#! /bin/sh # Usage: tarcat volume1 volume2 ... # concatenates a GNU tar multi-volume archive into a single tar archive. # Author: Bruno Haible , Sergey Poznyakoff # Copyright 2004-2023 Free Software Foundation, Inc. # This file is part of GNU tar. # GNU tar is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3 of the License, or # (at your option) any later version. # GNU tar is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program. If not, see . # dump_type FILE [N] # Print type character from block N (default 0) of tar archive FILE dump_type() { dd if="$1" skip=${2:-0} bs=512 count=1 2>/dev/null | tr '\0' ' ' | cut -c157 } case `dump_type "$1"` in [gx]) PAX=1;; esac cat "$1" shift for f do SKIP=0 T=`dump_type "$f"` if [ -n "$PAX" ]; then if [ "$T" = "g" ]; then # Global extended header.... 2 blocks # Extended header........... 2 blocks # Ustar header.............. 1 block # FIXME: This calculation is will fail for very long file names. SKIP=5 fi else if [ "$T" = "V" ]; then T=`dump_type "$f" 1` fi if [ "$T" = "M" ]; then SKIP=$(($SKIP + 1)) fi fi dd skip=$SKIP if="$f" done