1#!/bin/sh
2# Copyright 1994,2002 David C. Niemi.
3# Copyright 1996,1997,2001-2003 Alain Knaff.
4# This file is part of mtools.
5#
6# Mtools is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10#
11# Mtools is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with Mtools.  If not, see <http://www.gnu.org/licenses/>.
18# uz [file...]
19# lz [file...]
20#
21# If called "uz", gunzips and extracts a gzip'd tar'd archive.
22# If called "lz", gunzips and shows a listing of a gzip'd tar'd archive.
23#
24# Requires: gzip and tar in the user's path.  Should work with most tars.
25# "-" is now used for backwards compatibility with antique tars, e.g. SCO.
26#
27# 1994/02/19	DCN	Created (as a trivial, but useful script)
28# 1994/12/01	DCN	Combined uz and lz, added suffix handling
29# 2002/09/11	DCN	Added bzip2 support
30#
31# Copyright (C) 1994, 2002 David C. Niemi (niemi at tuxers dot net)
32# The author requires that any copies or derived works include this
33# copyright notice; no other restrictions are placed on its use.
34#
35
36set -e
37set -u
38
39## Default unzipping command
40uzcmd='gzip -cd'
41
42case $0 in
43*uz)
44	tarparam="-pxvf"
45	action="Extracting from "
46	;;
47*lz)
48	tarparam="-tvf"
49	action="Reading directory of "
50	;;
51*)
52	echo "$0: expect to be named either \"uz\" or \"lz\"." >&2
53	exit 1
54	;;
55esac
56
57if [ $# = 0 ]; then
58	echo "$action standard input." >&2
59	$uzcmd - | tar "$tarparam" -
60	exit 0
61fi
62
63while [ $# -ge 1 ]; do
64	echo >&2
65	found=
66
67	for suffix in "" .gz .tgz .tar.gz .z .tar.z .taz .tpz .Z .tar.Z .tar.bz2; do
68		if [ -r "${1}$suffix" ]; then
69			found=$1$suffix
70			break
71		fi
72	done
73
74	case $found in
75		*.tar.bz2 | *.tb2)
76			uzcmd='bzip2 -cd'
77			;;
78	esac
79	if [ -z "$found" ]; then
80		echo "$0: could not read \"$1\"." >&2
81	else
82		echo "$action \"$found\"." >&2
83		$uzcmd -- "$found" | tar "$tarparam" -
84	fi
85	shift
86done
87
88exit 0
89