import "archive/tar"

Overview

Index

Constants

Variables

type Header

type Reader

    func NewReader(r io.Reader) *Reader

    func (tr *Reader) Next() (*Header, error)

    func (tr *Reader) Read(b []byte) (n int, err error)

type Writer

    func NewWriter(w io.Writer) *Writer

    func (tw *Writer) Close() error

    func (tw *Writer) Flush() error

    func (tw *Writer) Write(b []byte) (n int, err error)

    func (tw *Writer) WriteHeader(hdr *Header) error

Package files

common.go reader.go writer.go

Constants

const (

    // Types
    TypeReg           = '0'    // regular file
    TypeRegA          = '\x00' // regular file
    TypeLink          = '1'    // hard link
    TypeSymlink       = '2'    // symbolic link
    TypeChar          = '3'    // character device node
    TypeBlock         = '4'    // block device node
    TypeDir           = '5'    // directory
    TypeFifo          = '6'    // fifo node
    TypeCont          = '7'    // reserved
    TypeXHeader       = 'x'    // extended header
    TypeXGlobalHeader = 'g'    // global extended header
)

Variables

var (
    ErrWriteTooLong    = errors.New("archive/tar: write too long")
    ErrFieldTooLong    = errors.New("archive/tar: header field too long")
    ErrWriteAfterClose = errors.New("archive/tar: write after close")
)

var (
    ErrHeader = errors.New("archive/tar: invalid tar header")
)

type Header

type Header struct {
    Name       string    // name of header file entry
    Mode       int64     // permission and mode bits
    Uid        int       // user id of owner
    Gid        int       // group id of owner
    Size       int64     // length in bytes
    ModTime    time.Time // modified time
    Typeflag   byte      // type of header entry
    Linkname   string    // target name of link
    Uname      string    // user name of owner
    Gname      string    // group name of owner
    Devmajor   int64     // major number of character or block device
    Devminor   int64     // minor number of character or block device
    AccessTime time.Time // access time
    ChangeTime time.Time // status change time
}

A Header represents a single header in a tar archive. Some fields may not be populated.

type Reader

type Reader struct {
    // contains filtered or unexported fields
}

A Reader provides sequential access to the contents of a tar archive. A tar archive consists of a sequence of files. The Next method advances to the next file in the archive (including the first), and then it can be treated as an io.Reader to access the file's data.

Example:

tr := tar.NewReader(r)
for {
	hdr, err := tr.Next()
	if err == io.EOF {
		// end of tar archive
		break
	}
	if err != nil {
		// handle error
	}
	io.Copy(data, tr)
}

func NewReader

func NewReader(r io.Reader) *Reader

NewReader creates a new Reader reading from r.

func (*Reader) Next

func (tr *Reader) Next() (*Header, error)

Next advances to the next entry in the tar archive.

func (*Reader) Read

func (tr *Reader) Read(b []byte) (n int, err error)

Read reads from the current entry in the tar archive. It returns 0, io.EOF when it reaches the end of that entry, until Next is called to advance to the next entry.

type Writer

type Writer struct {
    // contains filtered or unexported fields
}

A Writer provides sequential writing of a tar archive in POSIX.1 format. A tar archive consists of a sequence of files. Call WriteHeader to begin a new file, and then call Write to supply that file's data, writing at most hdr.Size bytes in total.

Example:

tw := tar.NewWriter(w)
hdr := new(Header)
hdr.Size = length of data in bytes
// populate other hdr fields as desired
if err := tw.WriteHeader(hdr); err != nil {
	// handle error
}
io.Copy(tw, data)
tw.Close()

func NewWriter

func NewWriter(w io.Writer) *Writer

NewWriter creates a new Writer writing to w.

func (*Writer) Close

func (tw *Writer) Close() error

Close closes the tar archive, flushing any unwritten data to the underlying writer.

func (*Writer) Flush

func (tw *Writer) Flush() error

Flush finishes writing the current file (optional).

func (*Writer) Write

func (tw *Writer) Write(b []byte) (n int, err error)

Write writes to the current entry in the tar archive. Write returns the error ErrWriteTooLong if more than hdr.Size bytes are written after WriteHeader.

func (*Writer) WriteHeader

func (tw *Writer) WriteHeader(hdr *Header) error

WriteHeader writes hdr and prepares to accept the file's contents. WriteHeader calls Flush if it is not the first header. Calling after a Close will return ErrWriteAfterClose.