#!/bin/sh
# bzme re-compress gzip, zip, ... files into bzip2
#==============================================================================
# Copyright (C) 1999-2002 MandrakeSoft (tvignaud@mandrakesoft.com)
# By Thierry Vignaud <tvignaud@mandrakesoft.com>
#
# 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# The GNU General Public License can be read at
# http://www.fsf.org/copyleft/gpl.html
#==============================================================================
#
# Know bugs:
# ----------
# - bash getopt isn't gnu style aware, ie cmd opt1 file1 file2 opt2
# will result in ignoring opt2 option
#
#==============================================================================
#
# Changelog:
# ----------
# v1.0: original release
# v1.1: fix space usage (use pipe rather than temp file)
# v1.2: keep source file, not bz2 one if eof while decompressing
# v1.3: reduce used cpu time (decompressing only one time;
# source crc error 're detected through PIPESTATUS)
# v1.4: add zip support on popular^h^h^h^h^hGwenole request
# v1.5:
# - make zip method acting as z one (remove original file,
# keeping only smallest file, displaying size gain, ...)
# thus giving occasion to factorize some common code
# - check that the source file does exists
# - handle corrupted zip source file
# - comment the script and verbos-ize() some old changes
# - use cheaper shell tests
# - add GPL reference
# - update online help to reflect optional options and newer
# supported formats
# - remove dependency on sed by using ${1%old}new_extension
# v1.6:
# - print error message on stderr rather than on stdin
# - factorize/simplify zip method (fix erase temp files on bzip2ing
# error)
# - typo fixes
# - simplify for_each(file) loop
# - add "Know bugs" and TODO sections
# - add -h and -k options
# - if -k (keep) option is used, keep all files
# v1.7: - handle file names with spaces
# v1.8:
# - able to recompress rar files too
# - adapt for Fedora/RHEL
#==============================================================================
#
#
# TODO:
# - retrieve my patch for solaris file utils
# - add trap for zip method (is it really useful?)
# - add a man page
# - move bzme in its own package that requires tar too
# Defaults
force=
keep=
# Corrupted source error message
src_err_msg ()
{ if [ "$2" != 0 ]; then
echo "Corrupted source file ($1) !" 1>&2
rm -f "$TARGET"
STATUS=1
fi
}
gz_compr ()
{ zcat "$1" | bzip2 -9 > "$TARGET"
# Keep PIPESTATUS
MY_STATUS=( ${PIPESTATUS[*]} )
src_err_msg "$1" ${MY_STATUS[0]}
if [[ "${MY_STATUS[1]}" != "0" ]]; then
echo "error while bziping !" 1>&2
STATUS=1
fi
}
create_temp_dir ()
{
[[ -z "$TMPDIR" ]] && TMPDIR=$TMP
[[ -z "$TMPDIR" ]] && TMPDIR=~/tmp
MY_TMP=$(mktemp -d $TMPDIR/gzme.XXXXXX)
}
rar_compr ()
{
create_temp_dir
(cd $MY_TMP; unrar x "$OLDPWD/$1") > /dev/null
src_err_msg "$1" $?
tar cfj "$TARGET" -C $MY_TMP .
if [[ $? != 0 ]]; then
echo "error while taring !" 1>&2
STATUS=1
fi
# Removing temporary files
rm -fr $MY_TMP
}
zip_compr ()
{
create_temp_dir
unzip -qd $MY_TMP "$1"
src_err_msg "$1" $?
tar cfj "$TARGET" -C $MY_TMP .
if [[ $? != 0 ]]; then
echo "error while taring !" 1>&2
STATUS=1
fi
# Removing temporary files
rm -fr $MY_TMP
}
compress ()
{ echo -n "Compressing $1 ... "
if [[ ! -f "$1" ]]; then
echo "Source file doesn't exist" 1>&2
return
fi
STATUS=0
SIZE=$(du "$1"|cut -f 1 -d " ")
SIZE_o=$(du -b "$1"|cut -f 1 -d " ")
if [[ -f "$TARGET" ]]; then
if [[ -n $force ]];then
rm -f "$TARGET"
else
echo "$TARGET already exists !!" 1>&2
echo "Use -f to force it"
return
fi
fi
# Do the real compression job
$METHOD "$1"
# if there was an error
if [[ $STATUS = 1 ]]; then
[[ -z $keep ]] && rm -f "$TARGET"
return
fi
# Compare size in order to only keep the smallest file
SIZE2=$(du "$TARGET"|cut -f 1 -d " ")
SIZE2_o=$(du -b "$TARGET"|cut -f 1 -d " ")
if [[ $SIZE_o -lt $SIZE2_o && -z $force_compress ]]
then
echo "=> $TARGET is bigger than $1 ($SIZE"kb" => $SIZE2"kb") !!!"
echo "Use -F to force the recompression"
[[ -z $keep ]] && rm -f "$TARGET"
else
echo "=> $TARGET ($SIZE"kb" => $SIZE2"kb")"
[[ -z $keep ]] && rm -f "$1"
fi
}
while getopts Ffhk opt; do
case "$opt" in
F) force_compress="yes";;
f) force="yes";;
k) keep="yes";;
h)
echo "Usage: bzme [-Ffhk] file.*.({,t}gz|Z|zip)"
exit 1;;
*)
echo "See bzme -h for usage"
exit 1;;
esac
done
shift $((OPTIND - 1))
echo keeping: $keep
while [[ "$1" != "" ]]
do
#default method is gz,.Z,.z,..
METHOD=gz_compr
case "$1" in
*.bz2) echo "$1: already compressed!"; shift;continue;;
*.tgz) TARGET=${1%.tgz}.tar.bz2;;
*.Z) TARGET=${1%.Z}.bz2;;
*.gz) TARGET=${1%.gz}.bz2;;
*.rar)
METHOD=rar_compr
TARGET=${1%.rar}.bz2
;;
*.zip)
METHOD=zip_compr
TARGET=${1%.zip}.tar.bz2
;;
*) echo "$1: unknown file extension => ignored"; shift; continue;;
esac
compress "$1"
shift
done
