151 lines
3.7 KiB
Bash
151 lines
3.7 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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x=`basename $0`
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if test $# = 0; then
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echo compress executables. original file foo is renamed to foo~
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echo usage: ${x} [-d] files...
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echo " -d decompress the executables"
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exit 1
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fi
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tmp=gz$$
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trap "rm -f $tmp; exit 1" 1 2 3 5 10 13 15
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decomp=0
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res=0
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test "$x" = "ungzexe" && decomp=1
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if test "x$1" = "x-d"; then
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decomp=1
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shift
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fi
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echo hi > zfoo1$$
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echo hi > zfoo2$$
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if test -z "`(${CPMOD-cpmod} zfoo1$$ zfoo2$$) 2>&1`"; then
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cpmod=${CPMOD-cpmod}
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fi
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rm -f zfoo[12]$$
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tail=""
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IFS="${IFS= }"; saveifs="$IFS"; IFS="${IFS}:"
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for dir in $PATH; do
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test -z "$dir" && dir=.
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if test -f $dir/tail; then
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tail="$dir/tail"
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break
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fi
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done
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IFS="$saveifs"
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if test -z "$tail"; then
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echo cannot find tail
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exit 1
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fi
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for i do
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if test ! -f "$i" ; then
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echo ${x}: $i not a file
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res=1
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continue
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fi
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if test $decomp -eq 0; then
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if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
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echo "${x}: $i is already gzexe'd"
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continue
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fi
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fi
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if ls -l "$i" | grep '^...[sS]' > /dev/null; then
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echo "${x}: $i has setuid permission, unchanged"
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continue
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fi
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if ls -l "$i" | grep '^......[sS]' > /dev/null; then
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echo "${x}: $i has setgid permission, unchanged"
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continue
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fi
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case "`basename $i`" in
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sh | gzip | tail | chmod | ln | sleep | rm)
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echo "${x}: $i would depend on itself"; continue ;;
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esac
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if test -z "$cpmod"; then
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cp -p "$i" $tmp 2>/dev/null || cp "$i" $tmp
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if test -w $tmp 2>/dev/null; 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 2>/dev/null
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fi
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fi
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if test $decomp -eq 0; then
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sed 1q $0 > $tmp
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sed "s|^if tail|if $tail|" >> $tmp <<'EOF'
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skip=18
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if tail +$skip $0 | gzip -cd > /tmp/gztmp$$; then
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chmod 700 /tmp/gztmp$$
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prog="`echo $0 | sed 's|^.*/||'`"
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if /bin/ln /tmp/gztmp$$ "/tmp/$prog" 2>/dev/null; then
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trap '/bin/rm -f /tmp/gztmp$$ "/tmp/$prog"; exit $res' 0
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(/bin/sleep 5; /bin/rm -f /tmp/gztmp$$ "/tmp/$prog") 2>/dev/null &
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/tmp/"$prog" ${1+"$@"}; res=$?
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else
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trap '/bin/rm -f /tmp/gztmp$$; exit $res' 0
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(/bin/sleep 5; /bin/rm -f /tmp/gztmp$$) 2>/dev/null &
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/tmp/gztmp$$ ${1+"$@"}; res=$?
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fi
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else
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echo Cannot decompress $0; exit 1
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fi; exit $res
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EOF
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gzip -cv9 "$i" >> $tmp || {
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/bin/rm -f $tmp
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echo ${x}: compression not possible for $i, file unchanged.
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res=1
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continue
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}
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else
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# decompression
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skip=18
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if sed -e 1d -e 2q "$i" | grep "^skip=[0-9]*$" >/dev/null; then
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eval `sed -e 1d -e 2q "$i"`
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fi
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if tail +$skip "$i" | gzip -cd > $tmp; then
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:
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else
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echo ${x}: $i probably not in gzexe format, file unchanged.
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res=1
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continue
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fi
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fi
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rm -f "$i~"
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mv "$i" "$i~" || {
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echo ${x}: cannot backup $i as $i~
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rm -f $tmp
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res=1
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continue
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}
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mv $tmp "$i" || cp -p $tmp "$i" 2>/dev/null || cp $tmp "$i" || {
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echo ${x}: cannot create $i
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rm -f $tmp
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res=1
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continue
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}
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rm -f $tmp
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if test -n "$cpmod"; then
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$cpmod "$i~" "$i" 2>/dev/null
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elif test $writable -eq 0; then
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chmod u-w $i 2>/dev/null
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fi
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done
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exit $res
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