#! /bin/sh

# $Id$
#*********************************************************************
#
# ftar -- extract tar files using FAI classes
#
# This script is part of FAI (Fully Automatic Installation)
# Copyright (C) 2001 Thomas Lange, lange@informatik.uni-koeln.de
# Universitaet zu Koeln
#
#*********************************************************************
# 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.
# 
# A copy of the GNU General Public License is available as
# '/usr/share/common-licences/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at http://www.gnu.org/copyleft/gpl.html.  You
# can also obtain it by writing to the Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#*********************************************************************

version="Version 1.3 09-Apr-2001"

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
die() {
    echo "ftar died: $1"
    exit 99
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
extract() {

    file=$1
    option=$2

    echo "ftar: extracting $file to $target/$dir"
    tar -C $target/$dir $vflag $option -xf $file
    tardone=1
    # if option -1 is set, only one class will be used
    $single && exit 0
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
usage() {

    cat <<EOF
ftar, extract tar files using classes. $version

   Copyright (C) 2001 by Thomas Lange

Usage: ftar [OPTION] ... SOURCE

   -1                   Use only first tar file matching class name.
   -c class[class]      Define classes (space separated).
   -d                   Delete all files in target before extracting.
   -D                   Create debug output.
   -h                   Show summary of options.
   -r                   Recursively remove files in target before extracting.
   -s source_dir        Look for source files relative to source_dir.
   -t target_dir        Extract files relativ to target_dir.
   -v                   Be verbose. Not yet used.

Report bugs to <lange@informatik.uni-koeln.de>.
EOF
    exit 0
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

source=$FAI_FILES
target=$FAI_ROOT
deletefiles=0
removedir=0
tardone=0

while getopts 1hDdrvs:t:c: opt ; do
        case "$opt" in
        d) deletefiles=1 ;;
        D) debug=1 ;;
        r) removedir=1 ;;
#        v) verbose=1 ;;
        1) single=1 ;;
        s) source=$OPTARG ;;
        t) target=$OPTARG ;;
        c) classes=$OPTARG ;;
        h) usage ;;
	esac
done
shift $(($OPTIND - 1))

[ "$1" ] || usage
[ -f /tmp/FAI_CLASSES ] && classes=`cat /tmp/FAI_CLASSES`
# last class has highest priority
$classes=`echo $classes | rev`
[ "$debug" ] && vflag="-v"
[ "$debug" ] && echo "ftar: classes : $classes"
[ -z "$source" ] && die "Source directory undefined."
[ -z "$target" ] && die "Target directory undefined."

# currently only one directory is used
dir=$1
fpath=$source/$dir
[ -d $fpath ] || die "no directory $fpath"

[ $deletefiles -eq 1 ] && cd $target/$dir ; rm -f  .* * 2>/dev/null
[ $removedir -eq 1 ]   && cd $target/$dir ; rm -rf .* * 2>/dev/null

for c in $classes ; do
    # what if a directory exists, which is equal to the hostname or a classname ?
    # [ -f $fpath/$c ]          && extract $fpath/$c
    [ -f $fpath/$c.tar ]      && extract $fpath/$c.tar
    [ -f $fpath/$c.tar.gz ]   && extract $fpath/$c.tar.gz -z
    [ -f $fpath/$c.tar.bz2 ]  && extract $fpath/$c.tar.bz2 -I
done

[ $tardone -eq 0 ] && echo "No matching class found in $fpath"
exit 0