHeader(h)
if err != nil {
return err
}
_, err = io.Copy(tw, fr)
if err != nil {
return err
}
}
return nil
}
// Deal with files
func tarGzFile(srcFile string, recPath string, tw *tar.Writer, fi os.FileInfo) {
if fi.IsDir() {
// fmt.Println("??")
// Create tar header
hdr := new(tar.Header)
// if last character of header name is '/' it also can be directory
// but if you don't set Typeflag, error will occur when you untargz
hdr.Name = recPath // + "/"
// fmt.Println(hdr.Name)
hdr.Typeflag = tar.TypeDir
// hdr.Size = 0
//hdr.Mode = 0755 | c_ISDIR
// hdr.Mode = int64(fi.Mode()) // 加这个会有错误!!!
// hdr.ModTime = fi.ModTime() // 加这个会有错误!!
// Write hander
err := tw.WriteHeader(hdr)
if err != nil {
panic(err)
}
} else {
// File reader
fr, err := os.Open(srcFile)
if err != nil {
panic(err)
}
defer fr.Close()
// Create tar header
hdr := new(tar.Header)
hdr.Name = recPath
// fmt.Println(hdr.Name)
hdr.Size = fi.Size()
hdr.Mode = int64(fi.Mode())
hdr.ModTime = fi.ModTime()
// Write hander
err = tw.WriteHeader(hdr)
if err != nil {
panic(err)
}
// Write file data
_, err = io.Copy(tw, fr)
if err != nil {
panic(err)
}
}
}
func writeTarEntry(tw *tar.Writer, name string, data []byte) error {
h := new(tar.Header)
h.Name = name
h.Uid = 1000
h.Gid = 1000
h.Mode = 0755
h.Size = int64(len(data))
if err := tw.WriteHeader(h); err != nil {
return err
}
if _, err := tw.Write(data); err != nil {
return err
}
return nil
}
// FIXME: this is duplicated from graph_test.go in the docker package.
func fakeTar() (io.Reader, error) {
content := []byte("Hello world!\n")
buf := new(bytes.Buffer)
tw := tar.NewWriter(buf)
for _, name := range []string{"/etc/postgres/postgres.conf", "/etc/passwd", "/var/log/postgres/postgres.conf"} {
hdr := new(tar.Header)
hdr.Size = int64(len(content))
hdr.Name = name
if err := tw.WriteHeader(hdr); err != nil {
return nil, err
}
tw.Write([]byte(content))
}
tw.Close()
return buf, nil
}
func writeManifest(tw *tar.Writer, manifest map[string]interface{}) error {
buf, err := json.Marshal(manifest)
if err != nil {
return fmt.Errorf("cannot serialize manifest: %v", err)
}
header := tar.Header{}
header.Name = "manifest"
header.Mode = 0644
header.Size = int64(len(buf))
header.Typeflag = tar.TypeReg
tw.WriteHeader(&header)
if _, err := tw.Write(buf); err != nil {
return fmt.Errorf("cannot write manifest: %v", err)
}
return nil
}
// file name filelist is like this: './source/file'
func TarFileList(filelist []string, caseDir string, objectName string) (tarURL string, found bool) {
logrus.Debugf("Tar file %v in %v", filelist, caseDir)
tarURL = path.Join(caseDir, objectName) + ".tar.gz"
fw, err := os.Create(tarURL)
if err != nil {
logrus.Warn(err)
return tarURL, false
}
defer fw.Close()
gw := gzip.NewWriter(fw)
defer gw.Close()
tw := tar.NewWriter(gw)
defer tw.Close()
found = false
for index := 0; index < len(filelist); index++ {
sourceFile := filelist[index]
logrus.Debugf("Tar file %v", sourceFile)
if len(sourceFile) == 0 {
logrus.Debugf("empty sourceFile found")
continue
}
fi, err := os.Stat(path.Join(caseDir, sourceFile))
if err != nil {
logrus.Warn(err)
continue
}
fr, err := os.Open(path.Join(caseDir, sourceFile))
if err != nil {
logrus.Warn(err)
continue
}
h := new(tar.Header)
h.Name = sourceFile
h.Size = fi.Size()
h.Mode = int64(fi.Mode())
h.ModTime = fi.ModTime()
err = tw.WriteHeader(h)
_, err = io.Copy(tw, fr)
found = true
}
if !found {
os.Remove(tarURL)
}
return tarURL, found
}
func tarFile(path string, tw *tar.Writer, fi os.FileInfo) {
fr, err := os.Open(path)
handleErr(err)
defer fr.Close()
hdr := new(tar.Header)
hdr.Name = path
hdr.Size = fi.Size()
hdr.Mode = int64(fi.Mode())
hdr.ModTime = fi.ModTime()
err = tw.WriteHeader(hdr)
handleErr(err)
_, err = io.Copy(tw, fr)
handleErr(err)
return
}
// WriteToTarStream writes a byte array of data into a tar stream
func WriteToTarStream(stream *tar.Writer, data []byte, header tar.Header) error {
if header.Mode == 0 {
header.Mode = 0644
}
if header.Size == 0 {
header.Size = int64(len(data))
}
if header.Typeflag == 0 {
header.Typeflag = tar.TypeReg
}
if err := stream.WriteHeader(&header); err != nil {
return err
}
if _, err := stream.Write(data); err != nil {
return err
}
return nil
}
func TarGzWrite(_path string, tw *tar.Writer, fi os.FileInfo) {
fr, err := os.Open(_path)
handleError(err)
defer fr.Close()
h := new(tar.Header)
h.Name = _path[len(ChallengesPath+"/"):]
h.Size = fi.Size()
h.Mode = int64(fi.Mode())
h.ModTime = fi.ModTime()
h.Typeflag = tar.TypeReg
err = tw.WriteHeader(h)
handleError(err)
_, err = io.Copy(tw, fr)
handleError(err)
}
// differOnlyByFileSize returns true iff the headers differ only by size, but
// that differences is less than within bytes.
func differOnlyByFileSize(a, b *tar.Header, within int64) bool {
if a == nil || b == nil {
return false
}
if a.Size == b.Size {
return false
}
diff := a.Size - b.Size
if diff < 0 {
diff = diff * -1
}
if diff < within && a.Size != 0 && b.Size != 0 {
a.Size = b.Size
if reflect.DeepEqual(a, b) {
return true
}
}
return false
}
func writeHosts(tw *tar.Writer) error {
etcheader := tar.Header{}
etcheader.Name = "rootfs/etc/"
etcheader.Mode = 0644
etcheader.Typeflag = tar.TypeDir
tw.WriteHeader(&etcheader)
content := []byte("127.0.0.1 localhost\n::1 localhost\n")
header := tar.Header{}
header.Name = "rootfs/etc/hosts"
header.Mode = 0644
header.Typeflag = tar.TypeReg
header.Size = int64(len(content))
tw.WriteHeader(&header)
if _, err := tw.Write(content); err != nil {
return fmt.Errorf("cannot write manifest: %v", err)
}
return nil
}