mirror of
https://github.com/go-gitea/gitea.git
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617 lines
15 KiB
Go
617 lines
15 KiB
Go
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package archiver
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import (
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"archive/tar"
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"bytes"
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"fmt"
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"io"
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"log"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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)
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// Tar provides facilities for operating TAR archives.
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// See http://www.gnu.org/software/tar/manual/html_node/Standard.html.
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type Tar struct {
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// Whether to overwrite existing files; if false,
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// an error is returned if the file exists.
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OverwriteExisting bool
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// Whether to make all the directories necessary
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// to create a tar archive in the desired path.
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MkdirAll bool
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// A single top-level folder can be implicitly
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// created by the Archive or Unarchive methods
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// if the files to be added to the archive
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// or the files to be extracted from the archive
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// do not all have a common root. This roughly
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// mimics the behavior of archival tools integrated
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// into OS file browsers which create a subfolder
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// to avoid unexpectedly littering the destination
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// folder with potentially many files, causing a
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// problematic cleanup/organization situation.
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// This feature is available for both creation
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// and extraction of archives, but may be slightly
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// inefficient with lots and lots of files,
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// especially on extraction.
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ImplicitTopLevelFolder bool
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// If true, errors encountered during reading
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// or writing a single file will be logged and
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// the operation will continue on remaining files.
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ContinueOnError bool
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tw *tar.Writer
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tr *tar.Reader
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readerWrapFn func(io.Reader) (io.Reader, error)
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writerWrapFn func(io.Writer) (io.Writer, error)
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cleanupWrapFn func()
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}
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// CheckExt ensures the file extension matches the format.
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func (*Tar) CheckExt(filename string) error {
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if !strings.HasSuffix(filename, ".tar") {
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return fmt.Errorf("filename must have a .tar extension")
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}
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return nil
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}
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// Archive creates a tarball file at destination containing
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// the files listed in sources. The destination must end with
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// ".tar". File paths can be those of regular files or
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// directories; directories will be recursively added.
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func (t *Tar) Archive(sources []string, destination string) error {
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err := t.CheckExt(destination)
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if t.writerWrapFn == nil && err != nil {
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return fmt.Errorf("checking extension: %v", err)
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}
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if !t.OverwriteExisting && fileExists(destination) {
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return fmt.Errorf("file already exists: %s", destination)
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}
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// make the folder to contain the resulting archive
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// if it does not already exist
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destDir := filepath.Dir(destination)
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if t.MkdirAll && !fileExists(destDir) {
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err := mkdir(destDir, 0755)
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if err != nil {
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return fmt.Errorf("making folder for destination: %v", err)
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}
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}
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out, err := os.Create(destination)
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if err != nil {
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return fmt.Errorf("creating %s: %v", destination, err)
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}
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defer out.Close()
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err = t.Create(out)
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if err != nil {
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return fmt.Errorf("creating tar: %v", err)
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}
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defer t.Close()
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var topLevelFolder string
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if t.ImplicitTopLevelFolder && multipleTopLevels(sources) {
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topLevelFolder = folderNameFromFileName(destination)
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}
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for _, source := range sources {
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err := t.writeWalk(source, topLevelFolder, destination)
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if err != nil {
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return fmt.Errorf("walking %s: %v", source, err)
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}
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}
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return nil
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}
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// Unarchive unpacks the .tar file at source to destination.
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// Destination will be treated as a folder name.
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func (t *Tar) Unarchive(source, destination string) error {
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if !fileExists(destination) && t.MkdirAll {
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err := mkdir(destination, 0755)
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if err != nil {
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return fmt.Errorf("preparing destination: %v", err)
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}
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}
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// if the files in the archive do not all share a common
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// root, then make sure we extract to a single subfolder
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// rather than potentially littering the destination...
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if t.ImplicitTopLevelFolder {
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var err error
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destination, err = t.addTopLevelFolder(source, destination)
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if err != nil {
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return fmt.Errorf("scanning source archive: %v", err)
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}
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}
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file, err := os.Open(source)
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if err != nil {
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return fmt.Errorf("opening source archive: %v", err)
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}
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defer file.Close()
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err = t.Open(file, 0)
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if err != nil {
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return fmt.Errorf("opening tar archive for reading: %v", err)
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}
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defer t.Close()
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for {
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err := t.untarNext(destination)
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if err == io.EOF {
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break
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}
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if err != nil {
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if t.ContinueOnError {
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log.Printf("[ERROR] Reading file in tar archive: %v", err)
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continue
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}
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return fmt.Errorf("reading file in tar archive: %v", err)
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}
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}
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return nil
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}
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// addTopLevelFolder scans the files contained inside
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// the tarball named sourceArchive and returns a modified
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// destination if all the files do not share the same
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// top-level folder.
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func (t *Tar) addTopLevelFolder(sourceArchive, destination string) (string, error) {
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file, err := os.Open(sourceArchive)
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if err != nil {
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return "", fmt.Errorf("opening source archive: %v", err)
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}
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defer file.Close()
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// if the reader is to be wrapped, ensure we do that now
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// or we will not be able to read the archive successfully
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reader := io.Reader(file)
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if t.readerWrapFn != nil {
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reader, err = t.readerWrapFn(reader)
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if err != nil {
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return "", fmt.Errorf("wrapping reader: %v", err)
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}
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}
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if t.cleanupWrapFn != nil {
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defer t.cleanupWrapFn()
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}
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tr := tar.NewReader(reader)
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var files []string
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for {
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hdr, err := tr.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return "", fmt.Errorf("scanning tarball's file listing: %v", err)
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}
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files = append(files, hdr.Name)
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}
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if multipleTopLevels(files) {
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destination = filepath.Join(destination, folderNameFromFileName(sourceArchive))
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}
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return destination, nil
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}
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func (t *Tar) untarNext(to string) error {
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f, err := t.Read()
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if err != nil {
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return err // don't wrap error; calling loop must break on io.EOF
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}
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header, ok := f.Header.(*tar.Header)
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if !ok {
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return fmt.Errorf("expected header to be *tar.Header but was %T", f.Header)
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}
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return t.untarFile(f, filepath.Join(to, header.Name))
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}
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func (t *Tar) untarFile(f File, to string) error {
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// do not overwrite existing files, if configured
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if !f.IsDir() && !t.OverwriteExisting && fileExists(to) {
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return fmt.Errorf("file already exists: %s", to)
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}
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hdr, ok := f.Header.(*tar.Header)
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if !ok {
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return fmt.Errorf("expected header to be *tar.Header but was %T", f.Header)
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}
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switch hdr.Typeflag {
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case tar.TypeDir:
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return mkdir(to, f.Mode())
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case tar.TypeReg, tar.TypeRegA, tar.TypeChar, tar.TypeBlock, tar.TypeFifo, tar.TypeGNUSparse:
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return writeNewFile(to, f, f.Mode())
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case tar.TypeSymlink:
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return writeNewSymbolicLink(to, hdr.Linkname)
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case tar.TypeLink:
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return writeNewHardLink(to, filepath.Join(to, hdr.Linkname))
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case tar.TypeXGlobalHeader:
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return nil // ignore the pax global header from git-generated tarballs
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default:
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return fmt.Errorf("%s: unknown type flag: %c", hdr.Name, hdr.Typeflag)
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}
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}
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func (t *Tar) writeWalk(source, topLevelFolder, destination string) error {
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sourceInfo, err := os.Stat(source)
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if err != nil {
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return fmt.Errorf("%s: stat: %v", source, err)
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}
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destAbs, err := filepath.Abs(destination)
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if err != nil {
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return fmt.Errorf("%s: getting absolute path of destination %s: %v", source, destination, err)
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}
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return filepath.Walk(source, func(fpath string, info os.FileInfo, err error) error {
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handleErr := func(err error) error {
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if t.ContinueOnError {
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log.Printf("[ERROR] Walking %s: %v", fpath, err)
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return nil
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}
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return err
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}
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if err != nil {
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return handleErr(fmt.Errorf("traversing %s: %v", fpath, err))
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}
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if info == nil {
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return handleErr(fmt.Errorf("no file info"))
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}
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// make sure we do not copy our output file into itself
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fpathAbs, err := filepath.Abs(fpath)
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if err != nil {
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return handleErr(fmt.Errorf("%s: getting absolute path: %v", fpath, err))
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}
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if within(fpathAbs, destAbs) {
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return nil
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}
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// build the name to be used within the archive
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nameInArchive, err := makeNameInArchive(sourceInfo, source, topLevelFolder, fpath)
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if err != nil {
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return handleErr(err)
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}
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var file io.ReadCloser
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if info.Mode().IsRegular() {
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file, err = os.Open(fpath)
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if err != nil {
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return handleErr(fmt.Errorf("%s: opening: %v", fpath, err))
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}
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defer file.Close()
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}
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err = t.Write(File{
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FileInfo: FileInfo{
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FileInfo: info,
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CustomName: nameInArchive,
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},
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ReadCloser: file,
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})
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if err != nil {
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return handleErr(fmt.Errorf("%s: writing: %s", fpath, err))
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}
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return nil
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})
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}
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// Create opens t for writing a tar archive to out.
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func (t *Tar) Create(out io.Writer) error {
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if t.tw != nil {
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return fmt.Errorf("tar archive is already created for writing")
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}
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// wrapping writers allows us to output
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// compressed tarballs, for example
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if t.writerWrapFn != nil {
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var err error
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out, err = t.writerWrapFn(out)
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if err != nil {
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return fmt.Errorf("wrapping writer: %v", err)
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}
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}
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t.tw = tar.NewWriter(out)
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return nil
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}
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// Write writes f to t, which must have been opened for writing first.
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func (t *Tar) Write(f File) error {
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if t.tw == nil {
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return fmt.Errorf("tar archive was not created for writing first")
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}
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if f.FileInfo == nil {
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return fmt.Errorf("no file info")
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}
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if f.FileInfo.Name() == "" {
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return fmt.Errorf("missing file name")
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}
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var linkTarget string
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if isSymlink(f) {
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var err error
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linkTarget, err = os.Readlink(f.Name())
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if err != nil {
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return fmt.Errorf("%s: readlink: %v", f.Name(), err)
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}
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}
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hdr, err := tar.FileInfoHeader(f, filepath.ToSlash(linkTarget))
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if err != nil {
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return fmt.Errorf("%s: making header: %v", f.Name(), err)
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}
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err = t.tw.WriteHeader(hdr)
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if err != nil {
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return fmt.Errorf("%s: writing header: %v", hdr.Name, err)
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}
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if f.IsDir() {
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return nil // directories have no contents
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}
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if hdr.Typeflag == tar.TypeReg {
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if f.ReadCloser == nil {
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return fmt.Errorf("%s: no way to read file contents", f.Name())
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}
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_, err := io.Copy(t.tw, f)
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if err != nil {
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return fmt.Errorf("%s: copying contents: %v", f.Name(), err)
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}
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}
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return nil
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}
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// Open opens t for reading an archive from
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// in. The size parameter is not used.
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func (t *Tar) Open(in io.Reader, size int64) error {
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if t.tr != nil {
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return fmt.Errorf("tar archive is already open for reading")
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}
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// wrapping readers allows us to open compressed tarballs
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if t.readerWrapFn != nil {
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var err error
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in, err = t.readerWrapFn(in)
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if err != nil {
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return fmt.Errorf("wrapping file reader: %v", err)
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}
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}
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t.tr = tar.NewReader(in)
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return nil
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}
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// Read reads the next file from t, which must have
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// already been opened for reading. If there are no
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// more files, the error is io.EOF. The File must
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// be closed when finished reading from it.
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func (t *Tar) Read() (File, error) {
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if t.tr == nil {
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return File{}, fmt.Errorf("tar archive is not open")
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}
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hdr, err := t.tr.Next()
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if err != nil {
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return File{}, err // don't wrap error; preserve io.EOF
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}
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file := File{
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FileInfo: hdr.FileInfo(),
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Header: hdr,
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ReadCloser: ReadFakeCloser{t.tr},
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}
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return file, nil
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}
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// Close closes the tar archive(s) opened by Create and Open.
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func (t *Tar) Close() error {
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var err error
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if t.tr != nil {
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t.tr = nil
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}
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if t.tw != nil {
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tw := t.tw
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t.tw = nil
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err = tw.Close()
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}
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// make sure cleanup of "Reader/Writer wrapper"
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// (say that ten times fast) happens AFTER the
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// underlying stream is closed
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if t.cleanupWrapFn != nil {
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t.cleanupWrapFn()
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}
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return err
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}
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// Walk calls walkFn for each visited item in archive.
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func (t *Tar) Walk(archive string, walkFn WalkFunc) error {
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file, err := os.Open(archive)
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if err != nil {
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return fmt.Errorf("opening archive file: %v", err)
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}
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defer file.Close()
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err = t.Open(file, 0)
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if err != nil {
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return fmt.Errorf("opening archive: %v", err)
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}
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defer t.Close()
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for {
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f, err := t.Read()
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if err == io.EOF {
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break
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}
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if err != nil {
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if t.ContinueOnError {
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||
|
log.Printf("[ERROR] Opening next file: %v", err)
|
||
|
continue
|
||
|
}
|
||
|
return fmt.Errorf("opening next file: %v", err)
|
||
|
}
|
||
|
err = walkFn(f)
|
||
|
if err != nil {
|
||
|
if err == ErrStopWalk {
|
||
|
break
|
||
|
}
|
||
|
if t.ContinueOnError {
|
||
|
log.Printf("[ERROR] Walking %s: %v", f.Name(), err)
|
||
|
continue
|
||
|
}
|
||
|
return fmt.Errorf("walking %s: %v", f.Name(), err)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
// Extract extracts a single file from the tar archive.
|
||
|
// If the target is a directory, the entire folder will
|
||
|
// be extracted into destination.
|
||
|
func (t *Tar) Extract(source, target, destination string) error {
|
||
|
// target refers to a path inside the archive, which should be clean also
|
||
|
target = path.Clean(target)
|
||
|
|
||
|
// if the target ends up being a directory, then
|
||
|
// we will continue walking and extracting files
|
||
|
// until we are no longer within that directory
|
||
|
var targetDirPath string
|
||
|
|
||
|
return t.Walk(source, func(f File) error {
|
||
|
th, ok := f.Header.(*tar.Header)
|
||
|
if !ok {
|
||
|
return fmt.Errorf("expected header to be *tar.Header but was %T", f.Header)
|
||
|
}
|
||
|
|
||
|
// importantly, cleaning the path strips tailing slash,
|
||
|
// which must be appended to folders within the archive
|
||
|
name := path.Clean(th.Name)
|
||
|
if f.IsDir() && target == name {
|
||
|
targetDirPath = path.Dir(name)
|
||
|
}
|
||
|
|
||
|
if within(target, th.Name) {
|
||
|
// either this is the exact file we want, or is
|
||
|
// in the directory we want to extract
|
||
|
|
||
|
// build the filename we will extract to
|
||
|
end, err := filepath.Rel(targetDirPath, th.Name)
|
||
|
if err != nil {
|
||
|
return fmt.Errorf("relativizing paths: %v", err)
|
||
|
}
|
||
|
joined := filepath.Join(destination, end)
|
||
|
|
||
|
err = t.untarFile(f, joined)
|
||
|
if err != nil {
|
||
|
return fmt.Errorf("extracting file %s: %v", th.Name, err)
|
||
|
}
|
||
|
|
||
|
// if our target was not a directory, stop walk
|
||
|
if targetDirPath == "" {
|
||
|
return ErrStopWalk
|
||
|
}
|
||
|
} else if targetDirPath != "" {
|
||
|
// finished walking the entire directory
|
||
|
return ErrStopWalk
|
||
|
}
|
||
|
|
||
|
return nil
|
||
|
})
|
||
|
}
|
||
|
|
||
|
// Match returns true if the format of file matches this
|
||
|
// type's format. It should not affect reader position.
|
||
|
func (*Tar) Match(file io.ReadSeeker) (bool, error) {
|
||
|
currentPos, err := file.Seek(0, io.SeekCurrent)
|
||
|
if err != nil {
|
||
|
return false, err
|
||
|
}
|
||
|
_, err = file.Seek(0, 0)
|
||
|
if err != nil {
|
||
|
return false, err
|
||
|
}
|
||
|
defer file.Seek(currentPos, io.SeekStart)
|
||
|
|
||
|
buf := make([]byte, tarBlockSize)
|
||
|
if _, err = io.ReadFull(file, buf); err != nil {
|
||
|
return false, nil
|
||
|
}
|
||
|
return hasTarHeader(buf), nil
|
||
|
}
|
||
|
|
||
|
// hasTarHeader checks passed bytes has a valid tar header or not. buf must
|
||
|
// contain at least 512 bytes and if not, it always returns false.
|
||
|
func hasTarHeader(buf []byte) bool {
|
||
|
if len(buf) < tarBlockSize {
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
b := buf[148:156]
|
||
|
b = bytes.Trim(b, " \x00") // clean up all spaces and null bytes
|
||
|
if len(b) == 0 {
|
||
|
return false // unknown format
|
||
|
}
|
||
|
hdrSum, err := strconv.ParseUint(string(b), 8, 64)
|
||
|
if err != nil {
|
||
|
return false
|
||
|
}
|
||
|
|
||
|
// According to the go official archive/tar, Sun tar uses signed byte
|
||
|
// values so this calcs both signed and unsigned
|
||
|
var usum uint64
|
||
|
var sum int64
|
||
|
for i, c := range buf {
|
||
|
if 148 <= i && i < 156 {
|
||
|
c = ' ' // checksum field itself is counted as branks
|
||
|
}
|
||
|
usum += uint64(uint8(c))
|
||
|
sum += int64(int8(c))
|
||
|
}
|
||
|
|
||
|
if hdrSum != usum && int64(hdrSum) != sum {
|
||
|
return false // invalid checksum
|
||
|
}
|
||
|
|
||
|
return true
|
||
|
}
|
||
|
|
||
|
func (t *Tar) String() string { return "tar" }
|
||
|
|
||
|
// NewTar returns a new, default instance ready to be customized and used.
|
||
|
func NewTar() *Tar {
|
||
|
return &Tar{
|
||
|
MkdirAll: true,
|
||
|
}
|
||
|
}
|
||
|
|
||
|
const tarBlockSize = 512
|
||
|
|
||
|
// Compile-time checks to ensure type implements desired interfaces.
|
||
|
var (
|
||
|
_ = Reader(new(Tar))
|
||
|
_ = Writer(new(Tar))
|
||
|
_ = Archiver(new(Tar))
|
||
|
_ = Unarchiver(new(Tar))
|
||
|
_ = Walker(new(Tar))
|
||
|
_ = Extractor(new(Tar))
|
||
|
_ = Matcher(new(Tar))
|
||
|
_ = ExtensionChecker(new(Tar))
|
||
|
)
|
||
|
|
||
|
// DefaultTar is a default instance that is conveniently ready to use.
|
||
|
var DefaultTar = NewTar()
|