#!/bin/bash
# Copyright 1999-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: /var/cvsroot/gentoo-src/portage/bin/Attic/emerge-webrsync,v 1.8.2.4 2005/02/26 11:22:38 carpaski Exp $
# Author: Karl Trygve Kalleberg <karltk@gentoo.org>
# Rewritten from the old, Perl-based emerge-webrsync script

GENTOO_MIRRORS="${GENTOO_MIRRORS} $(/usr/lib/portage/bin/portageq gentoo_mirrors)"
PORTDIR="$(/usr/lib/portage/bin/portageq portdir)"
FETCHCOMMAND="$(/usr/lib/portage/bin/portageq envvar FETCHCOMMAND)"
USERLAND="$(/usr/lib/portage/bin/portageq envvar USERLAND)"
DISTDIR="$(/usr/lib/portage/bin/portageq envvar PORTAGE_TMPDIR)/emerge-webrsync"

if [ ! -d $DISTDIR ] ; then
	mkdir -p $DISTDIR
fi

cd "$DISTDIR"

found=0
if [ "$1" == "-v" ] ; then
	wgetops=
else	
	#this sucks.  probably better to do 1> /dev/null
	#that said, waiting on the refactoring.
	if [ "${FETCHCOMMAND/wget}" != "${FETCHCOMMAND}" ]; then
		wgetops="-q"
	elif [ "${FETCHCOMMAND/curl}" != "${FETCHCOMMAND}" ]; then
		wgetops="-s -f"
	fi
fi

if type -p md5sum > /dev/null; then
	md5_com='md5sum -c "${FILE}.md5sum"'
elif type -p md5 > /dev/null; then
	md5_com='[ "$(md5 -q ${FILE})" == "$(cut -d \  -f 1 ${FILE}.md5sum)" ]'
else
	echo "warning, unable to do md5 verification of the snapshot!"
	echo "no suitable md5/md5sum binary was found!"
	md5_com='true'
fi

sync_local() {
	echo Syncing local tree...
	if ! tar jxf $FILE; then
		echo "Tar failed to extract the image. Please review the output."
		echo "Executed command: tar jxf $FILE"
		exit 1
	fi
	rm -f $FILE
	# Make sure user and group file ownership is root
	chown -R 0:0 portage
	cd portage
	rsync -av --progress --stats --delete --delete-after \
	--exclude='/distfiles' --exclude='/packages' \
	--exclude='/local' . ${PORTDIR%%/}
	cd ..
	echo "cleaning up"
	rm -rf portage
	echo "transferring metadata/cache"
	emerge metadata
}

echo "Fetching most recent snapshot"

declare -i attempts=-1
while (( $attempts <  40 )) ; do
	attempts=$(( attempts + 1 ))

	#this too, sucks.  it works in the interim though.
	if [ "$USERLAND" == "BSD" ] || [ "$USERLAND" == "Darwin" ] ; then
		daysbefore=$(expr $(date +"%s") - 86400 \* $attempts)
		day=$(date -r $daysbefore +"%d")
		month=$(date -r $daysbefore +"%m")
		year=$(date -r $daysbefore +"%Y")
	else
		day=$(date -d "-$attempts day" +"%d")
		month=$(date -d "-$attempts day" +"%m")
		year=$(date -d "-$attempts day" +"%Y")
	fi

	FILE_ORIG="portage-${year}${month}${day}.tar.bz2"

	echo "Attempting to fetch file dated: ${year}${month}${day}"
		
	got_md5=0

	if [  ! -e "${FILE_ORIG}.md5sum" ]; then
		FILE="${FILE_ORIG}.md5sum"
		for i in $GENTOO_MIRRORS ; do 
			URI="${i}/snapshots/${FILE}"
			if (eval "$FETCHCOMMAND $wgetops") && [ -s "${FILE}" ]; then
				got_md5=1
				break
			fi
		done
	else
		got_md5=1
	fi
	FILE="${FILE_ORIG}"

	if (($got_md5 == 0 )); then
		echo " --- No md5sum present on the mirror. (Not yet available.)"
		continue
	elif [ -s "${FILE}" ]; then
		if eval "$md5_com"; then
			echo " === snapshot $FILE is correct, using it"
			sync_local
			echo
			echo " === Snapshot has beed sync'd"
			echo
			exit 0
		else
			rm $FILE
		fi
	fi
	
	for i in $GENTOO_MIRRORS ; do
		URI="${i}/snapshots/$FILE"
		rm -f "$FILE"
		if (eval "$FETCHCOMMAND $wgetops") && [ -s "$FILE" ]; then
			if ! eval "$md5_com"; then
				echo "md5 failed on $FILE"
				rm ${FILE}
				continue
			else
				sync_local
				echo
				echo " *** Completed websync, please now perform a normal rsync if possible."
				echo "     Update is current as of the of YYYYMMDD: ${year}${month}${day}"
				echo
				exit 0
			fi
		fi

	done
done

rm -rf portage

exit 1