2 # gzexe: compressor for Unix executables.
3 # Use this only for binaries that you do not use frequently.
5 # The compressed version is a shell script which decompresses itself after
6 # skipping $skip lines of shell commands. We try invoking the compressed
7 # executable with the original name (for programs looking at their name).
8 # We also try to retain the original file permissions on the compressed file.
9 # For safety reasons, gzexe will not create setuid or setgid shell scripts.
11 # WARNING: the first line of this file must be either : or #!/bin/sh
12 # The : is required for some old versions of csh.
13 # On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5
16 # Copyright (C) 1998, 2002 Free Software Foundation
17 # Copyright (C) 1993 Jean-loup Gailly
19 # This program is free software; you can redistribute it and/or modify
20 # it under the terms of the GNU General Public License as published by
21 # the Free Software Foundation; either version 2, or (at your option)
24 # This program is distributed in the hope that it will be useful,
25 # but WITHOUT ANY WARRANTY; without even the implied warranty of
26 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 # GNU General Public License for more details.
29 # You should have received a copy of the GNU General Public License
30 # along with this program; if not, write to the Free Software
31 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
38 echo compress executables. original
file foo is renamed to foo~
39 echo usage
: ${x} [-d] files...
40 echo " -d decompress the executables"
46 trap "rm -f $tmp; exit 1" HUP INT QUIT TRAP USR1 PIPE TERM
51 test "$x" = "ungzexe" && decomp
=1
52 if test "x$1" = "x-d"; then
57 echo hi
> zfoo1$$ ||
exit 1
58 echo hi
> zfoo2$$ ||
exit 1
59 if test -z "`(${CPMOD-cpmod} zfoo1$$ zfoo2$$) 2>&1`"; then
65 IFS
="${IFS= }"; saveifs
="$IFS"; IFS
="${IFS}:"
67 test -z "$dir" && dir
=.
68 if test -f $dir/tail; then
74 if test -z "$tail"; then
78 case `echo foo | $tail -n +1 2>/dev/null` in
79 foo
) tail="$tail -n";;
83 if test ! -f "$i" ; then
84 echo ${x}: $i not a
file
88 if test $decomp -eq 0; then
89 if sed -e 1d
-e 2q
"$i" |
grep "^skip=[0-9]*$" >/dev
/null
; then
90 echo "${x}: $i is already gzexe'd"
94 if ls -l "$i" |
grep '^...[sS]' > /dev
/null
; then
95 echo "${x}: $i has setuid permission, unchanged"
98 if ls -l "$i" |
grep '^......[sS]' > /dev
/null
; then
99 echo "${x}: $i has setgid permission, unchanged"
102 case "`basename $i`" in
103 bzip2 |
tail |
sed |
chmod |
ln |
sleep |
rm)
104 echo "${x}: $i would depend on itself"; continue ;;
106 if test -z "$cpmod"; then
107 cp -p "$i" $tmp 2>/dev
/null ||
cp "$i" $tmp
108 if test -w $tmp 2>/dev
/null
; then
112 chmod u
+w
$tmp 2>/dev
/null
114 : >|
$tmp # truncate the file, ignoring set -C
116 if test $decomp -eq 0; then
118 sed "s|^if tail|if $tail|" >> $tmp <<'EOF'
123 tmpfile=`tempfile -p gztmp -d /tmp` || exit 1
124 if tail +$skip "$0" | /bin/bzip2 -cd >> $tmpfile; then
126 /bin/chmod 700 $tmpfile
127 prog="`echo $0 | /bin/sed 's|^.*/||'`"
128 if /bin/ln $tmpfile "/tmp/$prog" 2>/dev/null; then
129 trap '/bin/rm -f $tmpfile "/tmp/$prog"; exit $res' 0
130 (/bin/sleep 5; /bin/rm -f $tmpfile "/tmp/$prog") 2>/dev/null &
131 /tmp/"$prog" ${1+"$@"}; res=$?
133 trap '/bin/rm -f $tmpfile; exit $res' 0
134 (/bin/sleep 5; /bin/rm -f $tmpfile) 2>/dev/null &
135 $tmpfile ${1+"$@"}; res=$?
138 echo Cannot decompress $0; exit 1
141 bzip2 -cv9 "$i" >> $tmp ||
{
143 echo ${x}: compression not possible
for $i, file unchanged.
151 if sed -e 1d
-e 2q
"$i" |
grep "^skip=[0-9]*$" >/dev
/null
; then
152 eval `sed -e 1d -e 2q "$i"`
154 if tail +$skip "$i" |
bzip2 -cd > $tmp; then
157 echo ${x}: $i probably not
in gzexe format
, file unchanged.
164 echo ${x}: cannot backup
$i as
$i~
169 mv $tmp "$i" ||
cp -p $tmp "$i" 2>/dev
/null ||
cp $tmp "$i" ||
{
170 echo ${x}: cannot create
$i
176 if test -n "$cpmod"; then
177 $cpmod "$i~" "$i" 2>/dev
/null
178 elif test $writable -eq 0; then
179 chmod u-w
$i 2>/dev
/null