X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Ftar;a=blobdiff_plain;f=scripts%2Ftarcat;h=8b84241a38afccb8c19187e17dab5aec23d21ff8;hp=9c8fed1cd20dec238578af2784e63712b18cf859;hb=45ccda119355a1087450039a250359c1d0de0d08;hpb=c8b0fd28c2f4a43fe5c7a8fb2432595fbd8d3d88

diff --git a/scripts/tarcat b/scripts/tarcat
index 9c8fed1..8b84241 100755
--- a/scripts/tarcat
+++ b/scripts/tarcat
@@ -1,11 +1,58 @@
 #! /bin/sh
 # Usage: tarcat volume1 volume2 ...
 # concatenates a GNU tar multi-volume archive into a single tar archive.
-# Author: Bruno Haible <bruno@clisp.org>
+# Author: Bruno Haible <bruno@clisp.org>, Sergey Poznyakoff <gray@gnu.org.ua>
+
+# Copyright 2004-2005, 2010, 2013-2014 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 <http://www.gnu.org/licenses/>.
+
+# 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 "$1"
 shift
 for f
 do
-  dd skip=1 if="$f" 
+  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