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#!/bin/sh
# gzexe: compressor for Unix executables.
# Use this only for binaries that you do not use frequently.
#
# The compressed version is a shell script which decompresses itself after
# skipping $skip lines of shell commands. We try invoking the compressed
# executable with the original name (for programs looking at their name).
# We also try to retain the original file permissions on the compressed file.
# For safety reasons, gzexe will not create setuid or setgid shell scripts.
# WARNING: the first line of this file must be either : or #!/bin/sh
# The : is required for some old versions of csh.
# On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5
# Copyright (C) 1998, 2002, 2004, 2006, 2007 Free Software Foundation
# Copyright (C) 1993 Jean-loup Gailly
# 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 3 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
tab=' '
nl='
'
IFS=" $tab$nl"
version='gzexe (gzip) 1.5
Copyright (C) 2007, 2011-2012 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.
Written by Jean-loup Gailly.'
usage="Usage: $0 [OPTION] FILE...
Rename each FILE with a compressed version of itself, renaming FILE to FILE~.
-d Decompress each FILE instead of compressing it.
--help display this help and exit
--version output version information and exit
Report bugs to <bug-gzip@gnu.org>."
bindir='/usr/bin'
case $1 in
--__bindir) bindir=${2?}; shift; shift;;
esac
PATH=$bindir:$PATH
decomp=0
res=0
while :; do
case $1 in
-d) decomp=1; shift;;
--h*) exec echo "$usage";;
--v*) exec echo "$version";;
--) shift; break;;
*) break;;
esac
done
if test $# -eq 0; then
echo >&2 "$0: missing operand
Try \`$0 --help' for more information."
exit 1
fi
tmp=
trap 'res=$?
test -n "$tmp" && rm -f "$tmp"
(exit $res); exit $res
' 0 1 2 3 5 10 13 15
mktemp_status=
for i do
case $i in
-*) file=./$i;;
*) file=$i;;
esac
if test ! -f "$file" || test ! -r "$file"; then
res=$?
echo >&2 "$0: $i is not a readable regular file"
continue
fi
if test $decomp -eq 0; then
if sed -e 1d -e 2q "$file" | grep "^skip=[0-9][0-9]*$" >/dev/null; then
echo >&2 "$0: $i is already gzexe'd"
continue
fi
fi
if test -u "$file"; then
echo >&2 "$0: $i has setuid permission, unchanged"
continue
fi
if test -g "$file"; then
echo >&2 "$0: $i has setgid permission, unchanged"
continue
fi
case /$file in
*/basename | */bash | */cat | */chmod | */cp | \
*/dirname | */echo | */expr | */gzip | \
*/ln | */mkdir | */mktemp | */mv | */rm | \
*/sed | */sh | */sleep | */test | */tail)
echo >&2 "$0: $i might depend on itself"; continue;;
esac
dir=`dirname "$file"` || dir=$TMPDIR
test -d "$dir" && test -w "$dir" && test -x "$dir" || dir=/tmp
test -n "$tmp" && rm -f "$tmp"
if test -z "$mktemp_status"; then
type mktemp >/dev/null 2>&1
mktemp_status=$?
fi
if test $mktemp_status -eq 0; then
tmp=`TMPDIR=$dir mktemp -t gzexeXXXXXX`
else
tmp=$dir/gzexe$$
fi && { cp -p "$file" "$tmp" 2>/dev/null || cp "$file" "$tmp"; } || {
res=$?
echo >&2 "$0: cannot copy $file"
continue
}
if test -w "$tmp"; then
writable=1
else
writable=0
chmod u+w "$tmp" || {
res=$?
echo >&2 "$0: cannot chmod $tmp"
continue
}
fi
if test $decomp -eq 0; then
(cat <<'EOF' &&
#!/bin/sh
skip=44
tab=' '
nl='
'
IFS=" $tab$nl"
umask=`umask`
umask 77
gztmpdir=
trap 'res=$?
test -n "$gztmpdir" && rm -fr "$gztmpdir"
(exit $res); exit $res
' 0 1 2 3 5 10 13 15
if type mktemp >/dev/null 2>&1; then
gztmpdir=`mktemp -dt`
else
gztmpdir=/tmp/gztmp$$; mkdir $gztmpdir
fi || { (exit 127); exit 127; }
gztmp=$gztmpdir/$0
case $0 in
-* | */*'
') mkdir -p "$gztmp" && rm -r "$gztmp";;
*/*) gztmp=$gztmpdir/`basename "$0"`;;
esac || { (exit 127); exit 127; }
case `echo X | tail -n +1 2>/dev/null` in
X) tail_n=-n;;
*) tail_n=;;
esac
if tail $tail_n +$skip <"$0" | gzip -cd > "$gztmp"; then
umask $umask
chmod 700 "$gztmp"
(sleep 5; rm -fr "$gztmpdir") 2>/dev/null &
"$gztmp" ${1+"$@"}; res=$?
else
echo >&2 "Cannot decompress $0"
(exit 127); res=127
fi; exit $res
EOF
gzip -cv9 "$file") > "$tmp" || {
res=$?
echo >&2 "$0: compression not possible for $i, file unchanged."
continue
}
else
# decompression
skip=44
skip_line=`sed -e 1d -e 2q "$file"`
case $skip_line in
skip=[0-9] | skip=[0-9][0-9] | skip=[0-9][0-9][0-9])
eval "$skip_line";;
esac
case `echo X | tail -n +1 2>/dev/null` in
X) tail_n=-n;;
*) tail_n=;;
esac
tail $tail_n +$skip "$file" | gzip -cd > "$tmp" || {
res=$?
echo >&2 "$0: $i probably not in gzexe format, file unchanged."
continue
}
fi
test $writable -eq 1 || chmod u-w "$tmp" || {
res=$?
echo >&2 "$0: $tmp: cannot chmod"
continue
}
ln -f "$file" "$file~" || {
res=$?
echo >&2 "$0: cannot backup $i as $i~"
continue
}
mv -f "$tmp" "$file" || {
res=$?
echo >&2 "$0: cannot rename $tmp to $i"
continue
}
tmp=
done
(exit $res); exit $res
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