xz/xznew

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#!/bin/sh
# Copyright (C) 2015 Hans-Peter Jansen
# Copyright (C) 1998, 2002, 2004 Free Software Foundation
# 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 2 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.
PATH="/usr/bin:$PATH"; export PATH
check=0
pipe=0
opt=
files=
keep=0
res=0
old=0
new=0
block=1024
# block is the disk block size (best guess, need not be exact)
warn="(does not preserve modes and timestamp)"
tmp=`mktemp -d ${TMPDIR-/tmp}/zfoo.XXXXXX` || {
echo 'cannot create temporary directory' >&2
exit 1
}
trap "rm -rf $tmp/" 0 1 2 3 6 13 15
set -C
echo hi > $tmp/1
echo hi > $tmp/2
if test -z "`(${CPMOD-cpmod} $tmp/1 $tmp/2) 2>&1`"; then
cpmod=${CPMOD-cpmod}
warn=""
fi
if test -z "$cpmod" && ${TOUCH-touch} -r $tmp/1 $tmp/2 2>/dev/null; then
cpmod="${TOUCH-touch}"
cpmodarg="-r"
warn="(does not preserve file modes)"
fi
# check about xz extension
xz $tmp/1 &> /dev/null
ext=`echo $tmp/1* | sed "s|$tmp/1||"`
rm -rf $tmp/
trap - 0 1 2 3 6 13 15
if test -z "$ext"; then
echo xznew: error determining xz extension
exit 1
fi
if test "$ext" = ".gz"; then
echo xznew: cannot use .gz as xz extension.
exit 1
fi
for arg
do
case "$arg" in
-*) opt="$opt $arg"; shift;;
*) break;;
esac
done
if test $# -eq 0; then
echo "recompress .gz or .tgz files into $ext (xz) files"
echo usage: `echo $0 | sed 's,^.*/,,'` "[-tv9KP]" file.gz...
echo " -t tests the new files before deleting originals"
echo " -v be verbose"
echo " -9 use the slowest compression method (optimal compression)"
echo " -K keep a .gz file when it is smaller than the $ext file"
echo " -P use pipes for the conversion $warn"
exit 1
fi
opt=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'`
case "$opt" in
*t*) check=1; opt=`echo "$opt" | sed 's/t//g'`
esac
case "$opt" in
*K*) keep=1; opt=`echo "$opt" | sed 's/K//g'`
esac
case "$opt" in
*P*) pipe=1; opt=`echo "$opt" | sed 's/P//g'`
esac
if test -n "$opt"; then
opt="-$opt"
fi
for i do
m=`echo $i | sed 's/\.tgz$//'`
if test -f "$m.tgz" ; then
echo "Renaming file *.tgz to *.tar.gz"
mv "$i" "$m.tar.gz"
n=`echo $i | sed 's/\.tgz$/\.tar/'`
else
n=`echo $i | sed 's/\.gz$//'`
fi
if test ! -f "$n.gz" ; then
echo $n.gz not found
res=1; continue
fi
test $keep -eq 1 && old=`wc -c < "$n.gz"`
if test $pipe -eq 1; then
if gzip -d < "$n.gz" | xz $opt > "$n$ext"; then
# Copy file attributes from old file to new one, if possible.
test -n "$cpmod" && $cpmod $cpmodarg "$n.gz" "$n$ext" 2> /dev/null
else
echo error while recompressing $n.gz
res=1; continue
fi
else
if test $check -eq 1; then
if cp -p "$n.gz" "$n.$$" 2> /dev/null || cp "$n.gz" "$n.$$"; then
:
else
echo cannot backup "$n.gz"
res=1; continue
fi
fi
if gzip -d "$n.gz"; then
:
else
test $check -eq 1 && mv "$n.$$" "$n.gz"
echo error while uncompressing $n.gz
res=1; continue
fi
if xz $opt "$n"; then
:
else
if test $check -eq 1; then
mv "$n.$$" "$n.gz" && rm -f "$n"
echo error while recompressing $n
else
# gzip $n (might be dangerous if disk full)
echo error while recompressing $n, left uncompressed
fi
res=1; continue
fi
fi
test $keep -eq 1 && new=`wc -c < "$n$ext"`
if test $keep -eq 1 && test `expr \( $old + $block - 1 \) / $block` -lt \
`expr \( $new + $block - 1 \) / $block`; then
if test $pipe -eq 1; then
rm -f "$n$ext"
elif test $check -eq 1; then
mv "$n.$$" "$n.gz" && rm -f "$n$ext"
else
xz -d "$n$ext" && gzip "$n" && rm -f "$n$ext"
fi
echo "$n.gz smaller than $n$ext -- unchanged"
elif test $check -eq 1; then
if xz -t "$n$ext" ; then
rm -f "$n.$$" "$n.gz"
else
test $pipe -eq 0 && mv "$n.$$" "$n.gz"
rm -f "$n$ext"
echo error while testing $n$ext, $n.gz unchanged
res=1; continue
fi
elif test $pipe -eq 1; then
rm -f "$n.gz"
fi
done
exit $res