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|
#!/bin/ksh -
#
# $OpenBSD: znew,v 1.3 2005/07/22 09:34:16 jmc Exp $
#
# Copyright (c) 2003 Otto Moerbeek <otto@drijf.net>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Return 0 if the first arg file size is smaller than the second, 1 otherwise.
smaller () {
a=`du -k "$1" | awk '{ print $1 }'`
b=`du -k "$2" | awk '{ print $1 }'`
test $a -lt $b
}
# Check gzip integrity if the -t flag is specified
checkfile () {
if test $tflag -eq 1; then
gzip -qt < "$1"
fi
}
# Decompress a file and then gzip it
process () {
prefix="${1%.Z}"
filez="$prefix".Z
filegz="$prefix".gz
if test ! -e "$filez"; then
echo "$prog: $filez does not exist"
return 1
fi
if test ! -f "$filez"; then
echo "$prog: $filez is not a regular file"
return 1
fi
if test -e "$filegz" -a $fflag -eq 0; then
echo "$prog: $filegz already exists"
return 1
fi
tmp=`mktemp /tmp/znewXXXXXXXXXX` || {
echo "$prog: cannot create tmp file"
return 1
}
trap 'rm -f "$tmp"; exit 1' HUP INT QUIT PIPE TERM
# Do the actual work, producing a file "$tmp"
if uncompress -f -c < "$filez" | gzip -f $gzipflags -o "$tmp"; then
if test $kflag -eq 1 && smaller "$filez" "$tmp"; then
echo -n "$prog: $filez is smaller than $filegz"
echo "; keeping it"
rm -f "$tmp"
return 0
fi
if ! checkfile "$tmp"; then
echo "$prog: integrity check of $tmp failed"
rm -f "$tmp"
return 1;
fi
# Try to keep the mode of the original file
if ! cp -fp "$filez" "$filegz"; then
echo "$prog: warning: could not keep mode of $filez"
fi
if ! cp "$tmp" "$filegz" 2> /dev/null; then
echo "$prog: warning: could not keep mode of $filez"
if ! cp -f "$tmp" "$filegz" 2> /dev/null; then
echo "$prog: could not copy $tmp to $filegz"
rm -f "$filegz" "$tmp"
return 1
fi
fi
if ! touch -fr "$filez" "$filegz"; then
echo -n "$prog: warning: could not keep timestamp of "
echo "$filez"
fi
rm -f "$filez" "$tmp"
else
echo "$prog: failed to process $filez"
rm -f "$tmp"
return 1
fi
}
prog=`basename "$0"`
usage="usage: $prog [-9fKtv] file ..."
fflag=0
tflag=0
kflag=0
gzipflags=
# -P flag is recognized to maintain compatibility, but ignored. Pipe mode is
# always used
while getopts :ftv9PK i; do
case $i in
f) fflag=1;;
t) tflag=1;;
v) gzipflags="-v $gzipflags";;
9) gzipflags="-9 $gzipflags";;
P) ;;
K) kflag=1;;
\?) echo "$usage"; exit 1;;
esac
done
shift OPTIND-1
if test $# -eq 0; then
echo "$usage"
exit 1
fi
rc=0
while test $# -ne 0; do
if ! process "$1"; then
rc=$?
fi
shift
done
exit $rc
|
