gzexe.in

   1 #!/bin/sh
   2 # gzexe: compressor for Unix executables.
   3 # Use this only for binaries that you do not use frequently.
   4 #
   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.
  10
  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
  14
  15
  16 # Copyright (C) 1998, 2002, 2004, 2006, 2007 Free Software Foundation
  17 # Copyright (C) 1993 Jean-loup Gailly
  18
  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 3 of the License, or
  22 # (at your option) any later version.
  23
  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.
  28
  29 # You should have received a copy of the GNU General Public License along
  30 # with this program; if not, write to the Free Software Foundation, Inc.,
  31 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  32
  33 tab='   '
  34 nl='
  35 '
  36 IFS=" $tab$nl"
  37
  38 version='gzexe (gzip) @VERSION@
  39 Copyright (C) 2007 Free Software Foundation, Inc.
  40 This is free software.  You may redistribute copies of it under the terms of
  41 the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
  42 There is NO WARRANTY, to the extent permitted by law.
  43
  44 Written by Jean-loup Gailly.'
  45
  46 usage="Usage: $0 [OPTION] FILE...
  47 Rename each FILE with a compressed version of itself, renaming FILE to FILE~.
  48
  49   -d             Decompress each FILE instead of compressing it.
  50       --help     display this help and exit
  51       --version  output version information and exit
  52
  53 Report bugs to <bug-gzip@gnu.org>."
  54
  55
  56 bindir=@bindir@
  57 case $1 in
  58 --__bindir) bindir=${2?}; shift; shift;;
  59 esac
  60 PATH=$bindir:$PATH
  61
  62 decomp=0
  63 res=0
  64 while :; do
  65   case $1 in
  66   -d) decomp=1; shift;;
  67   --h*) exec echo "$usage";;
  68   --v*) exec echo "$version";;
  69   --) shift; break;;
  70   *) break;;
  71   esac
  72 done
  73
  74 if test $# -eq 0; then
  75   echo >&2 "$0: missing operand
  76 Try \`$0 --help' for more information."
  77   exit 1
  78 fi
  79
  80 tmp=
  81 trap 'res=$?
  82   test -n "$tmp" && rm -f "$tmp"
  83   (exit $res); exit $res
  84 ' 0 1 2 3 5 10 13 15
  85
  86 mktemp_status=
  87
  88 for i do
  89   case $i in
  90   -*) file=./$i;;
  91   *)  file=$i;;
  92   esac
  93   if test ! -f "$file" || test ! -r "$file"; then
  94     res=$?
  95     echo >&2 "$0: $i is not a readable regular file"
  96     continue
  97   fi
  98   if test $decomp -eq 0; then
  99     if sed -e 1d -e 2q "$file" | grep "^skip=[0-9][0-9]*$" >/dev/null; then
 100       echo >&2 "$0: $i is already gzexe'd"
 101       continue
 102     fi
 103   fi
 104   if test -u "$file"; then
 105     echo >&2 "$0: $i has setuid permission, unchanged"
 106     continue
 107   fi
 108   if test -g "$file"; then
 109     echo >&2 "$0: $i has setgid permission, unchanged"
 110     continue
 111   fi
 112   case /$file in
 113   */basename | */bash | */cat | */chmod | */cp | \
 114   */dirname | */echo | */expr | */gzip | \
 115   */ln | */mkdir | */mktemp | */mv | */rm | \
 116   */sed | */sh | */sleep | */test | */tail)
 117     echo >&2 "$0: $i might depend on itself"; continue;;
 118   esac
 119
 120   dir=`dirname "$file"` || dir=$TMPDIR
 121   test -d "$dir" && test -w "$dir" && test -x "$dir" || dir=/tmp
 122   test -n "$tmp" && rm -f "$tmp"
 123   if test -z "$mktemp_status"; then
 124     type mktemp >/dev/null 2>&1
 125     mktemp_status=$?
 126   fi
 127   if test $mktemp_status -eq 0; then
 128     tmp=`TMPDIR=$dir mktemp -t gzexeXXXXXX`
 129   else
 130     tmp=$dir/gzexe$$
 131   fi && { cp -p "$file" "$tmp" 2>/dev/null || cp "$file" "$tmp"; } || {
 132     res=$?
 133     echo >&2 "$0: cannot copy $file"
 134     continue
 135   }
 136   if test -w "$tmp"; then
 137     writable=1
 138   else
 139     writable=0
 140     chmod u+w "$tmp" || {
 141       res=$?
 142       echo >&2 "$0: cannot chmod $tmp"
 143       continue
 144     }
 145   fi
 146   if test $decomp -eq 0; then
 147     (cat <<'EOF' &&
 148 #!/bin/sh
 149 skip=44
 150
 151 tab='   '
 152 nl='
 153 '
 154 IFS=" $tab$nl"
 155
 156 umask=`umask`
 157 umask 77
 158
 159 gztmpdir=
 160 trap 'res=$?
 161   test -n "$gztmpdir" && rm -fr "$gztmpdir"
 162   (exit $res); exit $res
 163 ' 0 1 2 3 5 10 13 15
 164
 165 if type mktemp >/dev/null 2>&1; then
 166   gztmpdir=`mktemp -dt`
 167 else
 168   gztmpdir=/tmp/gztmp$$; mkdir $gztmpdir
 169 fi || { (exit 127); exit 127; }
 170
 171 gztmp=$gztmpdir/$0
 172 case $0 in
 173 -* | */*'
 174 ') mkdir -p "$gztmp" && rm -r "$gztmp";;
 175 */*) gztmp=$gztmpdir/`basename "$0"`;;
 176 esac || { (exit 127); exit 127; }
 177
 178 case `echo X | tail -n +1 2>/dev/null` in
 179 X) tail_n=-n;;
 180 *) tail_n=;;
 181 esac
 182 if tail $tail_n +$skip <"$0" | gzip -cd > "$gztmp"; then
 183   umask $umask
 184   chmod 700 "$gztmp"
 185   (sleep 5; rm -fr "$gztmpdir") 2>/dev/null &
 186   "$gztmp" ${1+"$@"}; res=$?
 187 else
 188   echo >&2 "Cannot decompress $0"
 189   (exit 127); res=127
 190 fi; exit $res
 191 EOF
 192     gzip -cv9 "$file") > "$tmp" || {
 193       res=$?
 194       echo >&2 "$0: compression not possible for $i, file unchanged."
 195       continue
 196     }
 197
 198   else
 199     # decompression
 200     skip=44
 201     skip_line=`sed -e 1d -e 2q "$file"`
 202     case $skip_line in
 203     skip=[0-9] | skip=[0-9][0-9] | skip=[0-9][0-9][0-9])
 204       eval "$skip_line";;
 205     esac
 206     case `echo X | tail -n +1 2>/dev/null` in
 207     X) tail_n=-n;;
 208     *) tail_n=;;
 209     esac
 210     tail $tail_n +$skip "$file" | gzip -cd > "$tmp" || {
 211       res=$?
 212       echo >&2 "$0: $i probably not in gzexe format, file unchanged."
 213       continue
 214     }
 215   fi
 216   test $writable -eq 1 || chmod u-w "$tmp" || {
 217     res=$?
 218     echo >&2 "$0: $tmp: cannot chmod"
 219     continue
 220   }
 221   ln -f "$file" "$file~" || {
 222     res=$?
 223     echo >&2 "$0: cannot backup $i as $i~"
 224     continue
 225   }
 226   mv -f "$tmp" "$file" || {
 227     res=$?
 228     echo >&2 "$0: cannot rename $tmp to $i"
 229     continue
 230   }
 231   tmp=
 232 done
 233 (exit $res); exit $res