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#!/bin/bash
# 
#   updatesync
#  
#   Copyright (c) 2004 by Jason Chu <jason@archlinux.org>
#   Derived from gensync (c) 2002-2006 Judd Vinet <jvinet@zeroflux.org>
#  
#   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
#   USA.
#

myver='2.9.8'

usage() {
        echo "updatesync $myver"
        echo "usage: $0 <action> <destfile> <option> [package_directory]"
        echo
        echo "updatesync will update a sync database by reading a PKGBUILD and"
        echo "modifying the destfile. updatesync updates the database in a temporary"
        echo "directory and then compresses it to <destfile>."
        echo
        echo "There are two types of actions:"
        echo
        echo "upd - Will update a package's entry or create it if it doesn't exist."
        echo "      It takes the package's PKGBUILD as an option."
        echo "del - Will remove a package's entry from the db."
        echo "      It takes the package's name as an option."
        echo
        echo "updatesync will calculate md5sums of packages in the same directory as"
        echo "<destfile>, unless an alternate [package_directory] is specified."
        echo
        echo "example:  updatesync upd /home/mypkgs/custom.db.tar.gz PKGBUILD"
        echo
        echo
        exit 0
}

die()
{
        echo "updatesync: $*" >&2
        rm -rf $ustmpdir
        exit 1
}

check_option() {
        local i
        for i in ${options[@]}; do
                local uc=`echo $i | tr [:lower:] [:upper:]`
                local lc=`echo $i | tr [:upper:] [:lower:]`
                if [ "$uc" = "$1" -o "$lc" = "$1" ]; then
                        echo $1
                        return
                fi
        done
}

get_md5checksum()
{
        if [ "$pkgdir" != "" ]; then
                pkgfile="$pkgdir/$pkgname-$pkgver-$pkgrel.pkg.tar.gz"
        else
                pkgfile="$destdir/$pkgname-$pkgver-$pkgrel.pkg.tar.gz"
        fi
        if [ -f $pkgfile ]; then
                md5line=`md5sum $pkgfile`
                [ ! -z "$md5line" ] && pkgmd5sum=${md5line%  *}
                echo $pkgmd5sum
        fi
        return 0
}

db_write_entry()
{
        unset pkgname pkgver pkgrel pkgdesc force
        unset groups replaces provides depends conflicts options
        source $1 || return 1
        cd $ustmpdir
        mkdir $pkgname-$pkgver-$pkgrel || return 1
        cd $pkgname-$pkgver-$pkgrel
        # desc
        : >desc
        echo "%NAME%" >>desc
        echo "$pkgname" >>desc
        echo "" >>desc
        echo "%VERSION%" >>desc
        echo "$pkgver-$pkgrel" >>desc
        echo "" >>desc
        echo "%DESC%" >>desc
        echo "$pkgdesc" >>desc
        echo "" >>desc
        echo "%CSIZE%" >>desc
        echo "$csize" >>desc
        echo "" >>desc
        if [ ! -z $pkgmd5sum ]; then
                echo "%MD5SUM%" >>desc
                echo "$pkgmd5sum" >>desc
                echo "" >>desc
        fi
        if [ ${#groups[*]} -gt 0 ]; then
                echo "%GROUPS%" >>desc
                for it in "${groups[@]}"; do
                        echo "$it" >>desc
                done
                echo "" >>desc
        fi
        if [ ${#replaces[*]} -gt 0 ]; then
                echo "%REPLACES%" >>desc
                for it in "${replaces[@]}"; do
                        echo "$it" >>desc
                done
                echo "" >>desc
        fi
        if [ "$force" = "y" -o "$force" = "Y" -o "`check_option FORCE`" ]; then
                echo "%FORCE%" >>desc
                echo "" >>desc
        fi
        # depends
        : >depends
        if [ ${#depends[*]} -gt 0 ]; then
                echo "%DEPENDS%" >>depends
                for it in "${depends[@]}"; do
                  echo "$it" >>depends
                done
                echo "" >>depends
        fi
        if [ ${#conflicts[*]} -gt 0 ]; then
                echo "%CONFLICTS%" >>depends
                for it in "${conflicts[@]}"; do
                  echo "$it" >>depends
                done
                echo "" >>depends
        fi
        if [ ${#provides[*]} -gt 0 ]; then
                echo "%PROVIDES%" >>depends
                for it in "${provides[@]}"; do
                  echo "$it" >>depends
                done
                echo "" >>depends
        fi
}

delete_entry()
{
        echo $1 | grep PKGBUILD 2>&1 >/dev/null
        if [ $? -eq 0 ]; then
                source $1
        else
                pkgname=$1
        fi
        for i in *; do
                if [ "${i%-*-*}" = "$pkgname" ]; then
                        echo "updatesync: deleting $i" >&2
                        rm -rf $i
                fi
        done
}

if [ $# -lt 3 ]; then
        usage
        exit 1
fi

if [ "$1" = "-h" -o "$1" = "--help" ]; then
        usage
        exit 0
fi

action=$1
pkgdb=$2
option=$3
curdir="`pwd`"
pkgdir=$curdir
if [ "$4" != "" ]; then
        pkgdir=$4
fi

if [ "$action" != "upd" -a "$action" != "del" ]; then
        usage
        exit 1
fi

ustmpdir=$(mktemp -d /tmp/updatesync.XXXXXXXXXX) || exit 1

cd $ustmpdir
if [ ! -f $pkgdb ]; then
        if [ ! -f $curdir/$pkgdb ]; then
                echo "updatesync: $pkgdb not found"
                exit 1
        fi
        pkgdb=$curdir/$pkgdb
fi

if [ "$action" = "upd" -a ! -f $option ]; then
        if [ ! -f $curdir/$option ]; then
                echo "updatesync: $option not found"
                exit 1
        fi
        option=$curdir/$option
fi

echo "updatesync: uncompressing to $ustmpdir..." >&2
tar -xzf $pkgdb || die "error uncompressing $pkgdb"
if [ "$action" = "upd" ]; then
        # INSERT / UPDATE
        delete_entry $option

        source $option || die "errors parsing $option"
        if [ "$pkgdir" != "" ]; then
                pkgfile="$pkgdir/$pkgname-$pkgver-$pkgrel.pkg.tar.gz"
        else
                pkgfile="$destdir/$pkgname-$pkgver-$pkgrel.pkg.tar.gz"
        fi
        if [ -f $pkgfile ]; then
                csize=`du -b $pkgfile | cut -f1`
                pkgmd5sum=`get_md5checksum $pkgfile`
                [ -z $pkgmd5sum ] && die "error generating checksum for $pkgfile"
                echo "updatesync: creating entry for $option" >&2
                db_write_entry $option || die "error writing entry for $option"
        else
                echo "updatesync: missing package: $pkgfile" >&2
        fi
else
        # DELETE
        delete_entry $option
fi

echo "updatesync: compressing to $pkgdb..." >&2
cd $ustmpdir
tar c * | gzip -9 >$pkgdb || die "error writing to $pkgdb"

cd $curdir
rm -rf $ustmpdir

exit 0