#!/bin/sh -

# z -- safely (un)tar and (de)feather files and directories
# Steve Kinzler, kinzler@cs.indiana.edu, May 89/Jun 93/Aug 99/Dec 00
# see website http://www.cs.indiana.edu/~kinzler/z/
# http://www.cs.indiana.edu/~kinzler/home.html#unix

#   Copyright
#
#       Copyright (C) 1989 Stephen B Kinzler <kinzler@cs.indiana.edu>
#
#   License
#
#       This program 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 2 of the License, or
#       (at your option) any later version.
#
#       This program 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/>.

#version=2.1.15
#version=2.2.0	# ?? Aug 99: added .zip & zip/unzip support
#version=2.3.0	# 04 Dec 00: added .bz2 & bzip2 support
#version=2.4.0	# 23 Sep 02: added -l/-L options
#version=2.5.0	# 17 Feb 09: added .jar support
#version=2.6.0	#  5 Nov 09: added lzip support
		#	     by Antonio Diaz Diaz <ant_diaz@teleline.es>
version=2.6.1	#  4 Dec 09: added -q option, copyright/GPL for debian pkg

GZIP=; ZIPOPT=; UNZIP=; export GZIP ZIPOPT UNZIP

table=
verbose=; quiet=-q
report=
command=compress
tag=Z
qopts=
suffix=.tar.Z
mode=go-rwx
preserve=p
bad=

dfltopts="-T -V -L -Z -s $suffix -m $mode -p"

set x $ZOPTS ${1+"$@"}; shift

while :
do
	case $# in
	0)	break;;
	*)	case "$1" in
		-t)	table=t;;
		-T)	table=;;
		-v)	verbose=-v; quiet=;;
		-V|-q)	verbose=;   quiet=-q;;
		-l)	report=t;;
		-L)	report=;;
		-gz)	command=gzip;	  tag=gz;;
		-z)	command=gzip;	  tag=z;;
		-I)	command=bzip2;	  tag=bz2;;
		-lz)	command=lzip;	  tag=lz;;
		-Z)	command=compress; tag=Z;;
		-zip)	command=zip;	  tag=zip;;
		-jar)	command=zip;	  tag=jar;;
		-[1-9])	qopts="$qopts $1";;
		--fast)	qopts="$qopts -1";;
		--best)	qopts="$qopts -9";;
		-s)	shift; suffix="$1";;
		-m)	shift; mode="$1";;
		-p)	preserve=p;;
		-P)	preserve=;;

		--)	shift; break;;
		-h)	bad=t; break;;
		-*)	bad=t; echo "$0: unknown option ($1)" 1>&2;;
		*)	break;;
		esac
		shift;;
	esac
done

case "$#,$bad" in
0,*|*,?*)	cat << EOF 1>&2
usage: $0 [ -t | -T ] [ -v | -V ] [ -l | -L ]
       [ -gz | -z | -I | -lz | -Z | -zip | -jar ] [ -# ] [ -s suffix ]
       [ -m mode ] [ -p | -P ] [ -h ] [ -- ] file ...
where "file" is a file, a directory, a feathered file ending
in .{Z,gz,z,bz2,lz}, or a tarred and feathered file ending in
.{tar.,tar,ta,t}{Z,gz,z,bz2,lz} or .{zip,jar}.
	-t	only list table of contents of given files
	-T	(un)tar and (de)feather given files
	-v	verbose output, eg report compression ratios when feathering
	-V,-q	non-verbose output
	-l	list the resulting files and directories
	-L	don't list the resulting files and directories
	-gz	use gzip and a .gz suffix when feathering
	-z	use gzip and a .z suffix when feathering
	-I	use bzip2 and a .bz2 suffix when feathering
	-lz	use lzip and a .lz suffix when feathering
	-Z	use compress and a .Z suffix when feathering
	-zip	use zip and a .zip suffix when feathering
	-jar	use zip and a .jar suffix when feathering
	-#	where # is 1 thru 9 is passed to *zip*, also --fast or --best
	-s	create tar and feather files with the given suffix style
	-m	apply the given chmod argument to created tar and feather files
	-p	preserve modes when untarring
	-P	don't preserve modes when untarring
	-h	just print this help message
	--	remaining arguments are to be taken as files
Defaults are "$dfltopts"
and as overridden by ZOPTS, currently "$ZOPTS".
Version $version
EOF
		exit 1;;
esac

###############################################################################

iwd=`pwd` || exit 2

tmp=/tmp/z$$
trap 'rm -f $tmp; exit 4' 1 2 13 15

for arg
do
	cd "$iwd" || exit 3

	case "$arg" in
	*/)	arg=`echo "$arg" | sed 's,/*$,,'`;;
	esac

	case "$arg" in
	*/*)	cd  `echo "$arg" | sed 's,[^/]*$,,'` || continue
		arg=`echo "$arg" | sed 's,.*/,,'`;;
	esac

	case "$arg" in

###############################################################################
# defeather and untar feathered tar files
###############################################################################

	*.tar.[Zz]|*.tar[Zz]|*.ta[Zz]|*.t[Zz]|*.tar.gz|*.targz|*.tagz|*.tgz|*.tar.bz2|*.tarbz2|*.tabz2|*.tbz2|*.tar.lz|*.tlz|*.zip|*.jar)
		case "$arg" in
		*Z)		ucommand=uncompress;   utag=Z;;
		*zip|*jar)	ucommand=unzip;        utag=;;
		*bz2)		ucommand='bzip2 -d';   utag=bz2;;
		*lz)		ucommand='lzip -d';    utag=lz;;
		*)		ucommand='gzip -d -n'; utag=z;;
		esac

		case "$table" in
		?*)	echo "$arg:"
			case "$ucommand" in
			unzip*)	$ucommand -l $verbose "$arg";;
			*)	$ucommand < "$arg" | tar -tvf -;;
			esac
			continue;;
		esac

		case "$arg" in
		*.zip|*.jar)
			tarf="$arg"
			dirf=`echo "$tarf" | sed 's/\.[^\.]*$//'`;;
		*.tar.[Zz]|*.tar.gz|*.tar.bz2|*.tar.lz)
			tarf=`echo "$arg"  | sed 's/\.[^\.]*$//'`
			dirf=`echo "$tarf" | sed 's/.tar$//'`;;
		*)
			dirf=`echo "$arg"  | sed 's/\.[^\.]*$//'`
			tarf="$dirf".tar;;
		esac

		if test "$tarf" != "$arg" -a \( -f "$tarf" -o -d "$tarf" \)
		then
			echo "$0: $tarf already exists" 1>&2
			continue
		elif test -f "$dirf" -o -d "$dirf"
		then
			echo "$0: $dirf already exists" 1>&2
			continue
		fi

		case "$arg" in
		*.tar.[Zz]|*.tar.gz|*.tar.bz2|*.tar.lz|*.zip|*.jar)
			;;
		*)
			if test -f "$tarf".$utag -o -d "$tarf".$utag
			then
				echo "$0: $tarf.$utag already exists" 1>&2
				continue
			fi
			mv "$arg" "$tarf".$utag || continue
			arg="$tarf".$utag;;
		esac

		case "$arg" in
		*.zip|*.jar)
			mkdir "$dirf" || continue
			cd "$dirf"    || continue
			$ucommand -q ../"$arg" 2>&1 | tee $tmp 1>&2;;

		*)
			$ucommand "$arg"
			if test -f "$arg" -o ! -s "$tarf"
			then
				echo "$0: cannot defeather $arg" 1>&2
				continue
			fi

			mkdir "$dirf" || continue
			cd "$dirf"    || continue
			tar -x${preserve}f ../"$tarf" 2>&1 | tee $tmp 1>&2;;
		esac

		if test ! -s $tmp
		then
			ls -a | sed '/^\.$/d; /^\.\.$/d' > $tmp
			nfiles=`wc -l < $tmp`

			case "`echo $nfiles`" in
			0)	cat << EOF 1>&2
$0: warning: keeping empty tar file $tarf; untarred as directory $dirf
EOF
				;;

			1)	rm ../"$tarf"
				case "`cat $tmp`" in
				"$dirf")	cd ..			     &&
						mv "$dirf" "$dirf".Z$$	     &&
						    mv "$dirf".Z$$/"$dirf" . &&
						    rmdir "$dirf".Z$$;;
				*)		cat << EOF 1>&2
$0: untarred $tarf in directory $dirf
EOF
						;;
				esac;;

			*)	rm ../"$tarf"
				cat << EOF 1>&2
$0: untarred $tarf in directory $dirf
EOF
				;;
			esac

		else
			cat << EOF 1>&2
$0: cannot untar $tarf; remnants in directory $dirf
EOF
		fi

		case "$report" in
		?*)	echo "$dirf";;
		esac

		rm -f $tmp;;

###############################################################################
# defeather plain feathered files
###############################################################################

	*.[Zz]|*.gz|*.bz2|*.lz)
		case "$table" in
		?*)	echo "$arg:"; continue;;
		esac

		case "$arg" in
		*Z)	ucommand=uncompress;;
		*bz2)	ucommand='bzip2 -d';;
		*lz)	ucommand='lzip -d';;
		*)	ucommand='gzip -d -n';;
		esac

		file=`echo "$arg" | sed 's/\.[^\.]*$//'`
		if test -f "$file" -o -d "$file"
		then
			echo "$0: $file already exists" 1>&2
		else
			$ucommand "$arg"
			case "$report" in
			?*)	echo "$file";;
			esac
		fi;;

###############################################################################

	*)
		case "$command" in
		compress)	cargs="$verbose -f";;
		gzip)		cargs="$verbose -S .$tag $qopts";;
		bzip2)		cargs="$verbose $qopts";;
		lzip)		cargs="$verbose $qopts";;
		zip)		cargs="$quiet -r -y -m -T $qopts";;
		*)		cat << EOF 1>&2
$0: unsupported feather command ($command), skipping $arg
EOF
				continue;;
		esac

###############################################################################
# tar and feather directories
###############################################################################

		if test -d "$arg"
		then
			case "$table" in
			?*)	echo "$arg:"
				ls -al "$arg"
				continue;;
			esac

			case "$suffix" in
			.tar.[Zz]|.tar.gz|tar.[Zz]|tar.gz)  suffix=.tar.$tag;;
			.tar.bz2|tar.bz2)		    suffix=.tar.$tag;;
			.tar.lz|tar.lz)			    suffix=.tar.$tag;;
			.tar[Zz]|.targz|tar[Zz]|targz)	    suffix=.tar$tag;;
			.tarbz2|tarbz2)			    suffix=.tar$tag;;
			.ta[Zz]|.tagz|ta[Zz]|tagz)	    suffix=.ta$tag;;
			.tabz2|tabz2)			    suffix=.ta$tag;;
			.t[Zz]|.tgz|t[Zz]|tgz)		    suffix=.t$tag;;
			.zip|zip|.jar|jar|.tbz2|tbz2)	    suffix=.t$tag;;
			.tlz|tlz)			    suffix=.t$tag;;
			*)				    cat << EOF 1>&2
$0: invalid tar and feather suffix ($suffix), skipping $arg
EOF
							    continue;;
			esac
			case "$command" in
			zip)	suffix=.$tag;;
			esac

			if test $command != zip -a \
				\( -f "$arg".tar -o -d "$arg".tar \)
			then
				echo "$0: $arg.tar already exists" 1>&2
				continue
			elif test $command != zip -a \
				 \( -f "$arg".tar.$tag -o -d "$arg".tar.$tag \)
			then
				echo "$0: $arg.tar.$tag already exists" 1>&2
				continue
			elif test -f "$arg"$suffix -o -d "$arg"$suffix
			then
				echo "$0: $arg$suffix already exists" 1>&2
				continue
			fi

			dmode=`ls -dl "$arg" | sed '
				s/^d\([^ ]*\).*/\1/
				s/rw./6/g; s/r-./4/g; s/-w./2/g; s/--./0/g'`
			case "$dmode" in
			[0246][0246][0246])	;;
			*)			cat << EOF 1>&2
$0: cannot determine directory modes ($arg), using 600
EOF
						dmode=600;;
			esac

			case "$command" in
			zip)	$command $cargs "$arg"$suffix "$arg"
				chmod $dmode "$arg"$suffix

				case "$mode" in
				-)	;;
				?*)	chmod "$mode" "$arg"$suffix;;
				esac

				case "$report" in
				?*)	echo "$arg"$suffix;;
				esac
				continue;;
			esac

			> "$arg".tar		|| continue
			chmod $dmode "$arg".tar ||
				{ rm -f "arg".tar; continue; }

			case "$mode" in
			-)	;;
			?*)	chmod "$mode" "$arg".tar ||
					{ rm -f "$arg".tar; continue; };;
			esac

			tar -cf "$arg".tar "$arg" 2>&1 | tee $tmp 1>&2

			if test ! -s $tmp -a -s "$arg".tar
			then
				rm -r "$arg" &
				$command $cargs "$arg".tar
				case "$arg".tar.$tag in
				"$arg"$suffix)	;;
				*)	test -f "$arg".tar.$tag &&
					    mv "$arg".tar.$tag "$arg"$suffix;;
				esac
				case "$report" in
				?*)	echo "$arg"$suffix;;
				esac
				wait
			else
				rm -f "$arg".tar
				echo "$0: $arg$suffix not created" 1>&2
			fi

			rm -f $tmp

###############################################################################
# feather plain files
###############################################################################

		else
			case "$table" in
			?*)	echo "$arg:"; continue;;
			esac

			if test -f "$arg".$tag -o -d "$arg".$tag
			then
				echo "$0: $arg.$tag already exists" 1>&2
			else
				case "$command" in
				zip)	$command $cargs "$arg".$tag "$arg";;
				*)	$command $cargs "$arg";;
				esac
				case "$report" in
				?*)	echo "$arg".$tag;;
				esac
			fi

		fi;;
	esac
done