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package archiver
import (
"fmt"
"io"
"strings"
"github.com/ulikunitz/xz"
fastxz "github.com/xi2/xz"
)
// TarXz facilitates xz compression
// (https://tukaani.org/xz/format.html)
// of tarball archives.
type TarXz struct {
*Tar
}
// CheckExt ensures the file extension matches the format.
func (*TarXz) CheckExt(filename string) error {
if !strings.HasSuffix(filename, ".tar.xz") &&
!strings.HasSuffix(filename, ".txz") {
return fmt.Errorf("filename must have a .tar.xz or .txz extension")
}
return nil
}
// Archive creates a compressed tar file at destination
// containing the files listed in sources. The destination
// must end with ".tar.xz" or ".txz". File paths can be
// those of regular files or directories; directories will
// be recursively added.
func (txz *TarXz) Archive(sources []string, destination string) error {
err := txz.CheckExt(destination)
if err != nil {
return fmt.Errorf("output %s", err.Error())
}
txz.wrapWriter()
return txz.Tar.Archive(sources, destination)
}
// Unarchive unpacks the compressed tarball at
// source to destination. Destination will be
// treated as a folder name.
func (txz *TarXz) Unarchive(source, destination string) error {
txz.wrapReader()
return txz.Tar.Unarchive(source, destination)
}
// Walk calls walkFn for each visited item in archive.
func (txz *TarXz) Walk(archive string, walkFn WalkFunc) error {
txz.wrapReader()
return txz.Tar.Walk(archive, walkFn)
}
// Create opens txz for writing a compressed
// tar archive to out.
func (txz *TarXz) Create(out io.Writer) error {
txz.wrapWriter()
return txz.Tar.Create(out)
}
// Open opens t for reading a compressed archive from
// in. The size parameter is not used.
func (txz *TarXz) Open(in io.Reader, size int64) error {
txz.wrapReader()
return txz.Tar.Open(in, size)
}
// Extract extracts a single file from the tar archive.
// If the target is a directory, the entire folder will
// be extracted into destination.
func (txz *TarXz) Extract(source, target, destination string) error {
txz.wrapReader()
return txz.Tar.Extract(source, target, destination)
}
func (txz *TarXz) wrapWriter() {
var xzw *xz.Writer
txz.Tar.writerWrapFn = func(w io.Writer) (io.Writer, error) {
var err error
xzw, err = xz.NewWriter(w)
return xzw, err
}
txz.Tar.cleanupWrapFn = func() {
xzw.Close()
}
}
func (txz *TarXz) wrapReader() {
var xzr *fastxz.Reader
txz.Tar.readerWrapFn = func(r io.Reader) (io.Reader, error) {
var err error
xzr, err = fastxz.NewReader(r, 0)
return xzr, err
}
}
func (txz *TarXz) String() string { return "tar.xz" }
// NewTarXz returns a new, default instance ready to be customized and used.
func NewTarXz() *TarXz {
return &TarXz{
Tar: NewTar(),
}
}
// Compile-time checks to ensure type implements desired interfaces.
var (
_ = Reader(new(TarXz))
_ = Writer(new(TarXz))
_ = Archiver(new(TarXz))
_ = Unarchiver(new(TarXz))
_ = Walker(new(TarXz))
_ = Extractor(new(TarXz))
)
// DefaultTarXz is a convenient archiver ready to use.
var DefaultTarXz = NewTarXz()
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