3 # gzexe: compressor for Unix executables.
4 # Use this only for binaries that you do not use frequently.
6 # The compressed version is a shell script which decompresses itself after
7 # skipping $skip lines of shell commands. We try invoking the compressed
8 # executable with the original name (for programs looking at their name).
9 # We also try to retain the original file permissions on the compressed file.
10 # For safety reasons, gzexe will not create setuid or setgid shell scripts.
12 # WARNING: the first line of this file must be either : or #!/bin/sh
13 # The : is required for some old versions of csh.
14 # On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5
17 # Copyright (C) 1998, 2002 Free Software Foundation
18 # Copyright (C) 1993 Jean-loup Gailly
20 # This program is free software; you can redistribute it and/or modify
21 # it under the terms of the GNU General Public License as published by
22 # the Free Software Foundation; either version 2, or (at your option)
25 # This program is distributed in the hope that it will be useful,
26 # but WITHOUT ANY WARRANTY; without even the implied warranty of
27 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 # GNU General Public License for more details.
30 # You should have received a copy of the GNU General Public License
31 # along with this program; if not, write to the Free Software
32 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
39 echo compress executables. original file foo is renamed to foo~
40 echo usage: ${x} [-d] files...
41 echo " -d decompress the executables"
47 trap "rm -f $tmp; exit 1" HUP INT QUIT TRAP USR1 PIPE TERM
52 test "$x" = "ungzexe" && decomp=1
53 if test "x$1" = "x-d"; then
58 echo hi > zfoo1$$ || exit 1
59 echo hi > zfoo2$$ || exit 1
60 if test -z "`(${CPMOD-cpmod} zfoo1$$ zfoo2$$) 2>&1`"; then
66 IFS="${IFS= }"; saveifs="$IFS"; IFS="${IFS}:"
68 test -z "$dir" && dir=.
69 if test -f $dir/tail; then
75 if test -z "$tail"; then
79 case `echo foo | $tail -n +1 2>/dev/null` in
80 foo) tail="$tail -n";;
84 if test ! -f "$i" ; then
85 echo ${x}: $i not a file
89 if test $decomp -eq 0; then
90 if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
91 echo "${x}: $i is already gzexe'd"
95 if ls -l "$i" | grep '^...[sS]' > /dev/null; then
96 echo "${x}: $i has setuid permission, unchanged"
99 if ls -l "$i" | grep '^......[sS]' > /dev/null; then
100 echo "${x}: $i has setgid permission, unchanged"
103 case "`basename $i`" in
104 gzip | tail | sed | chmod | ln | sleep | rm)
105 echo "${x}: $i would depend on itself"; continue ;;
107 if test -z "$cpmod"; then
108 cp -p "$i" $tmp 2>/dev/null || cp "$i" $tmp
109 if test -w $tmp 2>/dev/null; then
113 chmod u+w $tmp 2>/dev/null
115 : >| $tmp # truncate the file, ignoring set -C
117 if test $decomp -eq 0; then
119 sed "s|^if tail|if $tail|" >> $tmp <<'EOF'
124 tmpfile=`tempfile -p gztmp -d /tmp` || exit 1
125 if tail +$skip "$0" | /bin/gzip -cd >> $tmpfile; then
127 /bin/chmod 700 $tmpfile
128 prog="`echo $0 | /bin/sed 's|^.*/||'`"
129 if /bin/ln $tmpfile "/tmp/$prog" 2>/dev/null; then
130 trap '/bin/rm -f $tmpfile "/tmp/$prog"; exit $res' 0
131 (/bin/sleep 5; /bin/rm -f $tmpfile "/tmp/$prog") 2>/dev/null &
132 /tmp/"$prog" ${1+"$@"}; res=$?
134 trap '/bin/rm -f $tmpfile; exit $res' 0
135 (/bin/sleep 5; /bin/rm -f $tmpfile) 2>/dev/null &
136 $tmpfile ${1+"$@"}; res=$?
139 echo Cannot decompress $0; exit 1
142 gzip -cv9 "$i" >> $tmp || {
144 echo ${x}: compression not possible for $i, file unchanged.
152 if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
153 eval `sed -e 1d -e 2q "$i"`
155 if tail +$skip "$i" | gzip -cd > $tmp; then
158 echo ${x}: $i probably not in gzexe format, file unchanged.
165 echo ${x}: cannot backup $i as $i~
170 mv $tmp "$i" || cp -p $tmp "$i" 2>/dev/null || cp $tmp "$i" || {
171 echo ${x}: cannot create $i
177 if test -n "$cpmod"; then
178 $cpmod "$i~" "$i" 2>/dev/null
179 elif test $writable -eq 0; then
180 chmod u-w $i 2>/dev/null