usr.bin/gzip/znew

   1 #!/bin/sh -
   2 #
   3 # $NetBSD: znew,v 1.3 2008/04/27 09:07:13 nakayama Exp $
   4 # $OpenBSD: znew,v 1.2 2003/08/05 18:22:17 deraadt Exp $
   5 #
   6 # Copyright (c) 2003 Otto Moerbeek <otto@drijf.net>
   7 #
   8 # Permission to use, copy, modify, and distribute this software for any
   9 # purpose with or without fee is hereby granted, provided that the above
  10 # copyright notice and this permission notice appear in all copies.
  11 #
  12 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  13 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  14 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  15 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  16 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  17 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  18 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  19 #
  20
  21 # Return 0 if the first arg file size is smaller than the second, 1 otherwise.
  22 smaller () {
  23         a=`du -k "$1" | awk '{ print $1 }'`
  24         b=`du -k "$2" | awk '{ print $1 }'`
  25         test $a -lt $b
  26 }
  27
  28 # Check gzip integrity if the -t flag is specified
  29 checkfile () {
  30         if test $tflag -eq 1; then
  31                 gzip -qt < "$1"
  32         fi
  33 }
  34
  35 # Decompress a file and then gzip it
  36 process () {
  37         prefix="${1%.Z}"
  38         filez="$prefix".Z
  39         filegz="$prefix".gz
  40
  41         if test ! -e "$filez"; then
  42                 echo "$prog: $filez does not exist"
  43                 return 1
  44         fi
  45         if test ! -f "$filez"; then
  46                 echo "$prog: $filez is not a regular file"
  47                 return 1
  48         fi
  49         if test -e "$filegz" -a $fflag -eq 0; then
  50                 echo "$prog: $filegz already exists"
  51                 return 1
  52         fi
  53
  54         tmp=`mktemp /tmp/znewXXXXXXXXXX` || {
  55                 echo "$prog: cannot create tmp file"
  56                 return 1
  57         }
  58         trap 'rm -f "$tmp"; exit 1' HUP INT QUIT PIPE TERM
  59
  60         # Do the actual work, producing a file "$tmp"
  61         if uncompress -f -c < "$filez" | gzip -f $gzipflags > "$tmp"; then
  62
  63                 if test $kflag -eq 1 && smaller "$filez" "$tmp"; then
  64                         echo -n "$prog: $filez is smaller than $filegz"
  65                         echo "; keeping it"
  66                         rm -f "$tmp"
  67                         return 0
  68                 fi
  69                 if ! checkfile "$tmp"; then
  70                         echo "$prog: integrity check of $tmp failed"
  71                         rm -f "$tmp"
  72                         return 1;
  73                 fi
  74
  75                 # Try to keep the mode of the original file
  76                 if ! cp -fp "$filez" "$filegz"; then
  77                         echo "$prog: warning: could not keep mode of $filez"
  78                 fi
  79                 if  ! cp "$tmp" "$filegz" 2> /dev/null; then
  80                         echo "$prog: warning: could not keep mode of $filez"
  81                         if ! cp -f "$tmp" "$filegz" 2> /dev/null; then
  82                                 echo "$prog: could not copy $tmp to $filegz"
  83                                 rm -f "$filegz" "$tmp"
  84                                 return 1
  85                         fi
  86                 fi
  87                 if ! touch -fr "$filez" "$filegz"; then
  88                         echo -n "$prog: warning: could not keep timestamp of "
  89                         echo "$filez"
  90                 fi
  91                 rm -f "$filez" "$tmp"
  92         else
  93                 echo "$prog: failed to process $filez"
  94                 rm -f "$tmp"
  95                 return 1
  96         fi
  97 }
  98
  99 prog=`basename "$0"`
 100 usage="usage: $prog [-9fKtv] file ..."
 101
 102 fflag=0
 103 tflag=0
 104 kflag=0
 105 gzipflags=
 106
 107 # -P flag is recognized to maintain compatibility, but ignored. Pipe mode is
 108 # always used
 109 while getopts :ftv9PK i; do
 110         case $i in
 111                 f) fflag=1;;
 112                 t) tflag=1;;
 113                 v) gzipflags="-v $gzipflags";;
 114                 9) gzipflags="-9 $gzipflags";;
 115                 P) ;;
 116                 K) kflag=1;;
 117                 \?) echo "$usage"; exit 1;;
 118         esac
 119 done
 120
 121 shift $((OPTIND - 1))
 122
 123 if test $# -eq 0; then
 124         echo "$usage"
 125         exit 1
 126 fi
 127
 128 rc=0
 129
 130 while test $# -ne 0; do
 131         if ! process "$1"; then
 132                 rc=$?
 133         fi
 134         shift
 135 done
 136 exit $rc