241 lines
6.2 KiB
Bash
241 lines
6.2 KiB
Bash
#!/bin/sh
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# gzexe: compressor for Unix executables.
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# Use this only for binaries that you do not use frequently.
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#
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# The compressed version is a shell script which decompresses itself after
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# skipping $skip lines of shell commands. We try invoking the compressed
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# executable with the original name (for programs looking at their name).
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# We also try to retain the original file permissions on the compressed file.
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# For safety reasons, gzexe will not create setuid or setgid shell scripts.
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# WARNING: the first line of this file must be either : or #!/bin/sh
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# The : is required for some old versions of csh.
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# On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5
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# Copyright (C) 1998, 2002, 2004, 2006-2007, 2010-2018 Free Software
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# Foundation, Inc.
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# Copyright (C) 1993 Jean-loup Gailly
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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tab=' '
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nl='
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'
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IFS=" $tab$nl"
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version='gzexe (gzip) 1.10
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Copyright (C) 2007, 2011-2018 Free Software Foundation, Inc.
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This is free software. You may redistribute copies of it under the terms of
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the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.
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There is NO WARRANTY, to the extent permitted by law.
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Written by Jean-loup Gailly.'
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usage="Usage: $0 [OPTION] FILE...
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Replace each executable FILE with a compressed version of itself.
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Make a backup FILE~ of the old version of FILE.
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-d Decompress each FILE instead of compressing it.
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--help display this help and exit
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--version output version information and exit
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Report bugs to <bug-gzip@gnu.org>."
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decomp=0
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res=0
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while :; do
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case $1 in
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-d) decomp=1; shift;;
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--h*) printf '%s\n' "$usage" || exit 1; exit;;
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--v*) printf '%s\n' "$version" || exit 1; exit;;
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--) shift; break;;
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*) break;;
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esac
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done
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if test $# -eq 0; then
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printf >&2 '%s\n' "$0: missing operand
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Try \`$0 --help' for more information."
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exit 1
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fi
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tmp=
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trap 'res=$?
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test -n "$tmp" && rm -f "$tmp"
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(exit $res); exit $res
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' 0 1 2 3 5 10 13 15
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mktemp_status=
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for i do
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case $i in
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-*) file=./$i;;
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*) file=$i;;
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esac
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if test ! -f "$file" || test ! -r "$file"; then
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res=$?
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printf >&2 '%s\n' "$0: $i is not a readable regular file"
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continue
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fi
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if test $decomp -eq 0; then
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if sed -e 1d -e 2q "$file" | grep "^skip=[0-9][0-9]*$" >/dev/null; then
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printf >&2 '%s\n' "$0: $i is already gzexe'd"
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continue
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fi
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fi
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if test -u "$file"; then
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printf >&2 '%s\n' "$0: $i has setuid permission, unchanged"
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continue
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fi
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if test -g "$file"; then
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printf >&2 '%s\n' "$0: $i has setgid permission, unchanged"
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continue
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fi
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case /$file in
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*/basename | */bash | */cat | */chmod | */cp | \
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*/dirname | */expr | */gzip | \
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*/ln | */mkdir | */mktemp | */mv | */printf | */rm | \
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*/sed | */sh | */sleep | */test | */tail)
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printf >&2 '%s\n' "$0: $i might depend on itself"; continue;;
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esac
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dir=`dirname "$file"` || dir=$TMPDIR
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test -d "$dir" && test -w "$dir" && test -x "$dir" || dir=/tmp
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test -n "$tmp" && rm -f "$tmp"
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if test -z "$mktemp_status"; then
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type mktemp >/dev/null 2>&1
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mktemp_status=$?
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fi
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case $dir in
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*/) ;;
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*) dir=$dir/;;
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esac
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if test $mktemp_status -eq 0; then
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tmp=`mktemp "${dir}gzexeXXXXXXXXX"`
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else
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tmp=${dir}gzexe$$
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fi && { cp -p "$file" "$tmp" 2>/dev/null || cp "$file" "$tmp"; } || {
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res=$?
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printf >&2 '%s\n' "$0: cannot copy $file"
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continue
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}
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if test -w "$tmp"; then
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writable=1
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else
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writable=0
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chmod u+w "$tmp" || {
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res=$?
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printf >&2 '%s\n' "$0: cannot chmod $tmp"
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continue
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}
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fi
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if test $decomp -eq 0; then
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(cat <<'EOF' &&
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#!/bin/sh
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skip=44
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tab=' '
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nl='
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'
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IFS=" $tab$nl"
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umask=`umask`
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umask 77
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gztmpdir=
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trap 'res=$?
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test -n "$gztmpdir" && rm -fr "$gztmpdir"
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(exit $res); exit $res
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' 0 1 2 3 5 10 13 15
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case $TMPDIR in
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/ | /*/) ;;
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/*) TMPDIR=$TMPDIR/;;
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*) TMPDIR=/tmp/;;
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esac
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if type mktemp >/dev/null 2>&1; then
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gztmpdir=`mktemp -d "${TMPDIR}gztmpXXXXXXXXX"`
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else
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gztmpdir=${TMPDIR}gztmp$$; mkdir $gztmpdir
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fi || { (exit 127); exit 127; }
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gztmp=$gztmpdir/$0
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case $0 in
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-* | */*'
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') mkdir -p "$gztmp" && rm -r "$gztmp";;
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*/*) gztmp=$gztmpdir/`basename "$0"`;;
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esac || { (exit 127); exit 127; }
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case `printf 'X\n' | tail -n +1 2>/dev/null` in
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X) tail_n=-n;;
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*) tail_n=;;
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esac
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if tail $tail_n +$skip <"$0" | gzip -cd > "$gztmp"; then
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umask $umask
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chmod 700 "$gztmp"
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(sleep 5; rm -fr "$gztmpdir") 2>/dev/null &
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"$gztmp" ${1+"$@"}; res=$?
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else
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printf >&2 '%s\n' "Cannot decompress $0"
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(exit 127); res=127
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fi; exit $res
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EOF
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gzip -cv9 "$file") > "$tmp" || {
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res=$?
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printf >&2 '%s\n' "$0: compression not possible for $i, file unchanged."
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continue
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}
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else
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# decompression
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skip=44
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skip_line=`sed -e 1d -e 2q "$file"`
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case $skip_line in
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skip=[0-9] | skip=[0-9][0-9] | skip=[0-9][0-9][0-9])
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eval "$skip_line";;
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esac
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case `printf 'X\n' | tail -n +1 2>/dev/null` in
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X) tail_n=-n;;
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*) tail_n=;;
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esac
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tail $tail_n +$skip "$file" | gzip -cd > "$tmp" || {
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res=$?
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printf >&2 '%s\n' "$0: $i probably not in gzexe format, file unchanged."
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continue
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}
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fi
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test $writable -eq 1 || chmod u-w "$tmp" || {
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res=$?
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printf >&2 '%s\n' "$0: $tmp: cannot chmod"
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continue
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}
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ln -f "$file" "$file~" 2>/dev/null || {
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# Hard links may not work. Fall back on rm+cp so that $file always exists.
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rm -f "$file~" && cp -p "$file" "$file~"
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} || {
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res=$?
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printf >&2 '%s\n' "$0: cannot backup $i as $i~"
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continue
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}
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mv -f "$tmp" "$file" || {
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res=$?
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printf >&2 '%s\n' "$0: cannot rename $tmp to $i"
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continue
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}
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tmp=
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done
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(exit $res); exit $res
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