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"
46 trap "rm -f $tmp; exit 1" 1 2 3 5 10 13 15
50 test "$x" = "ungzexe" && decomp=1
51 if test "x$1" = "x-d"; then
58 if test -z "`(${CPMOD-cpmod} zfoo1$$ zfoo2$$) 2>&1`"; then
64 IFS="${IFS= }"; saveifs="$IFS"; IFS="${IFS}:"
66 test -z "$dir" && dir=.
67 if test -f $dir/tail; then
73 if test -z "$tail"; then
77 case `echo foo | $tail -n +1 2>/dev/null` in
78 foo) tail="$tail -n";;
82 if test ! -f "$i" ; then
83 echo ${x}: $i not a file
87 if test $decomp -eq 0; then
88 if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
89 echo "${x}: $i is already gzexe'd"
93 if ls -l "$i" | grep '^...[sS]' > /dev/null; then
94 echo "${x}: $i has setuid permission, unchanged"
97 if ls -l "$i" | grep '^......[sS]' > /dev/null; then
98 echo "${x}: $i has setgid permission, unchanged"
101 case "`basename $i`" in
102 gzip | tail | sed | chmod | ln | sleep | rm)
103 echo "${x}: $i would depend on itself"; continue ;;
105 if test -z "$cpmod"; then
106 cp -p "$i" $tmp 2>/dev/null || cp "$i" $tmp
107 if test -w $tmp 2>/dev/null; then
111 chmod u+w $tmp 2>/dev/null
114 if test $decomp -eq 0; then
116 sed "s|^if tail|if $tail|" >> $tmp <<'EOF'
121 if tail +$skip "$0" | "BINDIR"/gzip -cd > /tmp/gztmp$$; then
123 /bin/chmod 700 /tmp/gztmp$$
124 prog="`echo $0 | /bin/sed 's|^.*/||'`"
125 if /bin/ln /tmp/gztmp$$ "/tmp/$prog" 2>/dev/null; then
126 trap '/bin/rm -f /tmp/gztmp$$ "/tmp/$prog"; exit $res' 0
127 (/bin/sleep 5; /bin/rm -f /tmp/gztmp$$ "/tmp/$prog") 2>/dev/null &
128 /tmp/"$prog" ${1+"$@"}; res=$?
130 trap '/bin/rm -f /tmp/gztmp$$; exit $res' 0
131 (/bin/sleep 5; /bin/rm -f /tmp/gztmp$$) 2>/dev/null &
132 /tmp/gztmp$$ ${1+"$@"}; res=$?
135 echo Cannot decompress $0; exit 1
138 gzip -cv9 "$i" >> $tmp || {
140 echo ${x}: compression not possible for $i, file unchanged.
148 if sed -e 1d -e 2q "$i" | grep "^skip=[0-9][0-9]*$" >/dev/null; then
149 eval `sed -e 1d -e 2q "$i"`
151 if tail +$skip "$i" | gzip -cd > $tmp; then
154 echo ${x}: $i probably not in gzexe format, file unchanged.
161 echo ${x}: cannot backup $i as $i~
166 mv $tmp "$i" || cp -p $tmp "$i" 2>/dev/null || cp $tmp "$i" || {
167 echo ${x}: cannot create $i
173 if test -n "$cpmod"; then
174 $cpmod "$i~" "$i" 2>/dev/null
175 elif test $writable -eq 0; then
176 chmod u-w $i 2>/dev/null