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write_tar.go
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write_tar.go
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package compressor
import (
"archive/tar"
"io"
"os"
"path/filepath"
)
func WriteTar(srcPath string, dest io.Writer) error {
absPath, err := filepath.Abs(srcPath)
if err != nil {
return err
}
tw := tar.NewWriter(dest)
defer tw.Close()
err = filepath.Walk(absPath, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
var relative string
if os.IsPathSeparator(srcPath[len(srcPath)-1]) {
relative, err = filepath.Rel(absPath, path)
} else {
relative, err = filepath.Rel(filepath.Dir(absPath), path)
}
relative = filepath.ToSlash(relative)
if err != nil {
return err
}
return addTarFile(path, relative, tw)
})
return err
}
func addTarFile(path, name string, tw *tar.Writer) error {
fi, err := os.Lstat(path)
if err != nil {
return err
}
link := ""
if fi.Mode()&os.ModeSymlink != 0 {
if link, err = os.Readlink(path); err != nil {
return err
}
}
hdr, err := tar.FileInfoHeader(fi, link)
if err != nil {
return err
}
if fi.IsDir() && !os.IsPathSeparator(name[len(name)-1]) {
name = name + "/"
}
if hdr.Typeflag == tar.TypeReg && name == "." {
// archiving a single file
hdr.Name = filepath.ToSlash(filepath.Base(path))
} else {
hdr.Name = filepath.ToSlash(name)
}
if err := tw.WriteHeader(hdr); err != nil {
return err
}
if hdr.Typeflag == tar.TypeReg {
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
_, err = io.Copy(tw, file)
if err != nil {
return err
}
}
return nil
}