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#!/bin/bash
# 
#   updatesync-many
#  
#   Copyright (c) 2004-2006 by Jason Chu and Judd Vinet
#   Contact: <jason@archlinux.org> and <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.
#

usage() {
	echo "updatesync-many"
	echo "usage: $0 <action> <dbfile> <svn_checkout> <repo_tag>"
	echo
	echo "This should probably only be run from the Arch db-generation scripts"
	echo
	echo "Caveats:"
	echo " - Make sure you run it from the staging directory"
	echo " - Use absolute pathnames for dbfile and svn_checkout"
	echo
	exit 0
}

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

msg()
{
	echo "updatesync-many: $*" >&2
}

# Get the package name from the filename
# hackish, but should work for now
getpkgname() {
  local tmp

  tmp=${1##*/}
  tmp=${tmp%.pkg.tar.gz}
  tmp=${tmp%-i686}
  tmp=${tmp%-x86_64}
  echo ${tmp%-*-*}
}

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()
{
	md5line=`md5sum $1`
	[ ! -z "$md5line" ] && pkgmd5sum=${md5line%  *}
	echo $pkgmd5sum
}

db_write_entry()
{
	unset pkgname pkgver pkgrel pkgdesc license groups provides md5sums force
	unset replaces depends conflicts backup source install build makedepends
	unset options
	source $1 || return 1
	cd $TMPDIR
	mkdir $pkgname-$pkgver-$pkgrel || return 1
	cd $pkgname-$pkgver-$pkgrel
	# desc
	: >desc
	echo "%FILENAME%" >>desc
	echo "$2" >>desc
	echo "" >>desc
	echo "%NAME%" >>desc
	echo "$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()
{
	# grab the pkgname
	pkgname=$(getpkgname $1)
	for i in *; do
		if [ "${i%-*-*}" = "$pkgname" ]; then
			rm -rf $i
		fi
	done
}

update_entry()
{
	pkgfile=$1
	pkgname=$(getpkgname ${pkgfile})
	fullname=$(basename ${pkgfile})
    pkgpath="$SVNCO/$pkgname/repos/$REPOTAG"

	# find the matching PKGBUILD
    if [ ! -d "$pkgpath" ]; then
		msg "WARNING: could not find PKGBUILD for $pkgname, cannot update this entry"
		return
	fi
	pkgbuild="${pkgpath}/PKGBUILD"
	if [ ! -f $pkgbuild ]; then
		msg "WARNING: could not find PKGBUILD for $fullname, cannot update this entry"
		return
	fi

	source $pkgbuild
	if [ $? -ne 0 ]; then
		msg "WARNING: PKGBUILD for $fullname has errors, cannot update this entry"
		return
	fi

	# all good so far - delete the old entry
	cd $TMPDIR
	delete_entry $pkgfile

	csize=`du -b $pkgfile | cut -f1`
	pkgmd5sum=`get_md5checksum $pkgfile`
	[ -z $pkgmd5sum ] && die "error generating checksum for $pkgfile"

	db_write_entry ${pkgbuild} ${fullname} || die "error writing entry for $pkgname"
	cd - >/dev/null
}

if [ ! "`type -p lsof`" ]; then
	echo "ERROR: lsof is needed to run updatesync-many!"
	exit 1
fi

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

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

ACTION=$1
PKGDB=$2
SVNCO=$3
REPOTAG=$4
STAGEDIR="`pwd`"
PKGDIR="`dirname $PKGDB`"
if [ "$PKGDIR" = "." ]; then
	PKGDIR=$STAGEDIR
fi

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

# Prepare the sync db for modifications
TMPDIR=$(mktemp -d /tmp/updatesync-many.XXXXXXXXXX) || exit 1
cd $TMPDIR
if [ ! -f $PKGDB ]; then
	die "$PKGDB not found"
fi
msg "Unpacking db: $PKGDB"
tar zxf $PKGDB || die "error unpacking $PKGDB"

# Process packages in the staging directory
for pkgfile in $STAGEDIR/*.pkg.tar.gz; do
	# Make sure this file isn't currently in use by any processes...
	# This is our cheap way of (mostly) making sure the file isn't being
	# uploaded at this very time (and thus incomplete).
	# Of course, if an upload failed and the scp connection terminated, then
	# this check will fail us.
	lsof $pkgfile &>/dev/null
	[ $? -ne 1 ] && continue

	pkgname=$(getpkgname ${pkgfile})
	if [ "$ACTION" = "del" ]; then
		msg "Deleting entry: $pkgname"
		delete_entry $pkgfile
	else
		msg "Updating entry: $pkgname"
		update_entry $pkgfile
	fi
done

# Repackage the DB
msg "Repacking db: $PKGDB"
cd $TMPDIR
tar c * | gzip -9 >$PKGDB || die "error writing to $PKGDB"

cd /
rm -rf $TMPDIR

exit 0