diff options
Diffstat (limited to 'gzexe.in')
| -rw-r--r-- | gzexe.in | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/gzexe.in b/gzexe.in new file mode 100644 index 0000000..282e385 --- /dev/null +++ b/gzexe.in @@ -0,0 +1,227 @@ +#!/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, 2010-2016 Free Software +# Foundation, Inc. +# 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) @VERSION@ +Copyright (C) 2007, 2011-2016 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>." + +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` + else + tmp=$dir/gzexe$$ + fi && { cp -p "$file" "$tmp" 2>/dev/null || cp "$file" "$tmp"; } || { + res=$? + echo >&2 "$0: cannot copy $file" + continue + } + if test -w "$tmp"; then + writable=1 + else + writable=0 + chmod u+w "$tmp" || { + res=$? + echo >&2 "$0: cannot chmod $tmp" + continue + } + fi + if test $decomp -eq 0; then + (cat <<'EOF' && +#!/bin/sh +skip=44 + +tab=' ' +nl=' +' +IFS=" $tab$nl" + +umask=`umask` +umask 77 + +gztmpdir= +trap 'res=$? + test -n "$gztmpdir" && rm -fr "$gztmpdir" + (exit $res); exit $res +' 0 1 2 3 5 10 13 15 + +if type mktemp >/dev/null 2>&1; then + gztmpdir=`mktemp -d` +else + gztmpdir=/tmp/gztmp$$; 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 |