英文:
tar typeflag directory or file when tar'ing directories in golang
问题
我不确定如何在对包含文件和子目录的目录进行tar操作时设置Header.Typeflag。我知道如果我添加
header.Typeflag = '0'
它只会打包文件而不包括目录。当文件或目录时，我该如何设置Typeflag，以便在解压时可以将其传递给tar.TypeDir中的case语句？
以下是从https://www.socketloop.com/tutorials/golang-archive-directory-with-tar-and-gzip中提取的示例代码：
package main
import (
"archive/tar"
"compress/gzip"
"flag"
"fmt"
"io"
"os"
"strings"
"path/filepath"
)
func checkerror(err error) {
if err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func main() {
flag.Parse() // 从命令行获取参数
destinationfile := flag.Arg(0)
if destinationfile == "" {
fmt.Println("Usage : gotar destinationfile.tar.gz source")
os.Exit(1)
}
sourcedir := flag.Arg(1)
if sourcedir == "" {
fmt.Println("Usage : gotar destinationfile.tar.gz source-directory")
os.Exit(1)
}
dir, err := os.Open(sourcedir)
checkerror(err)
defer dir.Close()
files, err := dir.Readdir(0) // 获取文件列表
checkerror(err)
tarfile, err := os.Create(destinationfile)
checkerror(err)
defer tarfile.Close()
var fileWriter io.WriteCloser = tarfile
if strings.HasSuffix(destinationfile, ".gz") {
fileWriter = gzip.NewWriter(tarfile) // 添加gzip过滤器
defer fileWriter.Close() // 如果用户在目标文件名中添加了.gz
}
tarfileWriter := tar.NewWriter(fileWriter)
defer tarfileWriter.Close()
for _, fileInfo := range files {
if fileInfo.IsDir() {
continue
}
// 参考：https://www.socketloop.com/tutorials/go-file-path-independent-of-operating-system
file, err := os.Open(dir.Name() + string(filepath.Separator) + fileInfo.Name())
checkerror(err)
defer file.Close()
// 准备tar头部
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)
checkerror(err)
_, err = io.Copy(tarfileWriter, file)
checkerror(err)
}
}
英文:
I'm not sure how to set Header.Typeflag when tar'ing a directory with files and subdirectories. I know if I add
header.Typeflag = '0'
It will only tar files but not directories. How do I set the Typeflag when it is a file or directory so when untar'ing I can pass it in a case statement to tar.TypeDir
Example taken from https://www.socketloop.com/tutorials/golang-archive-directory-with-tar-and-gzip
package main
import (
"archive/tar"
"compress/gzip"
"flag"
"fmt"
"io"
"os"
"strings"
"path/filepath"
)
func checkerror(err error) {
if err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func main() {
flag.Parse() // get the arguments from command line
destinationfile := flag.Arg(0)
if destinationfile == "" {
fmt.Println("Usage : gotar destinationfile.tar.gz source")
os.Exit(1)
}
sourcedir := flag.Arg(1)
if sourcedir == "" {
fmt.Println("Usage : gotar destinationfile.tar.gz source-directory")
os.Exit(1)
}
dir, err := os.Open(sourcedir)
checkerror(err)
defer dir.Close()
files, err := dir.Readdir(0) // grab the files list
checkerror(err)
tarfile, err := os.Create(destinationfile)
checkerror(err)
defer tarfile.Close()
var fileWriter io.WriteCloser = tarfile
if strings.HasSuffix(destinationfile, ".gz") {
fileWriter = gzip.NewWriter(tarfile) // add a gzip filter
defer fileWriter.Close() // if user add .gz in the destination filename
}
tarfileWriter := tar.NewWriter(fileWriter)
defer tarfileWriter.Close()
for _, fileInfo := range files {
if fileInfo.IsDir() {
continue
}
// see https://www.socketloop.com/tutorials/go-file-path-independent-of-operating-system
file, err := os.Open(dir.Name() + string(filepath.Separator) + fileInfo.Name())
checkerror(err)
defer file.Close()
// prepare the tar header
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)
checkerror(err)
_, err = io.Copy(tarfileWriter, file)
checkerror(err)
}
}
答案1
得分: 1
如果文件在磁盘上，看起来是这样的，那么这部分工作已经为您完成了。请查看FileInfoHeader。根据资源（在您的情况下是目录或文件）可以推断出的信息，它将设置Typeflag。
有关可用选项的完整列表，请参阅tar标准文档。
英文:
If the files are on disk, which it looks like they are, then that part is done for you. Have a look at FileInfoHeader. That will set the Typeflag based on what it can extrapolate from the resource (directory or file in your case.)
For a complete list of the available options see the tar standard docs
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