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#!/bin/bash
# 
#   gensync
#  
#   Copyright (c) 2002-2006 by 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 "gensync $myver"
  echo "usage: $0 <root> <destfile> [package_directory]"
  echo
  echo "gensync will generate a sync database by reading all PKGBUILD files"
  echo "from <root>.  gensync builds the database in a temporary directory"
  echo "and then compresses it to <destfile>."
  echo
  echo "gensync will calculate md5sums of packages in the same directory as"
  echo "<destfile>, unless an alternate [package_directory] is specified."
  echo
  echo "note: The <destfile> name is important.  It must be of the form"
  echo "      {treename}.db.tar.gz where {treename} is the name of the custom"
  echo "      package repository you configured in /etc/pacman.conf.  The"
  echo "      generated database must reside in the same directory as your"
  echo "      custom packages (also configured in /etc/pacman.conf)"
  echo
  echo "example:  gensync /var/abs/local /home/mypkgs/custom.db.tar.gz"
  echo
  echo
  exit 0
}

source /etc/makepkg.conf

die() {
  echo "gensync: $*" >&2
  rm -rf $gstmpdir
  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 [ -f $pkgfile ]; then
    md5line=`md5sum $pkgfile`
    [ ! -z "$md5line" ] && pkgmd5sum=${md5line%  *}
    echo $pkgmd5sum
  fi
  return 0
}

get_sha1checksum()
{
  if [ -f $pkgfile ]; then
    sha1line=`sha1sum $pkgfile`
    [ ! -z "$sha1line" ] && pkgsha1sum=${sha1line% *}
    echo $pkgsha1sum
  fi
  return 0
}

db_write_entry()
{
  if [ "$pkgdir" != "" ]; then
    pkgfile="$pkgdir/$pkgname-$pkgver-$pkgrel-$CARCH.$PKGEXT"
  else
    pkgfile="$destdir/$pkgname-$pkgver-$pkgrel-$CARCH.$PKGEXT"
  fi
  if [ ! -f $pkgfile ]; then
    die "Package '$pkgfile' not found"
  fi

  csize=$(du -b $pkgfile | cut -f1)
  usize=$(LANG= LC_ALL= pacman -Qi -p $pkgfile 2>/dev/null|grep ^Size|sed 's/.*: \(.*\)/\1/')

  pkgmd5sum=`get_md5checksum $pkgfile`
  [ -z $pkgmd5sum ] && die "error generating checksum for $pkgfile"

  unset pkgname pkgver pkgrel pkgdesc force
  unset groups replaces provides depends conflicts options
  source $1 || return 1
  cd $gstmpdir
  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
  if [ -n "$pkgdesc" ]; then
    echo "%DESC%" >>desc
    echo "$pkgdesc" >>desc
    echo "" >>desc
  fi
  if [ ${#groups[*]} -gt 0 ]; then
    echo "%GROUPS%" >>desc
    for it in "${groups[@]}"; do
      echo "$it" >>desc
    done
    echo "" >>desc
  fi
  echo "%ARCH%" >>desc
  echo "$arch" >>desc
  echo "" >>desc
  if [ -n $csize ]; then
    echo "%CSIZE%" >>desc
    echo "$csize" >>desc
    echo "" >>desc
  fi
  if [ -n $usize ]; then
    echo "%USIZE%" >>desc
    echo "$usize" >>desc
    echo "" >>desc
  fi
  if [ ! -z $pkgmd5sum ]; then
    echo "%MD5SUM%" >>desc
    echo "$pkgmd5sum" >>desc
    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
  # preserve the modification time
  touch -r $1 desc depends
}

if [ $# -lt 2 ]; then
  usage
  exit 1
fi

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

d=`dirname $1`
rootdir=`cd $d && pwd`/`basename $1`
d=`dirname $2`
destdir=`cd $d && pwd`
destfile="$destdir/`basename $2`"
pkgdir=
if [ "$3" != "" ]; then
  pkgdir=$3
fi
gstmpdir=$(mktemp -d /tmp/gensync.XXXXXXXXXX) || exit 1

[ ! -d $rootdir ] && die "invalid root dir: $rootdir"
echo "gensync: building database entries, generating md5sums..." >&2
cd `dirname $2`
for file in `find $rootdir/* -name PKGBUILD`; do
  source $file || die "errors parsing $file"
  db_write_entry $file || die "error writing entry for $file"
else
  echo "gensync: missing package: $pkgfile" >&2
fi
done

echo "gensync: compressing to $destfile..." >&2
cd $gstmpdir
tar c * | gzip -9 >$destfile
[ $? -gt 0 ] && die "error writing to $destfile"

rm -rf $gstmpdir
exit 0

# vim: set ts=2 sw=2 noet: