--- /usr/sbin/emerge-webrsync	2005-01-31 13:49:44.000000000 +1300
+++ ./emerge-webrsync	2005-01-31 13:52:32.923718040 +1300
@@ -4,6 +4,53 @@
 # $Header: /var/cvsroot/gentoo-src/portage/bin/Attic/emerge-webrsync,v 1.8.2.3 2005/01/17 16:38:22 jstubbs Exp $
 # Author: Karl Trygve Kalleberg <karltk@gentoo.org>
 # Rewritten from the old, Perl-based emerge-webrsync script
+# Snapshot date verification etc added by James Roberts-Thomson
+
+showhelp() {
+	echo "Usage: $0 [-v] [-n|-N], where:"
+	echo "          -v indicates verbose wgets"
+	echo "          -n prevents downloading, just looks for previously downloaded snapshot"
+	exit 1
+}
+
+invalid_parameter() {
+	echo "Error: \"${_cmd_options}\" is not a valid parameter."
+	echo ""
+	showhelp
+}
+
+store_date() {
+	if [ ! -d "/var/lib/portage" ]; then mkdir -p /var/lib/portage; fi
+	echo $1 > /var/lib/portage/webrsync-date
+}
+
+check_date() {
+	if [ -f "/var/lib/portage/webrsync-date" ]; then
+		if [ "$1" == "`cat /var/lib/portage/webrsync-date`" ]; then
+			exit 1
+		else
+			exit 0
+		fi
+	else
+		exit 0
+	fi 
+}
+
+found=0
+attempts=0
+download=1
+_optv=0
+_optn=0
+
+# Iterate through any command-line options (if supplied), and set appropriate variables
+for _cmd_options do
+	case "${_cmd_options}" in
+	-v) _optv=1 ;;
+	-n) _optn=1 ;;
+	-\?|-h|-H) showhelp;;
+	*) invalid_parameter;;
+	esac
+done
 
 GENTOO_MIRRORS="${GENTOO_MIRRORS} $(/usr/lib/portage/bin/portageq gentoo_mirrors)"
 PORTDIR="$(/usr/lib/portage/bin/portageq portdir)"
@@ -17,8 +64,7 @@ fi
 
 cd "$DISTDIR"
 
-found=0
-if [ "$1" == "-v" ] ; then
+if [ "${_optv}" = "1" ] ; then
 	wgetops=
 else	
 	#this sucks.  probably better to do 1> /dev/null
@@ -30,6 +76,10 @@ else	
 	fi
 fi
 
+if [ "${_optn}" = "1" ] ; then
+	download=0
+fi
+
 if type -p md5sum > /dev/null; then
 	md5_com='md5sum -c "${FILE}.md5sum"'
 elif type -p md5 > /dev/null; then
@@ -48,6 +98,7 @@ sync_local() {
 		exit 1
 	fi
 	rm -f $FILE
+	rm -f ${FILE}.md5sum
 	# Make sure user and group file ownership is root
 	chown -R 0:0 portage
 	cd portage
@@ -61,7 +112,28 @@ sync_local() {
 	emerge metadata
 }
 
-echo "Fetching most recent snapshot"
+get_md5file() {
+	if [  ! -s "${FILE_ORIG}.md5sum" ]; then
+		FILE_ORIG="${FILE}"
+		FILE="${FILE}.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 [ $download == 1 ]; then
+	echo "Fetching most recent snapshot"
+else
+	echo "Using most recently downloaded snapshot"
+fi
 
 declare -i attempts=-1
 while (( $attempts <  40 )) ; do
@@ -79,61 +151,68 @@ while (( $attempts <  40 )) ; do
 		year=$(date -d "-$attempts day" +"%Y")
 	fi
 
-	FILE_ORIG="portage-${year}${month}${day}.tar.bz2"
+	if (check_date ${year}${month}${day})
+	then
+		FILE="portage-${year}${month}${day}.tar.bz2"
 
-	echo "Attempting to fetch file dated: ${year}${month}${day}"
-		
-	got_md5=0
+		[ "$_optn" == "0" ] && echo "Attempting to fetch file dated: ${year}${month}${day}"
 
-	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
+		got_md5=0
+
+		if [ "$download" = "1" ]
+		then
+			get_md5file
+
+			if (($got_md5 == 0 )); then
+				echo " --- No md5sum present on the mirror. (Not yet available.)"
+				continue
 			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
+			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}
+						rm ${FILE}.md5sum
+						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
 		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}${day}"
-				echo
-				exit 0
+			if [ -s "${FILE}" ]
+			then
+				echo " === found snapshot $FILE"
+				if [ ! -s "${FILE}.md5sum" ]; then
+					echo " === no MD5 checksum, trying to fetch one"
+					get_md5file
+				fi
+				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
+					echo " === unable to verify snapshot $FILE, removing it"
+					rm $FILE
+					rm -f ${FILE}.md5sum
+				fi
 			fi
 		fi
-
-	done
+	else
+		echo "Earlier snapshot date reached - aborting"
+		attempts=999
+	fi
 done
 
 rm -rf portage