diff --git a/pack_maker.sh b/pack_maker.sh
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+#!/bin/bash -e
+# usage:
+#	pack_maker.sh <to version> <back_count>
+#	pack_maker.sh 2820 2
+#	pack_maker.sh 2730 3
+#
+# For each bundle changed as of the Manifest.MoM at the <to version>,
+# create version-pair packs going back <back_count>
+# versions of that bundle.  For example if bundle "editors" changed in 2650
+# and the script is run as "pack_maker.sh 2650 2", it will find that
+# "editors" last two change points were 2550 and 2260 and thus create a
+# 2550-to-2650 and a 2260-to-2650 version pair pack for the "editors"
+# bundle.
+
+#NOTE: fullfiles must be created before calling this script
+#NOTE: zero packs need similarly created
+
+#NOTE: build numbers are sparse, search back for the next oldest existing build
+#NOTE: in the future isn't simply -10, and when that change happens we must also
+#      consider which version-pair packs are meaningful for intermediate builds
+#      and revert builds.
+
+SWUPDREPO=${SWUPDREPO:-"/usr/src/clear-projects/swupd-server"}
+BUNDLEREPO=${BUNDLEREPO:-"/usr/src/clear-projects/clr-bundles"}
+UPDATEDIR=${UPDATEDIR:-"/var/lib/update"}
+SWUPDWEBDIR="${UPDATEDIR}/www"
+SWUPD_CERTS_DIR=${SWUPD_CERTS_DIR=:-"/root/swupd-certs"}
+
+export XZ_DEFAULTS="--threads 0"
+
+export SWUPD_CERTS_DIR
+export LEAF_KEY="leaf.key.pem"
+export LEAF_CERT="leaf.cert.pem"
+export CA_CHAIN_CERT="ca-chain.cert.pem"
+export PASSPHRASE="${SWUPD_CERTS_DIR}/passphrase"
+
+VER=$1
+BACK_COUNT=$2
+
+if [ "${BACK_COUNT}" == "" ]; then
+	echo "missing to pack count"
+	exit 1
+fi
+
+if [ "${VER}" == "" ]; then
+	echo "missing to version"
+	exit 1
+fi
+
+MOM=${SWUPDWEBDIR}/${VER}/Manifest.MoM
+if [ ! -e ${MOM} ]; then
+	echo "invalid version (no ${MOM})"
+	exit 1
+fi
+
+#time ${SWUPDREPO}/swupd_make_fullfiles --statedir ${UPDATEDIR} ${VER}
+
+BUNDLE_LIST=$(cat ${MOM} | awk -v V=${VER} '$1 ~ /^M\./ && $3 == V { print $4 }')
+
+# build packs for all bundles changed in $VER
+for BUNDLE in $BUNDLE_LIST; do
+	#${SWUPDREPO}/swupd_make_pack --statedir ${UPDATEDIR} 0 ${VER} ${BUNDLE} &
+
+	BUNDLE_VER_LIST=""
+	MANIFEST_VER=$(cat ${SWUPDWEBDIR}/$VER/Manifest.MoM | grep "^previous:" | cut -f 2)
+	BUNDLE_VER=""
+	COUNT=0
+	while [ $COUNT -lt $BACK_COUNT ] && [ $MANIFEST_VER -gt 0 ]; do
+		MOM=${SWUPDWEBDIR}/$MANIFEST_VER/Manifest.MoM
+		if [ -e ${MOM} ]; then
+			BUNDLE_VER=$(cat ${MOM} | grep "	${BUNDLE}$" | cut -f 3)
+			if [ "$BUNDLE_VER" != "" ]; then
+				BUNDLE_VER_LIST="$BUNDLE_VER $BUNDLE_VER_LIST"
+				MANIFEST_VER=$(cat ${SWUPDWEBDIR}/$BUNDLE_VER/Manifest.MoM | grep "^previous:" | cut -f 2)
+				let COUNT=$((COUNT+1))
+			else
+				# back in history to where bundle didn't exist yet
+				MANIFEST_VER=0
+			fi
+		else
+			# seek backwards until a manifest if found
+			MANIFEST_VER=$((MANIFEST_VER-10))
+		fi
+	done
+
+	for v in $BUNDLE_VER_LIST; do
+		if [ -e ${SWUPDWEBDIR}/${VER}/pack-${BUNDLE}-from-$v.tar ]; then
+			echo "${VER}/pack-${BUNDLE}-from-$v.tar already exists, skipping."
+		else
+			${SWUPDREPO}/swupd_make_pack --statedir ${UPDATEDIR} $v ${VER} ${BUNDLE} &
+		fi
+	done
+done
+
+for job in $(jobs -p)
+do
+	wait ${job}
+	RET=$?
+	if [ "$RET" != "0" ]; then
+		echo "pack creation failure!"
+		exit $RET
+	fi
+done
+
+# NOTE: your devops will want to expose the completed swupd server build to
+# trial usage at some point.  This would be done via code like:
+#
+#	echo ${VER} > ${SWUPDWEBDIR}/../image/latest.version
+#	STAGING=$(cat ${SWUPDWEBDIR}/version/formatstaging/latest)
+#	if [ "${STAGING}" -lt "${VER}" ]; then
+#		echo ${VER} > ${SWUPDWEBDIR}/version/formatstaging/latest
+#	fi