package chrootarchive import ( "fmt" "io" "io/ioutil" "os" "path/filepath" "github.com/docker/docker/pkg/archive" "github.com/docker/docker/pkg/system" ) var chrootArchiver = &archive.Archiver{Untar: Untar} // Untar reads a stream of bytes from `archive`, parses it as a tar archive, // and unpacks it into the directory at `dest`. // The archive may be compressed with one of the following algorithms: // identity (uncompressed), gzip, bzip2, xz. func Untar(tarArchive io.Reader, dest string, options *archive.TarOptions) error { return untarHandler(tarArchive, dest, options, true) } // UntarUncompressed reads a stream of bytes from `archive`, parses it as a tar archive, // and unpacks it into the directory at `dest`. // The archive must be an uncompressed stream. func UntarUncompressed(tarArchive io.Reader, dest string, options *archive.TarOptions) error { return untarHandler(tarArchive, dest, options, false) } // Handler for teasing out the automatic decompression func untarHandler(tarArchive io.Reader, dest string, options *archive.TarOptions, decompress bool) error { if tarArchive == nil { return fmt.Errorf("Empty archive") } if options == nil { options = &archive.TarOptions{} } if options.ExcludePatterns == nil { options.ExcludePatterns = []string{} } dest = filepath.Clean(dest) if _, err := os.Stat(dest); os.IsNotExist(err) { if err := system.MkdirAll(dest, 0777); err != nil { return err } } r := ioutil.NopCloser(tarArchive) if decompress { decompressedArchive, err := archive.DecompressStream(tarArchive) if err != nil { return err } defer decompressedArchive.Close() r = decompressedArchive } return invokeUnpack(r, dest, options) } // TarUntar is a convenience function which calls Tar and Untar, with the output of one piped into the other. // If either Tar or Untar fails, TarUntar aborts and returns the error. func TarUntar(src, dst string) error { return chrootArchiver.TarUntar(src, dst) } // CopyWithTar creates a tar archive of filesystem path `src`, and // unpacks it at filesystem path `dst`. // The archive is streamed directly with fixed buffering and no // intermediary disk IO. func CopyWithTar(src, dst string) error { return chrootArchiver.CopyWithTar(src, dst) } // CopyFileWithTar emulates the behavior of the 'cp' command-line // for a single file. It copies a regular file from path `src` to // path `dst`, and preserves all its metadata. // // If `dst` ends with a trailing slash '/' ('\' on Windows), the final // destination path will be `dst/base(src)` or `dst\base(src)` func CopyFileWithTar(src, dst string) (err error) { return chrootArchiver.CopyFileWithTar(src, dst) } // UntarPath is a convenience function which looks for an archive // at filesystem path `src`, and unpacks it at `dst`. func UntarPath(src, dst string) error { return chrootArchiver.UntarPath(src, dst) }