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